Component

Dehydroascorbic acid

Two-electron-oxidized vitamin C; DHA is chemically and transportationally distinct from reduced ascorbate.

19 recorded relationships. Experimental role, claim status and evidence remain attached to each record.

Read recorded mechanisms Open recursive mind map

How nutrients influence it

Every nutrient with a recorded effect on this component, credited to the nutrient that acted rather than the chapter that recorded it. Open a nutrient to see the findings and the conditions they were measured under.

How nutrients reach it in more than one step

Chains of two or more recorded steps that end here, grouped by the nutrient they start from. Each step is a separate finding, so a chain is a route a mechanism could take, not proof that it does.

Tracing routes…

What it does

Every recorded relationship this component is part of, grouped by its role. Plain wording comes first; the technical statement follows.

Recorded relationships

What it acts on

  1. Human erythrocytes rapidly took up supplied DHA and accumulated ascorbate to concentrations up to 2 mM in the ex vivo assay.

    Dehydroascorbic acid → L-Ascorbate source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    true
    experimental_model
    Human volunteer erythrocytes ex vivo
    exposure
    Exogenous DHA concentration series
    limitations
    Assay loading capacity is not the normal circulating erythrocyte concentration.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Homo sapiens
    plain_language
    Red cells can recover reduced vitamin C from its oxidized form.
    primary_references
    [may2001] Mechanisms of ascorbic acid recycling in human erythrocytes. (2001). https://pubmed.ncbi.nlm.nih.gov/11687303/ DOI: 10.1016/s0304-4165(01)00188-x
    tissue_or_cell_type
    Erythrocytes

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 312–323

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human volunteer erythrocytes ex vivo · source_derived_draft · unverified_draft

    ### vc-transport-rbc-dha-recycling Human erythrocytes rapidly took up supplied DHA and accumulated ascorbate to concentrations up to 2 mM in the ex vivo assay. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Red cells can recover reduced vitamin C from its oxidized form. organism: Homo sapiens tissue_or_cell_type: Erythrocytes experimental_model: Human volunteer erythrocytes ex vivo limitations: Assay loading capacity is not the normal circulating erythrocyte concentration. exposure: Exogenous DHA concentration series cross_nutrient: true [may2001] Mechanisms of ascorbic acid recycling in human erythrocytes. (2001). https://pubmed.ncbi.nlm.nih.gov/11687303/ DOI: 10.1016/s0304-4165(01)00188-x
    Complete structured claim and evidence

What acts on it

  1. Purified bovine liver protein disulfide isomerase catalyzed DHA reduction with GSH; apparent DHA Km was 1.0 mM.

    Bovine protein disulfide isomerase / P4HB → Dehydroascorbic acid source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    true
    experimental_model
    Purified human placental glutaredoxin and bovine liver PDI; additional porcine/bovine glutaredoxins
    exposure
    Purified PDI, DHA and GSH
    limitations
    Do not infer intact human endoplasmic-reticulum flux from this enzyme-capacity result.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Bos taurus
    plain_language
    A bovine protein-folding enzyme also recycled oxidized vitamin C in a purified assay.
    primary_references
    [wells1990] Mammalian thioltransferase (glutaredoxin) and protein disulfide isomerase have dehydroascorbate reductase activity. (1990). https://pubmed.ncbi.nlm.nih.gov/2394726/ DOI: 10.1016/s0021-9258(18)55401-6
    tissue_or_cell_type
    Liver enzyme preparation

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 364–375

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Purified human placental glutaredoxin and bovine liver PDI; additional porcine/bovine glutaredoxins · source_derived_draft · unverified_draft

    ### vc-transport-bovine-pdi-dha Purified bovine liver protein disulfide isomerase catalyzed DHA reduction with GSH; apparent DHA Km was 1.0 mM. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: A bovine protein-folding enzyme also recycled oxidized vitamin C in a purified assay. organism: Bos taurus tissue_or_cell_type: Liver enzyme preparation experimental_model: Purified human placental glutaredoxin and bovine liver PDI; additional porcine/bovine glutaredoxins limitations: Do not infer intact human endoplasmic-reticulum flux from this enzyme-capacity result. exposure: Purified PDI, DHA and GSH cross_nutrient: true [wells1990] Mammalian thioltransferase (glutaredoxin) and protein disulfide isomerase have dehydroascorbate reductase activity. (1990). https://pubmed.ncbi.nlm.nih.gov/2394726/ DOI: 10.1016/s0021-9258(18)55401-6
    Complete structured claim and evidence

  2. Mammalian GLUT1 expressed in Xenopus oocytes transported DHA with apparent Km 1.1 ± 0.2 mM; reduced ascorbate was not transported in the screen.

    Mammalian GLUT1 orthologs → Dehydroascorbic acid source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    experimental_model
    Mammalian GLUT cDNAs expressed in Xenopus laevis oocytes; CHO overexpression
    exposure
    Heterologous GLUT expression and DHA uptake
    limitations
    In vitro apparent kinetics; donor species unresolved, so retained as ortholog group rather than a human-specific claim.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Xenopus laevis host; mammalian clone donor not verified
    plain_language
    GLUT1 can carry oxidized vitamin C; it does not substitute directly for an ascorbate transporter.
    primary_references
    [rumsey1997] Glucose transporter isoforms GLUT1 and GLUT3 transport dehydroascorbic acid. (1997). https://pubmed.ncbi.nlm.nih.gov/9228080/ DOI: 10.1074/jbc.272.30.18982
    tissue_or_cell_type
    Oocyte membrane
    transport_effect
    raises DHA transport measured in expressing oocytes with an apparent Km of 1.1 mM.
    transport_pool
    the expressing cell DHA transport measured in expressing oocytes with an apparent Km of 1.1 mM.

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 247–258

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Mammalian GLUT cDNAs expressed in Xenopus laevis oocytes; CHO overexpression · source_derived_draft · unverified_draft

    ### vc-transport-glut1-dha Mammalian GLUT1 expressed in Xenopus oocytes transported DHA with apparent Km 1.1 ± 0.2 mM; reduced ascorbate was not transported in the screen. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: GLUT1 can carry oxidized vitamin C; it does not substitute directly for an ascorbate transporter. organism: Xenopus laevis host; mammalian clone donor not verified tissue_or_cell_type: Oocyte membrane experimental_model: Mammalian GLUT cDNAs expressed in Xenopus laevis oocytes; CHO overexpression limitations: In vitro apparent kinetics; donor species unresolved, so retained as ortholog group rather than a human-specific claim. exposure: Heterologous GLUT expression and DHA uptake cross_nutrient: false [rumsey1997] Glucose transporter isoforms GLUT1 and GLUT3 transport dehydroascorbic acid. (1997). https://pubmed.ncbi.nlm.nih.gov/9228080/ DOI: 10.1074/jbc.272.30.18982
    Complete structured claim and evidence

  3. Mammalian GLUT3 expressed in Xenopus oocytes transported DHA with apparent Km 1.7 ± 0.3 mM; reduced ascorbate was not transported in the screen.

    Mammalian GLUT3 orthologs → Dehydroascorbic acid source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    experimental_model
    Mammalian GLUT cDNAs expressed in Xenopus laevis oocytes; CHO overexpression
    exposure
    Heterologous GLUT expression and DHA uptake
    limitations
    In vitro apparent kinetics; donor species unresolved, so retained as ortholog group rather than a human-specific claim.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Xenopus laevis host; mammalian clone donor not verified
    plain_language
    GLUT3 can carry oxidized vitamin C; it does not substitute directly for an ascorbate transporter.
    primary_references
    [rumsey1997] Glucose transporter isoforms GLUT1 and GLUT3 transport dehydroascorbic acid. (1997). https://pubmed.ncbi.nlm.nih.gov/9228080/ DOI: 10.1074/jbc.272.30.18982
    tissue_or_cell_type
    Oocyte membrane
    transport_effect
    raises DHA transport measured in expressing oocytes with an apparent Km of 1.7 mM.
    transport_pool
    the expressing cell DHA transport measured in expressing oocytes with an apparent Km of 1.7 mM.

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 260–271

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Mammalian GLUT cDNAs expressed in Xenopus laevis oocytes; CHO overexpression · source_derived_draft · unverified_draft

    ### vc-transport-glut3-dha Mammalian GLUT3 expressed in Xenopus oocytes transported DHA with apparent Km 1.7 ± 0.3 mM; reduced ascorbate was not transported in the screen. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: GLUT3 can carry oxidized vitamin C; it does not substitute directly for an ascorbate transporter. organism: Xenopus laevis host; mammalian clone donor not verified tissue_or_cell_type: Oocyte membrane experimental_model: Mammalian GLUT cDNAs expressed in Xenopus laevis oocytes; CHO overexpression limitations: In vitro apparent kinetics; donor species unresolved, so retained as ortholog group rather than a human-specific claim. exposure: Heterologous GLUT expression and DHA uptake cross_nutrient: false [rumsey1997] Glucose transporter isoforms GLUT1 and GLUT3 transport dehydroascorbic acid. (1997). https://pubmed.ncbi.nlm.nih.gov/9228080/ DOI: 10.1074/jbc.272.30.18982
    Complete structured claim and evidence

  4. Purified human placental glutaredoxin catalyzed GSH-dependent reduction of DHA to ascorbate.

    Human glutaredoxin 1 / GLRX → Dehydroascorbic acid source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    true
    experimental_model
    Purified human placental glutaredoxin and bovine liver PDI; additional porcine/bovine glutaredoxins
    exposure
    Purified enzyme plus DHA and GSH
    limitations
    In vitro activity does not establish its share of total placental recycling.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Homo sapiens
    plain_language
    Glutaredoxin can use glutathione to restore reduced vitamin C.
    primary_references
    [wells1990] Mammalian thioltransferase (glutaredoxin) and protein disulfide isomerase have dehydroascorbate reductase activity. (1990). https://pubmed.ncbi.nlm.nih.gov/2394726/ DOI: 10.1016/s0021-9258(18)55401-6
    tissue_or_cell_type
    Placental enzyme preparation

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 351–362

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Purified human placental glutaredoxin and bovine liver PDI; additional porcine/bovine glutaredoxins · source_derived_draft · unverified_draft

    ### vc-transport-human-glutaredoxin-dha Purified human placental glutaredoxin catalyzed GSH-dependent reduction of DHA to ascorbate. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Glutaredoxin can use glutathione to restore reduced vitamin C. organism: Homo sapiens tissue_or_cell_type: Placental enzyme preparation experimental_model: Purified human placental glutaredoxin and bovine liver PDI; additional porcine/bovine glutaredoxins limitations: In vitro activity does not establish its share of total placental recycling. exposure: Purified enzyme plus DHA and GSH cross_nutrient: true [wells1990] Mammalian thioltransferase (glutaredoxin) and protein disulfide isomerase have dehydroascorbate reductase activity. (1990). https://pubmed.ncbi.nlm.nih.gov/2394726/ DOI: 10.1016/s0021-9258(18)55401-6
    Complete structured claim and evidence

  5. Isolated rat adipocytes transported DHA and reduced the internalized vitamin completely to ascorbate; the study identified GLUT4-mediated DHA transport.

    Rat glucose transporter 4 / Slc2a4 → Dehydroascorbic acid source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    experimental_model
    Isolated rat adipocytes and GLUT4-expressing Xenopus oocytes
    exposure
    Isolated adipocyte uptake assays
    limitations
    Intact adipocyte evidence complements heterologous GLUT4 experiments; not a clinical diabetes result.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Rattus norvegicus
    plain_language
    Rat fat cells can take up oxidized vitamin C through their insulin-sensitive glucose transport pathway.
    primary_references
    [rumsey2000] Dehydroascorbic acid transport by GLUT4 in Xenopus oocytes and isolated rat adipocytes. (2000). https://pubmed.ncbi.nlm.nih.gov/10862609/ DOI: 10.1074/jbc.m000988200
    tissue_or_cell_type
    Adipocytes

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 286–297

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Isolated rat adipocytes and GLUT4-expressing Xenopus oocytes · source_derived_draft · unverified_draft

    ### vc-transport-rat-adipocyte-glut4 Isolated rat adipocytes transported DHA and reduced the internalized vitamin completely to ascorbate; the study identified GLUT4-mediated DHA transport. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Rat fat cells can take up oxidized vitamin C through their insulin-sensitive glucose transport pathway. organism: Rattus norvegicus tissue_or_cell_type: Adipocytes experimental_model: Isolated rat adipocytes and GLUT4-expressing Xenopus oocytes limitations: Intact adipocyte evidence complements heterologous GLUT4 experiments; not a clinical diabetes result. exposure: Isolated adipocyte uptake assays cross_nutrient: false [rumsey2000] Dehydroascorbic acid transport by GLUT4 in Xenopus oocytes and isolated rat adipocytes. (2000). https://pubmed.ncbi.nlm.nih.gov/10862609/ DOI: 10.1074/jbc.m000988200
    Complete structured claim and evidence

  6. Human erythrocyte and inside-out-vesicle kinetic assays showed DHA and 3-O-methylglucose competing at both membrane faces, consistent with transport through the same GLUT1 complex.

    3-O-Methyl-D-glucose → Dehydroascorbic acid source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    true
    experimental_model
    Human erythrocytes, ghosts and inside-out membrane vesicles
    exposure
    Initial-rate substrate competition and trans-acceleration assays
    limitations
    3-O-methylglucose is a transport probe, not dietary glucose. This challenges segregated transport pools without denying vitamin C recycling.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Homo sapiens
    plain_language
    A later kinetic study found that sugar and oxidized vitamin C share the red-cell GLUT1 transport pathway.
    primary_references
    [sage2014] Human erythrocytes transport dehydroascorbic acid and sugars using the same transporter complex. (2014). https://pubmed.ncbi.nlm.nih.gov/24598365/ DOI: 10.1152/ajpcell.00044.2014
    tissue_or_cell_type
    Erythrocyte plasma membrane and inside-out vesicles

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 533–544

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human erythrocytes, ghosts and inside-out membrane vesicles · source_derived_draft · unverified_draft

    ### vc-transport-rbc-sugar-competition Human erythrocyte and inside-out-vesicle kinetic assays showed DHA and 3-O-methylglucose competing at both membrane faces, consistent with transport through the same GLUT1 complex. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: A later kinetic study found that sugar and oxidized vitamin C share the red-cell GLUT1 transport pathway. organism: Homo sapiens tissue_or_cell_type: Erythrocyte plasma membrane and inside-out vesicles experimental_model: Human erythrocytes, ghosts and inside-out membrane vesicles limitations: 3-O-methylglucose is a transport probe, not dietary glucose. This challenges segregated transport pools without denying vitamin C recycling. exposure: Initial-rate substrate competition and trans-acceleration assays cross_nutrient: true [sage2014] Human erythrocytes transport dehydroascorbic acid and sugars using the same transporter complex. (2014). https://pubmed.ncbi.nlm.nih.gov/24598365/ DOI: 10.1152/ajpcell.00044.2014
    Complete structured claim and evidence

  7. Purified rat liver thioredoxin reductase reduced DHA using NADPH, with apparent DHA Km 2.5 mM and turnover 90 min−1.

    Rat thioredoxin reductase 1 / Txnrd1 → Dehydroascorbic acid source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    true
    experimental_model
    Purified rat liver thioredoxin reductase/thioredoxin and selenium-deficient rat liver
    exposure
    Purified enzyme plus NADPH and DHA
    limitations
    Biochemical capacity; not the same as cellular rate at low DHA concentration.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Rattus norvegicus
    plain_language
    Thioredoxin reductase provides another route for recovering reduced vitamin C.
    primary_references
    [may1997] Reduction of dehydroascorbate to ascorbate by the selenoenzyme thioredoxin reductase. (1997). https://pubmed.ncbi.nlm.nih.gov/9278416/ DOI: 10.1074/jbc.272.36.22607
    tissue_or_cell_type
    Purified liver enzyme

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 377–388

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Purified rat liver thioredoxin reductase/thioredoxin and selenium-deficient rat liver · source_derived_draft · unverified_draft

    ### vc-transport-txnrd-dha Purified rat liver thioredoxin reductase reduced DHA using NADPH, with apparent DHA Km 2.5 mM and turnover 90 min−1. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Thioredoxin reductase provides another route for recovering reduced vitamin C. organism: Rattus norvegicus tissue_or_cell_type: Purified liver enzyme experimental_model: Purified rat liver thioredoxin reductase/thioredoxin and selenium-deficient rat liver limitations: Biochemical capacity; not the same as cellular rate at low DHA concentration. exposure: Purified enzyme plus NADPH and DHA cross_nutrient: true [may1997] Reduction of dehydroascorbate to ascorbate by the selenoenzyme thioredoxin reductase. (1997). https://pubmed.ncbi.nlm.nih.gov/9278416/ DOI: 10.1074/jbc.272.36.22607
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. JLP-119 lymphoma cells died after extracellular ascorbate exposure even when previously loaded to about 3 mM intracellular ascorbate; matched loading through dehydroascorbic acid did not reproduce the extracellular-ascorbate death effect.

    L-Ascorbate → Lymphoma cell death source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    evidence_location
    Figure 2D–E
    experimental_model
    Human JLP-119 Burkitt lymphoma culture; 1-h exposure, washing, Hoechst/propidium iodide cell-death assessment after 18–22 h
    exposure
    Fresh L-ascorbic acid neutralized to pH 7.0; 2 mM extracellular ascorbate for 1 h; cells 2.5 × 10^5/mL in serum-containing culture medium.
    limitations
    Pharmacological in-vitro exposure; medium chemistry and peroxide clearance differ from intact tissues. No dietary or clinical anticancer inference. This conclusion is specific to this line and loading protocol.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Homo sapiens
    plain_language
    The killing depended on vitamin C outside these lymphoma cells, not merely on having vitamin C inside them.
    primary_references
    [c-reg-chen] Pharmacologic ascorbic acid concentrations selectively kill cancer cells: action as a pro-drug to deliver hydrogen peroxide to tissues. (2005). https://pubmed.ncbi.nlm.nih.gov/16157892/ DOI: 10.1073/pnas.0506390102
    tissue_or_cell_type
    Burkitt lymphoma cells

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 1229–1241

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human JLP-119 Burkitt lymphoma culture; 1-h exposure, washing, Hoechst/propidium iodide cell-death assessment after 18–22 h · source_derived_draft · unverified_draft

    ### c-reg-lymphoma-extracellular-ascorbate JLP-119 lymphoma cells died after extracellular ascorbate exposure even when previously loaded to about 3 mM intracellular ascorbate; matched loading through dehydroascorbic acid did not reproduce the extracellular-ascorbate death effect. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: The killing depended on vitamin C outside these lymphoma cells, not merely on having vitamin C inside them. organism: Homo sapiens tissue_or_cell_type: Burkitt lymphoma cells experimental_model: Human JLP-119 Burkitt lymphoma culture; 1-h exposure, washing, Hoechst/propidium iodide cell-death assessment after 18–22 h limitations: Pharmacological in-vitro exposure; medium chemistry and peroxide clearance differ from intact tissues. No dietary or clinical anticancer inference. This conclusion is specific to this line and loading protocol. exposure: Fresh L-ascorbic acid neutralized to pH 7.0; 2 mM extracellular ascorbate for 1 h; cells 2.5 × 10^5/mL in serum-containing culture medium. cross_nutrient: false evidence_location: Figure 2D–E [c-reg-chen] Pharmacologic ascorbic acid concentrations selectively kill cancer cells: action as a pro-drug to deliver hydrogen peroxide to tissues. (2005). https://pubmed.ncbi.nlm.nih.gov/16157892/ DOI: 10.1073/pnas.0506390102
    Complete structured claim and evidence

  2. Coupling bovine DBH tyramine hydroxylation to semidehydroascorbate reductase identified semidehydroascorbate as the immediate enzymic oxidation product of ascorbate.

    L-Ascorbate → Ascorbyl radical source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    Vitamin C chemistry in collagen, modified-lysine/carnitine metabolism or copper-dependent peptide/catecholamine processing.
    experimental_model
    Purified bovine DBH coupled to rat-liver or Neurospora semidehydroascorbate reductase
    exposure
    Tyramine beta-hydroxylation with ascorbate; coupled pyridine-nucleotide oxidation and radical recycling assays.
    limitations
    Heterologous reductase-coupled assay; radical dismutation can subsequently produce DHA, so immediate product and net redox balance must be distinguished.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Bos taurus; Rattus norvegicus; Neurospora crassa
    plain_language
    This copper enzyme takes single electrons from vitamin C, leaving an ascorbyl radical that can be recycled.
    primary_references
    [dbh1981] Mechanism of dopamine-beta-hydroxylation. Semidehydroascorbate as the enzyme oxidation product of ascorbate. (1981). https://pubmed.ncbi.nlm.nih.gov/6451628/ DOI: 10.1016/S0021-9258(19)69620-1
    tissue_or_cell_type
    Bovine adrenal-medullary enzyme plus heterologous reductase preparations

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 807–818

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Purified bovine DBH coupled to rat-liver or Neurospora semidehydroascorbate reductase · source_derived_draft · unverified_draft

    ### vc-enzyme-dbh-radical-product Coupling bovine DBH tyramine hydroxylation to semidehydroascorbate reductase identified semidehydroascorbate as the immediate enzymic oxidation product of ascorbate. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: This copper enzyme takes single electrons from vitamin C, leaving an ascorbyl radical that can be recycled. organism: Bos taurus; Rattus norvegicus; Neurospora crassa tissue_or_cell_type: Bovine adrenal-medullary enzyme plus heterologous reductase preparations experimental_model: Purified bovine DBH coupled to rat-liver or Neurospora semidehydroascorbate reductase limitations: Heterologous reductase-coupled assay; radical dismutation can subsequently produce DHA, so immediate product and net redox balance must be distinguished. cross_nutrient: Vitamin C chemistry in collagen, modified-lysine/carnitine metabolism or copper-dependent peptide/catecholamine processing. exposure: Tyramine beta-hydroxylation with ascorbate; coupled pyridine-nucleotide oxidation and radical recycling assays. [dbh1981] Mechanism of dopamine-beta-hydroxylation. Semidehydroascorbate as the enzyme oxidation product of ascorbate. (1981). https://pubmed.ncbi.nlm.nih.gov/6451628/ DOI: 10.1016/S0021-9258(19)69620-1
    Complete structured claim and evidence

  3. Chronically vitamin-C-restricted guinea pigs had a higher brain DHA percentage despite lower total brain vitamin C.

    Vitamin C → Brain dehydroascorbic acid fraction source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    nutrient_deficiency Imported condition classification; unverified.
    cross_nutrient
    false
    experimental_model
    Thirty female guinea pig offspring, control/deficient/repleted diets, postnatal day 70
    exposure
    Prenatal/postnatal 100/100 mg vitamin C/kg diet versus 900/750 mg/kg controls; female offspring at day 70
    limitations
    A higher oxidized fraction does not establish higher absolute DHA concentration.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Cavia porcellus
    plain_language
    A larger fraction of the smaller brain vitamin C pool was oxidized.
    primary_references
    [brain2014] Chronic vitamin C deficiency promotes redox imbalance in the brain but does not alter sodium-dependent vitamin C transporter 2 expression. (2014). https://pubmed.ncbi.nlm.nih.gov/24787032/ DOI: 10.3390/nu6051809
    tissue_or_cell_type
    Brain
    trigger_kind
    nutrient_deficiency Imported condition classification; unverified.

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 468–479

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Thirty female guinea pig offspring, control/deficient/repleted diets, postnatal day 70 · source_derived_draft · unverified_draft

    ### vc-transport-diet-brain-dha-fraction Chronically vitamin-C-restricted guinea pigs had a higher brain DHA percentage despite lower total brain vitamin C. Condition category: nutrient_deficiency nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: A larger fraction of the smaller brain vitamin C pool was oxidized. organism: Cavia porcellus tissue_or_cell_type: Brain experimental_model: Thirty female guinea pig offspring, control/deficient/repleted diets, postnatal day 70 limitations: A higher oxidized fraction does not establish higher absolute DHA concentration. exposure: Prenatal/postnatal 100/100 mg vitamin C/kg diet versus 900/750 mg/kg controls; female offspring at day 70 cross_nutrient: false [brain2014] Chronic vitamin C deficiency promotes redox imbalance in the brain but does not alter sodium-dependent vitamin C transporter 2 expression. (2014). https://pubmed.ncbi.nlm.nih.gov/24787032/ DOI: 10.3390/nu6051809
    Complete structured claim and evidence

  4. Chronic prenatal and postnatal vitamin C restriction lowered brain total vitamin C in day-70 female guinea pigs.

    Vitamin C → Brain total vitamin C content source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    nutrient_deficiency Imported condition classification; unverified.
    cross_nutrient
    false
    experimental_model
    Thirty female guinea pig offspring, control/deficient/repleted diets, postnatal day 70
    exposure
    Prenatal/postnatal 100/100 mg vitamin C/kg diet versus 900/750 mg/kg controls; female offspring at day 70
    limitations
    Non-scorbutic dietary model; total vitamin C includes reduced and oxidized forms.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Cavia porcellus
    plain_language
    Long-term low intake reduced the brain vitamin C pool.
    primary_references
    [brain2014] Chronic vitamin C deficiency promotes redox imbalance in the brain but does not alter sodium-dependent vitamin C transporter 2 expression. (2014). https://pubmed.ncbi.nlm.nih.gov/24787032/ DOI: 10.3390/nu6051809
    tissue_or_cell_type
    Brain
    trigger_kind
    nutrient_deficiency Imported condition classification; unverified.

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 455–466

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Thirty female guinea pig offspring, control/deficient/repleted diets, postnatal day 70 · source_derived_draft · unverified_draft

    ### vc-transport-diet-brain-vitc Chronic prenatal and postnatal vitamin C restriction lowered brain total vitamin C in day-70 female guinea pigs. Condition category: nutrient_deficiency nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Long-term low intake reduced the brain vitamin C pool. organism: Cavia porcellus tissue_or_cell_type: Brain experimental_model: Thirty female guinea pig offspring, control/deficient/repleted diets, postnatal day 70 limitations: Non-scorbutic dietary model; total vitamin C includes reduced and oxidized forms. exposure: Prenatal/postnatal 100/100 mg vitamin C/kg diet versus 900/750 mg/kg controls; female offspring at day 70 cross_nutrient: false [brain2014] Chronic vitamin C deficiency promotes redox imbalance in the brain but does not alter sodium-dependent vitamin C transporter 2 expression. (2014). https://pubmed.ncbi.nlm.nih.gov/24787032/ DOI: 10.3390/nu6051809
    Complete structured claim and evidence

  5. D-glucose inhibited GLUT1- and GLUT3-mediated DHA uptake in the oocyte expression system.

    D-glucose → Cellular dehydroascorbic acid uptake source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    true
    experimental_model
    Mammalian GLUT cDNAs expressed in Xenopus laevis oocytes; CHO overexpression
    exposure
    D-glucose during heterologous-transporter DHA uptake
    limitations
    Not evidence that eating carbohydrate causes vitamin C deficiency; do not generalize across transporters, redox forms or tissue kinetics.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Xenopus laevis host; mammalian clones
    plain_language
    Glucose competed with oxidized vitamin C uptake in this laboratory transport model.
    primary_references
    [rumsey1997] Glucose transporter isoforms GLUT1 and GLUT3 transport dehydroascorbic acid. (1997). https://pubmed.ncbi.nlm.nih.gov/9228080/ DOI: 10.1074/jbc.272.30.18982
    tissue_or_cell_type
    Oocyte membrane

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 273–284

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Mammalian GLUT cDNAs expressed in Xenopus laevis oocytes; CHO overexpression · source_derived_draft · unverified_draft

    ### vc-transport-glut-glucose-inhibition D-glucose inhibited GLUT1- and GLUT3-mediated DHA uptake in the oocyte expression system. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Glucose competed with oxidized vitamin C uptake in this laboratory transport model. organism: Xenopus laevis host; mammalian clones tissue_or_cell_type: Oocyte membrane experimental_model: Mammalian GLUT cDNAs expressed in Xenopus laevis oocytes; CHO overexpression limitations: Not evidence that eating carbohydrate causes vitamin C deficiency; do not generalize across transporters, redox forms or tissue kinetics. exposure: D-glucose during heterologous-transporter DHA uptake cross_nutrient: true [rumsey1997] Glucose transporter isoforms GLUT1 and GLUT3 transport dehydroascorbic acid. (1997). https://pubmed.ncbi.nlm.nih.gov/9228080/ DOI: 10.1074/jbc.272.30.18982
    Complete structured claim and evidence

  6. Preincubation of isolated rat adipocytes with 0.67 µM insulin increased DHA transport 6–8-fold; intracellular DHA reduction was complete both before and after insulin.

    Insulin → Cellular dehydroascorbic acid uptake source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    true
    experimental_model
    Isolated rat adipocytes and GLUT4-expressing Xenopus oocytes
    exposure
    0.67 µM insulin preincubation
    limitations
    Pharmacological cell exposure; no claim about human vitamin C requirements in diabetes.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Rattus norvegicus
    plain_language
    Insulin increased oxidized vitamin C entry into rat fat cells, rather than simply speeding its internal reduction.
    primary_references
    [rumsey2000] Dehydroascorbic acid transport by GLUT4 in Xenopus oocytes and isolated rat adipocytes. (2000). https://pubmed.ncbi.nlm.nih.gov/10862609/ DOI: 10.1074/jbc.m000988200
    tissue_or_cell_type
    Adipocytes

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 299–310

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Isolated rat adipocytes and GLUT4-expressing Xenopus oocytes · source_derived_draft · unverified_draft

    ### vc-transport-insulin-dha-uptake Preincubation of isolated rat adipocytes with 0.67 µM insulin increased DHA transport 6–8-fold; intracellular DHA reduction was complete both before and after insulin. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Insulin increased oxidized vitamin C entry into rat fat cells, rather than simply speeding its internal reduction. organism: Rattus norvegicus tissue_or_cell_type: Adipocytes experimental_model: Isolated rat adipocytes and GLUT4-expressing Xenopus oocytes limitations: Pharmacological cell exposure; no claim about human vitamin C requirements in diabetes. exposure: 0.67 µM insulin preincubation cross_nutrient: true [rumsey2000] Dehydroascorbic acid transport by GLUT4 in Xenopus oocytes and isolated rat adipocytes. (2000). https://pubmed.ncbi.nlm.nih.gov/10862609/ DOI: 10.1074/jbc.m000988200
    Complete structured claim and evidence

  7. Montel-Hagen et al. reported that 5 mM glucose did not inhibit DHA accumulation in mature human erythrocytes and interpreted this as preferential DHA transport.

    D-glucose → Cellular dehydroascorbic acid uptake source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    true
    experimental_model
    Human erythroid progenitors, mature RBCs and A431 stomatin transfection
    exposure
    5 mM glucose with radiolabeled DHA; room-temperature uptake time courses
    limitations
    Published interpretation challenged by kinetic analyses that distinguish transport, intracellular reduction and sugar loading.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Homo sapiens
    plain_language
    One study reported that glucose did not compete with oxidized vitamin C uptake in mature red cells.
    primary_references
    [montelhagen2008] Erythrocyte Glut1 triggers dehydroascorbic acid uptake in mammals unable to synthesize vitamin C. (2008). https://pubmed.ncbi.nlm.nih.gov/18358815/ DOI: 10.1016/j.cell.2008.01.042
    tissue_or_cell_type
    Mature erythrocytes

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 520–531

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human erythroid progenitors, mature RBCs and A431 stomatin transfection · source_derived_draft · unverified_draft

    ### vc-transport-rbc-glucose-noncompetition Montel-Hagen et al. reported that 5 mM glucose did not inhibit DHA accumulation in mature human erythrocytes and interpreted this as preferential DHA transport. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: One study reported that glucose did not compete with oxidized vitamin C uptake in mature red cells. organism: Homo sapiens tissue_or_cell_type: Mature erythrocytes experimental_model: Human erythroid progenitors, mature RBCs and A431 stomatin transfection limitations: Published interpretation challenged by kinetic analyses that distinguish transport, intracellular reduction and sugar loading. exposure: 5 mM glucose with radiolabeled DHA; room-temperature uptake time courses cross_nutrient: true [montelhagen2008] Erythrocyte Glut1 triggers dehydroascorbic acid uptake in mammals unable to synthesize vitamin C. (2008). https://pubmed.ncbi.nlm.nih.gov/18358815/ DOI: 10.1016/j.cell.2008.01.042
    Complete structured claim and evidence

  8. During DHA reduction by human erythrocytes, 5 mM D-glucose maintained GSH and NADH concentrations whereas NADPH still declined; without glucose all three fell.

    D-glucose → Dehydroascorbic acid reduction to ascorbate source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    true
    experimental_model
    Human volunteer erythrocytes ex vivo
    exposure
    DHA challenge with or without 5 mM glucose
    limitations
    Metabolic support and transporter competition are different processes; this does not imply dietary sugar supplementation is needed.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Homo sapiens
    plain_language
    Glucose metabolism helped sustain the reducing resources used to recycle vitamin C.
    primary_references
    [may2001] Mechanisms of ascorbic acid recycling in human erythrocytes. (2001). https://pubmed.ncbi.nlm.nih.gov/11687303/ DOI: 10.1016/s0304-4165(01)00188-x
    tissue_or_cell_type
    Erythrocytes

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 325–336

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human volunteer erythrocytes ex vivo · source_derived_draft · unverified_draft

    ### vc-transport-rbc-glucose-support During DHA reduction by human erythrocytes, 5 mM D-glucose maintained GSH and NADH concentrations whereas NADPH still declined; without glucose all three fell. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Glucose metabolism helped sustain the reducing resources used to recycle vitamin C. organism: Homo sapiens tissue_or_cell_type: Erythrocytes experimental_model: Human volunteer erythrocytes ex vivo limitations: Metabolic support and transporter competition are different processes; this does not imply dietary sugar supplementation is needed. exposure: DHA challenge with or without 5 mM glucose cross_nutrient: true [may2001] Mechanisms of ascorbic acid recycling in human erythrocytes. (2001). https://pubmed.ncbi.nlm.nih.gov/11687303/ DOI: 10.1016/s0304-4165(01)00188-x
    Complete structured claim and evidence

  9. Diethyl maleate depletion of erythrocyte GSH by 75–90% reduced the combined uptake and conversion of DHA to ascorbate in human cells.

    Diethyl maleate → Dehydroascorbic acid reduction to ascorbate source_derived_draftungraded
    Experimental context and source evidence
    availability_state
    machinery_impairment Imported condition classification; unverified.
    cross_nutrient
    true
    experimental_model
    Human volunteer erythrocytes ex vivo
    exposure
    Up to 1 mM diethyl maleate ex vivo
    limitations
    Chemical depletion, not dietary deficiency; combined uptake/reduction readout does not isolate membrane transport.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Homo sapiens
    plain_language
    Depleting glutathione impaired the red cells’ vitamin C recycling capacity.
    primary_references
    [may2001] Mechanisms of ascorbic acid recycling in human erythrocytes. (2001). https://pubmed.ncbi.nlm.nih.gov/11687303/ DOI: 10.1016/s0304-4165(01)00188-x
    tissue_or_cell_type
    Erythrocytes
    trigger_kind
    machinery_impairment Imported condition classification; unverified.

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 338–349

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human volunteer erythrocytes ex vivo · source_derived_draft · unverified_draft

    ### vc-transport-rbc-gsh-depletion Diethyl maleate depletion of erythrocyte GSH by 75–90% reduced the combined uptake and conversion of DHA to ascorbate in human cells. Condition category: machinery_impairment nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Depleting glutathione impaired the red cells’ vitamin C recycling capacity. organism: Homo sapiens tissue_or_cell_type: Erythrocytes experimental_model: Human volunteer erythrocytes ex vivo limitations: Chemical depletion, not dietary deficiency; combined uptake/reduction readout does not isolate membrane transport. exposure: Up to 1 mM diethyl maleate ex vivo cross_nutrient: true [may2001] Mechanisms of ascorbic acid recycling in human erythrocytes. (2001). https://pubmed.ncbi.nlm.nih.gov/11687303/ DOI: 10.1016/s0304-4165(01)00188-x
    Complete structured claim and evidence

  10. Stomatin transfection increased DHA uptake in human A431 cells while GLUT1 abundance was unchanged; GLUT1 knockdown reduced uptake.

    Human stomatin / STOM → Cellular dehydroascorbic acid uptake source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    false
    experimental_model
    Human erythroid progenitors, mature RBCs and A431 stomatin transfection
    exposure
    Stomatin transfection; 30- and 300-second uptake assays
    limitations
    Cancer cell line; preferential-transport interpretation is disputed by later erythrocyte kinetics.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Homo sapiens
    plain_language
    Stomatin changed oxidized vitamin C uptake without simply adding more GLUT1 protein.
    primary_references
    [montelhagen2008] Erythrocyte Glut1 triggers dehydroascorbic acid uptake in mammals unable to synthesize vitamin C. (2008). https://pubmed.ncbi.nlm.nih.gov/18358815/ DOI: 10.1016/j.cell.2008.01.042
    tissue_or_cell_type
    A431 cells

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 507–518

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Human erythroid progenitors, mature RBCs and A431 stomatin transfection · source_derived_draft · unverified_draft

    ### vc-transport-stomatin-dha Stomatin transfection increased DHA uptake in human A431 cells while GLUT1 abundance was unchanged; GLUT1 knockdown reduced uptake. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Stomatin changed oxidized vitamin C uptake without simply adding more GLUT1 protein. organism: Homo sapiens tissue_or_cell_type: A431 cells experimental_model: Human erythroid progenitors, mature RBCs and A431 stomatin transfection limitations: Cancer cell line; preferential-transport interpretation is disputed by later erythrocyte kinetics. exposure: Stomatin transfection; 30- and 300-second uptake assays cross_nutrient: false [montelhagen2008] Erythrocyte Glut1 triggers dehydroascorbic acid uptake in mammals unable to synthesize vitamin C. (2008). https://pubmed.ncbi.nlm.nih.gov/18358815/ DOI: 10.1016/j.cell.2008.01.042
    Complete structured claim and evidence

  11. Adding 2.8 µM rat liver thioredoxin lowered apparent DHA Km of the thioredoxin-reductase system from 2.5 to 0.7 mM without materially increasing turnover.

    Rat thioredoxin 1 / Txn1 → Dehydroascorbic acid reduction to ascorbate source_derived_draftungraded
    Experimental context and source evidence
    cross_nutrient
    true
    experimental_model
    Purified rat liver thioredoxin reductase/thioredoxin and selenium-deficient rat liver
    exposure
    2.8 µM thioredoxin added to NADPH/thioredoxin-reductase assay
    limitations
    Apparent kinetic effect is not proof of a faster whole-body recycling rate.
    nutrient_topic
    Vitamin C research collection; topical membership is not evidence of a direct dietary effect. · Vitamin C
    organism
    Rattus norvegicus
    plain_language
    Thioredoxin improved the system’s apparent affinity for oxidized vitamin C in this assay.
    primary_references
    [may1997] Reduction of dehydroascorbate to ascorbate by the selenoenzyme thioredoxin reductase. (1997). https://pubmed.ncbi.nlm.nih.gov/9278416/ DOI: 10.1074/jbc.272.36.22607
    tissue_or_cell_type
    Purified liver enzymes

    Vitamin C: mechanisms, deficiency and nutrient interactions (2026-09-17) · lines 390–401

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Purified rat liver thioredoxin reductase/thioredoxin and selenium-deficient rat liver · source_derived_draft · unverified_draft

    ### vc-transport-thioredoxin-dha-affinity Adding 2.8 µM rat liver thioredoxin lowered apparent DHA Km of the thioredoxin-reductase system from 2.5 to 0.7 mM without materially increasing turnover. Condition category: normal nutrient_topic: Vitamin C research collection; topical membership is not evidence of a direct dietary effect. plain_language: Thioredoxin improved the system’s apparent affinity for oxidized vitamin C in this assay. organism: Rattus norvegicus tissue_or_cell_type: Purified liver enzymes experimental_model: Purified rat liver thioredoxin reductase/thioredoxin and selenium-deficient rat liver limitations: Apparent kinetic effect is not proof of a faster whole-body recycling rate. exposure: 2.8 µM thioredoxin added to NADPH/thioredoxin-reductase assay cross_nutrient: true [may1997] Reduction of dehydroascorbate to ascorbate by the selenoenzyme thioredoxin reductase. (1997). https://pubmed.ncbi.nlm.nih.gov/9278416/ DOI: 10.1074/jbc.272.36.22607
    Complete structured claim and evidence

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