Component

Hydroxylation of the aliphatic side chain of a capsaicinoid

Hydroxylation of the aliphatic side chain of a capsaicinoid. Species, exposure and limitations are retained in each linked claim.

3 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 acts on it

  1. Incubation of capsaicin with phenobarbital-induced rat liver postmitochondrial supernatant produced omega-hydroxycapsaicin, also detected in the urine of rabbits given capsaicin, and other analogs of capsaicin such as dihydrocapsaicin and nonivamide also formed similar metabolites via aliphatic hydroxylation; the polar metabolites were inactive when tested for antinociceptive activity and pungency while their parent compounds exhibited strong sensory effects, suggesting that hydroxylation of the side chain plays an important role in detoxification.

    Dihydrocapsaicin → Hydroxylation of the aliphatic side chain of a capsaicinoid source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/dihydrocapsaicin-research/8614248.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "7c4eee5bf34dac159665170e5eca63fcbf3a5146133b9d7dc0b6ec01bda4493a", "start_char": 0, "end_char": 1399, "text_sha256": "7c4eee5bf34dac159665170e5eca63fcbf3a5146133b9d7dc0b6ec01bda4493a"}
    experimental_model
    Incubation with phenobarbital-induced rat liver postmitochondrial supernatant, with rabbit urine confirmation and in vivo activity testing
    exposure
    Capsaicin, dihydrocapsaicin and nonivamide incubated with an NADPH-generating system, with pentobarbital sleeping time as a readout of enzyme inhibition
    limitations
    Identifies side-chain hydroxylation as a shared detoxification route and shows the products are inactive. The enzyme-inhibition arm tested capsaicin, not dihydrocapsaicin, which is recorded on that claim.
    nutrient_topic
    Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. · Dihydrocapsaicin
    organism
    Rat and rabbit
    plain_language
    Putting a hydroxyl on the tail switches the molecule off, for both heat and pain relief.
    primary_references
    [dhc-p8614248] Metabolism of capsaicinoids: evidence for aliphatic hydroxylation and its pharmacological implications. (1995). https://pubmed.ncbi.nlm.nih.gov/8614248/ DOI: 10.1016/0024-3205(95)00091-7
    tissue_or_cell_type
    Liver

    Dihydrocapsaicin: the second capsaicinoid, the hypothermia it is used to induce, what the gut and liver do to it, and what it does without TRPV1 (2026-09-21) · lines 530–541

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Incubation with phenobarbital-induced rat liver postmitochondrial supernatant, with rabbit urine confirmation and in vivo activity testing · source_derived_draft · unverified_draft

    ### dhc-side-chain-hydroxylation Incubation of capsaicin with phenobarbital-induced rat liver postmitochondrial supernatant produced omega-hydroxycapsaicin, also detected in the urine of rabbits given capsaicin, and other analogs of capsaicin such as dihydrocapsaicin and nonivamide also formed similar metabolites via aliphatic hydroxylation; the polar metabolites were inactive when tested for antinociceptive activity and pungency while their parent compounds exhibited strong sensory effects, suggesting that hydroxylation of the side chain plays an important role in detoxification. Condition category: normal nutrient_topic: Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. plain_language: Putting a hydroxyl on the tail switches the molecule off, for both heat and pain relief. organism: Rat and rabbit tissue_or_cell_type: Liver experimental_model: Incubation with phenobarbital-induced rat liver postmitochondrial supernatant, with rabbit urine confirmation and in vivo activity testing limitations: Identifies side-chain hydroxylation as a shared detoxification route and shows the products are inactive. The enzyme-inhibition arm tested capsaicin, not dihydrocapsaicin, which is recorded on that claim. exposure: Capsaicin, dihydrocapsaicin and nonivamide incubated with an NADPH-generating system, with pentobarbital sleeping time as a readout of enzyme inhibition evidence_span: {"source_cache": "artifacts/dihydrocapsaicin-research/8614248.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "7c4eee5bf34dac159665170e5eca63fcbf3a5146133b9d7dc0b6ec01bda4493a", "start_char": 0, "end_char": 1399, "text_sha256": "7c4eee5bf34dac159665170e5eca63fcbf3a5146133b9d7dc0b6ec01bda4493a"} [dhc-p8614248] Metabolism of capsaicinoids: evidence for aliphatic hydroxylation and its pharmacological implications. (1995). https://pubmed.ncbi.nlm.nih.gov/8614248/ DOI: 10.1016/0024-3205(95)00091-7
    Complete structured claim and evidence

Where it participates (unsigned role)

  1. Biotransformation of dihydrocapsaicin by four cultivated human intestinal fungal strains yielded eight metabolites including seven previously undescribed ones, with the main reactions revealed to be hydroxylation, alcohol oxidation and lactylation, the lactylation of hydroxyl groups being mediated mainly by Rhizopus oryzae.

    Cultivated human intestinal fungal strains → Dihydrocapsaicin source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/dihydrocapsaicin-research/36578383.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "a36fc63af6f17ba1a551c87f5c73e288e9f468affcd39bcba5baad1ee1acf338", "start_char": 0, "end_char": 1090, "text_sha256": "a36fc63af6f17ba1a551c87f5c73e288e9f468affcd39bcba5baad1ee1acf338"}
    experimental_model
    Biotransformation of dihydrocapsaicin by four cultivated human intestinal fungal strains with NMR and HRESIMS structure determination
    exposure
    Dihydrocapsaicin incubated with cultivated human intestinal fungal strains
    limitations
    An in vitro biotransformation study with cultivated strains, not a gut community. The enzyme-inhibition result is a property of an isolated metabolite, not a demonstrated effect in an animal.
    nutrient_topic
    Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. · Dihydrocapsaicin
    organism
    Human intestinal fungi
    plain_language
    Fungi living in the human gut rework the molecule into eight different products, most of them new to science.
    primary_references
    [dhc-p36578383] Biotransformation of dihydrocapsaicin by human intestinal fungi and the inhibitory effects of metabolites against LSD1. (2022). https://pubmed.ncbi.nlm.nih.gov/36578383/ DOI: 10.1016/j.heliyon.2022.e12325
    tissue_or_cell_type
    In vitro culture

    Dihydrocapsaicin: the second capsaicinoid, the hypothermia it is used to induce, what the gut and liver do to it, and what it does without TRPV1 (2026-09-21) · lines 569–580

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · Biotransformation of dihydrocapsaicin by four cultivated human intestinal fungal strains with NMR and HRESIMS structure determination · source_derived_draft · unverified_draft

    ### dhc-fungal-biotransformation Biotransformation of dihydrocapsaicin by four cultivated human intestinal fungal strains yielded eight metabolites including seven previously undescribed ones, with the main reactions revealed to be hydroxylation, alcohol oxidation and lactylation, the lactylation of hydroxyl groups being mediated mainly by Rhizopus oryzae. Condition category: normal nutrient_topic: Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. plain_language: Fungi living in the human gut rework the molecule into eight different products, most of them new to science. organism: Human intestinal fungi tissue_or_cell_type: In vitro culture experimental_model: Biotransformation of dihydrocapsaicin by four cultivated human intestinal fungal strains with NMR and HRESIMS structure determination limitations: An in vitro biotransformation study with cultivated strains, not a gut community. The enzyme-inhibition result is a property of an isolated metabolite, not a demonstrated effect in an animal. exposure: Dihydrocapsaicin incubated with cultivated human intestinal fungal strains evidence_span: {"source_cache": "artifacts/dihydrocapsaicin-research/36578383.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "a36fc63af6f17ba1a551c87f5c73e288e9f468affcd39bcba5baad1ee1acf338", "start_char": 0, "end_char": 1090, "text_sha256": "a36fc63af6f17ba1a551c87f5c73e288e9f468affcd39bcba5baad1ee1acf338"} [dhc-p36578383] Biotransformation of dihydrocapsaicin by human intestinal fungi and the inhibitory effects of metabolites against LSD1. (2022). https://pubmed.ncbi.nlm.nih.gov/36578383/ DOI: 10.1016/j.heliyon.2022.e12325
    Complete structured claim and evidence

  2. Much of the published literature on capsaicin is based on pepper extracts, which are typically a mixture of capsaicin and other capsaicinoids including norhydrocapsaicin, dihydrocapsaicin, homocapsaicin and homodihydrocapsaicin, which is why this study examined the in vitro metabolism of pure capsaicin; that metabolism was similar in human, rat and dog microsomes, yielding 16-hydroxycapsaicin, 17-hydroxycapsaicin and 16,17-dehydrocapsaicin, with biotransformation slow in human skin so that cytochrome P450 metabolism in skin is minimal relative to hepatic metabolism.

    Capsaicin → Dihydrocapsaicin source_derived_draftungraded
    Experimental context and source evidence
    evidence_span
    {"source_cache": "artifacts/dihydrocapsaicin-research/18180272.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "cea281309b45a5605f8f845cee01a296e7b62c24db52bc517c968c3750394baf", "start_char": 0, "end_char": 1289, "text_sha256": "cea281309b45a5605f8f845cee01a296e7b62c24db52bc517c968c3750394baf"}
    experimental_model
    In vitro metabolism of pure capsaicin in human, rat and dog microsomes and S9 fractions and in human skin
    exposure
    Pure capsaicin rather than pepper extract
    limitations
    Recorded here for the attribution warning it states rather than for its capsaicin metabolites: it is explicit that much published capsaicin literature used mixtures containing dihydrocapsaicin.
    nutrient_topic
    Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. · Dihydrocapsaicin
    organism
    Human, rat and dog
    plain_language
    A warning worth keeping: a great deal of what is filed under capsaicin was measured on a mixture that contained this compound too.
    primary_references
    [dhc-p18180272] In vitro hepatic and skin metabolism of capsaicin. (2008). https://pubmed.ncbi.nlm.nih.gov/18180272/ DOI: 10.1124/dmd.107.019240
    tissue_or_cell_type
    Liver microsomes and skin

    Dihydrocapsaicin: the second capsaicinoid, the hypothermia it is used to induce, what the gut and liver do to it, and what it does without TRPV1 (2026-09-21) · lines 647–658

    AI-assisted literature curation; primary study URLs and scope retained in the document and extraction. Not publisher full text. · supports · In vitro metabolism of pure capsaicin in human, rat and dog microsomes and S9 fractions and in human skin · source_derived_draft · unverified_draft

    ### dhc-published-work-used-mixtures Much of the published literature on capsaicin is based on pepper extracts, which are typically a mixture of capsaicin and other capsaicinoids including norhydrocapsaicin, dihydrocapsaicin, homocapsaicin and homodihydrocapsaicin, which is why this study examined the in vitro metabolism of pure capsaicin; that metabolism was similar in human, rat and dog microsomes, yielding 16-hydroxycapsaicin, 17-hydroxycapsaicin and 16,17-dehydrocapsaicin, with biotransformation slow in human skin so that cytochrome P450 metabolism in skin is minimal relative to hepatic metabolism. Condition category: normal nutrient_topic: Dihydrocapsaicin research collection; topical membership is not evidence of a direct clinical effect, and dihydrocapsaicin is recorded separately from capsaicin. plain_language: A warning worth keeping: a great deal of what is filed under capsaicin was measured on a mixture that contained this compound too. organism: Human, rat and dog tissue_or_cell_type: Liver microsomes and skin experimental_model: In vitro metabolism of pure capsaicin in human, rat and dog microsomes and S9 fractions and in human skin limitations: Recorded here for the attribution warning it states rather than for its capsaicin metabolites: it is explicit that much published capsaicin literature used mixtures containing dihydrocapsaicin. exposure: Pure capsaicin rather than pepper extract evidence_span: {"source_cache": "artifacts/dihydrocapsaicin-research/18180272.abstract.txt", "locator": "Indexed abstract; zero-based, end-exclusive Unicode character offsets", "file_sha256": "cea281309b45a5605f8f845cee01a296e7b62c24db52bc517c968c3750394baf", "start_char": 0, "end_char": 1289, "text_sha256": "cea281309b45a5605f8f845cee01a296e7b62c24db52bc517c968c3750394baf"} [dhc-p18180272] In vitro hepatic and skin metabolism of capsaicin. (2008). https://pubmed.ncbi.nlm.nih.gov/18180272/ DOI: 10.1124/dmd.107.019240
    Complete structured claim and evidence

In the sources

Preserved passages that mention this component, quoted exactly. Open one to read it in context.

    This is a research prototype built from draft material. It is not medical advice, and its statements still await verification against the original studies.

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