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Urolithins are microflora human metabolites of dietary ellagic acid derivatives such as ellagitannins. They are produced in the human gut, and found in the urine in the form of urolithin B glucuronide after absorption of ellagitannins-containing food such as pomegranate, strawberries, red raspberries, walnuts or oak-aged red wine. During intestinal metabolism by bacteria, ellagitannins and punicalagins are converted to urolithins, which have unknown biological activity ''in vivo'' in humans.〔 Urolithins metabolites of pomegranate juice ellagitannins localize specifically in the prostate gland, colon, and intestinal tissues of mice, leading to clinical studies of pomegranate juice or fruit extracts for efficacy against several diseases. Ellagitannins exhibit low bioavailability and are transformed in the gut to ellagic acid and its microbiota metabolites. Urolithins are found in plasma mostly as glucuronides at low concentrations. Urolithins production is dependent on the gut microbiome enterotype. Individuals producing urolithins show a much higher abundance of the ''Clostridium leptum'' group of Firmicutes phylum than ''Bacteroides'' or ''Prevotella''. Urolithin M7 has also been synthetized from 2-hydroxy-4-methoxybenzaldehyde using the inverse electron-demand Diels–Alder reaction. == Known molecules == * Urolithin A (3,8-Dihydroxyurolithin) * Urolithin A glucuronide * Urolithin B (3-Hydroxyurolithin) * urolithin B glucuronide * Urolithin D (3,4,8,9-Tetrahydroxyurolithin) catabolic intermediates: * Urolithin M-5 * Urolithin M-6 * Urolithin M-7 * Urolithin C (3,8,9-Trihydroxy urolithin) * Urolithin E (2,3,8,10-Tetrahydroxy urolithin) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「urolithin」の詳細全文を読む スポンサード リンク
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