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- W108807732 abstract "When (2-/sup 14/C) riboflavin is injected i.p. into rats, the excreted vitamin in urine and feces has been shown to be the intact vitamin with trace amounts of lumichrome and lumiflavin. Recent findings with /sup 14/C-riboflavin fed to rats indicated higher levels of riboflavin catabolites in urine, e.g., 7- and 8-carboxylumichromes. The authors have determined catabolites in urine from male rats fed 0, 2, and 6 ..mu..g riboflavin/g diet/day for six weeks. Two rats from each group were placed weekly in metabolic cages, and urine was collected for 24 hours. On the fourth week, a third animal from each group received an i.p. injection of /sup 14/C-riboflavin and the urine was collected for 48 hours. Urine samples were extracted with phenol for flavin components and with chloroform for derivatives of lumichrome and lumiflavin. Riboflavin was the predominant flavin excreted by all diet groups with trace amounts of coenzymes and 7- and 8-hydroxymethylriboflavin. Riboflavin accounted for 85% of all the radioactivity recovered from the deficient and sufficient rats and 90% in rats fed excess. Lumichrome-type compounds including carboxylumichromes accounted for only a few % of recovered radioactivity. Thus, these components are primarily a product of intestinal microfloral degradation rather than significantmore » tissue catabolites of riboflavin.« less" @default.
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- W108807732 date "1986-03-05" @default.
- W108807732 modified "2023-09-28" @default.
- W108807732 title "Quantitation of products from riboflavin in rat urine" @default.
- W108807732 hasPublicationYear "1986" @default.
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