Flavin catabolites: identification and quantitation in human urine
1987
Chastain, J.L. | McCormick, D.B.
Extract: Riboflavin is the primary flavin excreted in human urine but significant amounts of 7alpha-hydroxyriboflavin and lesser amounts of 8alpha-hydroxyriboflavin are present and reflect tissue microsomal oxidations. A newly found flavin catabolite of an 8alpha-sulfonyl type may reflect intake and/or turnover of such thioether-linked flavin as occurs in monoamine oxidase. Additionally, lesser amounts of 10-hydroxyethylflavin (indicative of intestinal microbial action on the vitamin) and traces of lumiflavin (arising from photodecomposition) constitute part of the remaining flavin, which acutely reflects level of intake. (author)
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