The metabolic fate of vanillylamine, a componentof capsaicin, in Pseudomonasfluorescens B56 was examined under both growing and non-growing conditions. Under growing conditions, the cells metabolized vanillylamine to vanillin, and vanillin to vanillic acid and a small amount of vanillyl alcohol. Under non-growing conditions, the cells produced vanillin, vanillic acid and protocatechuic acid from vanillylamine, and vanillic acid supplied to the mediumwas converted to protocatechuic acid. It is thus suggested that vanillylamine is metabolized to vanillic acid through vanillin by Pseudomonasfluorescens B56 in a rich medium, however, in a starving medium, the bacterial strain further metabolizes vanillic acid to protocatechuic acid. The vanillylamine metabolic activity was slowly induced by the substrate.Capsaicin is a pungent principle of Capsicum species. The metabolic fate of capsaicin and related compounds has been studied in rat1 } and Rhodopseudomonas acidophilia.2~4)
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