トリプトファンの光分解生成物

概要

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Experiments were attempted to identify the substances which were formed from the aqueous tryptophan solution and followed the development of the brown color and the fluorescence by exposure to sunlight. After the irradiation for 15 days, tryptophan in the solution became negli-gible for qualitative test and then the solution was precipitated with Hg(BcO)2 in 50% (V/V) acetic acid, treated with H2S and the resulting solution was analysed by the paper chromatogr-aphic technique (see Table 1). Also the ultraviolet absorption spectra of the eluates from the chromatograms wereestimated by Beckmanns spectrophotometer. These data indicated that tryptophan was converted into kynurenine, anthranilic acid and probably 3-hydroxykynurenine, and kynurenine might be an intermediate substance of the browning reactions. On the other hand we isolated red-violet needles which were sublimating at >210° and absorbing 533mμ wave in the acetone solution.
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