4-チオウリジン水溶液の光化学反応
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4-Thiouridine aqueous solution was irradiated with near UV light under aerobic condition in order to investigate photochemical property of 4-thiouridine in vivo. Reaction on 4-thiouridine was observed with pseudo first order rate (k=0.006min) leading to the formation of uridine, especially after heat treatment, as a main product. Photochemical behaviors of bis-4-thiouridine disulfide and uridine-4-sulfonic acid, which were supposed to be intermediates in this reaction process, were investigated under the similar condition employed for 4-thiouridine. Interestingly bis-4-thiouridine disulfide was converted to give A-thiouridine (about 50 mole%) possibly through the photochemical hydrolysis of the disulfide linkage. Uridine-4-sulfonic acid was converted rapidly to uridine with pseudo first order rate (k=0.037/min). Possibility for the photochemical formation of 4-thiouridine hydrate, though no reversion into the starting material was observed after heat treatment of the reaction solution, was discussed. The pathway of the photochemical reaction of 4-thiouridine might be a kind of multiform one. Moreover, photosensitized oxygenation of 4-thiouridine with red light illumination was investigated in the presence of methylene blue as a photosensitizer. The reaction of 4-thiouridine to give uridine was shown to be uniform and quantitative. Based upon the results obtained, it is supposed that (a part of) 4 sU incorporated into etiolated cotyledons might be detoxicated via photochemical processes and/or photo-sensitized oxygenation.
- 社団法人 日本農芸化学会の論文
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