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- W1998170000 abstract "Abstract—The thionine sensitized photooxidations of several tyrosine derivatives have been compared in a system in which the dye, bound to the anionic polysaccharide alginate, is separated by a dialysis membrane from a much larger external phase containing most of the substrate. Brown oxidation products appear both inside the bag and outside, but at considerably greater concentration inside. Oxidation products inside the bag retard the oxidation of the original substrate by competing with it for photooxidant. Substrates were divided into two groups, related to tyrosine and tyramine respectively, according to their rates of oxidation. The groups differ as to whether the prevailing phenolate form of the substrate is a zwitterion or an anion. In case of the latter, the Donnan equilibrium set up by the polyelectrolyte reduces its concentration in the polymer phase, and thereby the rate of oxidation. Titration and dialysis data support this interpretation." @default.
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- W1998170000 date "1976-01-01" @default.
- W1998170000 modified "2023-10-18" @default.
- W1998170000 title "THE PHOTOSENSITIZED OXIDATION OF TYROSINE DERIVATIVES IN THE PRESENCE OF ALGINATE—II: REACTION UNDER HETEROGENEOUS CONDITIONS" @default.
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- W1998170000 doi "https://doi.org/10.1111/j.1751-1097.1976.tb06763.x" @default.
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