Concerning the Structure of D-Glucosone

Becker, Charles E.; May, Clarence E.

doi:10.1021/ja01172a501

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A-tocopherol and Tyrosinc1

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1953

1985

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“…Water 15.0 transfers have been found andlor proposed in several systems comprising excited carbonyl compounds and different phenol derivatives (Becker, 1967a;Turro and Engel, 1969;Rosenfeld et al, 1973).…”

Section: 4mentioning

confidence: 99%

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QUENCHING OF TRIPLET BENZOPHENONE BY VITAMINS E and C and BY SULFUR CONTAINING AMINO ACIDS and PEPTIDES

Encinas

Lissi

Olea

1985

Photochem & Photobiology

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The quenching rate of triplet benzophenone in water and/or water mixtures has been determined employing vitamin C, vitamin E, cystine, cysteine, reduced and oxidized glutathione, methionine and DL-penicillamine. In these systems, the ketyl radical quantum yield and the benzophenone photoreduction yield have also been measured. The ketyl quantum yield is 1 .0 in presence of vitamin C and smaller than 0.3 in presence of glutathione, cysteine and cystine. The data imply that quenching by thiols and disulfides takes place, at least in very polar solvents, mainly by a mechanism involving charge transfer intermediates.

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Section: 4mentioning

confidence: 99%

“…The contribution of the hydrogen transfer step to the overall rate is emphasized by the slower rates obtained employing the corresponding alkyl derivatives (Ronfard-Haret ct a!., 1983) or alanine (see Table 1). The photoreduction of benzophenone by phenols gives rise to a variety of products (Becker. 1967a(Becker.…”

Section: A-tocopherol and Tyrosincmentioning

confidence: 99%