Author: "Scurachio, Regina S." / Publication Year: 2013

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Author:: Scurachio, Regina S., et al. ; Cardoso, Daniel R.; Santos, Willy G.; Homem-de-Mello, Paula; Skibsted, Leif H.; Show all 5 Authors
Source:: Journal of agricultural and food chemistry 2013 v.61 no.9 pp. 2268-2275
ISSN:: 1520-5118
Subject:: cholesterol; conjugated linoleic acid; dissociation; ergosterol; esters; eyes; hydrogen; oxidation; photolysis; phytosterols; polyunsaturated fatty acids; riboflavin
Abstract:: ... Methyl esters of polyunsaturated fatty acids were found to quench triplet-excited riboflavin (³Rib) in efficient bimolecular reactions with rate constants, as determined by laser flash photolysis, linearly depending upon the number of bis-allylic methylene (from 1 to 5). Deactivation of ³Rib is predicted by combining the experimental second-order rate constants k₂ determined for acetonitrile/water ...
DOI:: 10.1021/jf305280x
PubMed:: 23402498
: http://dx.doi.org/10.1021%2Fjf305280x

Author:: Scurachio, Regina S., et al. ; de O. R. Arrivetti, Leandro; Santos, Willy G.; Papa, Thiago B. R.; Skibsted, Leif H.; Cardoso, Daniel R.; Show all 6 Authors
Source:: Journal of agricultural and food chemistry 2013 v.61 no.31 pp. 7615-7620
ISSN:: 1520-5118
Subject:: biotin; fluorescence; niacin; photooxidation; pyridoxal phosphate; riboflavin
Abstract:: ... Pyridoxal phosphate (PLP) was found to deactivate triplet-excited riboflavin (Rib) in aqueous solution with a deactivation constant of 3.0 ± 0.1 × 10⁸ L mol–¹ s–¹ at 25 °C. Likewise, PLP was found to quench the fluorescence emission of ¹Rib* with ¹kq = 1.0 ± 0.1 × 10¹¹ L mol–¹ s–¹ as determined by steady state fluorescence. The rather high quenching constant suggests the formation of a ground stat ...
DOI:: 10.1021/jf402123d
PubMed:: 23848945
: http://dx.doi.org/10.1021%2Fjf402123d