NII-Electronic Library Service
NII-Electronic Library Service
NII-Electronic Library Service
NII-Electronic Library Service
Biphasic photolysis of riboflavin. III. Effects of ionic strength on the photolysis.
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TLDR
Riboflavin undergoes a characteristic biphasic photolysis with a low-intensity light source, depending on the ionic strength of the phosphate buffer used, and a side chain-isoalloxazine ring interaction through hydrogen bonding is considered to be responsible for the ionsic strength dependence.Abstract:
Riboflavin undergoes a characteristic biphasic photolysis with a low-intensity light source, depending on the ionic strength of the phosphate buffer used. In higher ionic strength phosphate buffer, an initial faster phase is followed by a slower second phase, and vice versa in lower ionic strength buffer. On the basis of the circular dichroism spectra, a side chain-isoalloxazine ring interaction through hydrogen bonding is considered to be responsible for the ionic strength dependence.read more
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Journal ArticleDOI
Photo, thermal and chemical degradation of riboflavin
TL;DR: Riboflavin, also known as vitamin B2, belongs to the class of water-soluble vitamins and is widely present in a variety of food products and pharmaceutical preparations, and is sensitive to light and high temperature.
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Photolysis of riboflavin in aqueous solution: a kinetic study.
TL;DR: The kinetics of photolysis of aqueous riboflavin solutions on UV and visible irradiation has been studied in the pH range 1-12 using a specific multicomponent spectrophotometric method and the log k-pH profiles indicate that rib oflavin has maximum photostability around pH 5-6, at which the rate of oxidation-reduction of the molecule is lowest.
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A study of simultaneous photolysis and photoaddition reactions of riboflavin in aqueous solution.
TL;DR: It is suggested that H(2)PO(4)(-) and HPO( 4)(2-) ions may catalyse the two major reaction pathways of riboflavin photodegradation, respectively.
Journal ArticleDOI
Effect of Caffeine Complexation on the Photolysis of Riboflavin in Aqueous Solution: A Kinetic Study
TL;DR: The photochemical interaction of riboflavin with caffeine suggests that a pH around 6 is most appropriate for the stabilization of the vitamin and at this pH the complex shows the highest stability constant.
Journal ArticleDOI
Ionic strength effects on the photodegradation reactions of riboflavin in aqueous solution.
TL;DR: NaCl appears to promote the photodegradation reactions of RF probably by an excited state interaction and the implications of ionic strength on RFPhotodegradation by different pathways and flavin-protein interactions have been discussed.