The Preparation of Riboflavin.<sup>1</sup> III. The Synthesis of Alloxazines and Isoalloxazines
作者:Max Tishler、J. W. Wellman、Kurt Ladenburg
DOI:10.1021/ja01228a031
日期:1945.12
Kuhn; Wagner-Jauregg, Chemische Berichte, 1933, vol. 66, p. 1577,1582
作者:Kuhn、Wagner-Jauregg
DOI:——
日期:——
Spectroscopic study of photo and thermal destruction of riboflavin
作者:Salikh Astanov、Mirzo Z. Sharipov、Askar R. Fayzullaev、Eldar N. Kurtaliev、Negmat Nizomov
DOI:10.1016/j.molstruc.2014.04.077
日期:2014.8
Influence of temperature and light irradiation on the spectroscopic properties of aqueous solutions of riboflavin was studied using linear dichroism method, absorption and fluorescence spectroscopy. It was established that in a wide temperature range 290-423 K there is a decline of absorbance and fluorescence ability, which is explained by thermodestruction of riboflavin. It is shown that the proportion of molecules, which have undergone degradation, are in the range of 4-28%, and depends on the concentration and quantity of temperature effects. Introduction of hydrochloric and sulfuric acids, as well as different metal ions leads to an increase in the photostability of riboflavin solutions by 2-2.5 times. The observed phenomena are explained by the formation protonation form of riboflavin and a complex between the metal ions and oxygen atoms of the carbonyl group of riboflavin, respectively. (C) 2014 Elsevier B.V. All rights reserved.