Spectrophotometric study of the solution interactions between riboflavin, sodium salicylate and caffeine

被引：0
|
作者：
Bolotin, P. A. [1 ]
Baranovsky, S. F. [1 ]
Chernyshev, D. N. [1 ]
Evstigneev, M. P. [1 ]
机构：
[1] Sevastopol Natl Tech Univ, Dept Phys, UA-99053 Crimea, Ukraine
来源：
INTERNATIONAL JOURNAL OF PHYSICAL SCIENCES | 2007年 / 2卷 / 03期
关键词：
Spectrophotometry; riboflavin; caffeine; nicotinamide; urea; hetero-association;
D O I：
暂无
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The self-association of Vitamin B-2 (Riboflavin, RBF) and its hetero-association with Sodium Salicylate (NAS) and Caffeine (CAF) have been studied in aqueous solution by UV-Vis spectrophotometry. Using modified Benesi-Hildebrand approach equilibrium hetero-association constants were obtained for RBF-NAS [K = (25 +/- 4) M-1] and RBF-CAF [K = (69 +/- 4) M-1] systems at T = 298K. Absorption spectra of the vitamin in the mixed solutions with CAF/NAS evidence a bathochromic and hyperchromic shifts which are indicative of the hetero-association process between the dissolved molecules, most likely occurring via vertical stacking of their chromophores. Addition of Urea to the solutions of RBF-NAS and RBF-CAF decreases the stability of the hetero-complexes downto K = (17 +/- 3) M-1 and K = (51 +/- 7) M-1, respectively.
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页码：68 / 72
页数：5
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