International Journal of Physical Sciences | |
Spectrophotometric study of the solution interactions between riboflavin, sodium salicylate and caffeine | |
Bolotin P. A.1  | |
关键词: Spectrophotometry; riboflavin; caffeine; nicotinamide; urea; hetero-association; | |
DOI : | |
学科分类:物理(综合) | |
来源: Academic Journals | |
【 摘 要 】
The self-association of Vitamin B2(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-1and K = (51±7)M-1, respectively.
【 授权许可】
CC BY
【 预 览 】
Files | Size | Format | View |
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RO201902016239485ZK.pdf | 130KB | download |