リボフラビン酪酸エステルの固相における色調と化学構造に関する研究
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概要
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The relationship between the chemical structure and the color of riboflavin tetrabutylate (RTB) in the solid state was studied. The RTB of orange crystals obtained from methanol solvent and dark-yellow powders from isopropanol gave identical results in nuclear magnetic risonance, thin-layer chromatography and high performance liquid chromatography. The difference in emission spectra around 500-650 nm explained the color of RTB ; the orange crystals showed a maximum at 595 nm and the dark-yellow powders at 565nm, respectively. The reflection and exitation spectra also supported the difference in color between them. Powder X-ray diffraction showed that the crystal structure of orange RTB gave a pattern different from that of dark-yellow one. A strong electron spin resonance signal in dark-yellow RTB suggested the presence of charge-transfer complexes. Infrared spectra of RTB showed a difference in the hydrogen bond of NH which caused a change in the mode of the arrangement of RTB.
- 公益社団法人日本薬学会の論文
- 1987-05-25