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ÖйúͼÊé·ÖÀàºÅ¡¡O 657.33¡¡Q 949.758.4
IR Absorption Spectra of Tea Polyphenol Extracted by PA/SiO2
Lin Zhongyu¡¡Fu Jinkun¡¡Yang Ru¡¡Gu Pingying
(State Key Lab. for Phys. Chem. of Solid Surf., Inst. of Phys. Chem.,
Dept. of Chem., Xiamen Univ., Xiamen¡¡361005)
Abstract¡¡The principle of tea polyphenol extracted by polyamide on silica adsorbent (PA/SiO2) at room temperature was studied with FTIR Spectroscopy. The obtained IR spectra showed that the amide group CONH- of the PA molecule of PA/SiO2 adsorbed the active group of tea polyphenol molecule through hydrogen bonding and did not adsorb the caffeine molecule. The surface hydroxyl group on the SiO2 of PA/SiO2 was the reactive group which adsorbed caffeine and tea polyphend molecules, and the tea polyphenol and caffeine molecules can also adsorb each othe via hydrogen-bonding. Substances like amino acids were not adsorbed by PA/SiO2 and thus easily separated.
Key words¡¡Tea polyphenol, Extraction, IR spectra, Caffeine, Polyamide, Silica
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