摘要
用傅里叶变换红外光谱研究了室温下聚酰胺／硅胶吸附剂（ Ｐ Ａ／ Ｓｉ Ｏ２）对茶叶中茶多酚的分离提取原理．红外光谱表明， Ｐ Ａ／ Ｓｉ Ｏ２ 中 Ｐ Ａ 分子的酰胺基－ Ｏ‖ Ｃ－ Ｎ Ｈ－ 是通过氢键吸附茶多酚分子的活性基团，而酰胺基对咖啡因分子没有吸附作用． Ｐ Ａ／ Ｓｉ Ｏ２ 中 Ｓｉ Ｏ２ 表面羟基 Ｏ Ｈ 是吸附咖啡因及茶多酚分子的活性基团．由于氢键的作用，茶多酚和咖啡因分子之间也能相互吸附． Ｐ Ａ／ Ｓｉ Ｏ２ 对氨基酸类物质不起吸附作用，因而容易将其分离．
The principle of tea polyphenol extracted by polyamide on silica adsorbent (PA/SiO 2) at room temperature was studied with FTIR Spectroscopy. The obtained IR spectra showed that the amide group C O NH- of the PA molecule of PA/SiO 2 adsorbed the active group of tea polyphenol molecule through hydrogen bonding and did not adsorb the caffeine molecule. The surface hydroxyl group on the SiO 2 of PA/SiO 2 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/SiO 2 and thus easily separated.
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
1999年第5期716-720,共5页
Journal of Xiamen University：Natural Science
基金
厦门市自然科学基金
关键词
茶多酚
红外光谱
聚酰胺
硅胶
吸附剂
分离
Tea polyphenol, Extraction, IR spectra, Caffeine, Polyamide, Silica
