A polysaccharide of Thea sinensis, TSA, has been isolated from the fresh leaves as a major fraction of polysaccharides. The mol. wt. was estimated to be 850,000 with [α]_D^(15)+ 25.5°(c=0.75, H_2O). The componen...A polysaccharide of Thea sinensis, TSA, has been isolated from the fresh leaves as a major fraction of polysaccharides. The mol. wt. was estimated to be 850,000 with [α]_D^(15)+ 25.5°(c=0.75, H_2O). The component sugars were determined as L-rhamnose, L-arabinose, and D-galactose in molar ratio of 0.54: 1.0: 0.94. The O-acetyl groups locating on galactose residues position 2 were also iden- tified and the content was 3.8％. The ^(13)C NMR spectrum and CrO_3 oxidation of TSA indicated the Rhamnose, Arabinose and Galactose to be in α-, α- and β-configurations, respectively. Me- thylation analysis, periodate oxidation, partial hydrolysis and ^(13) C NMR. spectrum showed that TSA. is a branched galactoarabinan.展开更多
连续两年用纸色谱、分光光度法、区带纸电泳—薄层扫描法及 HPLC 法测定了张氏系统中的21种茶组植物新梢中的咖啡碱、可可碱、儿茶素组成、茶氨酸、游离氨基酸总量及幼果中的哌啶-2-羧酸。根据化学、形态学及植物的地理分布等证据,采用...连续两年用纸色谱、分光光度法、区带纸电泳—薄层扫描法及 HPLC 法测定了张氏系统中的21种茶组植物新梢中的咖啡碱、可可碱、儿茶素组成、茶氨酸、游离氨基酸总量及幼果中的哌啶-2-羧酸。根据化学、形态学及植物的地理分布等证据,采用化学分类和数值分类学方法探讨了茶组植物种群的归属和分类。分类结果表明,茶组可分为五室茶 C.quinquelocularea Du et Li.和三室茶 C.trilo cularea Du et Li.两个种。三室茶具有中小叶茶 C.var.micro-midph-yllaea Du et Li.大叶茶 C.macrophyllaea Du et Li.和苦茶 C.var.kuiea Du et Li.3个变种。展开更多
文摘A polysaccharide of Thea sinensis, TSA, has been isolated from the fresh leaves as a major fraction of polysaccharides. The mol. wt. was estimated to be 850,000 with [α]_D^(15)+ 25.5°(c=0.75, H_2O). The component sugars were determined as L-rhamnose, L-arabinose, and D-galactose in molar ratio of 0.54: 1.0: 0.94. The O-acetyl groups locating on galactose residues position 2 were also iden- tified and the content was 3.8％. The ^(13)C NMR spectrum and CrO_3 oxidation of TSA indicated the Rhamnose, Arabinose and Galactose to be in α-, α- and β-configurations, respectively. Me- thylation analysis, periodate oxidation, partial hydrolysis and ^(13) C NMR. spectrum showed that TSA. is a branched galactoarabinan.
文摘连续两年用纸色谱、分光光度法、区带纸电泳—薄层扫描法及 HPLC 法测定了张氏系统中的21种茶组植物新梢中的咖啡碱、可可碱、儿茶素组成、茶氨酸、游离氨基酸总量及幼果中的哌啶-2-羧酸。根据化学、形态学及植物的地理分布等证据,采用化学分类和数值分类学方法探讨了茶组植物种群的归属和分类。分类结果表明,茶组可分为五室茶 C.quinquelocularea Du et Li.和三室茶 C.trilo cularea Du et Li.两个种。三室茶具有中小叶茶 C.var.micro-midph-yllaea Du et Li.大叶茶 C.macrophyllaea Du et Li.和苦茶 C.var.kuiea Du et Li.3个变种。
