采用高分辨离子淌度液质联用技术,分析鉴定中药紫苏茎叶中的主要化学成分,为紫苏资源的开发及临床应用提供依据.采用色谱柱为HSS T3 (2.1×100 mm,1.8μm),运用色谱梯度洗脱溶剂A:水(0.1%甲酸)和B:乙腈(0.1%甲酸),操作条件为:流速0....采用高分辨离子淌度液质联用技术,分析鉴定中药紫苏茎叶中的主要化学成分,为紫苏资源的开发及临床应用提供依据.采用色谱柱为HSS T3 (2.1×100 mm,1.8μm),运用色谱梯度洗脱溶剂A:水(0.1%甲酸)和B:乙腈(0.1%甲酸),操作条件为:流速0.45 mL·min^(-1),柱温30℃,进样体积1μL;通过质谱仪(SYNAPT G2-Si HD英国,沃特世)的高能量质谱碎片信息,参照数据库和文献资料从紫苏茎叶中鉴定10种化合物,包括6种黄酮及其苷类成分(芹菜素6,8-二葡萄糖苷、木樨草素-7-氧-二葡萄糖醛酸苷、山奈酚3-葡萄糖醛酸-7-葡萄糖苷、芹菜素-7-氧-二葡萄糖醛酸、山奈酚-3-O-D-吡喃葡萄糖醛酸糖苷、芹菜素-7-氧-葡萄糖醛酸苷),以及4种有机酸类(咖啡酸、咖啡酸四聚体、迷迭香酸、葵二酸).展开更多
High performance liquid chromatography coupled with quadruple-time-of-flight mass spectrometry(HPLC-Q-TOF-MS)method was developed for analyzing the hydrolytic mixtures of ginsenoside R_(g1) in acidic conditions(pH 3)....High performance liquid chromatography coupled with quadruple-time-of-flight mass spectrometry(HPLC-Q-TOF-MS)method was developed for analyzing the hydrolytic mixtures of ginsenoside R_(g1) in acidic conditions(pH 3). Three catalysts, a heteropolyacid(H_4SiW_(12)O_(40), SiW_(12) for short), its complex with γ-CD(SiW_(12)/γ-CD for short) and formic acid, were used for comparison. The chemical transformation products were identified based on the accurate mass measurement and the fragment ions obtained from tandem mass spectrometry. It was concluded that the catalytic efficiency of SiW_(12)(≈SiW_(12)/γ-CD) is ca. 410 times higher than that of formic acid, thus becoming the most efficient catalyst for chemical transformations of ginsenosides.展开更多
基金supported by the National Natural Science Foundation of China(21371025),the 111 Project(B07012)the degree and postgraduate education development research project(YJYJG2015B07)by Beijing Institute of Technology
文摘High performance liquid chromatography coupled with quadruple-time-of-flight mass spectrometry(HPLC-Q-TOF-MS)method was developed for analyzing the hydrolytic mixtures of ginsenoside R_(g1) in acidic conditions(pH 3). Three catalysts, a heteropolyacid(H_4SiW_(12)O_(40), SiW_(12) for short), its complex with γ-CD(SiW_(12)/γ-CD for short) and formic acid, were used for comparison. The chemical transformation products were identified based on the accurate mass measurement and the fragment ions obtained from tandem mass spectrometry. It was concluded that the catalytic efficiency of SiW_(12)(≈SiW_(12)/γ-CD) is ca. 410 times higher than that of formic acid, thus becoming the most efficient catalyst for chemical transformations of ginsenosides.
