藏药印度獐牙菜化学成分的UPLC-ESI-Q-TOFMS分析

摘要

采用超高效液相色谱‐电喷雾四极杆飞行时间质谱（UPLC‐ESI‐Q‐TOF MS）技术对印度獐牙菜的化学成分进行定性分析。选取Acquity HSS T3色谱柱（2.1 mm ×100 mm ，1.8μm），用含0.1％甲酸的乙腈‐水（含0.1％甲酸）溶液作为流动相进行梯度洗脱。采用ESI离子源，在正、负离子模式下扫描，通过对精确质谱信息及元素组成的分析，结合Scifinder数据库、相关文献和对照品信息，共鉴定出24个化学成分，包括6个环烯醚萜、11个口山酮、2个黄酮、2个异香豆素、2个酚类及1个三萜。其中，马钱苷酸、异芒果苷、红白金花酸、苦当药酯苷、3‐氧去甲双口山酮苷和鸢尾酚酮等6种化合物为首次从该药材中发现。结果表明，UPLC‐ESI‐Q‐TOF MS技术可快速、灵敏地鉴定印度獐牙菜中的化学成分，可为有效控制该药材质量，阐明该药的药效物质基础提供实验依据。%A method was developed to analyze and identify the chemical constituents of Swertia chirayita by ultra‐performance liquid chromatography‐electrospray ionization quadrupole time‐of‐flight mass spectrometry (UPLC‐ESI‐Q‐TOF MS) .After extracted by methanol ,the sample was separated on an Acquity HSS T 3 reverse phase column (2.1 mm × 100 mm ,1.8 μm) with the gradient elution of 0.1% formic acid in ACN and 0.1% formic acid in water as mobile phases ,and the flow rate was 0.4 mL/min .The electrospray ionization (ESI) source in positive or negative ion mode was used for multi‐ple reaction monitoring (MRM ) mode .The results indicated that 24 compounds from the ethanol extract of Swertia chirayita are identified ,including six iridoids ,eleven xanthones ,two flavonoids ,two isocoumarins ,two phenols and one terpenoid ,by direct comparison with both positive and negative ion mass data , the element compositions analysis ,the data base of Scifinder ,standards and literatures .Six of these compounds are found from this specie for the first time , including loganic acid , isomangiferin , erythrocentauric acid ,amaroswerin ,3‐O‐demethylswertipunicoside and iriflophenone . This method is rapid ,simple ,sensitive ,which can provide the reference for evaluation of the quality of the Swertia chirayita and clarifying the material basis .