芦笋中化学成分的内部萃取电喷雾电离质谱检测

选择芦笋(Asparagus Officinalis L)新鲜茎块和两种干燥茎块为代表性植物组织样品,建立了一种直接检测芦笋中多种化学成分的内部萃取电喷雾电离质谱(iEESI-MS)分析方法。在正离子检测模式下,选择甲醇(CH₃OH)作萃取溶剂,在无需样品预处理的条件下对芦笋组织样品进行直接质谱分析,获得了组织样品在m/z 50~1000范围内的化学指纹谱图,并通过目标离子的碰撞诱导解离(CID)实验,鉴定了对药物和自然产品研发具有重要意义的糖类、氨基酸、生物碱以及芦丁等多种代表性的营养成分。 本方法具有无需样品预处理、样品耗量少、操作简便、分析速度快(单个样品的分析时间少于1 min)等优点,为食源性植物组织样品的快速分析提供了一种质谱分析新方法。

Rapid Analysis of Chemical Composition in Asparagus Using Internal Extractive Electrospray Ionization Mass Spectrometry

Rapid analysis chemical composition of plant samples was achieved using internal extractive electrospray ionization mass spectrometry(iEESI-MS) without any sample pretreatment. In this study, fresh asparagus tubers together with two kinds of dry asparagus tubers were treated as representative samples for the iEESI-MS analysis. Choosing methanol as an iEESI extractant, various chemical composition in asparagus tissue samples was profiled in mass scan range of m/z 50~1000 under the positive ion detection mode, and through collision-induced dissociation(CID) experiments, nutrient and medicinal components including sugars, amino acids, alkaloids, and rutin were identified, which play an significant role in development of pharmaceutical drugs, natural product research and understanding of primary and secondary metabolites. Our experimental results demonstrate that iEESI-MS makes rapid recognition of chemical composition differences in different asparagus. Such information renders the nutritious and medicinal assessment of plant natural products possible. The merits of iEESI-MS include no sample pretreatment, high-throughput(less than 1 min per sample), low sample consumption, simplicity, as well as good specificity, showing potential applications in phytochemicals analysis.