UPLC-Q-TOF/MS~E结合诊断离子过滤方法快速分析大黄中酚类成分

采用超高效液相色谱-串联四极杆飞行时间质谱(UPLC-Q-TOF/MS~E)结合诊断离子过滤方法对掌叶大黄中的酚类成分进行快速分析鉴定。首先,负离子模式下对酚类代表性单体没食子酸、(+)-儿茶素、(-)-表儿茶素、(-)-表儿茶素-3-O-没食子酸酯和原花青素B_2进行分析,综合文献报道,总结质谱裂解途径,确定诊断离子;然后,应用诊断离子过滤快速筛选掌叶大黄提取液中的酚类成分,结合保留时间、质谱碎片信息、裂解行为和精确质量数(计算分子式)对化合物进行结构鉴定。在掌叶大黄中共鉴定了63个酚类成分(36个简单酚酸类化合物、8个类黄酮类化合物和19个鞣质类化合物),其中包括6个潜在的新化合物。诊断离子过滤方法可对大黄中酚类成分进行快速分析,并完善了中药大黄的药效物质基础。

Rapid analysis on phenolic compounds in Rheum palmatum based on UPLC-Q-TOF/MSE combined with diagnostic ions filter

Diagnostic ions filter method was used to rapidly detect and identify the phenolic compounds in Rheum palmatum based on ultra performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF/MS^E). The representative authentic standards of phenolic compounds, including gallic acid, (+)-catechin, (-)-epicatechin, (-)-epicatechin-3-O-gallate and procyanidin B₂, were subjected to analysis by UPLC-Q-TOF/MS^E system with negative ion mode. Fragmentation patterns of each standard were summarized based on assigned fragment ions. The prominent product ions were selected as diagnostic ions. Subsequently, diagnostic ions filter was employed to rapidly recognize analogous skeletons. Combined with retention time, accurate mass, characteristic fragments and previous literature data, the structures of the filtered compounds were identified or tentatively characterized. A total 63 phenolic compounds (36 phenolic acid derivatives, 8 flavonoid derivatives and 19 tennis derivatives) in R. palmatum were identified, including 6 potential new compounds. The method of diagnostic ions filter could rapidly detect and identify phenolic compounds in R. palmatum This study provides a method for rapid detection of phenolic compounds in R. palmatum and is expected to complete the material basis of rhubarb.