Application of UPLC-QTOF-MS Technology in Quality Stability Evaluation of Moluodan Concentrated Pills

[Objectives]To use liquid chromatography-mass spectrometry technology to analyze the chemical composition of traditional Chinese medicine and explore its application in the evaluation of quality stability of traditional Chinese medicine.[Methods]Ultra performance liquid chromatography-quadrupole time-of-flight mass spectrometry(UPLC-QTOF-MS)was used to detect the samples of Moluodan concentrated pills.By comparing and analyzing the detection results of 10 different batches of Moluodan concentrated pills,combined with principal component analysis(PCA),the quality stability of Moluodan concentrated pills was evaluated.[Results]A total of 367 chemical components were identified in Moluodan concentrated pills.The average repetition rate of the chemical components contained in the 10 different batches of samples reached 92%.The overall quality stability of the Moluodan concentrated pills was good.[Conclusions]The UPLC-QTOF-MS technology combined with PCA provides a reference for the overall quality evaluation of Moluodan concentrated pills,and provides new detection methods and ideas for the analysis of the components of Chinese medicine.

地衣内生真菌Pestalotiopsis sp.次生代谢产物

拟盘多毛孢属Pestalotiopsis真菌由于能够产生大量结构新颖活性显著的次生代谢产物,特别是从中发现抗肿瘤药物紫杉醇,成为近年来研究的热点。本研究通过对1株地衣内生真菌Pestalotiopsis sp.的固体培养基次生代谢产物的UPLC-Q-TOF-MS分析,发现该菌株能够产生分子量比较特殊的两个色谱峰。通过进一步的菌株大量发酵,结合硅胶柱色谱,高效液相色谱等技术跟踪分离,得到了2个单体化合物。采用核磁共振波谱技术、质谱技术等方法确定这2个单体化合物平面结构,分别为已知torrenyanic acid衍生物(1)和新化合物pestalotiopsin(2)。比对化合物的CD谱及考虑生源关系,确定了新化合物(2)的绝对构型。化合物1和2的体外抑制人白血病细胞K562实验显示二者均具有抗肿瘤活性,IC50值分别为25.2和32.1μmol/L。