摘要
采用超高效液相色谱-四极杆静电场轨道阱高分辨质谱联用法(UPLC Orbitrap HRMS)对西洋参不同加工品中的皂苷类成分差异进行分析。高分辨质谱条件为电喷雾电离源,轨道阱质量分析器,负离子模式采集。结果显示,根据一级质谱精确质荷比信息,获得化合物的精确分子量;根据二级串联质谱信息,获得化合物的碎片信息。总结了不同类型皂苷的特征质谱碎裂规律,并对碎裂规律进行比对,初步归属和鉴定西洋参中55种皂苷类成分,其中原人参二醇型皂苷成分28种、原人参三醇型皂苷成分17种、奥克梯隆型皂苷成分5种和齐墩果烷型皂苷成分5种。通过比较不同西洋参加工品中皂苷类组成的差异,为揭示不同加工方法对西洋参皂苷成分的影响规律提供了依据,并为西洋参的开发利用以及阐明药效物质基础提供了参考。
An ultra-performance liquid chromatography-Q exactive orbitrap high resolution mass spectrometric( UPLC Orbitrap HRMS) method was utilized for the analysis of ginsenosides compositions in different processd Panax quinquefoliums L. roots. The electrospray ionization( ESI) ion source and orbitrap mass analyzer were equipped,and negative ion mode was used for data collection. On the basis of accurate mass to charge in MS,the accurate molecular weights of ginsenosides were acquired. Based on the second stage of tandem MS data,the fragmentations of ginsenosides were obtained. The characteristic MS fragmentation pathways of different types of ginsenosides were summarized. According to these fragmentation rules,55 ginsenosides in Panax quinquefoliums L. roots were identified,among which protopanaxdiol( PPD) type ginsenosides were 28, protopanaxtriol( PPT)type ginsenosides were 17,oleanane( OLE) type ginsenosides and ocotillol( OCO) type ginsenosides were both 5. The ginsenosides compositions of PPD,PPT,OCO and OLE types in different processd Panax quinquefoliums L. roots were compared. The results obtained provided the information for influences of different processing on ginsenosides composition of Panax quinquefoliums L. roots. The research also provided a reference for the exploitation and utilization of Panax quinquefoliums L. roots,and a clarification for its bio-effectiveness material basis.
引文
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