Retention behavior of ginsenosides in a sulfo-based high performance liquid chromatography column

Synthesis and evaluation of ginsenosides imprinted polymer-based chromatographic stationary phase

The molecular imprinting technique has aroused great interest in preparing novel stationary phases, and the resulting materials named molecularly imprinted polymers coated silica packing materials exhibit good performance in separating diverse analytes based on their good characteristics (including high selectivity, simple synthesis, and good chemical stability). To date, mono-template is commonly used in synthesizing molecularly imprinted polymers-based stationary phases. The resulting materials always own the disadvantages of low column efficiency and restricted analytes, and the price of ginsenosides with high purity was very high. In this study, to overcome the weaknesses of molecularly imprinted polymers-based stationary phases mentioned above, the multi-templates (total saponins of folium ginseng) strategy was used to prepare ginsenosides imprinted polymer-based stationary phase. The resulting ginsenosides imprinted polymer-coated silica stationary phase has a good spherical shape and suitable pore structures. Additionally, the total saponins of folium ginseng were cheaper than other kinds of ginsenosides. Moreover, the ginsenosides imprinted polymer-coated silica stationary phase-packed column performed well in the separation of ginsenosides, nucleosides, and sulfonamides. The ginsenosides imprinted polymer-coated silica stationary phase possesses good reproducibility, repeatability, and stability for seven days. Therefore, a multi-templates strategy for synthesizing the ginsenosides imprinted polymer-coated silica stationary phase is considered in the future.

[Determination of nine ginsenosides in health foods by solid extraction phase-ultra performance liquid chromatography-tandem mass spectrometry]

建立了以固相萃取结合超高效液相色谱-串联质谱(UPLC-MS/MS)同时检测保健食品中9种原人参二醇型和原人参三醇型人参皂苷的方法。保健食品中人参皂苷经过提取后,通过Alumina-N/XAD-2 SPE柱净化,在Hypersil Gold C18色谱柱(100 mm×2.1 mm, 1.9 μm)上分离,利用乙酸铵溶液(含0.1%甲酸)和乙腈作为流动相进行梯度洗脱,采用负离子扫描,多反应监测模式测定,外标法定量。研究通过对不同填料的固相萃取小柱的考察,最终选择了Alumina-N/XAD-2复合填料,其能对保健食品复杂基质中的人参皂苷进行有效富集和净化;通过考察人参皂苷的电离裂解过程,确定人参皂苷一级质谱准分子离子和相应的碎片离子,并经过色谱条件的优化,使质谱条件下一级质谱准分子离子和相应的碎片离子均一致的3种原人参二醇型人参皂苷Rb2、Rb3、Rc同分异构体实现完全分离。结果表明,9种人参皂苷在0.005~0.5 μg/mL范围内具有很好的线性关系,相关系数均大于0.9950。方法的加标回收率为81.1%~114.2%,相对标准偏差为0.4%~8.0%。所建立的方法采用XAD-2大孔吸附树脂和中性氧化铝的复合固相萃取材料,保健食品经过简单提取可直接作为固相萃取的上样溶液进行人参皂苷的富集和净化,通过超高效液相色谱-串联质谱不仅缩短了分析时间,也能对复杂基质样品中含量相对较低的人参皂苷进行准确定性和定量。该方法通量高,简单快速,重复性好,适用于保健食品中9种人参皂苷的定性和定量分析。