HPLC测定银杏外种皮多糖的分子质量及含量

目的:建立银杏外种皮多糖的分子质量及含量的HPLC测定方法。方法:以葡聚糖为标样,采用HPLC法,PL aquagel-OH MIXED(7.5 mm×300 mm,8μm)色谱柱,柱温25℃,示差折光检测器,流动相为超纯水,流速1.0mL.min^-1。结果:银杏外种皮多糖的分子质量为11 062.5,RSD 0.78% (n=6);含量为68.7%,RSD 3.4%(n=6),葡聚糖(分子质量为12 000)在1~20μg呈良好线性关系(r=0.999 9),平均加样回收率为97.9%,RSD 2.5%。结论:本方法灵敏度高,操作简便,重复性好,可用于银杏外种皮多糖的分子质量和含量的测定。

Determination of molecular weight and content of Ginkgo biloba exocarp polysaccharides by HPLC

OBJECTIVE: To determine the molecular weight and content of Ginkgo biloba exocarp polysaccharides. METHOD: The analysis was carried on a PL aquagel-OH MIXED (7.5 mm x 300 mm, 8 microm) chromatography column eluted with water as mobile phase at 1.0 mL x min(-1) of flow rate, the column temperature was 25 degrees C and the eluate was detected by RID. RESULT: The average molecular weight of Ginkgo bilobaexocarp polysaccharides was 11 062.5 with RSD = 0.78% (n = 6); the content was 81.9% with RSD = 2.5% (n = 6), the standard curves of dextran (MW 12 000) were linear in the range of 1-20 microg, r = 0.999 9. The average recovery is 97.9%, RSD was 2.5%. CONCLUSION: This method was found to be sensitive and accurate for the measurement of Ginkgo biloba exocarp polysaccharides.