气相色谱法同时测定蟛蜞菊中的蟛蜞菊倍半萜内酯A和B

蟛蜞菊具有抗肿瘤、抗病毒作用,其主要活性成分是倍半萜内酯类物质。以分离纯化所得的结晶倍半萜内酯A与B为参考标准,采用HP毛细管色谱柱(30 m×0.25 mm i.d.× 0.25 μm),程序控制升温,氢火焰离子化检测器检测,测定了蟛蜞菊的地上部分（茎叶和花）中倍半萜内酯A与B的含量。测定结果表明:蟛蜞菊茎叶中的倍半萜内酯A和B的含量分别为（239±6.4） μg/g和（156±15） μg/g;花中倍半萜内酯A和B的含量分别为（233±6.5） μg/g和（173±16） μg/g。该法可用于蟛蜞菊原料及其药品的质量控制。

Simultaneous Determination of Trilobolide-6-O-Isobutyrates A and B in Wedelia trilobata by Gas Chromatography

A simple, sensitive, and specific gas chromatographic (GC) method was developed to determine the main bioactive sesquiterpene lactones, trilobolide-6-O-isobutyrates A and B (TBO-A and TBO-B), in Wedelia trilobata, a useful folk herb. A commercially available HP-5 capillary column (30 m x 0.25 mm i.d. x 0.25 microm) was utilized for the direct determination of TBO-A and TBO-B in W. trilobata. Calibration curves were obtained by spiking authentic compounds and the internal standard (ferulic acid) into W. trilobata samples before extraction. Extraction was carried out by refluxing the dried herb (0.5 g) for 1 h in methanol (25 mL). All calibration curves showed good linear regressions (r2 > 0.992) within test ranges. The assay was reproducible and accurate with the overall intraday and interday relative standard deviations and accuracies of less than 10% and more than 90%, respectively. The developed GC method was successfully utilized to analyze the TBO-A and TBO-B in aerial parts and flowers of W. trilobata, indicating that it was suitable for the quality control of this commonly used herb and related traditional Chinese medicines.