关键词: 玛咖, 玛咖酰胺, 指纹图谱, 化学计量学, 质量控制

Abstract: The liquid chromatography-mass spectrometric (LC-UV/MS) and standard chromatographic fingerprints of macamides in maca were established. Combined with chemometrics technology,the quality control of maca and maca-based products had been achieved using comparative analysis of components. Different regions of dried maca hypocotyls and dietary supplement tablets were used as samples,and the macamides were extracted by oscillations with petroleum ether. The extracts were analyzed using LC-MS,and the results indicated that a better separation of commom peaks was obtained in 40mins and nine of these peaks were identified as characteristic macamide peaks by mass data. The overall similarity among eight kinds of maca dried hypocotyls and dietary supplements was no less than 0.76,which indicated that varieties of macamides in all samples were similar. Principal component analysis was performed using the data of whole spectrum and characteristic peaks of macamides as input variables,respectively. The results indicated that using the data of characteristic peaks as input variables was the better choice for quality control of maca. All samples were divided into three categories on the basis of their real origins and types of samples; and three of nine characteristic peaks had greater effect on the quality control. This method has some merits such as stable,efficient and accurate,and it is suitable for the quality control and the origin identification of maca.

Key words: maca, macamide, fingerprint, chemometrics, quality control