Method for identifying three medicinal rhizoma polygonati varieties

The invention belongs to the technical field of quality control of traditional Chinese medicines, and particularly discloses a method for identifying three medicinal rhizoma polygonati varieties. The three medicinal rhizoma polygonati varieties comprise polygonatum kingianum, polygonatum cyrtonema and rhizoma polygonati. The method comprises the following steps: by taking a to-be-detected rhizoma polygonati root tuber as a sample, extracting the sample, and detecting metabolites in the sample by utilizing a liquid chromatography-mass spectrometry technology; comparing the characteristic metabolites with characteristic metabolites of polygonatum kingianum, polygonatum cyrtonema and polygonatum sibiricum, so as to identify the variety of polygonatum sibiricum; and when the detected metabolite in the sample belongs to the characteristic metabolite of a certain rhizoma polygonati variety, judging that the sample is the rhizoma polygonati variety corresponding to the characteristic metabolite. Scientific basis is