Quality Evaluation of Tangerine Peel Volatile Oils from Different Origins by GC-MS Fingerprint and PCA
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Abstract:
The chromatographic fingerprints of 22 types of tangerine peel volatile oils from eight different regions were established by gas chromatography-mass spectrometry (GC-MS) in this study. Seven volatile components (L-α-pinene, β-pinene, β-myrcene, o-cymene, D-limonene, terpinene, and terpinolene) were identified as common characteristic peaks. These seven identified peaks and some trace elements were used as the data sources for principal component analysis (PCA). PCA and semblance analysis methods were applied to assess similarities and differences among 22 types of tangerine peel volatile oils. The results showed that the similarities of the oils ranged between 0.886~1. The samples from Sihui, Szechwan, Nanfeng, Xinhui, and Guiling were well distinguished, and the samples from Yunfu, Wuzhou, and Qingyuan were grouped in one cluster. The L-α-pinene, α-farnesene, and β-pinene common characteristic peaks and germacrene from the trace composition in the fingerprints were determined as the principal components with a significant contribution. The changes in the content of the main components could be used to distinguish the origin of the samples, and this study provides guidance for the overall quality control of tangerine peel volatile oils and the quality evaluation of their preparation.
