The purpose of this study was to analyze the difference of the main volatile components of Orah mandarin peels from four main producing areas, including Sichuan, Chongqing, Yunnan, and Guangxi and further provide the data support for the origin traceability and deep processing of Orah mandarin.Headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry was used to determine the volatile components.A total of 50 volatile components were identified, including 18 terpenes, 11 alcohols, 10 aldehydes, 8 esters, 1 ketone, and 2 other types.Limonene was the main volatile substance, followed by myrcene, α-pinene, linalool, n-octanol, n-octanal, citronellol, hexanal, trans-2-hexenal, sabinene, carvone, and α-terpineol, etc.Based on the semiquantitative data of volatile components, orthogonal partial least squares-discriminant analysis models were established for Sichuan and Chongqing, Yunnan and Guangxi Orah mandarin, and then potential biomarkers were screened.Results showed that limonene, linalool, and citronellol could be used as potential biomarkers to distinguish Chongqing from Sichuan, and octyl acetate and α-terpineol could be used as potential biomarkers to distinguish Guangxi from Yunnan.
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