Abstract:To clarify the volatile organic compounds in the essential oil of Citri grandis exocarpium, explore the key aroma components of the essential oil and establish the associated quality control standards, vapour distillation was used to extract the essential oil of Citri grandis exocarpium. Sensory evaluation, combined with electronic nose, gas chromatographymass spectrometry (GC-MS) and gas chromatography-mass spectrometry (GC-MS/O) analyses, was performed to clarify the key aroma components in Citri grandis exocarpium while assessing the pesticide residues. The results revealed that the main representative volatile flavors of Citri grandis exocarpium were found to be citrusy, sweet, medicinal, woody, and pungent, as determined via sensory evaluation. A total of 68 volatile organic compounds (VOCs) were detected in the essential oil of Citri grandis exocarpium by GC-MS, among which, the main VOCs, olefins, alcohols, and esters, accounted for 84.48%, 6.67%, and 6.05% of the total, respectively, with limonene, lauroylene and γ-pineole as the main VOCs. In combination with GC-MS/O, 15 key volatile characteristic aroma components were confirmed. In combination with the analysis of pesticide residues, it was clarified that the organochlorine pesticide residues in Citri grandis exocarpium essential oil under hydrodistillation extraction conformed to the standards specified in the Pharmacopoeia. The present study clearly elucidated the volatile organic composition and quality safety of the essential oil from Citri grandis exocarpium, which provides a reference for Citri grandis exocarpium product development and quality control.
