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J Agric Food Chem

Title:		Identification of Light-Induced Key Off-Flavors in Ponkan Mandarin Juice Using MDGC-MS/O and GC-MS/PFPD
Author(s):		Cheng Y; Li G; Wu H; Huang L; Wang H;
Address:		"Citrus Research Institute, Southwest University, Chongqing 400712, China. National Citrus Engineering Research Center, Chinese Academy of Agricultural Sciences, Chongqing 400712, China"
Journal Title:		J Agric Food Chem
Year:		2021
Volume:		20211116
Issue:		47
Page Number:		14259 - 14269
DOI:		10.1021/acs.jafc.1c05465
ISSN/ISBN:		1520-5118 (Electronic) 0021-8561 (Linking)
Abstract:		"Light-induced off-flavor compounds in Ponkan mandarin juice were investigated during its shelf-life by headspace solid-phase microextraction multidimensional gas chromatography-mass spectrometry/olfactometry (MDGC-MS/O) and a GC-MS/pulsed flame photometric detector (GC-MS/PFPD). A total of 34 aroma-active compounds with flavor dilution (FD) factors from 2 to 128 were tentatively identified by aroma extract dilution analysis-MDGC-MS/O. Among them, a light-induced off-flavor compound with a high FD factor, methional (cooked potato), was positively identified in the Ponkan mandarin juice at the end of the shelf-life. In addition, 11 volatile sulfur compounds (VSCs), including 6 screened shelf-markers (variable identification, VID > 0.80), were identified in Ponkan mandarin juice by a sulfur detector (PFPD). Four VSCs exhibited odor activity values exceeding 1. Three VSCs (methanethiol, dimethyl trisulfide, and methional) were confirmed as key light-induced off-flavor compounds in Ponkan mandarin juice based on addition/omission experiments. Furthermore, light irradiation accelerated the degradation of sulfur precursors (methionine and MMS) and the formation of these VSCs leading to an increase in off-flavor intensity"
Keywords:		Flavoring Agents Gas Chromatography-Mass Spectrometry Odorants/analysis Olfactometry *Volatile Organic Compounds/analysis Ponkan mandarin juice aroma extract dilution analysis light irradiation off-flavor omission/addition experiments;
Notes:		"MedlineCheng, Yujiao Li, Guijie Wu, Houjiu Huang, Linhua Wang, Hua eng 2021/11/17 J Agric Food Chem. 2021 Dec 1; 69(47):14259-14269. doi: 10.1021/acs.jafc.1c05465. Epub 2021 Nov 16"