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Nat Prod Res

Title:		"Identification of volatile components in yak butter using SAFE, SDE and HS-SPME-GC/MS"
Author(s):		Li N; Sun BG; Zheng FP; Chen HT; Liu SY; Gu C; Song ZY;
Address:		"College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi, PR China"
Journal Title:		Nat Prod Res
Year:		2012
Volume:		20111024
Issue:		8
Page Number:		778 - 784
DOI:		10.1080/14786419.2011.561492
ISSN/ISBN:		1478-6427 (Electronic) 1478-6419 (Linking)
Abstract:		"The volatile components of yak butter were isolated by solvent-assisted flavour evaporation (SAFE), simultaneous distillation extraction (SDE; dichloromethane and diethyl ether as solvent, respectively) and headspace solid-phase microextraction (HS-SPME; CAR/PDMS, PDMS/DVB and DVB/CAR/PDMS fibre extraction, respectively) and were analysed by GC/MS. A total of 83 volatile components were identified under six different conditions, including 28 acids, 12 esters, 11 ketones, 10 lactones, 10 alcohols, 4 other compounds, 2 aldehydes, 2 unsaturated aldehydes, 1 furan, 1 sulphur-containing compound, 1 unsaturated alcohol and 1 unsatruated ketone. Among them, 51 were identified by SAFE, 58 by SDE (45 with dichloromethane as solvent and 41 with diethyl ether as solvent) and 40 by HS-SPME (26 with CAR/PDMS; 26 with PDMS/DVB and 32 with DVB/CAR/PDMS). Three pretreatment methods were compared to show that the volatile components obtained using different methods varied greatly, both in terms of categories and in content. Therefore, a multi-pretreatment method should be adopted, together with GC/MS. A total of 25 aroma-active compounds were detected by gas chromatography-olfactometry, among which 20 aroma-active compounds were found by SDE (14 with dichloromethane as solvent and 14 with diethyl ether as solvent) and 17 by SAFE"
Keywords:		Animals Butter/*analysis *Cattle Gas Chromatography-Mass Spectrometry Odorants Volatile Organic Compounds/*analysis;
Notes:		"MedlineLi, Ning Sun, Bao-Guo Zheng, Fu-Ping Chen, Hai-Tao Liu, Si-Yuan Gu, Chen Song, Zhen-Yang eng Research Support, Non-U.S. Gov't England 2011/10/25 Nat Prod Res. 2012; 26(8):778-84. doi: 10.1080/14786419.2011.561492. Epub 2011 Oct 24"