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J Agric Food Chem

Title:		Comparison of three lychee cultivar odor profiles using gas chromatography-olfactometry and gas chromatography-sulfur detection
Author(s):		Mahattanatawee K; Perez-Cacho PR; Davenport T; Rouseff R;
Address:		"Institute of Food and Agricultural Sciences, Citrus Research and Education Center, University of Florida, 700 Experiment Station Road, Lake Alfred, Florida 33850, USA"
Journal Title:		J Agric Food Chem
Year:		2007
Volume:		20070201
Issue:		5
Page Number:		1939 - 1944
DOI:		10.1021/jf062925p
ISSN/ISBN:		0021-8561 (Print) 0021-8561 (Linking)
Abstract:		"Odor volatiles in three major lychee cultivars (Mauritius, Brewster, and Hak Ip) were examined using gas chromatography-olfactometry, gas chromatography-mass spectrometry, and gas chromatography-pulsed flame photometric detection. Fifty-nine odor-active compounds were observed including 11 peaks, which were associated with sulfur detector responses. Eight sulfur volatiles were identified as follows: hydrogen sulfide, dimethyl sulfide, diethyl disulfide, 2-acetyl-2-thiazoline, 2-methyl thiazole, 2,4-dithiopentane, dimethyl trisulfide, and methional. Mauritius contained 25% and Brewster contained 81% as much total sulfur volatiles as Hak Ip. Cultivars were evaluated using eight odor attributes: floral, honey, green/woody, tropical fruit, peach/apricot, citrus, cabbage, and garlic. Major odor differences in cabbage and garlic attributes correlated with cultivar sulfur volatile composition. The 24 odor volatiles common to all three cultivars were acetaldehyde, ethanol, ethyl-3-methylbutanoate, diethyl disulfide, 2-methyl thiazole, 1-octen-3-one, cis-rose oxide, hexanol, dimethyl trisulfide, alpha-thujone, methional, 2-ethyl hexanol, citronellal, (E)-2-nonenal, linalool, octanol, (E,Z)-2,6-nonadienal, menthol, 2-acetyl-2-thiazoline, (E,E)-2,4-nonadienal, beta-damascenone, 2-phenylethanol, beta-ionone, and 4-vinyl-guaiacol"
Keywords:		"Chromatography, Gas Female Flame Ionization Fruit/*chemistry Gas Chromatography-Mass Spectrometry Humans Litchi/*chemistry Male Odorants/*analysis Smell Sulfur Compounds/analysis Volatilization;"
Notes:		"MedlineMahattanatawee, Kanjana Perez-Cacho, Pilar Ruiz Davenport, Thomas Rouseff, Russell eng Comparative Study Research Support, Non-U.S. Gov't 2007/02/03 J Agric Food Chem. 2007 Mar 7; 55(5):1939-44. doi: 10.1021/jf062925p. Epub 2007 Feb 1"