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J Agric Food Chem

Title:		Characterization of the key aroma compounds in pink guava (Psidium guajava L.) by means of aroma re-engineering experiments and omission tests
Author(s):		Steinhaus M; Sinuco D; Polster J; Osorio C; Schieberle P;
Address:		"Deutsche Forschungsanstalt fur Lebensmittelchemie, Lichtenbergstrasse 4, D-85748 Garching, Germany"
Journal Title:		J Agric Food Chem
Year:		2009
Volume:		57
Issue:		7
Page Number:		2882 - 2888
DOI:		10.1021/jf803728n
ISSN/ISBN:		1520-5118 (Electronic) 0021-8561 (Linking)
Abstract:		"Seventeen aroma-active volatiles, previously identified with high flavor dilution factors in fresh, pink Colombian guavas (Psidium guajava L.), were quantified by stable isotope dilution assays. On the basis of the quantitative data and odor thresholds in water, odor activity values (OAV; ratio of concentration to odor threshold) were calculated. High OAVs were determined for the green, grassy smelling (Z)-3-hexenal and the grapefruit-like smelling 3-sulfanyl-1-hexanol followed by 3-sulfanylhexyl acetate (black currant-like), hexanal (green, grassy), ethyl butanoate (fruity), acetaldehyde (fresh, pungent), trans-4,5-epoxy-(E)-2-decenal (metallic), 4-hydroxy-2,5-dimethyl-3(2H)-furanone (caramel, sweet), cinnamyl alcohol (floral), methyl (2S,3S)-2-hydroxy-3-methylpentanoate (fruity), cinnamyl acetate (floral), methional (cooked potato-like), and 3-hydroxy-4,5-dimethyl-2(5H)-furanone (seasoning-like). Studies on the time course of odorant formation in guava puree or cubes, respectively, showed that (Z)-3-hexenal was hardly present in the intact fruits, but was formed very quickly during crushing. The aroma of fresh guava fruit cubes, which showed a very balanced aroma profile, was successfully mimicked in a reconstitute consisting of 13 odorants in their naturally occurring concentrations. Omission tests, in which single odorants were omitted from the entire aroma reconstitute, revealed (Z)-3-hexenal, 3-sulfanyl-1-hexanol, 4-hydroxy-2,5-dimethyl-3(2H)-furanone, 3-sulfanylhexyl acetate, hexanal, ethyl butanoate, cinnamyl acetate, and methional as the key aroma compounds of pink guavas"
Keywords:		Acetaldehyde/analysis Fruit/*chemistry Gas Chromatography-Mass Spectrometry Hexobarbital/analysis Humans Indicator Dilution Techniques Isotope Labeling Odorants/*analysis Psidium/*chemistry Smell;
Notes:		"MedlineSteinhaus, Martin Sinuco, Diana Polster, Johannes Osorio, Coralia Schieberle, Peter eng Research Support, Non-U.S. Gov't 2009/03/04 J Agric Food Chem. 2009 Apr 8; 57(7):2882-8. doi: 10.1021/jf803728n"