title: Characterization of the major odor-active compounds in Thai durian ( Durio zibethinus L. 'Monthong') by aroma extract dilution analysis and headspace gas chromatography-olfactometry.
abstract: An aroma extract dilution analysis applied on the volatile fraction isolated from Thai durian by solvent extraction and solvent-assisted flavor evaporation resulted in 44 odor-active compounds in the flavor dilution (FD) factor range of 1-16384, 41 of which could be identified and 24 that had not been reported in durian before. High FD factors were found for ethyl (2S)-2-methylbutanoate (fruity; FD 16384), ethyl cinnamate (honey; FD 4096), and 1-(ethylsulfanyl)ethanethiol (roasted onion; FD 1024), followed by 1-(ethyldisulfanyl)-1-(ethylsulfanyl)ethane (sulfury, onion), 2(5)-ethyl-4-hydroxy-5(2)-methylfuran-3(2H)-one (caramel), 3-hydroxy-4,5-dimethylfuran-2(5H)-one (soup seasoning), ethyl 2-methylpropanoate (fruity), ethyl butanoate (fruity), 3-methylbut-2-ene-1-thiol (skunky), ethane-1,1-dithiol (sulfury, durian), 1-(methylsulfanyl)ethanethiol (roasted onion), 1-(ethylsulfanyl)propane-1-thiol (roasted onion), and 4-hydroxy-2,5-dimethylfuran-3(2H)-one (caramel). Among the highly volatile compounds screened by static headspace gas chromatography-olfactometry, hydrogen sulfide (rotten egg), acetaldehyde (fresh, fruity), methanethiol (rotten, cabbage), ethanethiol (rotten, onion), and propane-1-thiol (rotten, durian) were found as additional potent odor-active compounds. Fourteen of the 41 characterized durian odorants showed an alkane-1,1-dithiol, 1-(alkylsulfanyl)alkane-1-thiol, or 1,1-bis(alkylsulfanyl)alkane structure derived from acetaldehyde, propanal, hydrogen sulfide, and alkane-1-thiols. Among these, 1-(propylsulfanyl)ethanethiol, 1-{[1-(methylsulfanyl)ethyl]sulfanyl}ethanethiol, and 1-{[1-(ethylsulfanyl)ethyl]sulfanyl}ethanethiol were reported for the first time in a natural product.
authors.affiliation: Deutsche Forschungsanstalt für Lebensmittelchemie-German Research Center for Food Chemistry, Lise-Meitner-Strasse 34, 85354 Freising, Germany.
authors.forename: Jia-Xiao
authors.initials: JX
authors.lastname: Li
authors.forename: Peter
authors.initials: P
authors.lastname: Schieberle
authors.forename: Martin
authors.initials: M
authors.lastname: Steinhaus
mesh_terms: D035161:Bombacaceae / Q000737:chemistry*; D002849:Chromatography, Gas / Q000379:methods*; D004531:Eggs / Q000032:analysis; D005638:Fruit / Q000737:chemistry; D009812:Odorants / Q000032:analysis*; D010936:Plant Extracts / Q000032:analysis*; D013785:Thailand; D014675:Vegetables / Q000737:chemistry; D055549:Volatile Organic Compounds / Q000032:analysis*
chemical_list: D010936:Plant Extracts; D055549:Volatile Organic Compounds