- Characterization of typical potent odorants in raw and cooked Toona sinensis (A. Juss.) M. Roem. by instrumental-sensory analysis techniques
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Toona sinensis (A. Juss.) M. Roem. (TS) possesses a unique and pleasant flavor and is consumed as a popular seasonal vegetable in certain parts of eastern and southeastern Asia. The potent odorants in raw and cooked TS were identified by combined sensory and instrumental analysis techniques, including sensory descriptive aroma profiling and two complimentary volatile isolation methods combined with gas chromatography-olfactometry (GC-O) techniques. Highly volatile odorants were determined by static headspace dilution analysis (SHDA)-GC-O, while those of intermediate- and semi-volatility were determined by solvent-assisted flavor evaporation-aroma extract dilution analysis (SAFE-AEDA). Among the numerous odorants identified by SHDA and SAFE-AEDA, (E,E)-bis-(1-propenyl) disulfide was found to be predominant in both raw and cooked TS. In agreement with results of sensory descriptive analysis, hexanal, (Z)-3-hexenal, (E)-2-hexenal and (Z)-3-hexen-1-ol contributed green, grassy and leafy aroma notes; while hydrogen sulfide, methyl thiirane, (E,E)-bis-(1-propenyl) disulfide and (E,Z)-bis-(1-propenyl) disulfide contributed pungent, sulfurous and alliaceous notes in TS.
- Yang, Wenxi,Cadwallader, Keith R.,Liu, Yuping,Huang, Mingquan,Sun, Baoguo
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p. 153 - 163
(2019/01/26)
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- REACTION OF DIALLYL DISULFIDE WITH ACETYLENE IN THE SUPERBASIC POTASSIUM HYDROXIDE-DMSO SYSTEM
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1-Vinylthio-3-(1-propenylthio)-1-propene, vinyl 1-propenyl sulfide, and 1,2-bis(1-propenylthio)ethene were obtained by the reaction of diallyl disulfide with acetylene in the potassium hydroxide-DMSO system.The effect of the reaction conditions (temperature, time, amount of potassium hydroxide, inhibitors, and the concentration of water in the DMSO) on the yields of the products and the selectivity of the process was investigated.Diallyl sulfide, allyl 1-propenyl sulfide, and di(1-propenyl) sulfide were obtained as side products with an overall yield of about 6percent.
- Amosova, S. V.,Nosyreva, V. V.,Musorin, G. K.,Sigalov, M. V.
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p. 239 - 243
(2007/10/02)
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- Structure-Stability Relationships in Vinyl Sulfides. I. On the Stable Conformations of Vinyl Sulfides
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A thermodynamic and 13C NMR spectroscopic study of the structures of the less stable rotamers of alkyl vinyl sulfides have been performed.It has been shown that the less stable rotamer of methyl vinyl sulfide has the planar s-trans configuration and the proportion of this is about 20percent.The energy difference between the planar s-cis and s-trans is about 3.5 kJ mol-1.Ethyl vinyl sulfide is almost an equimolar mixture of the planar s-cis and s-trans conformations.The 13C NMR data showed that the p-? cojugation in the compounds that could not adopt any of the planar arrangements was decreased.In alkyl 1-propenyl sulfides, the stabilizing interaction between the methyl group and the S atom cis to each other was ca.1.8 kJ mol-1.The most probable choice for the most stable conformation of di-1-propenyl sulfides is the planar (or nearly planar) s-trans,s-trans one.
- Virtanen, Reijo
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p. 313 - 327
(2007/10/02)
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