title: Dimethyl sulfide as a source of the seaweed-like aroma in cooked soybeans and correlation with its precursor, S-methylmethionine (vitamin U).
abstract: Among the soybean germplasm in Japan, two varieties, Nishiyamahitashi 98-5 (NH) and Shinanokurakake (SKK), have an intense seaweed-like flavor after cooking. Gas-liquid chromatography with mass spectrometry (GC-MS) indicated that a significant amount (11.5 ± 3.46 μg g(-1) for NH and 6.66 ± 0.91 μg g(-1) for SKK) of dimethyl sulfide (DMS) was formed after heat treatment. DMS is formed from S-methylmethionine (SMM, vitamin U). SMM was detected in all soybean varieties examined here, but its concentration in NH and SKK seeds was >100-fold higher than in the other varieties and ranged from 75 to 290 μg g(-1). The SMM content and the ability to form DMS upon heat treatment correlated among them. The plumes and radicles contained SMM exclusively. This is the first report of soybean varieties containing SMM at a level equivalent to or higher than that in vegetables known to contain high levels of SMM, for example, turnip, cabbage, and celery.
authors.affiliation: Graduate School of Medicine (Agriculture) and Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University , Yamaguchi 753-8515, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Morisaki
authors.forename: Naohiro
authors.initials: N
authors.lastname: Yamada
authors.forename: Shiori
authors.initials: S
authors.lastname: Yamanaka
authors.forename: Kenji
authors.initials: K
authors.lastname: Matsui
mesh_terms: D003296:Cooking; D005421:Flavoring Agents / Q000032:analysis*; D007564:Japan; D012639:Seeds / Q000737:chemistry; D013025:Glycine max / Q000737:chemistry* / Q000145:classification; D013440:Sulfides / Q000032:analysis*; D014814:Vitamin U / Q000032:analysis*
chemical_list: D005421:Flavoring Agents; D013440:Sulfides; D014814:Vitamin U; C004784:dimethyl sulfide
keywords: S-methylmethionine; dimethyl sulfide; flavor; soybean