Dynamic variation of glucosinolates and isothiocyanates in broccoli sprouts during hydrolysis

In this study, the glucosinolates (GLs) content and isothiocyanates (ITCs) formation in broccoli sprouts and their dynamic variation during hydrolysis were investigated. The results showed that 7 kinds of GLs were detected and glucoraphanin (GRA) was the dominating component. After hydrolysis, three kinds of ITCs and 2 kinds of nitriles were detected in broccoli sprouts, however, the corresponding nitriles of 4-isothiocyanato-1-butene and 1-isothiocyanato-butane were not detectable. This inferred that the inter-transformation among ITCs existed during sprouts hydrolysis. According to the identification, 4-isothiocyanato-1-butene had another source in addition to gluconapin (GNA), 1-isothiocyanato-butane stemmed from glucoerucin (GER). Moreover, the affinity of MYR in broccoli sprouts was stronger to GER than to GRA and other GLs.