engleski

Glucosinolates of Croatian wild-growing Brassicaceae plants

Glucosinolates, group of phytochemicals particularly abundant in plants belonging to Brassicaceae family, are interesting as a source of volatile degradation products possessing various biological activities. Besides commercial plants, such as vegetables and oilseeds crops, numerous wild-growing Brassicaceae plants could serve as a source of these compounds. As a part of an investigation of glucosinolate degradation products and, indirectly, glucosinolates from Croatian wild-growing Brassicaceae plants, five plants, Aurinia leucadea, Cardaria draba, Capsella rubella, Calepina irregularis and Bunias erucago, were investigated. Regarding glucosinolates, these plants are unexplored or insufficiently explored and literature data about glucosinolate degradation products and glucosinolates are rather limited. In this study, indirect method consisting of thermal degradation of glucosinolates followed by GC-MS analysis of liberated volatile degradation products was used. Hydrodistillation was chosen as suitable isolation method because it insures simultaneous thermal degradation of glucosinolates and isolation of the liberated volatile degradation products. The identification of volatile products isolated from Aurinia leucadea revealed the presence of nine glucosinolates. The main glucosinolates were glucobrassicanapin and gluconapin, followed by glucoberteroin, glucotropaeolin, glucolepidiin and glucojiabutin. The dominating glucosinolate found in Cardaria draba was glucoerucin, while iso-butyl glucosinolate and glucoiberverin were present in much smaller amounts. Among eight glucosinolates identified in Capsella rubella, the main one was sinigrin. Other interesting glucosinolates identified in this plant were 9-(methylthio)nonyl glucosinolate and 10-(methylthio)decyl glucosinolate. Calepina irregularis contained four glucosinolates, namely glucoiberverin, glucoerucin, sinigrin and glucotropaeolin. The dominating glucosinolate in this plant was glucoiberverin. Bunias erucago was found to contain glucodehidroerucin and glucoerucin as the most abundant compounds, plus gluconapin, hexyl glucosinolate, glucojiabutin, glucotropaeolin, glucolepidiin and glucosinalbin.

glucosinolate degradation products; glucosinolates; Brassicaceae plants

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