Every grape cultivar has its own unique genetic characteristics, leading to the production of a different secondary metabolite profile. Aroma is one of the most important aspects in terms of the quality of grapes and previous studies have assigned specific aromas to particular grape cultivars. In this study we present the molecular profiling of volatile aroma metabolites and their precursors in ten selected genotypes, including six Vitis vinifera cultivars, two American species (Arizonica Texas, Vitis cinerea) and two interspecific crosses. Chemical profiling was achieved through combined use of two orthogonal techniques, GC–MS and LC–HRMS, before and after enzymatic hydrolysis. The results show that both free and glycosidically bound aroma precursors behave differently in each different grape cultivar and species. As many as 66 free aroma volatile molecules (originally existing and released after hydrolysis) were profiled through GC–MS analysis, while 15 glycosylated precursors of volatiles were identified through LC–HRMS and correlation with GC–MS data

Ghaste, M.S.; Narduzzi, L.; Carlin, S.; Vrhovsek, U.; Shulaev, V.; Mattivi, F. (2015). Chemical composition of volatile aroma metabolites and their glycosylated precursors that can uniquely differentiate individual grape cultivars. FOOD CHEMISTRY, 188 (1): 309-319. doi: 10.1016/j.foodchem.2015.04.056 handle: http://hdl.handle.net/10449/25191

Chemical composition of volatile aroma metabolites and their glycosylated precursors that can uniquely differentiate individual grape cultivars

Ghaste, Manoj Shahaji;Narduzzi, Luca;Carlin, Silvia;Vrhovsek, Urska;Mattivi, Fulvio
2015-01-01

Abstract

Every grape cultivar has its own unique genetic characteristics, leading to the production of a different secondary metabolite profile. Aroma is one of the most important aspects in terms of the quality of grapes and previous studies have assigned specific aromas to particular grape cultivars. In this study we present the molecular profiling of volatile aroma metabolites and their precursors in ten selected genotypes, including six Vitis vinifera cultivars, two American species (Arizonica Texas, Vitis cinerea) and two interspecific crosses. Chemical profiling was achieved through combined use of two orthogonal techniques, GC–MS and LC–HRMS, before and after enzymatic hydrolysis. The results show that both free and glycosidically bound aroma precursors behave differently in each different grape cultivar and species. As many as 66 free aroma volatile molecules (originally existing and released after hydrolysis) were profiled through GC–MS analysis, while 15 glycosylated precursors of volatiles were identified through LC–HRMS and correlation with GC–MS data
Aroma
Grape
Glycosides
GC–MS
LC–HRMS
Settore CHIM/10 - CHIMICA DEGLI ALIMENTI
2015
Ghaste, M.S.; Narduzzi, L.; Carlin, S.; Vrhovsek, U.; Shulaev, V.; Mattivi, F. (2015). Chemical composition of volatile aroma metabolites and their glycosylated precursors that can uniquely differentiate individual grape cultivars. FOOD CHEMISTRY, 188 (1): 309-319. doi: 10.1016/j.foodchem.2015.04.056 handle: http://hdl.handle.net/10449/25191
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