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High-quality Italian rice cultivars: Chemical indices of ageing and aroma quality

Author:
Griglione, Alessandra, Liberto, Erica, Cordero, Chiara, Bressanello, Davide, Cagliero, Cecilia, Rubiolo, Patrizia, Bicchi, Carlo, Sgorbini, Barbara
Source:
Food chemistry 2015 v.172 pp. 305-313
ISSN:
0308-8146
Subject:
chemical composition, cultivars, gas chromatography-mass spectrometry, headspace analysis, hexanols, odors, rice, solid phase microextraction
Abstract:
The volatile fractions of six Italian high-quality rice cultivars were investigated by HS-SPME–GC–MS to define fingerprinting and identify chemical markers and/or indices of ageing and aroma quality. In particular, four non-aromatic (Carnaroli, Carnise, Cerere and Antares) and two aromatic (Apollo and Venere) rices, harvested in 2010 and 2011, were monitored over 12months.Twenty-five aroma components were considered and, despite considerable inter-annual variability, some of them showed similar trends over time, including 2-(E)-octenal as a marker of ageing for all cultivars, and heptanal, octanal and 2-ethyl hexanol as cultivar-specific indicators. The area ratios 2-acetyl-1-pyrroline/1-octen-3-ol, for Venere, and 3-methyl-1-butanol/2-methyl-1-butanol, for Apollo, were also found to act as ageing indices.Additional information on release of key-aroma compounds was also obtained from quantitation and its dependence on grain shape and chemical composition. Heptanal/1-octen-3-ol and heptanal/octanal ratios were also defined as characterising the aroma quality indices of the six Italian rice cultivars investigated.
Agid:
5423290