Rice (Oryza sativa L.) is a seasonal product harvested over a limited period of a few weeks, while its use is distributed more or less all over the year. Therefore it is important to monitor changes occurring during storage and that may affect the quality of the final product. The present study investigates the effects of storage on the volatile fraction of six Italian high quality rice cultivars, analysed using a fully automated Head Space Solid Phase Micro Extraction (HS-SPME) system coupled with Gas Chromatography???Mass Spectrometry (GC???MS). Samples of two years harvest were monitored up to 18 months of storage, to identify reliable chemical markers and/or indices correlated to ageing. Changes of twenty five compounds of the volatile fraction of the six variety investigated (Antares, Carnaroli, Carnise, Cerere,Apollo, Venere) were examined and, despite the high inter-annual variability, some analytes had the same trend over time; among them: 2-(E)-octenal can be considered a realible marker of ageing for the investigated cultivars, while heptanal, octanal and 2-ethyl-1-hexanol showed to be more variety-specific indicators. Chemical indices of ageing not affected by inter-annual fluctuations, were also defined. 2-Acetyl-1-pyrroline/1-octen-3-ol for Venere and 3-methyl-1-butanol/2-methyl-1-butanol area ratios for Apollo were found to be a reliable chemical indicator of storage
Effect of Storage Time on the Aroma of Italian High Quality Oryza sativa L. Cultivars: Chemical Indices of Ageing
LIBERTO, Erica;GRIGLIONE, Alessandra;CORDERO, Chiara Emilia Irma;BRESSANELLO, DAVIDE;BICCHI, Carlo
2014-01-01
Abstract
Rice (Oryza sativa L.) is a seasonal product harvested over a limited period of a few weeks, while its use is distributed more or less all over the year. Therefore it is important to monitor changes occurring during storage and that may affect the quality of the final product. The present study investigates the effects of storage on the volatile fraction of six Italian high quality rice cultivars, analysed using a fully automated Head Space Solid Phase Micro Extraction (HS-SPME) system coupled with Gas Chromatography???Mass Spectrometry (GC???MS). Samples of two years harvest were monitored up to 18 months of storage, to identify reliable chemical markers and/or indices correlated to ageing. Changes of twenty five compounds of the volatile fraction of the six variety investigated (Antares, Carnaroli, Carnise, Cerere,Apollo, Venere) were examined and, despite the high inter-annual variability, some analytes had the same trend over time; among them: 2-(E)-octenal can be considered a realible marker of ageing for the investigated cultivars, while heptanal, octanal and 2-ethyl-1-hexanol showed to be more variety-specific indicators. Chemical indices of ageing not affected by inter-annual fluctuations, were also defined. 2-Acetyl-1-pyrroline/1-octen-3-ol for Venere and 3-methyl-1-butanol/2-methyl-1-butanol area ratios for Apollo were found to be a reliable chemical indicator of storage
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