Effect of storage on quercetin content in frozen175 and dried shallot
2006
Horbowicz, Marcin
The studies on effects of freezing and drying on quercetin content in shallot, as well as storage time of obtained products, were carried out. Two landraces, marked PV-S and PV201, were taken for the studies. The process of drying was carried out using a semi-technological drier operated by forced airflow. Dried slices of shallot were stored in ambient temperature in closed glass containers, and quercetin was determined periodically. The process of drying and further 8 months of storage caused a small decrease (15 - 16%) of the quercetin level in shallot. During the process of freezing of sliced shallot and its subsequent storage over 8 months in temperature -21°C, the quercetin level declined slightly, too, although the decline was higher than in case of drying and storage of dried shallot.
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