บทคัดย่องานวิจัย

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Effect of cold and freezing storage on pigments and compositional changes of two date varieties.

Rasmy, N. M.; Foda, Y. H.; Hassan, I. M.; Kamal, A. A.;

Annals of Agricultural Science (Cairo) Year: 1996 Issue: Special Issue Pages: 125-137 Ref: 19 ref.

1996

บทคัดย่อ

Effect of cold and freezing storage on pigments and compositional changes of two date varieties.

The effect of postharvest cooling (4 deg C) or freezing (-18 deg C) on the pigment changes in Egyptian date (Phoenix dactylifera) cultivars Samani and Zaghloul were investigated. The levels of carotenoids, chlorophylls a and b, anthocyanin and anthocyanidins of fresh dates of the 2 cultivars were measured during the late khalal stage. Pigment changes in the samples were then monitored for 4 weeks in the cooled dates and 6 months in the frozen dates. Fresh Zaghloul dates contained higher amounts of carotenoids, chlorophyll b, total chlorophyll, anthocyanin and anthocyanidin than fresh Samani dates, which had a higher amount of chlorophyll a. Pigment loss was greater in both cultivars during storage at 4 deg C for 4 weeks than during storage at -18 deg C for 6 months. Storage at 4 deg C for 4 weeks also caused a continuous increase in total acidity and noticeable losses in moisture content, total sugars, reducing sugars, and protein in both cultivars.