Certain biochemical questions connected with apple storage
1991
El Abbasi, O. | Meresz, P. | Lasztity, R. | Sass, P. (Budapesti Muszaki Egyetem (Hungary). Biokemiai es Elelmiszertechn. Tansz.)
When 2 apple varieties cultivated in Hungary (Idared and Redspur) were stored in 2 consecutive years (1988 and 1989) for 7 months in a normal atmosphere at a temperature of 2.5 C degrees, there was a most characteristic rise in the water-soluble pectin fraction (from an average 3.51 mg/g fresh weight to 4.89 mg/g by the 7th month in 1988 and from 2.53 mg/g to 4.45 mg/g by the 6th month in 1989) with a simultaneous reduction in the quantity of the alkali-soluble fraction (from 2.87 mg/g to 2.24 mg/g by the 7th month in 1988 and from 4.39 mg/g to 2.99 mg/g by the 6th month in 1989) with a simultaneous reduction in the quantity of the alkali-soluble fraction (from 2.87 mg/g to 2.24 mg/g by the 7th month in 1988 and from 4.39 mg/g to 2.99 mg/g by the 6th month in 1989). Changes in the polyphenoloxidase activity depend more on the year than on the variety, a clear reduction was observed during storage for both varieties, from an average value of 0.27 U/g protein to 0.10 U/g by the 7th month in 1988 and from 0.50 U/g to 0.28 U/g by the 7th month in 1989. A significant drop in polyphenol compounds can be observed during storage, chiefly due to the bound polyphenol content.
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