Relationships of antioxidants in apple peel to changes in alpha -farnesene and conjugated trienes during storage, and to superficial scald development after storage.
Barden, C. L.; Bramlage, W. J.;
Postharvest Biology and Technology Year: 1994 Vol: 4 Issue: 1-2 Pages: 23-33 Ref: 20 ref.
1994
บทคัดย่อ
ABSTRACT :
Three experiments were conducted: (1) Cortland and Delicious apples were harvested at 4 weekly intervals, (2) Cortland apples were induced to ripen prematurely with ethephon sprays, and (3) Cortland apples were enclosed in brown bags for 6 weeks before harvest. At harvest and after intervals of storage at 0 deg C, concentrations of alpha -farnesene and conjugated trienes, estimates of total lipid-soluble and total water-soluble antioxidant activity, and concentrations of alpha -tocopherol, carotenes, ascorbic acid, glutathione, anthocyanins and flavonols in fruit peel were measured. The objective was to determine if differences in antioxidants at harvest persisted through storage, and if changes in antioxidants corresponded to accumulations of conjugated trienes and development of scald. Treatments resulted in significant differences in antioxidant and pigment concentrations at harvest. Water-soluble antioxidants and anthocyanins declined during storage, but lipid-soluble antioxidants generally
increased. In general, antioxidant concentrations at harvest were inversely related to maximum conjugated triene concentrations at the end of storage, and to scald development. However, no individual antioxidant was associated consistently with conjugated triene accumulation or scald development, and as conjugated triene concentrations increased, total lipid-soluble antioxidant activity also increased. Water-soluble antioxidants generally decreased during storage. Possible relationships between antioxidants and scald development are discussed.