A significant proportion of antioxidants deteriorate during preliminary processing, preservation processes and lengthy storage. The use of inappropriate drying parameters, particularly temperature, can bring about the loss of nutritive constituents. Therefore, each kind of raw material requires specific conditions and their specification fundamentally influences the quality of the final product.
The drying of kale leaves brought about a decrease in the content of the constituents analyzed; the degree of loss depended to a significant extent on the drying method. Levels of total identified polyphenols, vitamin C and TEAC were all higher in freeze-dried leaves than in air-dried. In addition, better retention of antioxidants was observed in dried leaves stored at cold-store temperature.
Dried vegetables have a fairly long shelf-life, hence the advantage of blanching the raw material as a preliminary treatment. In spite of losses in antioxidant content caused by blanching at the preliminary stage of processing, drying blanched leaves resulted in lower antioxidant loss. Similarly, the loss of polyphenols and vitamin C and the decrease in TEAC occurring during storage was greater in non-blanched dried leaves than in blanched leaves.
A significant proportion of antioxidants deteriorate during preliminary processing, preservation processes and lengthy storage. The use of inappropriate drying parameters, particularly temperature, can bring about the loss of nutritive constituents. Therefore, each kind of raw material requires specific conditions and their specification fundamentally influences the quality of the final product.The drying of kale leaves brought about a decrease in the content of the constituents analyzed; the degree of loss depended to a significant extent on the drying method. Levels of total identified polyphenols, vitamin C and TEAC were all higher in freeze-dried leaves than in air-dried. In addition, better retention of antioxidants was observed in dried leaves stored at cold-store temperature.Dried vegetables have a fairly long shelf-life, hence the advantage of blanching the raw material as a preliminary treatment. In spite of losses in antioxidant content caused by blanching at the preliminary stage of processing, drying blanched leaves resulted in lower antioxidant loss. Similarly, the loss of polyphenols and vitamin C and the decrease in TEAC occurring during storage was greater in non-blanched dried leaves than in blanched leaves.
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