Nutritional end Microbiological A5pects ot BlanchingThere is appreciable loss of ascorbic acid, B-complex vitamins, and folate during blanching and subsequent cooling, particularly when these are carried out in water. Peas blanched for 3 min lose 339a of their initial ascorbic acid content, 209c of their riboflavin, 10'fr of their niacin, and 59r of their thiamine, even though these vitamins are stable during storage at —18°C C or lower. Similarly, losses of total sugars and soluble proteins can also be significant; depending upon the blanching method (hot water, steam, or microwave), duration and temperature; conventionally blanched peas also lose 409a of their minerals, 30'7c ot their sugars, and 209c of their proteins [64]. Vegetables such as peas, sliced beans, and diced carrots can lose half their total vitamin C due to their large surface—to—volume ratio; losses are smaller (about one—third of vitamin C) in whole beans, potatoes, and sprouts, where the surface—to—volume ratio is smaller and time appears to be of less importance than the surface area. Reported losses are about the same as when the food is cooked directly from the raw state [105].
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