The hot dishes haven't completely cooled down. Covering with plastic wrap can not only protect vitamin C in vegetables, but also increase the loss of vitamin C. It should be stored in the refrigerator after the dishes are cooled.

Secondly, dishes should be preserved with plastic wrap during storage, which can protect vitamin C. According to experts' determination, if they are stored for 6 hours and covered with plastic wrap, the preserved vitamin C is equivalent to eating an extra pear. In addition, the protective effect of different vegetables covered with plastic wrap on vitamin C varies from dish to dish. Taking100g of vegetables as an example, the pickled leeks covered with plastic wrap have more1.33mg of vitamin C and more1.92mg of lettuce leaves than those covered with plastic wrap. However, after 24 hours of storage with plastic wrap, vitamin C of concanavalis decreased by 65438±0.5mg, radish decreased by 3.4 mg, and cucumber decreased most obviously.