Will Fan Zhihong lose its nutrition when washing vegetables?

Fan Zhihong, associate professor of the Department of Nutrition and Food Safety, College of Food Science, China Agricultural University, holds a doctorate in food science. Director of Nutrition Support Committee of China Food Science and Technology Association, food nutrition consultant of China Hotel Association, expert member of Food Nutrition Committee of China Cuisine Association, and expert consultant of China Nutrition and Dietary Promotion Project. The speaker of "Thousand Lights" of Jiangsu City Channel, and a roving expert of health education of the Ministry of Health.

Wash vegetables correctly to ensure that nutrients are not lost.

If you think washing vegetables is the least technical job in daily cooking, I can tell you responsibly: you are wrong! Although "washing, soaking, rinsing and wiping" can make vegetables and fruits clean to a great extent, can this ensure that their nutrition will not be lost? Washing vegetables is not a simple matter.

1. storage method: the experiment shows that the pesticide residue content on vegetables is reduced by 5% after being left at room temperature for about 24 hours. Therefore, the vegetables and fruits bought can be left for a period of time, so that the pesticides can be oxidized and degraded first, and the pesticide residues are reduced, and then they are ready to be cleaned.

2. Washing method: It is considered that the longer all kinds of fruits and vegetables are soaked in clear water, the easier it is to clean them, but the correct method should be to wash them with clear water after soaking. When washing, all kinds of stains will follow the water and bid farewell to vegetables and fruits. The soaking time should not exceed 15 minutes.

3, peeling method: cucumber, wax gourd and other vegetables have waxy surfaces, which are easy to absorb pesticides. My suggestion is: for these melons and fruits, such as cucumber, wax gourd, pumpkin, radish, etc., it is best to peel them first and then rinse them clean!

4. Cleaning method: For vegetables with smooth surfaces such as cantaloupe and loofah, the dirty things on the surface can be removed by directly cleaning with water. Vegetables with uneven surfaces, such as cucumbers and bitter melons, are not so easy to handle. However, as long as you choose a soft brush, you can clean it easily.

5, heating method: for cauliflower, broccoli and other vegetables whose surfaces are not easy to clean, as well as celery, beans, lettuce and other vegetables suitable for heating, you can wash them and blanch them with boiling water before cooking.

6. Sunbathing: Sunbathing vegetables and fruits can remove some pesticides. Using the multi-spectral effect of sunlight, some pesticides remaining in vegetables can be decomposed and destroyed. According to the measurement, the residues of organochlorine and organomercury pesticides decreased by more than 60% when fresh vegetables and fruits were irradiated in the sun for 5 minutes. (China Organic Agriculture Network)