The color of mung bean soup varies with water quality, kitchen utensils and heating time. The water quality in the north is alkaline and the water quality in the south is acidic, so generally the mung bean soup in the north is red and the mung bean soup in the south is green. In addition, the heating time will also lead to differences, the shorter the time, the greener the bean soup, and the longer the bean soup.
The reason why mung bean soup turns red is that mung bean skin is rich in polyphenols, mainly flavonoids. After boiling mung beans, polyphenols in the skin will dissolve in mung bean soup. When mung bean soup is exposed to the air, it will undergo an oxidation reaction with oxygen in the air, which will lead to color changes.
Precautions for drinking mung bean soup?
1, don't use iron pot to cook mung bean soup?
When cooking mung bean soup, it is most inappropriate to use an iron pot. Most of the active ingredients of mung bean are in the skin of mung bean. After the flavonoids and metal ions in the skin of mung bean act, it may form a dark complex, which will make the color of mung bean soup black, which will cause gastrointestinal discomfort and indigestion after eating. Therefore, casserole is the most ideal for cooking mung bean soup. ?
2. Don't add alkali when cooking mung bean soup?
Mung beans are rich in vitamin B, which is an important part of the summer-heat relieving characteristics of mung beans and can make up for the nutritional loss when sweating. And alkali can seriously destroy vitamin B. At the same time, the flavonoid antioxidant components in mung beans will also be lost due to the addition of alkali, resulting in structural changes and yellow color. Therefore, do not add alkali to the mung bean soup. If you want to make the soup sticky, consider adding a small amount of oatmeal or glutinous rice to "thicken".
Reference to the above content? Straits Network-Why are there red and green mung bean soups cooked? Ant Manor 5. 10 Today's answer
Reference to the above content? People's Daily Online-Chinese Medicine Caution: Don't drink mung bean soup indiscriminately.