Because the mung bean sprouts cannot be exposed to sunlight during the sprouting process. When exposed to sunlight, the bean sprouts will turn pink. The reason why the mung bean sprouts turn red is very simple. The mung bean soup dissolves from the mung bean epidermis. The result of oxidative polymerization of phenolic substances under the action of oxygen in the air.

To prevent mung bean sprouts from turning pink, you need to take the following precautions:

1. The container used to grow mung bean sprouts must be completely protected from light. It is better to move the container to a dark place for germination.

2. For a bean sprout machine specially used to sprout bean sprouts, try to buy a completely black one. In addition, no matter what color the bean sprout machine is, it is impossible to completely avoid light even if it is covered with a light shield. Moving it to a dark place for germination is the safest measure.

3. During the germination process of mung beans, do not always open the lid to check the progress, because every time you open the lid, the mung bean sprouts will be exposed to light. Especially when placing the germination container in a place with strong light, do not open the lid easily to check.

In short, as long as you can ensure that the mung beans are not exposed to light during the germination process, the mung bean sprouts will never turn pink.

Extended information

Technical points

1. Remove bad beans during cleaning.

2. The container should have good drainage. Never let the beans soak in water, but maintain sufficient humidity.

3. Don’t let the beans see the sun, otherwise they will turn green immediately. Covering it with sand will protect it from sunlight, or if you are concerned, cover the container with a lid.

4. Beans grow very quickly after they sprout, so they must be harvested in time.

Notes

1. Bean selection: Choose high-quality bean seeds that are plump and without trauma. Generally, the beans available on the market are leftover from selected seeds, so they will produce The bean sprouts grow roots very quickly! So you have to choose carefully. Generally, you can pick out about half a kilo of good beans from one kilo of beans! To save trouble, buy beans directly from a seed store.

2. Do not let the bean sprouts come into contact with sunlight, which will cause them to sprout roots and turn into powder in advance.

3. Water frequently every day! Water every 2 hours or so, watering at night, and the interval should not exceed 8 hours.

4. Try not to use cold water, but use room temperature water.

Baidu Encyclopedia-Bean Sprouts