Depending on the temperature, the time cannot be specifically determined, so the criterion for maturity should be the change in color.
1, in general, four season beans cooked to dark green, color a little yellow, relatively safe to eat, can be safely eaten, at least cook for more than 10 minutes.
2, in order to prevent poisoning, it is best to soak the four season beans in boiling water or hot oil until they are brown and ripe, if you choose to cook by stir-frying, you should be careful to stir-fry the beans evenly, and cook them thoroughly after heating them, so that the beans will lose their original green pea flavor.
Harmful effects of immaturity:
Generally long beans, lentils, etc. do not contain toxins, and uncooked string beans will produce toxic substances - saponins and plant lectins. When this substance reaches the intestines, it will combine with certain specific substances in the intestines, thus affecting the absorption of certain nutrients and leading to allergies, vomiting and other symptoms.
Expanded:
There are 3 points to note when frying string beans, one is that the amount of each pot should not exceed half of the pot; the second is to stir-fry in oil and then add the right amount of water to the pot, cover the pot, and keep it at 100 ℃ simmer for more than 10 minutes. Third, you should use a spatula to turn, so that it is evenly heated.
The main reason why beans are most likely to cause poisoning is that they contain saponins, hemagglutinins and other natural toxins. Saponins exist in the pods, the human gastrointestinal mucosa has a strong stimulating effect, can cause gastrointestinal symptoms. Hemagglutinin is present in beans, with blood clotting effect.
The incubation period of eating raw string beans is a few minutes, usually no more than 5 hours. The main symptoms are gastrointestinal inflammation, such as nausea, vomiting, abdominal pain and diarrhea. Vomiting is less frequent, up to tens of times. In addition, dizziness, headache, chest tightness, cold sweat heartburn, heartburn sensation, the duration of the disease is usually a few hours or 1-2 days.
Baidu Encyclopedia - Four Season Beans
People's Daily Online - How to Prevent Four Season Bean Poisoning? Cook and simmer, don't buy the old ones