Black beans and black kidney beans are two different kinds of beans. The price of black kidney beans is usually lower than that of black beans, so some vendors will sell black kidney beans as black beans. The difference between black beans and black kidney beans is mainly reflected in the following aspects:
1, with different appearance.
Black beans are larger than black kidney beans, mostly round (some varieties are close to oval), while black kidney beans are slightly oblate.
The true black bean skin is black, but dull, and the umbilical cord is not obvious, while the black kidney bean skin is black and bright, and the umbilical cord has obvious leucorrhea.
2. Beans have different colors.
Black beans and black kidney beans have different colors, which is the most obvious difference between them. The kernel of black bean is yellow or green, while the kernel of black kidney bean is white with bluish black in the white.
3. The color of the soaked water is different.
Black beans are red after soaking in water, and the color will change with the change of PH value. Black kidney beans are purple-black after soaking in water, and the color loss is worse than that of black beans.
4. Different species and nutritional value
Black beans belong to soybeans, which, like soybeans, can germinate into sprouts, tonify the kidney and have high fat content. Black kidney bean belongs to adzuki bean, also known as starch bean, with high starch content, belonging to the same category as adzuki bean and mung bean.
Black kidney beans are more suitable for porridge, which has no medicinal value and can only be supplemented. Black beans can be made into bean sprouts, soybean milk or bean products, which are both medicinal and edible beans and can be used for diet therapy. For example, black beans must be used to make vinegar soaked black beans.
5. Different places of origin
Black beans are native beans in China; Black kidney bean originated from Mexico and Argentina in America, and was introduced and cultivated in China at the end of 16.
6. The taste is different
Black beans taste like soybeans and are hard; Stew for a long time before eating. Black adzuki bean is easy to stew, and it is very noodles and tastes good, suitable for the elderly and children.
Second, how to choose high-quality black beans
1. Pay attention to the appearance of black beans. There is a small white spot in the middle of real black beans. If it is dyed, the small white spots will change color.
2, peel off the bean skin, the bean skin of black beans is very thin, and the color of dyed black beans will penetrate the endothelium. After peeling off the black clothes, you can see that the inside of the black clothes will also change color. Peel the bean skin. If it is white, it is really black beans.
3, wipe the epidermis, real black beans rub hard on white paper, will not fade, and the color of dyed black beans will leave traces after rubbing. When you buy, you can rub the black beans in your hand to see if they fade.
4. soak in vinegar. Black beans contain anthocyanins. Once this anthocyanin meets white vinegar, it will undergo some chemical reactions and turn red. If the white vinegar turns red, it is a pure true black bean; if the vinegar does not change color, it is a fake black bean.
Third, how to preserve black beans
The storage method of black beans is simple. Just put it directly in a sealed jar and store it in a cool place. Don't let the sun shine directly. It should also be noted that because beans are prone to insects, it is best to eat black beans as soon as possible after buying them back. Or just to be on the safe side, you can also store black beans in the refrigerator, which will allow us to keep them for a long time, but it is best not to keep them for too long, otherwise the taste of black beans will be bad and it will have a great impact on us. We should eat black beans while they are hot, which is a healthy way to eat.