Why do beans turn black, why do black beans fade Reasons why black beans fade

It is not recommended to eat the black skin of soybeans, generally such soybeans are spoiled, and eating them will be bad for the body, so it is recommended not to eat.

First of all, we must know that the bad food has bred a large number of harmful bacteria and microorganisms, and it is easy to increase the burden of the human gastrointestinal tract after eating, which has a certain impact on the human stomach and intestines.

If soybeans have passed the expiration date, a small amount of intake will not have much impact on the body, however, after the expiration date of soybeans will deteriorate, may also lead to the increase of bacteria, viruses or some harmful substances, and may also become moldy, if too much intake of expired soybeans, may cause patients to have some gastrointestinal symptoms, common nausea, vomiting, abdominal pain, diarrhea and other manifestations.

It is important to know that the nitrite in expired soybeans may exceed the standard, and patients who consume too much may also be prone to acute nitrite poisoning.

How to preserve soybeans:

First we prepare a few plastic bottles, and then put a few peppercorns in our plastic bottles, because it has a nice insect repellent effect.

Then cut the part of the bottle mouth from another plastic bottle, then put it on the plastic bottle mouth, then pour our soybeans into our bottle, and then tighten the cap.

Then put it in the freezer compartment of our refrigerator so that our soybeans are moldy-free, because at low temperatures, soybeans are able to store for quite some time.

Soybeans with black dots indicate that they are moldy and spoiled and cannot be eaten. Soybeans will slowly oxidize and rot after they die.

Why do black beans fade.

Black bean skin contains natural pigments, and soaking it in water for a long time will fade, which is why black bean porridge is reddish-brown. If it contains artificially added pigments, the organic solvent will be able to roll the cloth "mercilessly" to extract it. But judging from the comparison results, there is no problem with the bean sample.

Relevant experts provided the public with three ways to identify the quality of black beans: high-quality black beans are full; The green inside of the bean indicates that it is not fully ripe; If you dye it artificially and peel off the bean skin, there will be traces of impregnation inside.

Are dyed black beans harmful to the body.

Of course, dyed black beans are dyed with industrial pigments, edible artificial pigments, and natural pigments, which are harmful to the human body.

Identification method: according to the chemical characteristics to distinguish, take a little pigment solution, and then add soda, add vinegar, take a look, see if the color changes, natural anthocyanin color will be reddish under acidic conditions, and the color will fade under alkaline conditions, and the dye has no such chemical change.

Black beans should be eaten with something.

Black beans + brown sugar: Eating black beans and brown sugar together can nourish the liver and kidneys, invigorate blood and menstruation, and beautify black hair.

Black beans + grains: Eating black beans with grains can balance nutrition and increase nutritional value.

Black beans + cereals: Eating black beans and cereals together complements the amino acids contained in them, which will increase the nutritional value.

Black beans + black sesame seeds: Eating black beans and black sesame seeds together can play a role in nourishing the liver and kidneys.

How to eat black beans can make the hair black and shiny.

1) Stir-fry the black beans with the same black sesame seeds, and eat one-third of a small bowl every day.

2) Grind the fried black beans, black sesame seeds, peanuts and walnuts and brew a small cup with boiling water.

3) Beat the soaked black beans into soy milk and drink, or boil the black beans with water and eat.

Three tricks to distinguish real and fake black beans: one rub, two peels and three soaks.

1.When buying black beans, you can first pick up a few black beans and rub them in the palm of your hand a few times, if the palm is dyed with color, it means that the beans are dyed. If the black beans are real, after rubbing, the color will change from black to shiny.

2.You can also peel off the black beans and observe the color of the inner wall of the epidermis, the inner wall of the real black bean is white, and the inner wall of the dyed black bean is black.

3.If it is really difficult to identify, you can also soak the black beans in water for a few days to see if they germinate.

Some scholars introduced: It is normal for black beans to soak and fade, and nutrients will not be lost. But.

If the black beans fade after just washing them, or if the water is particularly dark and smells when soaked, then the black beans may be stained with chemical pigments.

After soaking the real black beans for 1 hour, the water turns reddish-brown.

Hello, the colored beans themselves are colored, there is a decomposition of the bean structure during the cooking process, and part of the pigment is released at the same time, different beans have different structures, so the amount of pigment he decomposes is different, just like red beans and white rice cook porridge together, the porridge will turn red, and the red beans are red, but not so dark, of course, this pigment is not harmful to the human body, so you can eat it with confidence.

Melanin is also a protein, and after boiling, the peptide chain of the protein is broken and falls off into water for reorganization.

Yes, dark foods will fade to some extent, and the same is true for black rice. If it's okay, you can eat it boldly.