Why does black corn fade when cooked?

Why does black corn fade when cooked? Black corn is a variety of corn with high influence value and good taste. So how to cook black corn is delicious? Why does black corn fade when cooked? The following are the problems and solutions about the fading of black corn.

Why does black corn fade when cooked? 1 1. Is it normal for black corn to fade after cooking?

Everything is normal because of proanthocyanidins in black corn.

Procyanidins, also known as anthocyanins, are a kind of water-soluble natural pigments commonly found in natural green plants. They are the post-elements of anthocyanin hydrolysis to obtain color, and most of the key coloring substances in fresh fruits, vegetables and potted flowers are related to them.

Not only can be taken, but also has the effects of high nutrition, antioxidation, cardiovascular and cerebrovascular diseases, eye protection and the like.

Authoritative experts suggest that in order to avoid the outflow of proanthocyanidins, it is recommended to choose steamed corn as much as possible when taking it.

Second, is black corn a genetically modified food?

This is not genetically modified food.

Authoritative experts at all levels have repeatedly confirmed that you can safely take it, and its nutritional value is 2-8 times higher than that of ordinary corn.

In the Yuan Dynasty, purple glutinous rice was used as a tribute for the king to enjoy, and ordinary people could not eat it.

Black waxy corn is native to Xinzhou, Shanxi. Because of its unparalleled average temperature, sunshine and temperature difference between day and night, the black corn seeds grown and developed in this farmland are round, tender and delicious, and rich in nutrition. Black corn is rich in species diversity, with more than 100 varieties in the world.

Moreover, every 100g of black corn contains 1 and 6g of proanthocyanidins, which is the first of the real proanthocyanidins.

Thirdly, the nutritional elements of black corn were introduced in detail.

The content of nutrient elements is high. The daily intake of sodium should be 2 ~ 2,5%, while the daily intake of potassium should be 1, 9 ~ 5,6%. People generally lack potassium, especially women. The nutritional elements of black sweet corn are much higher than other cereal crops, especially the potassium content reaches 63 10 ~ 9050 mg/kg, which is 3 ~ 8 times that of other cereals. It can regulate blood balance, relieve fatigue, prevent and treat hypertension and cerebral thrombosis, maintain the heart, regulate mood, relieve stress mentality and stabilize mental state. Black sweet corn is a kind of alkaline coarse cereals, which has slimming effect.

Black sweet corn is high in copper, which is a food for nourishing blood and qi. Iron is one of the most important elements in the body, which is involved in the production of hemoglobin concentration, trypsin and some enzymes, and is also related to oxidative phosphorylation. Insufficient intake will cause confusion in the whole process of physiological function and metabolism, leading to iron deficiency anemia. In addition, the zinc content of rice is three times that of other grains, so it is a very good iron supplement food. Zinc participates in the production of nucleotides and protein and the metabolism of carbohydrates and vitamin A in human body, and can maintain all normal physiological functions of pancreas, sex hormones, hypothalamus and pituitary, digestive tract and skin. In particular, zinc deficiency in children affects the growth and development in spring and a series of changes such as anemia, diarrhea and low immune function.

Why does black corn fade when cooked? Most of the corn we usually eat is yellow, and black corn is a new variety that has only appeared in recent years. It is black because it contains melanin, just like black rice, black sesame seeds and black beans.

But it is different from other black grains: foods like black rice and black beans are all black in the skin and white in the inside, while black corn is a whole grain precipitated by melanin, with bright skin and black in the inside.

In fact, food discoloration is a normal phenomenon, because the pigment contained in food dissolves, resulting in a similar discoloration phenomenon. Like black rice, black beans, black wolfberry, black sesame, red beans and peanuts, they will fade after soaking in water.

Black corn is no exception, and the pigment it contains is also water-soluble pigment. After soaking or boiling in water, the pigment dissolves in water and changes color, which is not caused by dyeing. This pigment will not cause any harm to the human body, so don't worry at all.

This melanin in black corn is also specially extracted and used for coloring food and beverage. After a series of special processes, the melanin extract is purple-black, and after being dissolved in water, it is bright purple-red, with very good gloss and a little sour.

Moreover, it is precisely because of this melanin that black corn not only contains many kinds of vitamins, amino acids, plant proteins and other nutrients contained in ordinary corn, but also can stimulate human cell activity, tonify kidney and nourish skin, which is also good for cardiovascular diseases.

However, because the pigment contained in black corn is not wrapped on the surface of the grain, such as black rice and black beans, but inside the grain, the fading will not be obvious only after a short period of washing or soaking.

If you put it in a jar and add water, the water will start to change color in about five minutes. The longer you cook, the darker the water will be until it turns black. If you want black corn to fade less, you can use steaming, and the fading will be significantly less than cooking.

Why does black corn fade when cooked? How to cook black corn delicious?

step

1, fresh corn peeled off the outer thick skin.

2. Leave two layers of thin skin on the inner layer, remove the corn stigma and wash it with clear water.

3. Add the right amount of water to the pot.

4. Add the washed corn, and the water should not cross the surface of the corn.

5. Add 1 tablespoon salt after the fire is boiled.

6. Cover and cook 15 minutes.

7. Take out the corn and drain it immediately after it is cooked.

8. Cut and eat.

skill

When cooking corn, leave the innermost two thin skins, add some salt to the water, and the cooked corn will taste better.

Cooked corn should be immediately fished out and drained, and it should not be soaked in boiled corn water for a long time, otherwise the taste of corn will not be rich.

Introduction of nutritional elements in black corn

The content of trace elements is high. The daily intake of sodium should be 2 ~ 2,5%, while the intake of potassium should be 1, 9 ~ 5,6%. People generally lack potassium, especially women. The contents of various trace elements in black sweet corn are much higher than other cereal crops, especially the potassium content is as high as 63 10 ~ 9050 mg/kg, which is 3 ~ 8 times that of other cereals. It can regulate body fluid balance, resist fatigue, prevent and treat hypertension and cerebral thrombosis, maintain heart function, and help to regulate mood, relax mood and stabilize psychology. Black sweet corn is a rare alkaline grain, which has the function of losing weight.

Black sweet corn has high iron content and is a blood-enriching food. Iron is one of the most important elements in human body, which is involved in the synthesis of hemoglobin, cytochrome and some enzymes, and is also related to energy metabolism. Insufficient intake will cause disorder of physiological function and metabolic process, resulting in iron deficiency anemia. In addition, the zinc content of rice is three times that of other grains, so it is a good zinc supplement food. Zinc participates in the synthesis of nucleic acid and protein and the metabolism of carbohydrate and vitamin A in human body, and can maintain the normal physiological functions of pancreas, gonad, pituitary gland, digestive system and skin. In particular, zinc deficiency in children affects spring development and a series of changes such as anemia, diarrhea and low immune function.

Black sweet corn is rich in calcium and phosphorus, which is 8- 10 times that of other cereals. The main physiological functions of calcium and phosphorus constitute human bones and teeth. Calcium can maintain the normal excitability of nerve and muscle, which is the basis of promoting blood coagulation, muscle contraction and relaxation and normal nerve conduction. If the human body is lacking, it will lead to rickets, rickets and osteoporosis. Black sweet corn has high melanin content. Other black crops are mostly black and white inside, while black sweet corn is transparent with black inside and bright outside. Melanin can stimulate the activity of human cells, reduce serum cholesterol, play a positive role in the prevention and treatment of cardiovascular diseases such as arteriosclerosis and hypertension, improve human immunity, tonify the kidney and beautify the face, and have a good health care function.

Black sweet corn has high Vc content. Most cereal crops do not contain Vc, while black sweet corn contains Vc 483 1mg per 100 grams, which plays an important role in the metabolism of sugar and protein. It can promote the formation of interstitial cells and collagen fibers. If Vc intake is insufficient, many tissues will shrink, and in severe cases, they will suffer from scurvy. In addition, Vc helps to absorb iron, improve the function of hematopoietic system and treat iron deficiency anemia.

What should I do if the color of black corn fades after cooking?

Yan Jianbing, a corn expert in China and a professor at Huazhong Agricultural University, explained that this is a kind of black corn with high nutritional value. "Ink" is produced because corn contains water-soluble melanin, commonly known as "anthocyanin", which is non-toxic and harmless and can be safely eaten.

Analysis on the Skills of Cooking Corn

There are at least two tricks:

The first point is very important.

Just be sure to bring the sapphire rice skin inside and cook it together.

Effect of corn husk on corn

Is the relationship between fish and shark's fin.

It's a loan.

Be sure to keep it.

But it must be removed.

And the cleaner the better.

The peeled corn turned into chicken ribs.

The second is cooking in a pressure cooker.