Corn turns black after cooking
Corn turns black after cooking. Corn is a very common cereal grain nowadays. Corn can be eaten in the morning and evening. Some people find that corn turns black after cooking. What's going on? Let me take a look at the relevant information about corn turning black after being cooked. Let's take a look. Corn turns black after cooking 1
After corn is stored in the refrigerator for a long time, it will turn black when cooked.
If yellow corn changes color after being cooked, it is due to deterioration. Do not eat it after it changes color. However, it is normal for flowered corn to change color after being cooked. Flower corn contains a substance called "anthocyanin". Anthocyanin is a kind of melanin and is easily soluble in water. This pigment is edible, non-toxic, harmless to the human body, and can be eaten with confidence. In addition, in terms of its nutritional value, it has anti-cancer and immune-enhancing effects, and its selenium content is several times that of ordinary yellow corn, which has certain therapeutic effects.
Different colors of corn have different nutritional values. Yellow corn is rich in lutein and carotene, which has a certain protective effect on vision. White corn starch content is high, so diabetics are advised to eat less.
Extended information
People who should not eat more corn:
1. People who are deficient in calcium, iron and other elements
Because whole grains contain phytic acid and dietary fiber, they will combine to form precipitation, hindering the body's absorption of minerals.
2. People suffering from digestive system diseases
If you suffer from liver cirrhosis, esophageal varices or gastric ulcer, eating a large amount of whole grains can easily cause venous rupture and bleeding and ulcer bleeding.
3. People with low immunity
If the long-term daily intake of fiber exceeds 50 grams, the person's protein supplementation will be blocked, fat utilization will be reduced, resulting in bone, heart and Damage to the functions of organs such as , blood and other organs, reducing the body’s immunity.
4. People with heavy physical activity
Coarse grains have low nutritional value and low energy supply, which is insufficient nutrition for people engaged in heavy physical labor.
5. Adolescents during the growth and development period
Due to the special needs for nutrients and energy for growth and development as well as the physiological requirements for hormone levels, whole grains not only hinder the absorption of cholesterol and its conversion into hormones, but also hinder the absorption of cholesterol and its conversion into hormones. Impedes the absorption and utilization of nutrients.
6. The elderly and children
Because the digestive function of the elderly is reduced and the digestive function of children is not yet perfect, digesting a large amount of dietary fiber is a great burden on the gastrointestinal tract. Moreover, the absorption and utilization rate of nutrients is relatively low, which is not conducive to the growth and development of children. The corn turned black after being cooked 2
The soup turned black after the corn was cooked
On August 19, Ms. Liao, who lives in Hukou County, went to the market to buy vegetables and make soup as usual. , add the fresh pork ribs bought and the corn brought from the countryside earlier to start making soup. After cooking all morning, when serving soup at lunch, Ms. Liao found that the soup in the pot had turned black, including the ribs. What she didn't expect was that the "culprit" turned out to be corn.
A reporter from Xunyang Evening News saw from the picture provided by Ms. Liao that it was supposed to be a pot of clear soup, but it turned black, and most of the corn kernels also turned black, which looked unappetizing. Ms. Liao introduced that the corn was brought from the countryside some time ago and kept in the refrigerator. She took it out to make soup that day. Before making soup, the color of the corn was still normal yellow. Unexpectedly, it turned black after cooking. This was also the first time she encountered it. "Maybe the corn went bad after being left in the refrigerator for a long time." Faced with this pot of soup, Ms. Liao felt that it would be too wasteful not to drink it. However, her family was worried that it was poisonous, so she finally threw away the soup at their insistence.
Corn turns black after being stored in the refrigerator for a long time
Regarding the issue of the soup turning black after the corn is cooked, a reporter from Xunyang Evening News asked food expert Mr. Huang. Mr. Huang told the Xunyang Evening News reporter that Ms. Liao’s corn became moldy due to being stored in the refrigerator for too long, so it turned black when making soup.
Mr. Huang introduced that at present, there are three types of corn commonly seen in vegetable markets: yellow corn, which is tender and goose yellow; waxy corn, which is white and flawless; and there is also a kind of flowered corn, with white grains mixed with grains of the same color as red beans. Strong and honest.
"If yellow corn changes color after being cooked, do not eat it. However, it is normal for flowered corn to change color after being cooked." Mr. Huang said that flowered corn contains "anthocyanin", which is a water-soluble melanin, and this " "Anthocyanins" are non-toxic and harmless and can be eaten with confidence. And in terms of its nutritional value, it has anti-cancer and immune-enhancing effects. The selenium content is several times higher than that of ordinary corn, and it has certain therapeutic effects.
"Different colors of corn have different nutritional values. Yellow corn is rich in lutein and carotene, which has a certain protective effect on vision. White corn has a high starch content, so diabetic patients are advised to eat less." < /p>
Vegetables and fruits should not be stored in the refrigerator for more than three days
Mr. Huang reminded the general public not to think that putting food in the refrigerator means entering the safe. In fact, Yes, food also has a shelf life in the refrigerator. Mr. Huang said that the refrigerator only suppresses the growth rate of bacteria by creating a lower temperature, but it is difficult to kill bacteria. Bacteria can also reproduce and grow in refrigerators. The most common pathogenic bacteria is Listeria monocytogenes, which is often called refrigerator disease. If infected food in the refrigerator is not heated thoroughly, people who eat it will develop symptoms such as vomiting, hemorrhagic rashes, and purulent conjunctivitis.
So, how long is the safety period of food in the refrigerator? Mr. Huang said that general green leafy vegetables, melons and fruits can be refrigerated for a short period of time. The storage time depends on the freshness, and it is best not to exceed 3 days. Quick-frozen foods, such as dumplings, steamed buns, glutinous rice balls, wontons, etc., have complex fillings that will gradually change in texture and easily lose flavor, so they should not be frozen for too long and are best eaten within one or two months.
The storage period of seafood such as fish, shrimp, turtle, and shellfish is shorter than that of livestock and poultry meat, and is best eaten within 3 months; the storage period of poultry meat such as chicken, duck, goose, and pigeon is shorter than that of livestock and poultry meat. Slightly shorter than red meat, usually 8 to 10 months; red meat such as pigs, cattle, and sheep can be stored for up to 10 to 12 months. Tropical and subtropical fruits such as bananas and mangoes have poor adaptability to low temperatures. If they are stored in the refrigerator, they will freeze and affect the taste. Corn turns black after cooking 3
Can corn be eaten if it turns black after cooking?
It depends on the situation:
1. Can it be eaten?
The black color of corn after cooking may be due to the variety of corn itself. For example, flower corn will contain purple or black corn kernels. These corn kernels will turn black after being cooked, but they cannot be eaten. Because this black color is the pigment of corn itself.
2. Inedible conditions
If the corn is rotten or other reasons for deterioration before cooking, it may turn black after cooking, and the corn at this time It can no longer be eaten, even if it is cooked.
How to judge whether corn is bad or not
1. Color
Generally, corn has white, yellow, or flower colors, etc. Good corn is bright and shiny in color, while bad corn may begin to appear dull or even moldy in color.
2. Corn kernels
Good corn kernels should be full and distinct, while bad corn kernels may appear mucus, rotten or shriveled. It is not recommended to buy and eat corn.
3. Taste
Fresh corn smells very rich in corn aroma, especially after it is cooked, the taste will be more obvious, while the bad corn smell will be lighter. Or not. If the damage is serious, there may be a pungent smell.
How to store cooked corn overnight
1. Refrigerated storage
After the corn is cooked, it can be stored in the freezer of the refrigerator. The low temperature of the refrigerator The environment can inhibit the growth and reproduction of microorganisms, and this can preserve corn for 2 to 3 days.
2. Frozen storage
The cooked corn can also be stored in the freezer, but the starch will harden after freezing, so it is best to reheat it before eating. It will be better.