Is it normal for purple potato soup to turn blue?

It is a normal phenomenon.

Purple sweet potato is a kind of food rich in anthocyanin, which is a water-soluble pigment. It will show different colors in different pH environments, red in acidic environments and blue-green in alkaline conditions. So it is normal for purple potato soup to turn blue.

2

Purple potato soup has turned blue. Can I drink it?

You can drink.

The water for cooking soup is usually tap water. The purified tap water is generally alkaline water. Purple sweet potatoes are boiled with alkali, and anthocyanins are naturally blue. Anthocyanin is a substance that can resist free radicals, help to resist aging, and is good for the body after drinking.

three

Why doesn't purple potato turn blue when cooked in soup?

Add some lemon juice or white vinegar.

Purple potato soup turns blue because the water used to cook the soup is alkaline water. At this time, adding some acidic liquid can change the color back. Lemon juice and white vinegar are common acidic liquids, which can be discolored by pouring some when cooking soup.

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What are the benefits of eating purple potato soup?

lose weight

Purple sweet potato is low in calories, fat and cholesterol, and can also help sugar to be converted into fat for storage in the body. So eating purple potato soup every day helps to lose weight.

Prevention and cure constipation

Purple sweet potato contains a lot of cellulose, which can help gastrointestinal peristalsis, clean the intestines and ensure smooth defecation. Therefore, drinking purple potato soup often can help expel toxins from the body and prevent other intestinal diseases.

Enhance immunity

Purple sweet potato contains a lot of mucin, which can help prevent the occurrence of collagen diseases, and the vitamins and minerals in purple sweet potato can regulate human function and improve human immunity. So drinking purple potato soup often is very good for your health.

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How to select high quality purple potato

1, the same size of purple potato should be weighed more, which means it will taste sweeter.

2, buy purple potatoes don't pick round, want long purple potatoes, the same pile of purple potatoes is mainly spindle-shaped, and the taste will be better.

3, the surface of a good purple potato looks smooth, so there should be no black spots on the epidermis, and it has a strange smell after being cooked with black spots; Rotten purple potatoes are poisonous. Don't pick them.