Purple potato steamed bread turns green because purple potato is rich in anthocyanin, which is a water-soluble natural pigment with the characteristics of "acid turns red and alkali turns blue". When making steamed bread, purple potato is added with alkali, which will turn green when it is thick.
Anthocyanin is an unstable water-soluble pigment, which changes color due to pH and turns red when it meets acidity. It will turn green when it meets strong alkalinity and blue when it meets weak alkalinity; Neutrality will remain the original purple. If you feel uncomfortable looking at the color, you can add some citric acid or acidic substances, which will turn purple.
Extended data
Efficacy and function of purple sweet potato;
1. Purple sweet potato is rich in selenium and iron, which is an essential element for anti-fatigue, anti-aging and blood-enriching. In particular, selenium is known as the "king of cancer", so purple potato has anti-cancer effect and function. ?
2. Purple sweet potato is rich in cellulose, which has the efficacy and function of promoting gastrointestinal peristalsis, keeping defecation unobstructed, improving digestive tract environment and preventing gastrointestinal diseases. ?
Third, purple potato has the effect and function of slimming, which is a good choice for female friends to lose weight and eat purple potato. Eating purple potato will not only make you fat, but also help you lose weight, keep fit, prevent sub-health, relieve constipation and detoxify. ?
4. Purple sweet potato has the function of enhancing immunity. Purple sweet potato contains a lot of mucin, which can prevent the atrophy of liver and kidney connective tissue and improve immunity. Moreover, the minerals contained in purple potato play a very important role in maintaining and regulating human functions. Calcium and magnesium can also prevent osteoporosis. ?
People's Network-Do experiments to refute rumors: purple potato discoloration is normal. Watermelons rot when injected.
People's Network-Why is the soup cooked by purple potato green?
People's Network-What are the benefits of eating purple potatoes? Efficacy and function of purple sweet potato