Onion green can eat
Onion scrambled eggs overnight green can eat, onion cells contain more sulfur-containing biologically active substances, these sulfide-containing enzyme in the onion contained in alliinase under the action of the onion can be generated thiosulfinic acid lipids, aryl thiosulfinic acid lipids, allyl thiosulfinic acid lipids, such as onion pigment material predecessor. These substances undergo a series of reactions to produce pigments. Usually, the initial formation of blue pigment, blue pigment is not stable and gradually transformed into yellow pigment, both **** survival change presents green.
Why onions become green
Onions contain a lot of flavonoids, flavonoids encounter iron, aluminum, lead and other metals, resulting in blue, blue-black, brown and other different colors of the complex. Therefore, with an iron knife to cut vegetables, or iron or aluminum pan frying onions, the color of the finished dish is dark, not bright. Dipped in some dry flour and then fried, can prevent flavonoids directly with iron, aluminum and other metal contact and discoloration.
Eating value of onion
Onion is a very common cheap home cooking. Its flesh is tender, juicy and spicy with a mild flavor, good quality and suitable for raw food. Native to western Asia, cultivated throughout China, available in all seasons. Onions for food for the underground parts of the fat bulb (i.e., onion head). In foreign countries, it is known as the "Queen of Vegetables", with high nutritional value.
Contraindications
1, patients with skin diseases should not eat onions.
2, people with eye diseases can not eat onions, the condition will be aggravated.
3, patients with gastrointestinal diseases can not eat onions, which can easily lead to aggravation.