The method of decocting is different. Ejiao itself pays attention to the process of making, which requires repeated boiling, concentration and paste collection, and becomes Ejiao. Pigskin can actually be boiled into glue.

In the past, all kinds of animal skins could be boiled into glue to take. For a long time, people found that the glue boiled from donkey skin had the best effect, so it was stipulated that only donkey skin glue was called Ejiao, and the glue boiled from other animal skins could only be called ordinary glue.

The earliest Ejiao was made of cowhide, but the ancient cows played a great role. It was forbidden to kill cows at will, so it was replaced by donkey skin. Now there is a saying that the boiled pigskin is called New Ejiao, and the research shows that it is similar to the donkey skin in a large part. Similar collagen can be obtained by treating cowhide, pigskin and sheepskin with boiled donkey skin.

Extended data

Pharmacological effects of Ejiao

1, influence on blood cells After a large number of blood draws caused hemorrhagic anemia in dogs, the red blood cells and hemoglobin increased faster than those in the control group by gavage with Ejiao solution (30g/day, *** 10 day).

2. Effect on calcium metabolism Ejiao can improve the calcium balance in animals. Ingesting the stomach with donkey-hide gelatin and adding calcium carbonate to food can increase calcium absorption and retention in the body, so that blood calcium is slightly increased; This calcium carrying effect may be related to glycine contained in Ejiao.

3, the role of prevention and treatment of progressive muscular dystrophy, feeding guinea pigs with special feed, so that all of them cause progressive muscular dystrophy, only 20% of them with Ejiao, most of them are sound and asymptomatic. After the disease has occurred, the use of Ejiao can also gradually alleviate the disease.

The author thinks that vitamin E can prevent and treat this disease, and the effective reason of Ejiao may be related to its ability to prevent the oxidative damage of vitamin E in feed. There is moderate amount of vitamin E in this special feed, but it also contains animal fat, which is easy to make vitamin E oxidation ineffective and cause this disease.

Baidu encyclopedia-Ejiao