Ejiao is a regular rectangular block, usually about 8.5 cm long, 3.7 cm wide and 0.7 or 1.5 cm thick. The surface is brown-black or black, smooth and shiny. Slightly transparent to light. Hard, brittle, brittle, brown-black or black in cross section, smooth and shiny. The smell is weak and the taste is slightly sweet. It is best to be black, bright, transparent, odorless and not soft after summer.
According to the National Pharmacopoeia, Ejiao can only be boiled with donkey skin. Other animals' fur has different effects of cooking gelatin, among which cowhide is called yellow gelatin, and the effect is second, while donkey skin has the opposite effect of cooking gelatin. Once eaten by pregnant women, it is very likely to lead to miscarriage.
Extended data
Colla Corii Asini is mostly made of collagen and its partial hydrolysate, and its nitrogen content is 16.43 ~ 16.54%, which is basically protein. Hydrolysis produces a variety of amino acids, including lysine 10%, arginine 7%, histidine 2% and so on. Judging from the amino acids produced, Ejiao is similar to gelatin, but the former contains more lysine and cystine and lacks tryptophan. It contains 0.75 ~ 1.09% ash and 0.079 ~ 0. 1 18% calcium.
Ejiao, housewife's bleeding, abdominal collapse, overwork such as malaria, lumbago and abdominal pain, limp limbs, fetal discomfort and husband's little abdominal pain, fatigue and emaciation, deficiency of yin and qi, and foot soreness can't last long, all of which are caused by deficiency of essence and blood and deficiency of liver and kidney. Therefore, it is necessary to replenish liver blood.
Baidu encyclopedia-Ejiao