| | Differentiating e jiao, deer antler gelatin (lu jiao jiao) and pigskin gelatin 阿膠﹐鹿角膠﹐豬皮膠的區別 按此看中文 translated by: Joe Hing Kwok Chu （in English and Chinese 中英文)
E jiao, also known as donkey skin glue. It is the gelatin of the hide of donkey of the equines. The gelatin extract of the hide is render to until it become a solid glue blocks when it is cold. The commercial glue block is rectangular or square in shape, dark brown, shiny, translucent and amber color. It is hard and brittle, with slightly sweet flavor. Take a little of this product add about 3 times of boiling water and stir for 10 to 60 minutes until dissolved. The solution is transparent like tea color, clear and not muddy. It is aqueous tan, turbid opaque, after cooling the surface shows some specks of fatty oil. It does not agglutinate when let sit for some time. It has slight fishy smell.
Pigskin gelatin, also known as the new gelatin. It is extract of pigskin. The commercial product are in square blocks, with surface brown, opaque to light perspective, the cross section is not smooth and bright. Add a little of this product and stir to dissolve in boiling water. It shows aqueous tan, turbid opaque and after cooling there is a layer of fatty oil on the surface with a strong skin broth flavor and slightly sweet taste. Its efficacy is like that of e jiao.
Deer antler gelatin (lu jiao jiao) is made by rendering the antlers with water into concentrated glue. The commercial product is in square shapes, yellow-brown or reddish brown, translucent, and some of the product show yellow-white foam on the upper layer. It is brittle, fragile, and the broker surface is bright. Take some of this product and add 3 times the amount of boiling water, dissolve 2 to 5 minutes, the solution was light red liquid, liquid with more droplets of oil. Deer antler gelatin is warm, sweet, salty.
UV spectroscopy may be used to identify e jiao, deer antler gelatin, pigskin gelatin :
Take small amount of samples. Weigh accurately and add 50% ethanol solution and filter. The sample preparation should contain 1mg per ml of the solution. Use UV spectrophotometer and scan measurement. E jiao will show 270 ~ 280 nm and has a maximum absorption peak at 290 nm deer antler gelatin (lu jiao jiao) will show maximum absorption peak, while no significant absorption peaks will show in pigskin gelatin.
The Chinese article is written by Shi Ya Fang, Traditional Chinese Medicine Medical Journal
阿膠﹐鹿角膠﹐豬皮膠的區別
阿膠又稱驢皮膠，為馬科動物驢的皮經煎熬濃縮而成的干燥膠塊。呈長方形或方形膠塊，黑褐色，有光澤，對光透視顯琥珀色半透明狀。質硬而脆，斷面光亮。氣微，味微甘。取本品少許加沸水約3倍攪拌10～60分鐘溶解，溶液呈透明的紅茶色，清而不濁，冷卻後，液面可見少數油滴，放置不凝集，微帶腥氣。
豬皮膠又稱新膠，系豬皮熬制而成，呈方塊狀，表面棕褐色，對光透視不透明，斷面不光亮。取本品少許加入沸水溶解，水溶液棕褐色，混濁不透明，冷卻後表面有一 層脂肪油，有強烈的肉皮湯味，味微甜，功效同阿膠。
鹿角膠為鹿角經水煎熬濃縮制成的固體膠，呈扁方塊，黃棕色或紅棕色，半透明，有的上部有黃白色泡沫層。質脆，易碎，斷面光亮。取本品少許加入3倍量沸水，2～5分 鐘可溶解，溶液呈淺紅色液體，液面有較多油滴。鹿角膠性溫，味甘 ﹐咸。
阿膠，鹿角膠，豬皮膠也可採用紫外光譜法鑒別，方法為：
分別取樣品少許，精密稱定，加50%的乙醇溶解過濾，配制成每毫升含樣品1mg的溶液，置紫外分光光度計掃描測定。阿膠270～280nm有最大吸收峰，鹿角膠290nm處有最大吸收峰，而豬皮膠則無明顯吸收峰。
史亞芳，中國中醫藥報
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