不同来源阿胶表观特性差异研究

Fourteen kinds of Asini Corii Collas (ACC; donkey glue) on the market in comparison with authentic ACC were evaluated for proximate composition, rheological property, color and insolubility to establish an intuitive and effective evaluation method. The result showed that moisture content (10.24%-12.80%) and total nitrogen content (13.00%-16.69%) of all the samples meet the standard of ChP. Products from 3 of the brands had less total nitrogen content (≤14.17%) while those from the other 2 brands had higher total nitrogen content (≥16.12%). The authentic ACC had non-Newtonian index closer to 1 (≥0.92), lower viscosity (≤9.39 mPaos) and better solubility (rate of insoluble is only 2.94%) with light yellow color. The samples No.1 and No.4 had a similar apparent properties with authentic ACC while the others had a great difference from authentic ACC. Among them, the samples of No.2, No5 and No.10 showed lower non-Newtonian index and higher viscosity (≥17.71 mPaos) and the color of the powder and solution showed dark red. The samples of No2, No.3 and No.5 had bad solubility especially the sample of 2-b which showed large viscosity (322.51mPaos) and appeared jelly when being dissolved. The monosaccharide composition demonstrated that the glucose content of 2-b was three times as much as DEEJ-a and there was no fructose in 2-b sample. Therefore thickener was likely to be added in it. The powder and solution of samples No.7 and No.8 had a lighter color than authentic ACC. Consumers could identify the high quality ACC according to the apparent properties such as viscosity, solubility and color.?