This product is a traditional product of factory, applied to the baterium culture medium for the manufacture of of antibiotics. It contains complete amino acids, having unique micororganism-cultivating function. Hence, it is applied to the manufacture of gentamicin, aureomycin, spiramycin etc. Physical property:White powder, or yellowish powder, freely soluble in water, easily absorbing moisture with high adhesive performance as a result. Chemical property:It consists of polypeptides,dipeptides or compound-amino-acid substances formed through the hydrolysis of collagenous protein with general characteristics of the protein. Physicochemical indices: 1. Color: White powder or yellowish powder 2. Nitrogen (Total)>14.5 % 3. Moisture Content=5% 4. Ash<5% 5. Phosphorus (Total) =0.2% 6. Chloride=5% 7. pH: 5-7