... standard on Chinese Pharmacopoeia)1,Appearance: White powder2,Water content (Karl Fischer) : ≤5%3,Acetate content (HPLC method): ≤5%4,Amino ... acid composition: ±10% theoretical value5,Purity (by two HPLC methods): ≥98.0%6,Single impurity (by two HPLC methods): ≤1 ... .0%7,Total impurity (by two HPLC methods): ≤2%8,Peptide content (Kjeldahl method): ≥85%9 ...