项目                                  USP级
                                    （USP )
identity                              pass
specific rotation                    +107°- +121°  （10 %, H2O）
ph test                              3.5 to 5.5 (4% solution)
loss on drying                       ≥ 18.0%
residue on ignition                  ≥ 1.0%
limit of methanol                    ≥ 1.0%
gentamicin c1                        25% to 50%
gentamicin c1a                       10% to 35%
gentamicin c2a+c2                    25% to 55%
residual solvents                    meets the requirements
assay                                ≥ 590 ug/mg (dry basis)


potency: ≥590 μg Gentamicin per mg：

含量Assay (Gentamycin base):          ≥590 μg/mg  
比旋光度α20°C /D                     +107°- +121°  （10 %, H2O）
pH (4 %; H2O)                         3.5 - 5.5  
水分Water                             ≤15 % (K.F.)
硫酸根Sulfate:                        32 - 35 %  

庆大霉素靠结合到30S核糖体亚单位上引起密码读错，阻断肽酰-tRNA（peptidyl-tRNA）从受体位点到供体点点的转移。庆大霉素对假单胞杆菌的杀菌效果靠结合到细胞膜的外膜部分，置换本来存在的阳离子，使膜不稳定，在细胞表面形成空洞。
抗菌谱: 革兰氏阴性细菌，葡萄状球菌和其它的革兰氏阳性细菌。