Besides the presence of other ions peaks,all the mass spectra of these antibiotics showed a characteristic ion peak at m/z 163.1 belonging to the protonated ion of 2-deoxystreptamine.

• 除其它特征碎片离子峰外；所有测试样品的质谱图中都存在质荷比为163.；1的归属于2-脱氧链霉胺的碎片离子峰。