Suspend 39g/liter,autoclave(15min at 121℃).Allow to cool to 45-50℃;add ,where necessary,gentamicin sulphate corresponding to 20mg of gentamicin base and pour into Petridishes. 稱取本品39.0g,加熱攪拌溶解於1000ml純化水中,分裝三角瓶121℃高壓滅菌15分鍾,冷至45-50℃左右時,如果需要可加入過濾除菌的硫酸慶大黴素20mg (每升培養基),混勻,傾入無菌平皿。