How to make a 50 mg/ml Kanamycin Stock Solution
Weigh 0.5 g of Kanamycin Monosulfate. 
Add 10 ml of sterile H2O.
Disolve completely.
Prewet a 0.2 µm syringe filter by drawing through 5-10 ml of sterile H2O and discard water.
Sterilize Kanamycin Stock through the prepared 0.2 µm syringe filter.
Stock may be kept at -20°C for 1 year.
