I need to prepare 10ml of 1000ppm(ug/ml) of streptomycin stock solution. So i need to weigh out 10mg of pure streptomycin and dissolve in 10ml of water. But I have with me a Sigma Streptomycin sulfate with formula C21H39N7O12. 1.5H2SO4 and MW=728.69, moisture content of 6% and potency 749units streptomycin base per mg on dried basis. How to calculate how much of this streptomycin sulfate to weigh which is equivalent to 10mg of pure streptomycin? Do i have to convert unit/mg into ug/mg? Anyone please help?
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