Hi, I'm new in this field. My customer gave me some antibiotic in powder and liquid form and would like me to prepare antibiotic disc for antibiotic sensitivity test. I'm confused on the calculation and units though.
Amoxicillin, each gram contain 500mg. Dosage used: 100g/100 gallons drinking water.
So I just take 0.264g and mix with 1L water for my antibiotic solution and then pipette 50ul onto my paper disc.
So the disc concentration would be 132ug/ml.
Am I correct? Then how about the commercial disc that having disc potency 2mcg? Meaning the disc I prepared is actually less concentrated than the commercial disc?
Please hep me on this. Thank you.