Azithromycin dihydrate is a broad spectrum macrolide antibiotic structurally related to erythromycin. Azithromycin dihydrate is sparingly soluble in aqueous solution (0.54 mg/mL).
CAS Number
117772-70-0
Molecular Formula
C38H72N2O12•2H2O
Molecular Weight
785.01
Mechanism of Action
Macrolide antibiotics inhibit bacterial growth by targeting the 50S ribosomal subunit preventing peptide bond formation and translocation during protein synthesis. Resistance to azithromycin is commonly attributed to mutations in 50S rRNA preventing azithromycin binding allowing the cell to synthesize proteins free of error.
Storage Conditions
≤30°C
Tariff Code
2941.50.0000
Spectrum
Several members of gram positive and gram negative bacteria as well as certain mycoplasma species are susceptible to azithromycin.
Form
Powder
Appearance
White crystalline powder
Source
Semi-synthetic
Water Content (Karl Fisher)
4.0-5.0%
pH
9.0 - 11.0
Optical Rotation
-45° to -49º
Assay
(On Dried Basi): 945-1030 µg/mg
Residue On Ignition
≤0.3%
Heavy Metals
≤25ppm