Identification Positive
PH (1%, W/V) 4.5-7.5
Specific rotation -203°- -216°
UV absorption at 353nm(1%,1cm) 290-310
UV absorption of impurity at 430nm
490nm
≤0.25
≤0.20
Related substances 4-epoxytetracycline : 0.5%Tetracycline hydrochloride: 2.0%
ain peak tailing: 2.0%
Heavy metal 50ppm
Water 4.0-8.0%
Ash ≤0.5%
Assay (HPLC) 95.0-100.5%
PH (1%, W/V) 4.5-7.5
Specific rotation -203°- -216°
UV absorption at 353nm(1%,1cm) 290-310
UV absorption of impurity at 430nm
490nm
≤0.25
≤0.20
Related substances 4-epoxytetracycline : 0.5%Tetracycline hydrochloride: 2.0%
ain peak tailing: 2.0%
Heavy metal 50ppm
Water 4.0-8.0%
Ash ≤0.5%
Assay (HPLC) 95.0-100.5%