Oxolinic acid CAS NO.14698-29-4

characteristics

an almost white or pale yellow crystalline powder

identification

1. uv absorption max at 260、322and336nm.

2. ir spectra is consistent with crs.

3. tlc

appearances of solution

clear and not more intensely coloured than reference solution b

related substance（by tlc)

impurity b ≤0.2%

impurity a and c ≤0.4%

loss on drying

≤0.5%

sulphated ash

≤0.1%

heavy metals

≤10ppm

assay

98.0%~102.0% of c13h11no5 on dried basis