——————————————————————————–
Difference Between PURITY, ASSAY & POTENCY
——————————————————————————–
Purity:
It is calculated by area normalisation method, it can be directly find out by chromatograms obtained from HPLC.
% Purity = (Area of desired peak / Sum of area of all peaks) x 100
Assay:
It is calculated against standard. It may be of following types:
1) On as is basis = (Area of sample / Area of standard) x (conc. of standard / conc. of sample) x potency or assay of standard
2) On anhydrous basis = (Assay on as is basis / 100 – moisture) x 100
3) On dried basis = (Assay on as is basis / 100 – LOD) x 100
Potency:
100 – (moisture or LOD + residual solvents + heavy metals + sulphated ash + impurities)
Research Associate
Bioanalytical Research Dept.
Veeda Clinical Research Pvt. Ltd.
Shivalik Plaza – A, Near I.I.M.,
Ambawadi,
Ahmedabad-380015.
Mobile: +91-9898758004.
23.050000
72.667000