Reference std is like USP,EP std , in this std we get COA

including results of Potency by HPLC , NMR & XRPD data.

whenever there is requirement of w.std preparation first we

have get API rawmaterial from warehouse & we check assay ,

water content or LOD & Related substances aganist reference

std . Some times we are doing analysis in duplicate & get

mean value.then we decide final assay or potency value &

it's validity one year