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compendial test compendial methods united states compendia pharmacopoiea british indian impurity testing identification description biological samples bioanalysis solid phase extraction pretreatment of sample liquid liquid extraction rosiglitazone gliclazide triptic digestion hplc technique tryptic mapping vendor certification isolation and identification of impurity physical stability chemical stabity residual solvent inorganic impurity organic impurity degradation study swelling index herbal formulation foaming index evaluation crude drug extractive value simulatameous estimation