losartan potassium, valsartan , telmisartan and irbesartan are angiotensin-ii-receptor antagonists (ara ii) group which used in treatment of hypertension alone or in combination with other drugs mainly hydrochlorothiazide. rp- hplc method was developed for the assay of three angiotensin-ii-receptor antagonists (ara-iis) in presence of hydrochlorothiazide. the method was performed by reversed ph...

in the present work a ph-dependent cloud point extraction procedure using ph-sensitive hydrogel polymer was applied for preconcentration and spectrophotometric determination of the hg(ii) as its thio micher's ketone complex. central composite design (ccd) and response surface method were applied to design the experiments and find out the optimum conditions. four factors entitled concentration o...

gabapentin is an anticonvulsant widely used in the treatment of epilepsy.an accurate and validated spectrophotometric method was developed as an alternative method to determine gabapentin in pharmaceutical products. this is a simple, accurate, precise, selective and visible spectrophotometric method. the method is based on the measurement of drug absorbance as a result of yellow solution format...

a carbon ionic liquid electrode (cile) modified with tio2-fe nanoparticles was constructed by incorporating tio2-fe nanoparticles into the paste matrix. under the optimized experimental conditions, using differential pulse voltammetry (dpv), the oxidation of thiocyanate and oxalate were occurred at potentials of 0.740 v and 1.010 v, respectively, at the surface of the modified electrode. observi...

a sensitive and selective procedure was developed for the spectrophotometric determination of silver by its catalytic effect on the oxidation of gallocyanine by peroxydisulphate in acidic media at 540 nm. silver can be determined in the range of 0.001-0.500 µg/ml with a limit of detection of 0.0005 µg/ml, by a fixed-time method of 4.0 min from initiation of the reaction, the relative standard d...