http://nopr.niscpr.res.in/handle/123456789/852 2026-10-09T23:21:22Z http://nopr.niscpr.res.in/handle/123456789/900 Title: Synthesis and photoinduced conductivity changes of polyesters with ortho-hydroxyazo groups Authors: Girijan, K R; Purushothaman, E Abstract: The synthesis and photoinduced changes in conductivity of polyesters with ortho-hydroxyazo groups in the polymer backbone are presented. Reversible photoincrease in conductivity was observed. A reasonable explanation to this effect has been offered. Page(s): 197-200 2008-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/899 Title: Spectrophotometric determination of eprosartan mesylate in raw material and experimental tablets Authors: Kamila, M M; Mondal, N; Ghosh, L K Abstract: A simple, sensitive and accurate UV spectrophotometric method has been developed for the determination of eprosartan mesylate in raw material and experimental tablets. Beer’s law was obeyed in the concentration range 2-30 μg mL⁻¹ for the drug (λ = 232 nm) with an apparent molar absorptivity and Sandell sensitivity of 2.8 × 10⁴ L.mol⁻¹cm⁻¹ and 0. 01854 µg cm⁻²/0.001A, respectively. The limits of detection and quantitation were calculated to be 0.3623 and 1.098 µg mL⁻¹, respectively. Results were validated statistically according to ICH guidelines. Validation of the method yielded good results in the concerning range (2-30 µg mL⁻¹), linearity (r² = 0.9998), precision and accuracy. The excipients present in the experimental tablets did not interfere with the method. Page(s): 194-196 2008-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/898 Title: o-Chlorophenol anchored tin antimonate: An ion exchanger for separation of heavy metals Authors: Chithra, P G; Beena, B Abstract: An inorgano-organic ion exchanger (SnSboCP) has been prepared by anchoring o-chlorophenol onto tin antimonate (SnSb). The ion exchanger has been characterized by elemental, spectral and thermal analysis. Chemical stability of the exchanger in acidic, basic and organic media has been assessed. Ion exchange capacity (i.e.c) has been determined and distribution behaviour towards several metal ions in different electrolyte solutions with varying concentrations has been studied and a few binary separations achieved. Page(s): 190-193 2008-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/897 Title: Determination of palladium using 2-thiobarbituric acid as a releasing agent Authors: Karthikeyan, J; Parameshwara, P; Shetty, A Nityananda; Shetty, Prakash Abstract: A simple, rapid and accurate complexometric method for the determination of palladium(II) is proposed, based on the selective masking property of 2-thiobarbituric acid towards palladium(II). In the presence of diverse metal ions, palladium(II) is complexed with excess of EDTA and the surplus EDTA is backtitrated with standard zinc sulphate solution at pH 5-6 (acetic acid-sodium acetate buffer) using xylenol orange as indicator. An excess of a 0.3% solution of 2-TBA is then added to displace EDTA from Pd(II)-EDTA complex. The released EDTA is titrated with the same standard zinc sulphate solution as before. Reproducible and accurate results are obtained in the concentration range 1.30-20.00 mg of palladium with relative error of 0.50% and coefficient of variation not exceeding 0.45%. The effects of diverse ions are studied. The method is used for the determination of palladium in alloys, hydrogenation catalysts and complexes. Page(s): 186-189 2008-03-01T00:00:00Z