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• W2052776302 abstract "Small amounts of papaverine (about 3 mg in 15 ml solution) can be determined heterometrically in the presence of thiocyanate by titration with cobaltous solution. A strong electrolyte (Na2SO4) must be added to obtain a clear endpoint. The titration can be carried out in the presence of large amounts (97%) of quinine and ephedrine. The titration takes 2–3 min and the error rarely exceeds 1%. Papaverine, quinine, and ephedrine can be determined individually by spectrophotometry as their cobaltothiocyanates, which are extracted in 30% cyclohexanone in carbon tetrachloride, and the optical density measured at 625 nm. The method is reproducible at milligram levels with a standard deviation of ±0.3% for papaverine and quinine and = 0.5% for ephedrine." @default.
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• W2052776302 date "1983-03-01" @default.
• W2052776302 modified "2023-09-25" @default.
• W2052776302 title "The spectrophotometric and heterometric determination of some alkaloids as cobaltothiocyanates" @default.
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• W2052776302 doi "https://doi.org/10.1016/0026-265x(83)90024-3" @default.
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