Abstract
The thermoanalytical purities of two sulfapyridine samples, drug (I) and standard (II), have been studied with different methods. By transparency measurement the fusion temperatures and intervals indicate a lower percentage of impurity for (II) than for (I). By means of two thermal analyzers the authors have shown the good agreement of the results: 99.790±0.047% and 99.800±0.045% (I). Heat-flux differential scanning calorimetry is the only method able to give precisely the degree of purity of (II): 99.956±0.028 %, this value being a limit for the power-compensation differential scanning calorimetry analysis (DSC 1B).
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