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This work proposes thermal characterization as analytical methodology for the identification and purity assay of warifteine, an alkaloid in Cissampelos sympodialis Eichl. Thermal and kinetic parameters were determined by means of TG and DSC photovisual studies. The TG results showed that the decomposition of warifteine in air and nitrogen atmospheres proceeds in three and four steps, respectively. The TG data allowed calculation of the kinetic parameters of warifteine. The activation energy values obtained by different methods displayed a good correlation. With the DSC photovisual system applied it is possible to detect the impurity level in warifteine after its purification.

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Introduction Warifteine, a bisbenzylisoquinoline alkaloid from Cissampelos sympodialis Eichl., produces a reversible, nonspecific, and noncompetitive antagonism of histamine, carbachol, and bradykinin. It induces contractions

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