Abstract
Abstract A colorimetric determination of benzocaine by a modified Bratton-Marshall procedure has been developed for ear drops in water-soluble bases, suppositories in water-soluble bases, and throat lozenges. The method is applicable to concentrations normally found with these materials and does not require extensive cleanup. Other primary aryl amines, alkali iodides, and antipyrine in concentrations over 10 times the benzocaine content interfere in the method. Collaborative results indicate recoveries averaging 98.4—99.4% with standard deviations of 2.12-2.40%. It is recommended that the method be adopted as official, first action.
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