Automated chromatographic determination of chlorhexidine in pharmaceutical preparations.

An automated method for the determination of chlorhexidine (Hibitane) and its salts in formulated pharmaceutical products is described. The equipment consists of a high efficiency liquid chromatograph, a variable wavelength high sensitivity ultraviolet spectrophotometric detector, the output of which is monitored simultaneously by a suitable recorder, and a digital computer. The sample is automatically introduced onto a 10-cm silica gel column by use of a slide valve. Results are calculated and printed out by the computer.