“…A variety of analytical methods have been developed for the quantitation of PHMB in various samples, e.g., spectrophotometry, capillary electrophoresis, colorimetric method, liquid chromatography, mass spectrometry, and titrimetric method. 50,[76][77][78][79] UV-vis spectrophotometry provides a simple and fast way to quantify PHMB in aqueous solutions based on the established calibration curve according to the maximum adsorption wavelength (approx. 235 nm).…”