The withdrawn cefoxitin acid organic saturated solutions were diluted with corresponding organic solvent while the cefoxitin acid methanol aqueous saturated
solutions were diluted with phosphate buffer to an appropriate
concentration for UV analysis. Absorbance of standard
solutions and samples were determined at 262 nm by an U-3010
UV–VIS Spectrophotometer (Hitachi High-technologies Co., Tokyo,
Japan)