Characterization of ciprofloxacin liposomes: derivative ultraviolet spectrophotometric determinations.

Neutral, (-) and (+) charged CF encapusulated liposome formulations prepared with EPC:Chol and DPPC:Chol lipids were investigated for their loading capacity, encapsulation % and release properties. CF amounts in the liposomes were estimated using derivative UV spectroscopy. Among the liposome formulations DPPC:Chol and EPC:Chol neutral formulations had a significantly higher loading capacity and slowest release rate compared with (-) and (+) charged liposomes. The derivative UV spectroscopy was found to be an easy and sensitive method for direct estimation of CF in liposomes.