Analysis of the dielectric relaxation property of phospholipid monolayers by Maxwell displacement current measurement

Using the Maxwell displacement current (MDC) measurement with alternating m onolayer compression and expansion process, the dielectric property of mono layers has been investigated. The monolayer expansion and compression proce sses were analyzed on the basis of the Debye theory, and the relaxation tim e of DL-alpha-dilaurylphosphatidylcholine (DLPC) was determined using a who le curve of MDCs. It was suggested that the interaction among molecules mak es a contribution to the dielectric relaxation phenomena, although the chan ge in the orientational order of polar molecules is a main contribution of MDC. (C) 1999 Academic Press.