  In this paper the problem of surface charge of the lipid membrane immersed in
the physiological solution is considered. It is shown that both side of the
bilayer phospholipid membrane surface are negatively charged. A self-consistent
model of the potential in solution is developed, and a stationary charge
density on the membrane surface is found. It is shown that the ions of the
surface charge are in a relatively deep (as compared to kBT) potential wells,
which are localized near the dipole heads of phospholipid membrane. It makes
impossible for ions to slip along the membrane surface. Simple experiments for
verifying the correctness of the considered model are proposed. A developed
approach can be used for estimations of the surface charges on the outer and
inner membrane of the cell.
