Table I.

Properties of Cationic Liposomes

Composition CX-Y a	DOTAP (%)	mPEG-DSPE (%)	DPPC (%)	Cholesterol (%)	Size (nm)	Poly-dispersity index	Zeta potential (mV)
C0-0	0	0	30	50	126	0.04	4.1
C5-0	5	0	25	50	128	0.06	17.5
C10-0	10	0	20	50	133	0.07	21.8
C20-0	20	0	10	50	132	0.07	35.7
C40-0	40	0	0	40	135	0.09	46.2
C50-0	50	0	0	30	131	0.11	56.2
C20-1	20	1	9	50	133	0.07	35.4
C20-2	20	2	8	50	136	0.09	32.8
C20-5	20	5	5	50	140	0.09	30.9
C40-1	40	1	0	39	136	0.10	45.4
C40-2	40	2	0	38	137	0.08	44.4
C40-3.5	40	3.5	0	36.5	140	0.14	42.1
C40-5	40	5	0	35	142	0.06	40.8
C40-7	40	7	0	33	142	0.16	39.3

All formulations contained 1% rhodamine-labeled DOPE and 19% DOPE

^a X = mol.% DOTAP, Y = mol.% PEG