Table 1.

FTIR vibrational modes.

Vibrational modes	Formulations
	Lipopolymer		Lipopolymer + l-arginine		Lipopolymer + l-cysteine		Lipopolymer + l-tryptophan
	0 cycles	15 cycles	0 cycles	15 cycles	0 cycles	15 cycles	0 cycles	15 cycles
+N(CH3)3	968	972	970	968	970	974	970	970
P = O	1244	1238	1246	1244	1246	1244	1246	1244