For the aerosol OT reversed micelle systems in n-dodecane, n-heptane, and benzene, the effect of solubilized H2O and D2O on the C-13 NMR spin-lattice relaxation for the two carbonyl carbons of an AOT molecule has been investigated in connection with the AOT-water interaction. The contribution of water molecules to the observed spin-lattice relaxation rate was calculated. The results lead to the conclusion that the carbonyl group of the alpha-chain is more tightly bound to water molecules than that of the alpha-chain. It has also been discussed that the difference in an interaction between the carbonyl group and water molecule is reflected in the C-13 chemical shift variation of the two carbonyl carbons.