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The absorption bands corresponding to asymmetric oscillations of CH2 groups of (A) MNP-free non-PEGylated and PEGylated liposomes and (B) MNP-free and MNP-containing PEGylated liposomes. Liposome composition: eggPC/Chol (85:15 mol/mol); eggPC/DSPE-PEG2000/Chol (81:4:15 mol/mol); or eggPC/DSPE-PEG2000/Chol (81:4:15 mol/mol) containing 1.8% wt. eggPC-coated 5 nm MNP. Liposome concentration was 12 mg lipid/ml in 10 mM PBS (pH=7.4) at 22°C.
