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Absorption measurements at λ=520 nm performed in line with AF4 for 0%, 5%, and 10% PEG-PE liposomes. Each datum reflects the integrated absorbance intensity over a 3 min elution period centered on the liposome elution peak. Liposomes with 5% and 10% PEG-PE show significantly enhanced absorbance due to the presence of PEG on the liposomes.
