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Evolution of UV–vis spectrum with time for a solution containing 50 μM PEG-D (200 μM dopamine) and 100 μM of NaIO4 in 10 mM sodium phosphate buffered at pH 5.7. The absorbance was recorded between 0 and 60 min after the addition of NaIO4. The inset enlarges the absorbance at 310 to 330 nm.
