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Gallic acid solution preparation
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Non-oxidised gallic acid (GA) stock solution was prepared by dissolving 10 mM gallic acid in the reaction solution. Oxidised gallic acid (GAO) stock solution was prepared by dissolving 10 mM gallic acid in a 100 mM sodium phosphate (Carl-Roth, cat. No. P030.3 and T879.2, purity > 99%) buffer (pH 7.4). Oxidation was achieved by incubating the solution at 37 °C for 15 days. Absorbance spectra of GA at the start and end of the reaction were scanned in the range from 250 to 800 nm to confirm changes to its structure (Fig. S1).
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