The hydroxyl (•OH)-radical-formation ability of the BP-Au NPs was monitored through the TA test. To do so, 1 mM (50 µL) of an aqueous solution of TA was mixed with the BP-Au NP solution (50 µL) and kept at room temperature for 10 min. Then, an H2O2 solution (10 mM, 50 µL) was added to it and after 30 min, the fluorescence intensity of the reaction product was recorded using a fluorescence spectrophotometer.
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