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(A) Mechanistic depiction of the 2-MH2Q-initiated Fenton reaction via the formation of a radical semiquinone species and oxidation to 2-MQ; (B) quantification of Fe3+ reduction by H2Q using a colorimetric ferrozine-based assay (sodium acetate [NH4OAc] buffer, pH 4). Error bars indicate ±0.5 standard deviation (n = 3). Abs. λ562 nm, absorbance at a wavelength of 562 nm; NC, negative control.
