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Quenching of O2•− from KO2 at varying pH. (A) EPR spectrum of O2•− in 50 mM NaOH in the presence and absence of PEG-HCCs. PEG-HCCs are able to quench O2•−. (B) Quenching of O2•− at varying pH values; 20 mM KO2 in DMSO was dissolved in different 50 mM buffers.
