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A DPPH assay was used to assess the radical scavenging capacity of Q-3-G. Methanol was used to dissolve DPPH to a final concentration of 250 μM. Then, 475 mL of DPPH was reacted with 5 mL of Q-3-G (0–40 μM) or AA (500 mM) at 37 °C for 30 min. The positive control was AA. The determination of the DPPH scavenging effect and calculation were performed as described previously [86].
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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
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