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Zeta potential values of the quercetin-loaded PLGA NPs after fresh preparation and storage in deionized water for 2, 4, 8, and 12 weeks at 4 °C and 30 °C. *, **, *** and **** indicate p < 0.05, 0.01, 0.001, and 0.0001 compared with day 0, respectively.
