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(Left) scheme of polygalacturonic acid (PgA) de-protonation and scheme of poly (acrylic) acid (PAA) coils; (Right): PgA at different pH; (A) Distilled water; (B) pH 10; (C) pH 7.2; (D) pH 3. TEM images of (i) PAA at alkaline pH and (ii) PAA at acidic pH. (Arrows indicate different nanoparticles shape).
