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(a) ζ-Potential of γ-oryzanol particles dispersed in water as a function of pH. (b) Structural representation of γ-oryzanol main chemical species. R1 OH: ester caffeates. R1 CH3: ester ferulates. R2 = terminal radical of cycloartenol or methylenecycloartenol. R3 = terminal radical of campesterol or β-sistosterol. Shaded grey = ionizable groups. The structures were drawn using the online platform of Fisher Scientific by Marvin JS ChemAxon (https://www.fishersci.com).
