| Sumario: | - Viscosity measurement and molecular weight determination: Figure S-1. Huggins and Kramer plot for our pectin. - Criteria to fit kinetic adsorption experiments: Table S1. Table with model used to fit kinetic adsorption experiments and parameters qmax, K1, K2, adjusted R2 (Adj. R2), Akaike information criterion (AIC) and Bayesian information criterion (BIC) for the kinetic experiments for the cross-link of pectin by Ca2+, Eu3+ and P-Ca2+ by Eu3+. PFO: Pseudo First Order kinetic model. PSO: Pseudo Second Order kinetic model. Figure S-2. Adsorption kinetic experiments for the cross-link of LM pectin (P-NC) by Ca2+ (a),Eu3+ (b), and P-Ca2+ by Eu3+ (c). Each graph shows the fitting by the pseudo first order (PFO) and pseudo second order (PSO) kinetic models. Figure S-3. Scanning electronic microscopy images of pectin-based films with (a) neat pectin, and cross-linked with (b) Ca, (c) Eu and (d) Ca+Eu. On these images, EDX was performed. Table S2. Element content of neat pectin, Pe-Ca, Pe-Eu and Pecin-Ca – Eu obtained by EDX.
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