Adsorption capacity of phenolic compounds onto cellulose and
     xylan

Costa, Telma dos Santos; Rogez, Hervé; Pena, Rosinelson da Silva

doi:10.1590/1678-457X.6568

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Research Paper • Food Sci. Technol (Campinas) 35 (2) • June 2015 • https://doi.org/10.1590/1678-457X.6568 copy

Adsorption capacity of phenolic compounds onto cellulose and xylan

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The interaction between three phenolic compounds (catechin, caffeic acid and ferulic acid) onto two dietary fibres (cellulose and xylan) has been evaluated to inquire possible interferences on the biodisponibility of phenolic compounds. The adsorption kinetics were performed using solutions containing 100 mg/L of phenolic compounds during a contact time ranging between 10 and 120 minutes at pH 2.0, 4.5, and 7.0. After the kinetics, isotherms were obtained using phenolic compounds concentration ranging between 10 and 80 mg/L during 60 minutes, at pH 2.0 and 7.0 and temperature of 36 °C. Results indicate that adsorbed quantities mainly changed in function of pH, however the maximum adsorption was only of 0.978 mg of caffeic acid/g of xylan at pH 2 and after 60 min. Redlich-Peterson model were able to predict the adsorption isotherms of all phenolic compounds onto cellulose, except for caffeic acid at pH 7.0. The low adsorption capacities observed suggest that both dietary fibres are unable to compromise the biodisponibility of phenolic compounds, especially in the small intestine, where they are partially absorbed.

cellulose; xylan; adsorption; phenolic compounds; isotherm; in vitro tests

	*Adsorption capacity, q_e* (mg/100 mg of cellulose)**
Time (min)	Catechin			Caffeic acid			Ferulic acid
Time (min)	pH 2	pH 4.5	pH 7	pH 2	pH 4.5	pH 7	pH 2	pH 4.5	pH 7
10	0.436	0.022	0.029	0.867	0.044	0.022	0.516	0.205	0.015
20	0.478	0.021	0.200	0.792	0.039	0.051	0.496	0.201	0.031
30	0.370	0.015	0.197	0.850	0.042	0.060	0.529	0.197	0.040
60	0.297	0.015	0.197	0.852	0.053	0.064	0.485	0.187	0.037
90	0.334	0.014	0.159	0.852	0.064	0.028	0.493	0.181	0.035
120	0.347	0.029	0.340	0.880	0.055	0.057	0.480	0.204	0.038

	*Adsorption capacity, q_e* (mg/100 mg of xilana)**
Time (min)	Catechin			Caffeic acid			Ferulic acid
Time (min)	pH 2	pH 4.5	pH 7	pH 2	pH 4.5	pH 7	pH 2	pH 4.5	pH 7
10	0.642	0.039	0.191	0.824	0.011	0.029	0.524	0.157	0.010
20	0.527	0.044	0.253	0.827	0.009	0.039	0.540	0.157	0.015
30	0.492	0.061	0.330	0.800	0.030	0.082	0.499	0.156	0.022
60	0.407	0.059	0.347	0.978	0.042	0.048	0.526	0.158	0.024
90	0.397	0.060	0.259	0.845	0.022	0.057	0.568	0.152	0.015
120	0.482	0.050	0.438	0.844	0.092	0.055	0.535	0.160	0.014

Phenolic compounds	Langmuir model				Freundlich model			Redlich-Peterson model
Phenolic compounds	*Q_M* (mg/g)	*a_L* (L/mg)	*K_L* (L/g)	R²	*K_F* (L/g)	*b_F*	R²	*K_R* (L/g)	*a_R* (L/mg)	*b_R*	R²
Catechin^a a pH 2.0.	7.52	0.0005	0.0032	0.9498	0.0056	0.91	0.9536	0.2715	47.72	0.09	0.9563
Catequin^b b pH 7.0.	32.99	0.0001	0.0009	0.8256	2×10^–6	2.63	0.9770	0.0163	547.65	–1.12	0.9605
Caffeic acid^a a pH 2.0.	0.94	0.0088	0.0083	0.9909	0.0148	0.75	0.9780	0.0070	3×10^–5	2.15	0.9988
Caffeic acid^b b pH 7.0.	0.09	0.0328	0.0031	0.5922	0.0089	0.46	0.5314	0.0022	0.0011	1.65	0.6187
Ferulic acid^a a pH 2.0.	0.69	0.0141	0.0098	0.9756	0.0212	0.65	0.9469	0.0075	9×10^–5	2.01	0.9873
Ferulic acid^b b pH 7.0.	0.17	0.0129	0.0022	0.9820	0.0051	0.64	0.9645	0.0016	6×10^–5	2.07	0.9931

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[1] *Corresponding author: rspena@ufpa.br