Adsorption capacity of phenolic compounds onto cellulose and xylan

Abstract

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.

Adsorption between Quercetin Derivatives and β-Glucan Studied with a Novel Approach to Modeling Adsorption Isotherms

“…Particular adsorption isotherms, Langmuir and Dubinin-Radushkevich, are chosen for this study due to their use in earlier studies. Namely, the applicability of Langmuir models for adsorption of polyphenols onto β-glucan [16,17], polyphenols from apples onto resin [38], apple procyanidins onto apple cell wall material [34,36,37], various polyphenols onto cellulose and xylan [9], various polyphenols onto cellulose [10] has been reported. Then Dubinin-Radushkevich isotherm was used to model the adsorption of polyphenols onto tannery shavings [18].…”

“…Quality fitting and interpretation of adsorption can be achieved by non-linear and linear regression. In some papers, the adsorption data were analyzed with non-linear regression [7,9,10,17,34,36,37] and in some with the use of linear regression [18]. Between those two types of modeling, non-linear has shown advantages, since linear fitting have already shown many constrictions [28].…”

“…This means that dietary fibers can interact with polyphenols in the digestive tract and potentially "carry" them to the lower parts of the digestive tract in non-metabolized form where they can potentially show some positive bioactivities. It has been already shown that polyphenols can interact with cellulose [9][10][11], cellulose based composites [7] or xylan [9]. Furthermore, β-glucan is one of common dietary fibers that can be found in certain cereals [12].…”

Tequila Agave Bagasse Hydrolysate for the Production of Polyhydroxybutyrate by Burkholderia sacchari

“…The pH can affect its absorption capacity because it can influence the nature of functional groups for both adsorbent and adsorbate. Weak organic acids and phenolic compounds are better absorbed when they are in a non-ionized state (pH < 4) [34], this could be a possible explanation for the slight increase in the elimination of phenolic compounds at pH 2.…”

A Low-Cost Video-Based Reflectometer for Selective Detection of Cu2+ Using Paper-Based Colorimetric Sensors

“…33 On the other hand, AAQX is a polyfunctionalized molecule containing alcohol, amine, amide and quinoxaline moieties, which are able to interact with available hydroxyl groups of the cellulose fibers contained in paper via hydrogen bonds, and this fact opened a possibility for immobilizing AAQX on a paper support in attempt to develop a disposable sensor. For decades, the literature has been presenting examples in which hydrogen bonds are the main interaction in the adsorption of polyols, phenols and amines, among other chemical species to cellulose chains, [38][39][40][41][42] strongly suggesting that this type of interaction is involved in the adsorption mechanism of AAQX to the paper strips. One important feature related to AAQX is its low solubility in water, which ensures that the chemosensor remains adsorbed to the paper strip after immersion in aqueous solution.…”