Decolorization of Corn Fiber Arabinoxylan Extract with (MN102) Resin

Weng, Verónica; Gago, Diana; Brazinha, Carla; Alves, Vítor D.; Coelhoso, Isabel M.

http://hdl.handle.net/10362/187600

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Arabinoxylan is a polysaccharide with film-forming properties, present in corn fiber, and a low-value by-product. The extract has a deep brown color, producing films of the same shade, which may not be appealing. This study addresses, for the first time, the adsorption of colored compounds present in an arabinoxylan extract using resin MN102. The resin successfully adsorbed the colored compounds from the arabinoxylan extract. After four consecutive adsorption/desorption cycles, the efficiency of the resin was similar, only decreasing from 63.3% to 52.9%. Langmuir and Freundlich models were fitted to the results of adsorption isotherm experiments, with the Freundlich model demonstrating the best fit to the experimental results. A fixed-bed column loaded with the resin was used for the removal of the colored compounds from the arabinoxylan extract, and the effect of the volumetric flow rate was investigated. The Yan and log-Gompertz models showed the best fit to the experimental breakthrough curves. This study systematically evaluated the adsorption conditions, providing a comprehensive analysis of the performance of the resin in the removal of the colored compounds. Additionally, the ability of the extract to maintain its film-forming properties after decolorization was evaluated, and some of the film’s key characteristics were evaluated, namely its color, solubility in water and mechanical properties.

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Funding Information: This project was funded by the PhD Fellows grant awarded by the Fundação para a Ciência e Tecnologia, I.P., with the project references 2021.08511.BD and 2020.05529.BD and DOI identifiers https://doi.org/10.54499/2021.08511.BD and https://doi.org/10.54499/2020.05529.BD. This research was also supported by the Associate Laboratory for Green Chemistry—LAQV—which received financial support from the FCT/MCTES (LA/P/0008/2020 DOI 10.54499/LA/P/0008/2020, UIDP/50006/2020 DOI 10.54499/UIDP/50006/2020 and UIDB/50006/2020 DOI 10.54499/UIDB/50006/2020) using national funds. This work was also funded by national funds provided by the FCT—Fundação para a Ciência e a Tecnologia—I.P., under project UIDB/04129/2020 of the LEAF—Linking Landscape, Environment, Agriculture and Food—Research Unit. Publisher Copyright: © 2025 by the authors.