Making Dense Covalent Arabinoxylan Gels with High Swelling Properties: A Strategy Based on Water Extraction through Osmotic Compression
| Autor: | Valerie Micard, Elizabeth Carvajal-Millan, Denis Cassan, Antoine Bouchoux, Carole Assor Antoine |
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| Přispěvatelé: | Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de Montpellier (UM)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro - Montpellier SupAgro, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Centro de Investigación en Alimentación y Desarrollo (CIAD), Consejo Nacional de Ciencia y Tecnología [Mexico] (CONACYT), Toulouse Biotechnology Institute (TBI), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
| Rok vydání: | 2021 |
| Předmět: |
mesh size
Polymers and Plastics Chemistry Process Chemistry and Technology cross-link density Organic Chemistry viscoelastic properties Water extraction high swelling capacity WEAX hydrogels Compression (physics) chemistry.chemical_compound Chemical engineering Covalent bond [SDV.IDA]Life Sciences [q-bio]/Food engineering Arabinoxylan medicine Swelling medicine.symptom osmotic compression |
| Zdroj: | ACS Applied Polymer Materials ACS Applied Polymer Materials, 2021, 3 (12), pp.6176-6185. ⟨10.1021/acsapm.1c01035⟩ |
| ISSN: | 2637-6105 |
| Popis: | International audience; Enzymatic oxidation of water-extractable feruloylated arabinoxylan (WEAX) solutions produces covalent irreversible gels that are stable versus time, pH, and T degrees C. These hydrogels have a huge water holding capacity, which makes them powerful encapsulation matrices. However, the high viscosity of the polymer makes it difficult to prepare concentrated WEAX solutions before gelation as well as impacts the enzymatic efficiency during gelation. This results in low concentrated gels-6% (w/v) max-that are mechanically brittle. In this study, we propose a strategy for producing more concentrated and less fragile hydrogels. It is based on the extraction of water from 1% (w/v) WEAX enzymatic gels using osmotic compression. This approach aims to reinforce the mechanical resistance of the gels before swelling while preserving their covalent network and swelling capacity. WEAX gels were concentrated in this way up to 12-22% (w/v). The compressed gels have viscoelastic properties that are 2 orders of magnitude higher than uncompressed ones. Interestingly, the compression also leads to a slight increase in gel connectivity, presumably through the creation of additional cross-links upon compression. This increase in connectivity has only a small impact on the swelling capacity of the gels, while it has the benefit of increasing their mechanical resistance after swelling. The swollen gels have a homogeneous structure with mesh sizes of similar to 200 nm, making them suitable for encapsulation applications. In addition, the compressed gels swell 10-20 times their initial volume, which is another interesting property that may be used for other specific applications. |
| Databáze: | OpenAIRE |
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