期刊
CARBOHYDRATE POLYMERS
卷 250, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2020.116967
关键词
Hydrogels; Polysaccharide; Enzyme; Antioxidant property
资金
- French Ministere de l'Enseignement Superieur, de la Recherche et de l'Innovation
- Region Normandie
- European Union
A novel eco-friendly two-step synthesis process of neutral pullulan (PUL)-ferulic acid (FA) conjugates was re-ported in this work. Ferulic acid was first transformed to activated ferulate-imidazolide using N,N'-carbonyldiimidazole (CDI), a green activated reagent. Issued product was then reacted with pullulan. PUL-FA derivatives were characterized by FTIR and H-1 NMR leading to substitution degrees (DS) between 0.02 and 0.1 (mol FA per mol PUL repeat unit). The study in dilute regime indicated an associative behavior with the presence of aggregate structures in solution due to the hydrophobic interactions between the grafted FA onto polysaccharide backbones. Laccase from Trametes versicolor was then used to crosslink polysaccharide chains to obtain biomimetic PUL-FA hydrogels. Gelling's kinetics were analyzed with rheology in dynamic mode showing the impact of laccase amount, DS and concentration. Mechanical and swelling properties appear related only to DS and concentration of PUL-FA products.
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