Journal
CARBOHYDRATE POLYMERS
Volume 181, Issue -, Pages 275-284Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.10.084
Keywords
Polyvinyl alcohol; Chitosan; Lignin nanoparticles; Hydrogels; Antioxidative; Antibacterial
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Funding
- China Scholarship Council (CSC)
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Polyvinyl alcohol/chitosan (PVA/Ch) hydrogels containing 1 and 3 wt% of lignin nanoparticles (LNPs) were prepared through a freezing-thaw procedure. Results from microstructural, thermal and mechanical characterization of LNPs based PVA/Ch demonstrated that the lowest amount of LNPs (1 wt%) was beneficial, whereas the presence of agglomerates at higher LNP content limited the effect. Moreover, a different swelling behaviour was observed for hydrogels containing LNPs with respect of PVA/Ch, due to the formation of a porous honeycomb-like structure. A synergic effect of Ch and LNPs was revealed in terms of antioxidative response by DPPH (1,1-Diphenyl-2-picryl-hydrazyl) activity of migrated substances, whereas results from antimicrobial tests confirmed LNPs as effective against Gram negative bacteria (E. coli) when compared to Gram positive (S. aureus and S. epidermidis) strains. The obtained results suggested the possible use of produced PVA/Ch hydrogels incorporating LNPs in many different sectors, such as drug delivery, food packaging, wound dressing.
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