Enhancement of UV absorbance and mechanical properties of chitosan films by the incorporation of solvolytically fractionated lignins
| Autor: | Jalel Labidi, Oihana Gordobil, Eduardo Robles, Nagore Izaguirre |
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| Rok vydání: | 2020 |
| Předmět: |
Chitosan
Ultraviolet Rays Organosolv technology industry and agriculture Ethyl acetate macromolecular substances General Medicine Chemical Fractionation Lignin Biochemistry Molecular Weight Physical Phenomena Absorbance chemistry.chemical_compound chemistry Structural Biology Ultimate tensile strength Solvents Acetone Molecular Biology Kraft paper Nuclear chemistry |
| Zdroj: | International Journal of Biological Macromolecules. 155:447-455 |
| ISSN: | 0141-8130 |
| Popis: | In this work, an effective sequential organic solvent extraction of kraft and organosolv lignins was carried out to separate lignin into more homogeneous fractions with specific properties. The selected solvents were ethyl acetate, ethanol, methanol, and acetone in that order. Fractions were analysed in terms of their yield, molecular weight, S/G ratio, and phenolic hydroxyl groups content. The incorporation of lignin fractions into the chitosan was aimed to increase the UV absorbance and the mechanical resistance of the chitosan films, which would provide good properties for applications in the packaging field. Films were analysed in terms of UV–vis absorption spectra, tensile strength, as well as colour changes. Results showed a significant increase in the absorbance of UV-A and UV-B with the addition of lignin fractions, mechanical properties showed an increase in the ultimate tensile strength in case of kraft fractions, while organosolv fractions do not affect tensile strength significantly. |
| Databáze: | OpenAIRE |
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