Potential of Lignins as Antioxidant Additive in Active Biodegradable Packaging Materials

Lien vers la version éditeur: http://link.springer.com/article/10.1007/s10924-013-0570-6Due to their polyphenolic structure lignins bear a number of interesting functional properties, such as antioxidant activity. Natural antioxidants are very much looked for in the aim of protection of light or oxygen sensitive goods and are being used in active packaging. Poly(lactide) (PLA)-lignin films were prepared by twin screw extrusion followed by thermo-compression using two different commercial sources of alkali lignins obtained from gramineous plants. A good dispersion of lignin in the matrix was observed. Mechanical properties of the compounded material were merely diminished and oxygen barrier properties slightly enhanced. The chromatographic study of the lignins revealed that the low molecular weight fraction of both lignins increased during the polymer processing. The migration of low molecular weight compounds in an ethanol/water solution simulating fatty foodstuff was performed and the antioxidant activity of the extract was analysed. It was found that the activity increases with increasing severity of the heat treatment because of the generation of free phenolic monomers during processing. These results open an interesting way for application of lignins as an active compound in packaging materials. Lignins do not impair the mechanical and barrier performance of the polymer and the plastics processing even allows for the generation of active substances

Potentialité des lignines comme additif fonctionnel dans des matériaux biodégradables

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Valorisation of industrial lignon as additive with antioxidiant properties in PLA

Lignins are complex phenolic polymers. They are one of the main byproducts of mainly industries. The valorisation of lignin is therefore a key issue in the economic performance of these industries. One of the functional properties of lignin is an antioxidant action, the efficiency of which is closely linked to the lignin structure. Small phenolic compounds seem to play an important role in the antioxidant potential. In this work we studied the effect of the dispersion of an alkali lignin sample (Protobind 1000, Granit SA) in poly(lactic acid) on the properties of thermoformed films. The lignin was incorporated in the polymer with the help of a twin screw extruder and film samples were obtained by thermocompression. The effect of the fabrication process on lignin structure was investigated by size exclusion chromatography (SEC) and GC-MS. The barrier properties of the different samples were investigated through permeability measurements. The antiradical activity was assessed by DPPH radical scavenging tests. The analysis of lignin structure in the film samples showed that the process increase the proportion of small phenolic compounds, such as ferulic and rho-coumaric acids

Abstracts of 1st International Conference on Computational & Applied Physics

This book contains the abstracts of the papers presented at the International Conference on Computational & Applied Physics (ICCAP’2021) Organized by the Surfaces, Interfaces and Thin Films Laboratory (LASICOM), Department of Physics, Faculty of Science, University Saad Dahleb Blida 1, Algeria, held on 26–28 September 2021. The Conference had a variety of Plenary Lectures, Oral sessions, and E-Poster Presentations. Conference Title: 1st International Conference on Computational & Applied PhysicsConference Acronym: ICCAP’2021Conference Date: 26–28 September 2021Conference Location: Online (Virtual Conference)Conference Organizer: Surfaces, Interfaces, and Thin Films Laboratory (LASICOM), Department of Physics, Faculty of Science, University Saad Dahleb Blida 1, Algeria