Publications by authors named "Helene de Baynast"
Article Synopsis
- This study focuses on enhancing the properties of industrial lignin using an enzymatic process involving laccase from a specific type of fungus, tested under various pH levels and concentrations with a mediator.
- The optimal conditions found were a pH of 4.5 over longer incubation times, which increased laccase activity against kraft lignin.
- Multiple analytical techniques, including FTIR, DSC, and GC-MS, were used to analyze the structural changes and chemical modifications of lignin, confirming that laccase treatment can effectively modify marine pine kraft lignin.
Chitosan is a bio-sourced polysaccharide widely used in different fields from health to wastewater treatment through food supplements. Another important use of this polymer is adhesion. Indeed, the current demand to replace non-natural and hazardous polymers by greener ones is well present in the adhesive field and open good opportunities for chitosan and its derivatives.
View Article and Find Full Text PDFA chemical modification by grafting alkyl chains using an octanal (C8) on chitosan was conducted with the aim to improve its water resistance for bonding applications. The chemical structure of the modified polymers was determined by NMR analyses revealing two alkylation degrees (10 and 15%). In this study, the flow properties of alkyl-chitosans were also evaluated.
View Article and Find Full Text PDFThe gum asafoetida, an oleo-gum-resin from root of Ferula assa foetida, was extracted through alcoholic procedure followed by water extraction and then biochemically characterized using colorimetric assays, Fourier infrared spectroscopy, gas chromatography coupled to mass spectrometry, and 1D and 2D nuclear magnetic resonance. The gum was mainly composed of carbohydrates (67.39% w/w) with a monosaccharide distribution of 11.
View Article and Find Full Text PDF