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Matrix Assisted laser Desorption Ionization Time of Flight(MAlDI-TOF)-Mass Spectrometry and^(13)C-NMR-Identified New Compounds in Paraberlinia bifoliolata(Ekop-beli)bark Tannins

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Journal of Renewable Materials 2024年第3期12卷 553-568页

作者： liliane Nga benoit Ndiwe Achille bernard b.wolé Antonio Pizzi jean jalin eyinga b.wole Joseph Zobo Mfomo laboratory of Forest Resources and wood Valorization Training Unit in Engineering SciencesPost Graduate School of Fundamental and Applied SciencesUniversity of DoualaP.O.Box 1872DoualaCameroun laboratory of Mechanics Training Unit in Engineering SciencesPost Graduate School of Fundamental and Applied SciencesUniversity of DoualaP.O.Box 2701DoualaCameroun laboratory of Studies and Research on wood Material(lERMAb) University of LorraineNancyFrance

Extracts of plant origin,particularly tannins,are attracting growing interest for the sustainable development of materials in the industrial *** discovery of new tannins is therefore *** aim of this work was to contribute to the understanding of the properties of Paraberlinia bifoliolata tannin by Matrix Assisted laser Desorption Ionization Time of Flight Mass Spectroscopy MAlDI-TOF/MS and Carbon 13 Nuclear Magnetic Resonance(13C NMR).The chemical composition of tannin extracted from Paraberlinia bifoliolata bark was determined,as was the mechanical strength of the resin hardened with Acacia nilotica *** by successive water extraction was 35%.MAlDI-TOF/MS analysis revealed the presence of three new compounds in this tannin,previously unknown in this family of *** are 3-hydroxyproline acid,N-methyl-4-hydroxypipecolic acid and N-methyl-5-dihydroxypipecolic *** identification of the above molecules means that this tannin can be used for industrial applications,as a resin in the manufacture of particleboard and in the formulation of green corrosion *** information is reinforced by 13C NMR spectrometry,which indicates the presence of several polyflavonoid units,confirming the condensed nature of the *** analysis of the resin formed by the purified tannin of Paraberlinia bifoliolata to which a vegetal biohardener has been added provided a Modulus of Elasticity(MOE)value of 4840 MPa at 150℃,confirming its possible use as a binder resin in the manufacture of wood panels as well as for the formulation of a corrosion inhibitor.

关键词： Tannin Paraberlinia bifoliolata Central African wood species MAlDI-TOF/MS 13C NMR bark extracts thermomechanical behaviour wood-binder

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A Review of the Advances Made in Improving the Durability of welded wood against water in light of the Results of African Tropical woods welding

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Journal of Renewable Materials 2023年第3期11卷 1077-1099页

作者： jean jalin eyinga b.wôlé Achille bernard b.wolé Antonio Pizzi Joseph Zobo Mfomo César Segovia Atangana Ateba Evariste Fedoung Fongnzossie Sahbi Ouertani Xinyi Chen bénoît Ndiwe DieudonnéAbessolo Pierre-jean Meausoone laboratory of Forest Resources and wood Valorization University of DoualaP.O.Box.2701DoualaCameroon laboratory of Mechanics University of DoualaP.O.Box.2701DoualaCameroon CETElOR University of LorraineP.O.Box.21042EpinalFrance ENSTIb-lERMAb University of LorraineP.O.Box.21042EpinalFrance laboratory of Energetics and Thermal and Mass Transfers El Manar University of TunisTunisTunisia

wood plays a major role in the production of furniture and wooden ***,in this process,the massive use of adhesives and plural connectors remains a definite problem for health and the ***,wood welding is a breakthrough in this *** paper reviews the applications of wood welding in furniture and construction and then examines advances in improving the durability of welded wood against *** contribution also highlights the need to join African tropical woods using the rotational friction welding *** to our results,these woods present interesting chemical singularities,which could provide solutions to the water vulnerability of the welded ***,the use of such a joining method would first free the Cameroonian furniture industry from the chemical industry,secondly position it at the forefront of new eco-design trends and thirdly make it competitive with other countries in the Central African *** works enrich the long and rich bibliography on the technique of wood welding,which has long been conspicuous by its absence of tropical woods.

关键词： wood welding tropical woods water vulnerability chemical singularities natural durability

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