1. Hydrophobic properties conferred to Kraft pulp by a laccase-catalysed treatment with lauryl gallate
- Author
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Céline Reynaud, Michel Petit-Conil, Sandra Tapin-Lingua, Graziano Elegir, Stéphanie Baumberger, Intechfibers, FCBA, New Mat Div, Domaine Univ, Paper Div, Innovhub ssi, Intechfibers, Ctr Tech Papier, Institut Jean-Pierre Bourgin (IJPB), Institut National de la Recherche Agronomique (INRA)-AgroParisTech, ENCELPA, ANRT, and Institut Technologique Forêt Cellulose Bois-construction Ameublement (FCBA)
- Subjects
Paper ,[SDV.SA]Life Sciences [q-bio]/Agricultural sciences ,0106 biological sciences ,Absorption of water ,Hydrophobicity ,MODELS ,Bioengineering ,Kappa number ,01 natural sciences ,Applied Microbiology and Biotechnology ,Acetone ,GALLIC ACID ,chemistry.chemical_compound ,Adsorption ,010608 biotechnology ,Organic chemistry ,Gallic acid ,Laccase ,010405 organic chemistry ,Green Chemistry Technology ,General Medicine ,Wood ,0104 chemical sciences ,chemistry ,Kraft process ,Papermaking ,Lauryl gallate ,Dodecanol ,Hydrophobic and Hydrophilic Interactions ,Biotechnology - Abstract
Hydrophobic properties were conferred to a high-lignin-content Kraft pulp by a laccase-catalysed treatment in the presence of lauryl gallate (LG). The treatment resulted in a two-fold increase in contact angle and conferred water absorption resistance to the pulp. Kappa number was increased, indicating that some phenolic compounds were incorporated in the pulp. A control treatment with LG alone did not affect water absorption, demonstrating that laccase was essential to attain these new properties. The loss of hydrophobicity after an acetone Soxhlet extraction highlighted that adsorbed acetone-soluble compounds played a key role in the properties. GC-FID and HPSEC-UV analysis of the acetone extract indicated the formation of dodecanol and different phenolic oligomers. SEM images showed the treatment-induced changes in the fibre network. Additional experiments with various reaction times and reactant concentrations highlighted the role of LG oxidation products in the introduction of absorption resistance. (C) 2013 Elsevier B.V. All rights reserved.
- Published
- 2013
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