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The aim of this work was to develop an innovative method for the internal sizing of paper by use of laccase
and hydrophobic compounds. Nine different products containing hydrophobic moieties were tested
in combination with laccase derived from Trametes villosa on Eucalyptus globulus kraft pulp in order to
assess their internal sizing capability. The strongest internal sizing effect was obtained with lauryl gallate
(LG). Heat treatment of the handsheets was found to increase the resistance to water absorption of internally
sized samples significantly. Tests were conducted under variable operating conditions, including
enzyme and reactant doses and treatment time. In addition to altering the water absorption rate, internal
sizing with the laccase–LG treatments was found to affect the mechanical and optical properties of the
handsheets. As shown in this work, treatments based on laccase and a hydrophobic compound (particularly
lauryl gallate), can provide a new, effective biotechnological method for the internal sizing of paper.
CitationGarcia-Ubasart, J. [et al.]. Enzymatic treatments of pulp using laccase and hydrophobic compounds. "Bioresource technology", Febrer 2011, vol. 102, núm. 3, p. 2799-2803.
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