Authors: Bhavadee Iamtasna Taviwan Piyasombatkul Seeroong Prichanont Chirakarn Muangnapoh
Publish Date: 2010/02/04
Volume: 56, Issue: 3, Pages: 184-188
Abstract
Teak veneer was treated with a commercial hemicellulase from Thermomyces lanuginosus in sequence with hydrogen peroxide or a hydrogen peroxidelaccase mixture to improve the veneer surface color and at the same time to reduce the necessary amount of hydrogen peroxide The removal of a small portion of hemicellulose from the teak veneer surface could be carried out after treatment with the hemicellulase preparation as 005 xylanase unit/ml for 30 min The veneer samples immediately after the hemicellulase treatment were subjected to the designated concentration of hydrogen peroxide or hydrogen peroxidelaccase mixture at 60°C at pH 65 for 4 h The changes in veneer color were measured by using imaging technology as percentage change in gray scale A treatment combination of hemicellulase containing xylanase hydrogen peroxide and laccase yielded a color improvement close to that achieved using 20 hydrogen peroxide The results showed that hemicellulase pretreatment could improve the bleachability of teak veneer surfaces treated with hydrogen peroxide or hydrogen peroxidelaccase mixture
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