Biological bleaching of Magabuyo (Celtis luzonica Warb.) and abaca (Musa textilis Nee) using Trametes versicolor 52J
2000
Giron, M.Y. (Forest Products Research and Development Inst., College, Laguna (Philippines)) Reid, I.A. | Ricard, M.
The delignification and bleaching ability of Trametes versicolor 52J was tested on magabuyo and abaca kraft pulps. Five-day-old starter cultures of the fungus were inoculated on 2% consistency pulp in a modified liquid medium. They were incubated at 26 deg C and shaken at 200 rpm for 6 days. Brightness, opacity and other physical properties of the bleached pulps were evaluated and compared against those of a hardwood kraft pulp (HWKP 1739-07). Results showed that T versicolor 52J caused a marked increase in brightness of the bleached pulps, i.e., 62.28% and 32% for magabuyo and abaca pulps, respectively. Burst index, breaking length and fold number of the bleached pulps varied, but their Kappa number decreased (52.29% in magabuyo and 44.81% in abaca). It appears that T. versicolor 52J can efficiently bleach magabuyo and abaca kraft pulps as it does HWKP. The amount of laccase and manganese peroxidase produced and the accumulation of methanol in the substrate indicated that the fungus was active in the bleaching process
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