Sulfuric acid bleaching of kraft pulp III: reactivity of kraft pulping-resistant structures under acidic conditions
✍ Scribed by Tsutomu Ikeda; Yoichi Tomimura; Kengo Magara; Mitsuro Ishihara; Shuji Hosoya
- Publisher
- Springer
- Year
- 1999
- Tongue
- English
- Weight
- 642 KB
- Volume
- 45
- Category
- Article
- ISSN
- 1435-0211
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Pulp brightness gains obtained by fungal biobleaching are often decreased by dark MnOZ deposits which are formed by the biologically-mediated oxidation of Mn(I1). Oxalic acid extraction of OZdelignified kraft pulps bleached by several white-rot fungi was found to increase pulp brightness by up to 9.
## Abstract A study relating to the biological detoxification of resin acids is described. Abietic acid was transformed into a number of non‐toxic hydroxylated derivatives by __Mortierella isabellina.__ The biotransformation products have been identified and shown to be less toxic than abietic acid
Pine-wood chips were treated with sodium hydroxide at a rather low temperature (40°C) and the products obtained in solution were analysed by capillary gasliquid chromatography-mass spectrometry. In addition to fatty and resin acids, which were the main products, 22 hydroxy monocarboxylic, 18 dicarbo