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- W2077709785 abstract "Seven fungal strains were screened for their ability to produce cellulase-free xylanases that could be used in pretreatment of sulphite pulp prior to bleaching. The potential xylanase producers were subjected to shake flask fermentations using four different carbon sources: wheat bran, corn cobs, oat spelts xylan and bleach plant effluent. When grown on corn cobs, Aspergillus foetidus (ATCC 14916) produced significant levels of xylanase (547.4 U/ml), accompanied however by 6.6 U/ml of cellulase activity. Two other strains, Aspergillus oryzae (NRRL 1808) and Gliocladium viride (CBS 658.70), produced high yields of cellulase-free xylanase on oat spelts xylan. The crude enzymes of these two isolates were characterized with respect to pH and temperature optima and stability in order to standardize the optimum conditions for their use on pulp. Although the two xylanases differed in their abilities to remove reducing sugars from pulp, their biobleaching abilities, when assessed in hydrogen peroxide delignification of pulp, were very similar: both of them increased brightness by 1.4 points and removed 7% of hemicellulose from pulp." @default.
- W2077709785 created "2016-06-24" @default.
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- W2077709785 date "1999-07-01" @default.
- W2077709785 modified "2023-10-17" @default.
- W2077709785 title "Production, partial characterization and use of fungal cellulase-free xylanases in pulp bleaching" @default.
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- W2077709785 doi "https://doi.org/10.1016/s0032-9592(98)00117-4" @default.
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