Characterization of hemicellulases from thermophilic fungi |
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Authors: | P Maijala N Kango N Szijarto L Viikari |
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Institution: | (1) Department of Food and Environmental Sciences, University of Helsinki, PO Box 27 (Latokartanonkaari 11), 00014 Helsinki, Finland;(2) Department of Applied Microbiology and Biotechnology, Dr. Hari Singh Gour Vishwavidyalaya, Sagar, 470003, Madhya Pradesh, India |
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Abstract: | The thermophilic fungi Thermomyces lanuginosus, Malbranchea cinnamomea, Myceliophthora fergusii and the thermotolerant Aspergillus terreus were cultivated on various carbon sources, and hemicellulolytic and cellulolytic enzyme profiles were evaluated. All fungi
could grow on locust bean galactomannan (LBG), Solka floc, wheat bran and pectin, except T. lanuginosus, which failed to utilize LBG for growth. Different levels of cellulase and hemicellulase activities were produced by these
fungal strains. Depending on the carbon source, variable ratios of thermostable hydrolytic enzymes were obtained, which may
be useful in various applications. All strains were found to secrete xylanolytic and mannanolytic enzymes. Generally, LBG
was the most efficient carbon source to induce mannanase activities, although T. lanuginosus was able to produce mannanase only on wheat bran as a carbon source. Xylanolytic activities were usually highest on wheat
bran medium, but in contrast to other investigated fungi, xylanase production by M. fergusii was enhanced on pectin medium. Preliminary thermostability screening indicated that among the investigated species, thermotolerant
glycosidases can be found. Some of the accessory activities, including the α-arabinosidase activity, were surprisingly high.
The capability of the produced enzymes to improve the hydrolysis of lignocellulosic pretreated substrate was evaluated and
revealed potential for these enzymes. |
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