Hydrolysis of Agricultural Residues and Kraft Pulps by Xylanolytic Enzymes from Alkaliphilic Bacillus sp. Strain BK

  • Kaewintajuk Kusuma (School of Bioresources and Technology, King Mongkut's University of Technology Thonburi) ;
  • Chon Gil-Hyong (Department of Infection Biology, College of Medicine, Wonkwang University) ;
  • Lee Jin-Sang (Department of Infection Biology, College of Medicine, Wonkwang University) ;
  • Kongkiattikajorn Jirasak (School of Bioresources and Technology, King Mongkut's University of Technology Thonburi) ;
  • Ratanakhanokchai Khanok (School of Bioresources and Technology, King Mongkut's University of Technology Thonburi) ;
  • Kyu Khin Lay (School of Bioresources and Technology, King Mongkut's University of Technology Thonburi) ;
  • Lee John-Hwa (College of Veterinary Medicine, Chonbuk National University) ;
  • Roh Min-Suk (Department of Applied Biochemistry, Konkuk University) ;
  • Choi Yun-Young (Department of Infection Biology, College of Medicine, Wonkwang University) ;
  • Park Hyun (Department of Infection Biology, College of Medicine, Wonkwang University) ;
  • Lee Yun-Sik (Department of Infection Biology, College of Medicine, Wonkwang University)
  • 발행 : 2006.08.01

초록

An alkaliphilic bacterium, Bacillus sp. strain BK, was found to produce extracellular cellulase-free xylanolytic enzymes with xylan-binding activity. Since the pellet-bound xylanase is eluted with 2% TEA from the pellet of the culture, they contain a xylan-binding region that is stronger than the xylan-binding xylanase of the extracellular enzyme. The xylanases had a different molecular weight and xylan-binding ability. The enzyme activity of xylanase in the extracellular fraction was 6 times higher than in the pellet-bound enzyme. Among the enzymes, xylanase had the highest enzyme activity. When Bacillus sp. strain BK was grown in pH 10.5 alkaline medium containing xylan as the sole carbon source, the bacterium produced xylanase, arabinofuranosidase, acetyl esterase, and $\beta$-xylosidase with specific activities of 1.23, 0.11, 0.06, and 0.04 unit per mg of protein, respectively. However, there was no cellulase activity detected in the crude enzyme preparation. The hydrolysis of agricultural residues and kraft pulps by the xylanolytic enzymes was examined at 50$^{\circ}C$ and pH 7.0. The rate of xylan hydrolysis in com hull was higher than those of sugarcane bagasse, rice straw, com cop, rice husk, and rice bran. In contrast, the rate of xylan hydrolysis in sugarcane pulp was 2.01 and 3.52 times higher than those of eucalyptus and pine pulp, respectively. In conclusion, this enzyme can be used to hydrolyze xylan in agricultural residues and kraft pulps to breach and regenerate paper from recycled environmental resources.

키워드

참고문헌

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