Biotechnology Bulletin ›› 2016, Vol. 32 ›› Issue (9): 189-196.doi: 10.13560/j.cnki.biotech.bull.1985.2016.09.025

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Separation,Purification,and Enzymatic Properties of Thermo-tolerant β-glucosidase from Tridchoderma viride

PENG Li-sha, ZHANG Yong-xiang, YAN Qing, WANG Xiang, LI Jun   

  1. 1. College of Food Science and Technology,Hebei Normal University of Science & Technology,Qinhuangdao 066600; 2. Fruit Processing Engineering Technology Research Center of Hebei Province,Qinhuangdao 066600
  • Received:2016-01-26 Online:2016-09-25 Published:2016-10-10

Abstract: This study aims to separate and purify the β-glucosidase of Tridchoderma viride and to investigate its enzyme characterization. T. viride GIM3.139 was fermented in shaking flask,and the enzymatic properties of the purified β-glucosidase by centrifugal ultrafiltration and Sephadex G-200 gel chromatography were studied. Further,the separated and purified constituents were tested by PAGE(polyacrylamide gel electrophoresis),and it reached the electrophoretic-purity. The results showed that the optimal reaction temperature was 80℃ and it was still in a high enzymatic activity for a long time in the range of 75-95℃;also the β-glucosidase presented a strong stability under acidic and alkaline conditions and its optimal pH value was 6.5. Some metal ions including Fe3+,Mg2+,and K+ inhibited the activity of β-glucosidase,among which Fe3+ did it the most significantly. However,Fe2+ and Mn2+ activated the enzyme,and Mn2+ did it the most significantly. Organic solvents such as methanol and acetone increased the enzymatic activity,and methanol did it the most significantly. However,the ethyl acetate showed obvious inhibition effect. In conclusion,electrophoretic-purity β-glucosidase was separated and purified from T. viride and the enzymatic properties were characterized as well.

Key words: Tridchoderma viride, β-glucosidase, separation and purification, enzymatic properties