Purification and Characterization of an Endoinulinase from Xanthomonas campestris pv. phaseoli KM 24 Mutant 

Kameshnee Naidoo§, Ajit Kumar§, Vikas Sharma, Kugen Permaul and Suren Singh*

Department of Biotechnology and Food Technology, Faculty of Applied Sciences, Durban University of Technology,
P.O. Box 1339, Durban 4001, Republic of South Africa

Article history:
Received September 18, 2014
Accepted February 23, 2015

Key words
Xanthomonas campestris pv. phaseoli KM 24 mutant, inulinases, endoinulinases, exoinulinases, fructooligosaccharides, inulin

An extracellular endoinulinase from Xanthomonas campestris pv. phaseoli KM 24 mutant was purified to homogeneity by gel filtration chromatography and showed a specific activity of 119 U/mg. The optimum pH and temperature of the purified enzyme were found to be 6.0 and 50 °C, respectively. The enzyme was stable up to 60 °C, retaining 60 % of residual activity for 30 min, but inactivated rapidly above 60 °C. The enzyme was found to be stable at pH=6–9 when it retained 100 % of its residual activity. The Lineweaver-Burk plot showed that the apparent Km and vmax values of the inulinase when using inulin as a substrate were 1.15 mg/mL and 0.15 μM/min, respectively, whereas the kcat value was found to be 0.145 min–1. The calculated catalytic efficiency of the enzyme was found to be 0.126 (mg·min)/mL. The purified inulinase can be used in the production of high fructose syrups.




*Corresponding author:          
   +27 31 373 5321
   +27 31 308 5351

§Both authors contributed equally to this work

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