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Production of high fructose syrup from Asparagus inulin using immobilized exoinulinase from Kluyveromyces marxianus YS-1

Abstract

Extracellular exoinulinase from Kluyveromyces marxianus YS-1, which hydrolyzes inulin into fructose, was immobilized on Duolite A568 after partial purification by ethanol precipitation and gel exclusion chromatography on Sephadex G-100. Optimum temperature of immobilized enzyme was 55 °C, which was 5 °C higher than the free enzyme and optimal pH was 5.5. Immobilized biocatalyst retained more than 90% of its original activity after incubation at 60 °C for 3 h, whereas in free form its activity was reduced to 10% under same conditions, showing a significant improvement in the thermal stability of the biocatalyst after immobilization. Apparent K m values for inulin, raffinose and sucrose were found to be 3.75, 28.5 and 30.7 mM, respectively. Activation energy (E a) of the immobilized biocatalyst was found to be 46.8 kJ/mol. Metal ions like Co2+ and Mn2+ enhanced the activity, whereas Hg2+ and Ag2+ were found to be potent inhibitors even at lower concentrations of 1 mM. Immobilized biocatalyst was effectively used in batch preparation of high fructose syrup from Asparagus racemosus raw inulin and pure inulin, which yielded 39.2 and 40.2 g/L of fructose in 4 h; it was 85.5 and 92.6% of total reducing sugars produced, respectively.

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Acknowledgment

Authors are thankful to the Department of Biotechnology, Punjabi University, Patiala for providing necessary laboratory facilities.

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Correspondence to Ram Sarup Singh.

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Singh, R.S., Dhaliwal, R. & Puri, M. Production of high fructose syrup from Asparagus inulin using immobilized exoinulinase from Kluyveromyces marxianus YS-1. J Ind Microbiol Biotechnol 34, 649–655 (2007). https://doi.org/10.1007/s10295-007-0237-1

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  • DOI: https://doi.org/10.1007/s10295-007-0237-1

Keywords

  • Kluyveromyces marxianus
  • Asparagus racemosus
  • Inulinase
  • Immobilization
  • High fructose syrup