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Optimization of Levan Production by Cold-Active Bacillus licheniformis ANT 179 and Fructooligosaccharide Synthesis by Its Levansucrase

Applied Biochemistry and Biotechnology volume 181, pages 986–1006 (2017)Cite this article

Abstract

Fructooligosaccharides (FOS) and levan attract much attention due to a wide range of applications in food technology and pharmaceutical and cosmetic industry. Bacillus licheniformis ANT 179, isolated from Antarctica soil, produced levansucrase and levan in a medium containing sucrose as carbon substrate. In this study, characterization of levansucrase and production of short-chain FOS and levan were investigated. Temperature and pH optimum of the enzyme were found to be 60 °C and pH 6.0, respectively. The optimization of fermentation conditions for levan production using sugarcane juice by response surface methodology (RSM) was carried out. Central composite rotatable design was used to study the main and the interactive effects of medium components: sugarcane juice and casein peptone concentration on levan production by the bacterium. The optimized medium with sugarcane juice at 20 % (v/v) and casein peptone at 2 % (w/v) was found to be optimal at an initial pH of 7.0 and incubation temperature of 35 °C for 48 h. Under these conditions, the maximum levan concentration was 50.25 g/L on wet weight basis and 16.35 g/L on dry weight basis. The produced inulin type FOS (kestose and neokestose) and levan were characterized by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR) analysis. The study revealed that the levansucrase could form FOS from sucrose. The locally available low-cost substrate such as sugarcane juice in the form of a renewable substrate is proposed to be suitable even for scale-up production of enzyme and FOS for industrial applications. The levan and FOS synthesized by the bacterium are suitable for food applications and biomedical uses as the bacterium has GRAS status and devoid of endotoxin as compared to other Gram-negative bacteria.

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Acknowledgments

We thank the Chairperson, Sophisticated Instrument Facility, Indian Institute of Science, Bangalore, India for providing NMR facilities.

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Affiliations

  1. Food Biotechnology Division, Defence Food Research Laboratory, Defence Research and Development Organization, Mysore, Karnataka, 570011, India

    Janifer Raj Xavier & Karna Venkata Ramana

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  1. Janifer Raj Xavier
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  2. Karna Venkata Ramana
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Correspondence to Janifer Raj Xavier.

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Xavier, J.R., Ramana, K.V. Optimization of Levan Production by Cold-Active Bacillus licheniformis ANT 179 and Fructooligosaccharide Synthesis by Its Levansucrase. Appl Biochem Biotechnol 181, 986–1006 (2017). https://doi.org/10.1007/s12010-016-2264-8

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  • DOI: https://doi.org/10.1007/s12010-016-2264-8

Keywords

  • Bacillus licheniformis
  • Levansucrase
  • Transfructosylation
  • Fructooligosaccharides
  • Levan
  • Biopolymers