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Applied Biochemistry and Biotechnology

, Volume 172, Issue 1, pp 380–393 | Cite as

Response Surface Methodology Based Optimization of β-Glucosidase Production from Pichia pastoris

  • Jyoti Batra
  • Dhananjay Beri
  • Saroj MishraEmail author
Article

Abstract

The thermotolerant yeast Pichia etchellsii produces multiple cell bound β-glucosidases that can be used for synthesis of important alkyl- and aryl-glucosides. Present work focuses on enhancement of β-glucosidase I (BGLI) production in Pichia pastoris. In the first step, one-factor-at-a-time experimentation was used to investigate the effect of aeration, antifoam addition, casamino acid addition, medium pH, methanol concentration, and mixed feed components on BGLI production. Among these, initial medium pH, methanol concentration, and mixed feed in the induction phase were found to affect BGLI production. A 3.3-fold improvement in β-glucosidase expression was obtained at pH 7.5 as compared to pH 6.0 on induction with 1 % methanol. Addition of sorbitol, a non-repressing substrate, led to further enhancement in β-glucosidase production by 1.4-fold at pH 7.5. These factors were optimized with response surface methodology using Box–Behnken design. Empirical model obtained was used to define the optimum “operating space” for fermentation which was a pH of 7.5, methanol concentration of 1.29 %, and sorbitol concentration of 1.28 %. Interaction of pH and sorbitol had maximum effect leading to the production of 4,400 IU/L. The conditions were validated in a 3-L bioreactor with accumulation of 88 g/L biomass and 2,560 IU/L β-glucosidase activity.

Keywords

β-glucosidase I Pichia pastoris Response surface methodology Box–Behnken Design Pichia etchellsii 

Abbreviations

BGLI

β-glucosidase

pNPG

p-Nitrophenyl glucopyranoside

OFAT

One-factor-at-a-time

RSM

Response surface methodology

Notes

Acknowledgments

Financial assistance from the Department of Science and Technology, Government of India, New Delhi is gratefully acknowledged. Senior research fellowship to Miss Jyoti Batra from the Council of Scientific and Industrial Research, New Delhi and scholarship to Mr. Dhananjay Beri provided by the Ministry of Human Resource and Development are gratefully acknowledged. We also thank Mr. Ashwani Gautam and Mr. Anshul Sharma for assisting in running the fermentor.

Supplementary material

12010_2013_519_MOESM1_ESM.docx (66 kb)
ESM 1 (DOCX 66 kb)

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Department of Biochemical Engineering and BiotechnologyIndian Institute of Technology DelhiNew DelhiIndia

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