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Efficient pullulan production by Aureobasidium pullulans using cost-effective substrates.

Chaoyong He1, Zhen Zhang1, Youdan Zhang1

  • 1School of Biology and Basic Medical Sciences, Soochow University, Suzhou 215123, PR China.

International Journal of Biological Macromolecules
|July 17, 2021
PubMed
Summary
This summary is machine-generated.

This study optimized pullulan production using cost-effective substrates like corn steep liquor (CSL) and soybean meal hydrolysate (SMH). The optimized process achieved high yield and molecular weight, significantly reducing production costs for industrial applications.

Keywords:
Artificial neural networkCassava starchCorn steep liquorPullulanSoybean meal hydrolysate

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Area of Science:

  • Biotechnology
  • Industrial Microbiology
  • Biopolymer Production

Background:

  • Pullulan is a versatile polysaccharide with numerous industrial applications.
  • Optimizing pullulan production using cost-effective and sustainable substrates is crucial for its commercial viability.
  • Aureobasidium pullulan is a key microorganism for pullulan biosynthesis.

Purpose of the Study:

  • To evaluate the efficacy of cost-effective substrates (cassava starch, CSL, SMH) for pullulan production.
  • To optimize the fermentation medium using Response Surface Methodology (RSM) and Artificial Neural Network (ANN) models.
  • To investigate the physiological mechanisms and economic feasibility of using alternative substrates for pullulan synthesis.

Main Methods:

  • Cultivation of Aureobasidium pullulan CCTCC M 2012259 using various low-cost nutrient sources.
  • Medium optimization employing statistical methods: Response Surface Methodology (RSM) and Artificial Neural Network (ANN).
  • Analysis of pullulan yield, molecular weight, biomass, enzyme activities, and intracellular metabolites.

Main Results:

  • The ANN model demonstrated superior prediction accuracy for medium optimization compared to RSM.
  • Soybean meal hydrolysate (SMH) enhanced both biomass and pullulan titer, while corn steep liquor (CSL) promoted higher pullulan molecular weight.
  • Production costs for CSL and SMH substrates were reduced by 46.1% and 49.9%, respectively, compared to conventional glucose and yeast extract media.

Conclusions:

  • Cost-effective substrates like CSL and SMH significantly improve the economic competitiveness of pullulan production.
  • The optimized medium and substrate selection provide a viable strategy for high-yield, high-molecular-weight pullulan synthesis.
  • Understanding the physiological responses to different substrates offers insights for further enhancing pullulan biosynthesis.