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[Optimization of yeast autolysis under solid-state fermentation conditions].

Xing Su1,2,3, Zheng Zhang1,2,3, Qiwei Zhang1,2,3

  • 1College of Veterinary, Inner Mongolia Agricultural University, Hohhot 010018, Inner Mongolia, China.

Sheng Wu Gong Cheng Xue Bao = Chinese Journal of Biotechnology
|April 20, 2019
PubMed
Summary

Optimizing yeast autolysis using solid-state fermentation enhances active substance release. The best conditions (55°C, 18h, 2mg/kg zinc) significantly boost soluble protein and amino acid content for improved yeast product quality.

Keywords:
process conditionssolid-state fermentationyeast autolysis

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Area of Science:

  • Biotechnology
  • Food Science
  • Microbiology

Background:

  • Yeast autolysis is crucial for releasing bioactive compounds.
  • Solid-state fermentation (SSF) offers advantages for yeast processing.
  • Improving yeast product quality requires optimizing autolysis parameters.

Purpose of the Study:

  • To optimize yeast autolysis conditions under solid-state fermentation.
  • To enhance the release of key active substances like soluble protein and amino acids.
  • To improve the overall quality of yeast-derived products.

Main Methods:

  • Solid-state fermentation (SSF) was employed for yeast autolysis.
  • An L₉(3³) orthogonal experimental design was used for optimization.
  • Key parameters optimized included temperature, time, and zinc ion concentration.
  • Analysis of free amino acid, soluble protein, α-amino nitrogen, and A₂₆₀/A₂₈₀ ratio.

Main Results:

  • Optimal conditions determined as 55°C, 18 hours, and 2 mg/kg zinc ion concentration.
  • Soluble protein content reached 9.31 mg/g.
  • Free amino acid content reached 14.36 mg/g.
  • α-amino nitrogen reached 10.16 μg/g with an A₂₆₀/A₂₈₀ ratio of 1.73.

Conclusions:

  • Optimized SSF yeast autolysis significantly increases soluble protein and free amino acid content.
  • The enhanced active substance release leads to a marked improvement in yeast product quality.
  • This study provides an optimized protocol for high-quality yeast autolysis production.