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Novel optimization strategy for tannase production through a modified solid-state fermentation system.
Changzheng Wu1,2,3,4, Feng Zhang1,2,4, Lijun Li1,2,3
11College of Food and Biological Engineering, Jimei University, Xiamen, 361021 China.
Biotechnology for Biofuels
|April 6, 2018
Summary
A modified solid-state fermentation (SSF) system accurately measures microbial biomass and enzyme activity, overcoming traditional limitations. Optimized nutrient sources significantly enhanced tannase production in tea stalk SSF.
Area of Science:
- Biotechnology
- Microbial Fermentation
- Enzyme Production
Background:
- Traditional solid-state fermentation (SSF) hinders accurate microbial biomass measurement due to insoluble substrates.
- Enzyme activity is often the sole optimization index, neglecting the link between microbial growth and enzyme synthesis.
- A modified SSF system using an aqueous extract of tea stalk and polyurethane sponge was developed to address these limitations.
Purpose of the Study:
- To establish a modified SSF system enabling accurate measurement of microbial biomass, enzyme activity, and productivity.
- To investigate the relationship between microbial biomass and enzyme activity in tannase production.
- To optimize nutrient sources for enhanced tannase production using response surface methodology.
Main Methods:
- Extraction of soluble nutrients from tea stalk.
- Development of a modified SSF system using polyurethane sponge.
- Single-factor experiments to identify optimal carbon and nitrogen sources (glucose, yeast extract, tannin, ammonium sulfate).
- Response surface methodology for optimizing nutrient concentrations.
- Application of optimized parameters to traditional tea stalk SSF.
Main Results:
- Optimized nutrient sources (7.49% tannin, 8.11% glucose, 9.26% (NH4)2SO4, 2.25% yeast extract) significantly increased tannase activity to 19.22 U/gds.
- The modified SSF system demonstrated a 6.36-fold increase in tannase activity compared to initial conditions.
- Applying optimized parameters to traditional tea stalk SSF resulted in a 2.9-fold increase in tannase activity (245 U/gds).
Conclusions:
- The modified SSF system effectively addresses limitations of traditional SSF, allowing accurate assessment of microbial growth and enzyme production.
- Enzymatic activity and microbial biomass are closely correlated, influenced by nutrient source composition.
- Optimized nutrient combinations enhance both cell growth and tannase accumulation, significantly improving bioproduction via SSF.
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