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Glycolic acid production using ethylene glycol-oxidizing microorganisms
M Kataoka1, M Sasaki, A R Hidalgo
1Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Japan. kataoka@kais.kyoto-u.ac.jp
Bioscience, Biotechnology, and Biochemistry
|January 5, 2002
Summary
Researchers identified yeasts and bacteria capable of oxidizing ethylene glycol to glycolic acid. Optimized conditions yielded over 100 g/l of glycolic acid, demonstrating efficient bioproduction.
Area of Science:
- Microbiology
- Biotechnology
- Biochemical Engineering
Background:
- Ethylene glycol oxidation to glycolic acid is a key biotransformation.
- Microbial production of glycolic acid offers a sustainable alternative to chemical synthesis.
Purpose of the Study:
- To screen and identify microorganisms with high glycolic acid production capabilities.
- To optimize fermentation conditions for enhanced glycolic acid yields.
Main Methods:
- Screening of stock cultures and soil isolates for ethylene glycol oxidizing activity.
- Isolation of promising strains, including Rhodotorula sp. 3Pr-126.
- Optimization of culture parameters for Pichia naganishii AKU 4267 and Rhodotorula sp. 3Pr-126.
Main Results:
- Pichia naganishii AKU 4267 produced 35.3 g/l glycolic acid from 10% ethylene glycol.
- Rhodotorula sp. 3Pr-126 yielded 25.1 g/l glycolic acid from 10% ethylene glycol and showed better performance at 20% substrate concentration.
- Optimized conditions led to 105 g/l and 110 g/l glycolic acid production by P. naganishii AKU 4267 and Rhodotorula sp. 3Pr-126, respectively.
Conclusions:
- Several yeast and acetic acid bacteria strains exhibit significant glycolic acid production potential.
- Rhodotorula sp. and Pichia naganishii are promising candidates for industrial-scale glycolic acid bioproduction.
- Optimized bioprocesses achieved high yields and conversion efficiencies for glycolic acid synthesis.