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Long-chain alcohol production by yeasts.
M J White1, L F Hodgson, A H Rose
1Carnegie Mellon University, Pittsburgh.
Yeast (Chichester, England)
|April 1, 1989
Summary
Yeast synthesize long-chain alcohols, primarily C16 saturated fatty alcohols, with levels influenced by growth conditions. Candida albicans showed the highest production, particularly under anaerobic, high-glucose conditions.
Area of Science:
- Microbiology
- Biochemistry
- Yeast Metabolism
Background:
- Long-chain alcohols are important cellular components in various organisms.
- Yeast are known to produce a range of metabolites, including alcohols.
- Understanding yeast-derived alcohol synthesis can have biotechnological implications.
Purpose of the Study:
- To analyze the presence and characteristics of long-chain alcohols in diverse yeast strains.
- To investigate the influence of environmental factors on yeast long-chain alcohol synthesis.
- To identify specific yeast species and conditions favoring high alcohol production.
Main Methods:
- Analysis of fourteen yeast strains from six genera.
- Quantification of long-chain alcohols (C14, C16, C18) using chromatographic techniques.
- Cultivation under varying conditions: aerobic vs. anaerobic, glucose concentrations (1.0-30.0%), galactose, glycerol, odd-chain fatty acids, and nitrogen limitation.
Main Results:
- Candida albicans exhibited the highest long-chain alcohol levels, predominantly saturated C16 primary alcohols.
- Alcohol synthesis in C. albicans occurred post-exponential growth phase.
- Aerobic growth yielded lower alcohol content compared to anaerobic growth.
- Increased glucose concentration (up to 30.0%) enhanced alcohol production.
- Galactose reduced, while glycerol abolished, alcohol synthesis in aerobic cultures.
- Odd-chain fatty acids induced odd-chain alcohol synthesis anaerobically.
- Nitrogen limitation and glucose excess promoted alcohol synthesis in aerobically grown Candida maltosa.
Conclusions:
- Yeast long-chain alcohol production is strain-dependent and significantly modulated by nutrient availability and oxygen levels.
- Specific conditions, such as anaerobic fermentation with high glucose and nitrogen limitation, optimize alcohol yields in certain yeast species.
- The findings provide insights into yeast metabolic regulation and potential for targeted production of valuable long-chain alcohols.