Development of an advanced acetaldehyde detection solution based on yeast and bacterial surface display technology

Area of Science:

• Biotechnology
• Biosensor Development
• Environmental Monitoring

Background:

• Acetaldehyde is a prevalent carcinogen in beverages and the environment.
• Efficient and convenient detection methods for acetaldehyde are crucial.
• Current detection methods may lack sensitivity or convenience.

Purpose of the Study:

• To develop a sensitive, convenient, and efficient whole-cell optical biosensor for acetaldehyde detection.
• To engineer Saccharomyces cerevisiae and E. coli for surface display of acetaldehyde dehydrogenase (AldH).
• To optimize and compare the performance of yeast and bacterial biosensor platforms.

Main Methods:

• Surface display of acetaldehyde dehydrogenase (AldH) on Saccharomyces cerevisiae using flocculin and on E. coli using ice nucleation protein (INP).
• Confirmation of surface display using laser scanning confocal microscopy.
• Optimization of reaction conditions (temperature, pH) and comparison of display systems.
• Application of the developed biosensors for acetaldehyde detection in wine and beverage samples.

Main Results:

• Successful construction and confirmation of AldH surface display on both yeast and E. coli.
• Determination of optimal reaction conditions and highest whole-cell activities for yeast (3.68 ± 0.07 U/mL/OD600) and E. coli (6.95 ± 0.04 U/mL/OD600).
• Demonstrated substrate specificity and accuracy in detecting acetaldehyde in real samples, with recovery rates from 94.4% to 110.1%.

Conclusions:

• Engineered yeast and E. coli strains displaying AldH function as effective whole-cell optical biosensors for acetaldehyde.
• The developed biosensor offers a sensitive, convenient, and efficient method for acetaldehyde detection in beverages, including red wine.
• This approach holds promise for monitoring acetaldehyde levels in food and environmental samples.