High-throughput screening assay for biological hydrogen production

Area of Science:

• Biotechnology
• Microbiology
• Biochemistry

Background:

• Biological hydrogen (H2) production is a key area for renewable energy research.
• Accurate and efficient screening methods are crucial for identifying novel H2-producing organisms.
• Current methods may lack the throughput or sensitivity required for large-scale bioprospecting.

Purpose of the Study:

• To develop and validate a novel, high-throughput screening assay for assessing biological hydrogen production.
• To adapt the assay for use in a standard microtiter plate format for compatibility with existing laboratory workflows.
• To evaluate the assay's sensitivity, reproducibility, and robustness against common biological interfering substances.

Main Methods:

• A 96-well microtiter plate assay was designed with separate compartments for H2-producing cyanobacteria and a detection system.
• Hydrogen gas produced by cells diffuses through a membrane into an upper plate containing a color indicator and catalyst.
• Color change in the upper plate is quantified using a microplate reader.

Main Results:

• The assay demonstrated reproducibility and semi-quantitative measurement of hydrogen production.
• Sensitivity was established down to at least 20 nanomoles of H2.
• The assay showed minimal interference from oxygen, carbon dioxide, and volatile fatty acids at relevant biological concentrations.

Conclusions:

• The developed assay is a valuable tool for high-throughput screening of biological hydrogen production.
• Its sensitivity, reproducibility, and compatibility with standard equipment facilitate bioprospecting efforts.
• This method supports the advancement of renewable hydrogen energy research through efficient strain identification and characterization.