Bioconversion yields must account for all carbon: hidden biases from complex media

Area of Science:

• Biotechnology
• Biochemical Engineering
• Metabolic Engineering

Background:

• Accurate yield ratio determination is crucial for assessing bioprocess efficiency.
• Complex media formulations often contain unquantified carbon sources, complicating yield calculations.
• Previous methods may neglect significant carbon contributions, leading to biased efficiency metrics.

Purpose of the Study:

• To highlight the biases introduced by neglecting carbon-containing molecules in complex media.
• To recommend a standardized approach for calculating yield ratios in bioprocesses.
• To emphasize the importance of reporting complete media formulations.

Main Methods:

• Analysis of carbon contributions from various components in complex media formulations.
• Comparison of yield ratio calculations with and without accounting for all carbon sources.
• Literature review on current practices in bioprocess yield reporting.

Main Results:

• Unquantified carbon in media significantly biases calculated yield ratios.
• Neglecting common media components like yeast extract or peptones leads to overestimation of conversion efficiency.
• Accurate yield calculation necessitates the explicit quantification of all carbon inputs.

Conclusions:

• Yield ratios must be reported by accounting for all carbon sources in the media.
• Complete and transparent reporting of media formulations is essential for reproducibility and accurate bioprocess assessment.
• Implementing these recommendations will improve the reliability of bioprocess conversion efficiency data.