# Robustness of the Cupriavidus necator-Catalyzed Production of α-Humulene

## TL;DR

This paper shows that the production of α-humulene using Cupriavidus necator is highly robust and can withstand process disturbances.

## Contribution

The study is the first to quantify the robustness of α-humulene production using C. necator pKR-hum.

## Key findings

- 79% of the maximum α-humulene level was produced even with simulated process disturbances.
- C. necator pKR-hum shows consistent biomass formation and product resilience.
- The process improvements enhance the robustness of both product and biomass formation.

## Abstract

The increasing global demand for natural substances such as the sesquiterpene α-humulene makes optimizing microbial production essential. A production process using the versatile host Cupriavidus necator has been recently improved by adjusting the minimal media and process parameters. Understanding microbial and process robustness is key to ensuring consistent performance under different conditions. This study is the first to investigate and quantify the robustness of microbial α-humulene production and biomass formation using C. necator pKR-hum. Established process improvements and the impact of common or individual precultures were analyzed and quantified for their effect on the robustness of product and biomass formation. We report a robust α-humulene production process with even more consistent biomass formation using C. necator pKR-hum. Even with a simulated process disturbance, 79% of the maximum α-humulene level was still produced. Overall, our results show that the α-humulene production process using C. necator pKR-hum is highly robust, demonstrating its resilience to process disturbances and suitability for further industrial applications.