Digital penicillin production

April 10, 2018, Vienna University of Technology
Bio-reactor at TU Wien. Credit: Vienna University of Technology

TU Wien and Sandoz GmbH have successfully implemented a real-time computer simulation of the complex growth behaviour of penicillin producing organisms. This simulation now helps to keep the production process under control.

For thousands of years, micro-organisms have been used to facilitate chemical reactions – in beer brewing, for example. However, biochemical processes are incredibly complex, with a multitude of reactions taking place simultaneously and influencing one another. There are countless parameters that play a role, not all of which can be directly measured.

Despite the difficulties involved, researchers at TU Wien are now working on examining these processes in detail. Now, in cooperation with pharmaceutical manufacturer Sandoz, TU Wien has succeeded in analysing and comprehensively replicating a penicillin using a computer model. This process has even enabled researchers to determine parameters that cannot be measured directly. Sandoz is now making use of these findings to keep a full overview of the processes in the bioreactor at all times, ensuring optimum quality.

Black box replaced by in-depth knowledge

Many are easy to understand: if hydrogen is burned with oxygen, water is produced – in a clearly predictable manner and in a volume that can be precisely calculated beforehand. But how can you calculate how quickly a fungus will grow and proliferate under the constantly changing conditions in a bioreactor?

"For a long time, processes like this were seen as a 'black box' that cannot be understood and that can only be effectively exploited with a lot of experience," says Prof. Christoph Herwig, who leads the research group for bioprocess technology at TU Wien's Institute of Chemical, Environmental and Bioscience Engineering. "Our approach is somewhat different: we want to analyse the chemical processes in a bioreactor in detail and determine the equations that describe these processes." The aim is to produce a that accurately replicates these processes within the bioreactor.

"Many parameters that are vital to the process simply cannot be directly measured, such as the growth rate of the micro-organisms," explains Julian Kager, who is working with Sandoz GmbH as part of his dissertation. "This is precisely why a comprehensive mathematical model is so useful: we use accessible data from the production process in real time, such as the concentration of various substances in the , and use our computer model to calculate the most probable state of the process." The parameters that can't be measured can therefore be calculated.

The model information can be used to optimise the nutrient supply to the cultivated cells while the process is ongoing.

The system of equations used to mathematically describe the bioprocess is as complex and multifaceted as the process itself. "The system of equations describes a non-linear dynamic system. Even the smallest variations in the starting conditions can have a huge impact," explains Kager. "This means it's not really possible to simply work out a solution by hand; instead, relatively elaborate computer simulations are required to obtain the needed results."

The process and algorithms developed at TU Wien are now being used by Sandoz GmbH for its penicillin production . "We are very pleased that our basic research has been adopted for use in industry so quickly and that our approach of biochemical modelling is now being used to facilitate the automated control of pharmaceutical production processes," says Julian Kager.

Explore further: ISBM releases the updated version of Immune Response Template

More information: Julian Kager et al. State estimation for a penicillin fed-batch process combining particle filtering methods with online and time delayed offline measurements, Chemical Engineering Science (2017). DOI: 10.1016/j.ces.2017.11.049

Related Stories

CO2-neutral hydrogen from biomass

July 7, 2017

Without fossil fuels, there can be no blast furnace process – but hydrogen could play a more important role in the future. An environmentally friendly process is being developed at TU Wien by which biomass can be used to ...

New model gives better control of self-assembly processes

October 10, 2013

Researchers at ICMS (Institute for Complex Molecular Systems, Eindhoven University of Technology) have developed a new model that allows better control of self-assembly, the process through which molecules aggregate by themselves ...

Electrical current provides a look inside the lungs

September 7, 2017

A new imaging technique, Electrical Impedance Tomography (EIT), will soon be used to monitor important bodily functions. A collaborative project between TU Wien, the Medical University of Vienna and the University of Veterinary ...

Recommended for you

Coffee-based colloids for direct solar absorption

March 22, 2019

Solar energy is one of the most promising resources to help reduce fossil fuel consumption and mitigate greenhouse gas emissions to power a sustainable future. Devices presently in use to convert solar energy into thermal ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.