Bioconversion and Protective Cultures

We use microorganisms in a targeted way to optimise the quality and safety of food products – for natural and environmentally sustainable food production.

In our group, we work on applied research projects that involve the use of microorganisms to optimise the quality and safety of plant-based and animal-based foods. This involves spontaneous fermentations, the development and use of starter and protective cultures and the maintenance of a robust microbiome for biopreservation.

Our activities underline the great potential of microbial processes – both for the production of natural and ecologically sustainable food and for the sustainable valorisation of food industry side streams. We are also researching the use of specific protective cultures to extend shelf life and reduce food waste along the entire value chain – from agricultural production to the finished food product (“from field to fork”).

Our projects are carried out in collaboration with various research partners, including Agroscope, businesses and start-ups, to develop and implement innovative solutions.

Expertise and infrastructure

Fermentation and process development

  • Developing and optimising the microbial fermentation processes for plant-based and animal-based foods
  • Food-grade fermentations for producing fermented and sensorially acceptable foods
  • Monitoring microbial fermentation processes and analysing fermentation kinetics (e.g. lactic acid bacteria)

Screening and characterising functional microorganisms

  • Screening and selecting functional microorganisms, in particular starter and protective cultures
  • Investigating the antimicrobial properties of microorganisms (e.g. inhibition of mycelial growth or spore germination in moulds)
  • Classical microbiological analyses for detecting various microorganism groups (S1 and S2 laboratories)
  • Identification using molecular biological methods (e.g. qPCR)
  • MALDI-TOF mass spectrometry (in collaboration with Agroscope)
  • Characterising the substrate utilisation of lactic acid bacteria (in collaboration with Agroscope)
  • Clarifying QPS status (e.g. antibiotic resistance, virulence factors or the formation of biogenic amines)

Bioprotection and extending shelf life

  • Developing microbial strategies for the natural extension of the shelf life of food
  • Using specific protective cultures to control spoilage and mould organisms
  • Strategies for reducing food waste along the food value chain

Analytics and product characterisation

  • HPLC analyses (UV/RID) for quantifying sugars, organic acids and vitamins

  • Analysing the chemical composition (proteins, fats, carbohydrates, micronutrients)
  • Determining the structural properties of food (e.g. firmness, elasticity, viscosity)
  • Selective photometric analyses

Bioconversion

Current projects

Research project to systematically investigate the formation of exopolysaccharides (EPS) by lactic acid bacteria in plant-based side stream matrices. The aim is to establish a scientific basis for using microbiologically produced biopolymers to improve texture and structure in sustainable foods.

Feasibility study on using invasive crayfish as a raw material to produce a fermented seasoning using koji fermentation. The aim is to develop a sustainable, sensorially appealing fermentation concept in line with circular economy principles.

Feasibility study on using short, controlled fermentation processes to naturally enhance the flavour of plant-based products. The aim is to integrate clean-label-compliant fermentation steps into industrial production processes.

Completed projects

Protective cultures

Current projects

Research project developing microbial protective cultures to reduce post-harvest losses in carrots. The aim is to develop practical, bio-based applications along the value chain, from storage to marketing.

Completed projects

Selected publications

Team & Contact

Are you interested in working with us, or would you like to know more about our research activities in the field of bioconversion and protective cultures? Please get in touch.