Objectif
We defined and optimized a medium and a batch fermentation process at laboratory level which allows the production of a sufficient lactobacilli biomass between 5E9 till 10E9 CFU/ml of broth medium.
We demonstrated feasability of mix optimal fermentation on dextrose and lactose of both strains in a batch process, managing the inoculum rate: an equilibrated biomass was achieved with a biomass level superior to 1E9 CFU/ml for each strain.
We developed a specific microencapsulation process using a laboratory pilot spray-drying process. The bacteria, in acqueous suspension with specific low viscosity polymers and protectants, are sprayed in tiny droplets in a sparing temperature-scale air flow. The maximal biomass level achieved was 10E9 CFU/g.
The entire line (fermentation and microencapsulation-drying step) was then assembled and optimized on basis of the maximum revivifiability of the dried biomass and of stability of dried biomass during further storage.
This optimized process allowed a quite good revivifiability rate (between 40 to 70 %) and a 3-to 6-month stability of achieved biomass.
Feasability of scale up pilot production was tested on a 10 then a 20 times scale. The same results were achieved on stability and revivifiability. Nevertheless we do not succeed in collecting an important biomass in the powder (about 1E9 CFU/g). The use of multi-stage dryer will certainly permit us to optimize the final population recovery.
In addition, the scale up permits to generate productivity gain from 3 to 6 times because of drying tower height (laboratory pilote dryer course was short).
Industrial exploitation in planned in 1997 on piglets feed industry on the basis of European directives 87/153 and 94/40. Experiment on weaned piglets (1 kg/ton of 1E9 CFU/g product) has demonstrated a 9% improvement on average daily growth and 5% improvement on feed conversion (piglets from 4 to 10 weeks).
Champ scientifique (EuroSciVoc)
CORDIS classe les projets avec EuroSciVoc, une taxonomie multilingue des domaines scientifiques, grâce à un processus semi-automatique basé sur des techniques TLN.
CORDIS classe les projets avec EuroSciVoc, une taxonomie multilingue des domaines scientifiques, grâce à un processus semi-automatique basé sur des techniques TLN.
- sciences naturellessciences biologiquesmicrobiologiebactériologie
- sciences naturellessciences chimiquesscience des polymères
- sciences socialeséconomie et affaireséconomieéconomie de la productionproductivité
- sciences agricolesbiotechnologie agricolebiomasse
- ingénierie et technologiebiotechnologie industrielletechnologies de biotraitementfermentation
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CSC - Cost-sharing contractsCoordinateur
22940 Plaintel
France