Original scientific paper

Fed-Batch Fermentation using a Concentrated Medium

Usama Beshay ; Bioprocess Development Dept., Genetic Engineering & Biotechnology Research Institute (GEBRI), Mubarak City for Scientific Research and Technology Applications, New Bourg El-Arab City, Alexandria, Egypt

Abstract

To increase cell concentration and the production of alkaline protease, fed-batch cultures with standard medium (1x) or concentrated medium (2x or 5x) as feed were performed. In a fed-batch culture with standard medium as feed, the biomass concentration reached 9.6 g l-1 and the protease activity obtained was 8500 U ml-1 compared to 3000 U ml-1 obtained by growing Teredinobacter turnirae cells with standard PB-medium in batch culture. For further increase of process efficiency, a high density fed-batch process was developed, where concentrated medium is fed to the cells. Fed-batch process using concentrated medium was evaluated for its ability to improve cell growth and protease titer of T. turnirae. It was found to result in up to 3.9-fold increase in final protease activity compared to batch culture control.

Keywords

Teredinobacter turnirae; alkaline protease; fed-batch culture; concentrated medium

Hrčak ID:

21404

URI

https://hrcak.srce.hr/21404

Publication date:

28.3.2008.

Visits: 1.233 *