title: Two-dimensional fluorescence spectroscopy: a novel approach for controlling fed-batch cultivations.
abstract: In industrial fed-batch cultivations it is often necessary to control substrate concentrations at a low level to prevent the production of overflow metabolites and thus optimize the biomass yield. A new method for on-line monitoring and fed-batch control based on fluorescence measurements has been developed. Via instantaneous in situ measurements and multivariate data analysis a chemometric model has been established, which enables the rapid detection of ethanol production at aerobic Saccharomyces cerevisiae fed-batch cultivations. The glucose feed rate is controlled by predicting the metabolic state directly from the fluorescence intensities. Thus, ethanol production could be avoided completely while increasing the biomass yield accordingly. The robust instrumentation is suitable for industrial applications.
authors.affiliation: Institut für Technische Chemie, Callinstrasse 3, 30167 Hannover, Germany.
authors.forename: K
authors.initials: K
authors.lastname: Hantelmann
authors.forename: M
authors.initials: M
authors.lastname: Kollecker
authors.forename: D
authors.initials: D
authors.lastname: Hüll
authors.forename: B
authors.initials: B
authors.lastname: Hitzmann
authors.forename: T
authors.initials: T
authors.lastname: Scheper
mesh_terms: D000332:Aerobiosis; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology*; D002245:Carbon Dioxide / Q000378:metabolism; D018929:Cell Culture Techniques; D000431:Ethanol / Q000378:metabolism; D005246:Feedback; D005285:Fermentation; D005947:Glucose / Q000378:metabolism; D007218:Industrial Microbiology / Q000379:methods*; D007700:Kinetics; D016014:Linear Models; D009862:Online Systems; D010084:Oxidation-Reduction; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence
chemical_list: D002245:Carbon Dioxide; D000431:Ethanol; D005947:Glucose