title: Flow cytometry and phytochemical analysis of a sunflower cell suspension culture in a 5-L bioreactor.
abstract: A cell suspension culture of sunflower (Helianthus annuus), a producer of immunologically active polysaccharides, was cultivated in a 5-L stirred tank bioreactor, operated in batch mode. After some changes in the internal bioreactor design a stable growth of Helianthus cells was achieved and the accumulated biomass reached 15.2 g/L (only approximately 5% lower compared to the accumulated biomass in shake-flasks). Flow cytometry used for measuring the cell cycle parameters of suspended Helianthus cells did not reveal significant differences between shake-flasks and bioreactor cultivation modes. For both cultivation methods significant enhancement of the percentage of S-phase cells was observed at the beginning of the cultivation process. Concerning the metabolite production the maximum in exopolysaccharides was reached at day 9 of the cultivation period (1.9 g/L), while the highest amounts of alpha-tocopherol were accumulated at the beginning of the cultivation process (day 2 of the cultivation). These finding were related to the respective stress levels caused by the inoculation procedure. The kinetic parameters of growth and polysaccharide production as well as the time course of carbon source utilization were monitored and discussed.
authors.affiliation: Institute of Food Technology and Bioprocess Engineering, Dresden University of Technology, Bergstrasse 120, D-01069 Dresden, Germany.
authors.forename: Christiane
authors.initials: C
authors.lastname: Haas
authors.forename: Jost
authors.initials: J
authors.lastname: Weber
authors.forename: Jutta
authors.initials: J
authors.lastname: Ludwig-Müller
authors.forename: Sandra
authors.initials: S
authors.lastname: Deponte
authors.forename: Thomas
authors.initials: T
authors.lastname: Bley
authors.forename: Milen
authors.initials: M
authors.lastname: Georgiev
mesh_terms: D000081:Acetamides; D019149:Bioreactors; D002244:Carbon / Q000378:metabolism; D002453:Cell Cycle; D002455:Cell Division; D005434:Flow Cytometry; D005463:Fluoroacetates; D016193:G1 Phase; D006368:Helianthus / Q000166:cytology* / Q000502:physiology; D010101:Oxygen Consumption; D010938:Plant Oils / Q000737:chemistry* / Q000302:isolation & purification; D011134:Polysaccharides / Q000302:isolation & purification; D016192:Resting Phase, Cell Cycle; D000074242:Sunflower Oil; D014297:Trimethylsilyl Compounds
chemical_list: D000081:Acetamides; D005463:Fluoroacetates; D010938:Plant Oils; D011134:Polysaccharides; D000074242:Sunflower Oil; D014297:Trimethylsilyl Compounds; C086665:N-methyl-N-(trimethylsilyl)trifluoroacetamide; D002244:Carbon