title: Static magnetic fields enhancement of Saccharomyces cerevisae ethanolic fermentation.
abstract: Magnetic effects induced in ethanolic fermentation by Saccharomyces cerevisiae strain DAUFPE-1012 were studied during a 24 h exposure to 220 mT steady magnetic fields (SMF) at 23 +/- 1 degrees C, produced by NdFeB rod magnets. The magnets were attached diametrically opposed (N to S) to a cylindrical tube reactor. The biomass growth in the reactor culture media (yeast extract + glucose 2%) during 24 h was monitored by measurements of optical density, which was correlated to cell dry weight. Ethanol concentration and glucose level were measured every 2 h. The pH of the culture media was maintained between 4 and 5. As a result, biomass (g/L) increased 2.5-fold and ethanol concentration 3.4-fold in magnetized cultures (n = 8) as compared with SMF nonexposed cultures (n = 8). Glucose consumption was higher in magnetized cultures, which correlated to the ethanol yield.
authors.affiliation: Departments of Biophysics and Chemical Engineering, University Federal de Pernambuco, Recife PE 50960.870, Brazil. motta@ufpe.br
authors.forename: Mauricy Alves
authors.initials: MA
authors.lastname: da Motta
authors.forename: João Batista Ferreira
authors.initials: JB
authors.lastname: Muniz
authors.forename: Alexandre
authors.initials: A
authors.lastname: Schuler
authors.forename: Mauricio
authors.initials: M
authors.lastname: Da Motta
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D018929:Cell Culture Techniques / Q000379:methods*; D002455:Cell Division / Q000502:physiology / Q000528:radiation effects; D004574:Electromagnetic Fields; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation / Q000502:physiology / Q000528:radiation effects; D005947:Glucose / Q000378:metabolism*; D011829:Radiation Dosage; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000502:physiology* / Q000528:radiation effects*
chemical_list: D000431:Ethanol; D005947:Glucose