Please use this identifier to cite or link to this item: https://scholarhub.balamand.edu.lb/handle/uob/2511
Title: S. cerevisiae fermentation activity after moderate pulsed electric field pre-treatments
Authors: Mattar, Jessy
Turk, Mohammad F.
Nonus, Maurice
Lebovka, Nikolai I.
Zakhem, Henri El 
Vorobiev, Eugene
Affiliations: Department of Chemical Engineering 
Keywords: S.cerevisiae
Pulsed fields
Electrostimulation
Subjects: Biomass
Fermentation
Issue Date: 2015
Part of: Bioelectrochemistry
Volume: 103
Issue: 6
Start page: 92
End page: 97
Abstract: 
The batch fermentation process, inoculated by Pulsed Electric Field (PEF) treated wine yeasts (Saccharomyces cerevisiae Actiflore F33), was studied. PEF treatment was applied to the aqueous yeast suspensions ([Y] = 0.012 g/L) at the electric field strengths of E = 100 and 6000 V/cm using the same treatment protocol (number of pulses n = 1000, pulse duration ti = 100 μs, and pulse repetition time Δt = 100 ms). Electrical conductivity was increasing during and after the PEF treatment, which reflected cell electroporation. Then, fermentation was run for 150 h in an incubator (30 °C) with synchronic agitation. Electro-stimulation was revealing itself by the improvement of fermentation characteristics, and thus increased yeast metabolism. At the end of the lag phase (t = 40 h), fructose consumption in samples with electrically activated inoculum exceeded that of the control samples by ≈ 2.33 times for E = 100 V/cm and by ≈ 3.98 for E = 6000 V/cm. At the end of the log phase (120 h of fermentation), ≈ 30% mass reduction was reached in samples with PEF-treated inocula (E = 6000 V/cm), whereas the same mass reduction of the control sample required approximately 20 extra hours of fermentation.
URI: https://scholarhub.balamand.edu.lb/handle/uob/2511
DOI: 10.1016/j.bioelechem.2014.08.016
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Chemical Engineering

Show full item record

SCOPUSTM   
Citations

24
checked on May 8, 2021

Google ScholarTM

Check

Dimensions Altmetric

Dimensions Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.