title: Integrated production of lactic acid and biomass on distillery stillage.
abstract: The possibilities of parallel lactic acid and biomass production in batch and fed-batch fermentation on distillery stillage from bioethanol production were studied. The highest lactic acid yield and productivity of 92.3 % and 1.49 g L(-1) h(-1) were achieved in batch fermentation with initial sugar concentration of 55 g L(-1). A significant improvement of the process was achieved in fed-batch fermentation where the concentration of lactic acid was increased to 47.6 % and volumetric productivity for 21 % over the batch process. A high number of Lactobacillus rhamnosus ATCC 7469 viable cells of 10(9) CFU ml(-1) was attained at the end of fed-batch fermentation. The survival of 92.9 % of L. rhamnosus cells after 3 h of incubation at pH 2.5 validated that the fermentation media remained after lactic acid removal could be used as a biomass-enriched animal feed thus making an additional value to the process.
authors.affiliation: Department of Biochemical Engineering and Biotechnology, Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia. adjukic@tmf.bg.ac.rs
authors.forename: Aleksandra P
authors.initials: AP
authors.lastname: Djukić-Vuković
authors.forename: Ljiljana V
authors.initials: LV
authors.lastname: Mojović
authors.forename: Maja S
authors.initials: MS
authors.lastname: Vukašinović-Sekulić
authors.forename: Svetlana B
authors.initials: SB
authors.lastname: Nikolić
authors.forename: Jelena D
authors.initials: JD
authors.lastname: Pejin
mesh_terms: D018533:Biomass; D019344:Lactic Acid / Q000096:biosynthesis*; D052201:Lacticaseibacillus rhamnosus / Q000254:growth & development*; D013997:Time Factors
chemical_list: D019344:Lactic Acid