caa a22 4500 477106099 CHVBK 20180405111554.0 cr unu---uuuuu 170330e19960401xx s 000 0 eng 10.1007/BF01570028 doi (NATIONALLICENCE)springer-10.1007/BF01570028 Evaluation of plastic composite-supports for enhanced ethanol production in biofilm reactors [Elektronische Daten] [M Kunduru, AL Pometto III] Biofilms are a natural form of cell immobilization that result from microbial attachment to solid supports. Biofilm reactors with polypropylene composite-supports containing up to 25% (w/w) of various agricultural materials (corn hulls, cellulose, oat hulls, soybean hulls or starch) and nutrients (soybean flour or zein) were used for ethanol production. Pure cultures ofZymomonas mobilis, ATCC 31821 orSaccharomyces cerevisiae ATCC 24859 and mixed cultures with either of these ethanol-producing microorganisms and the biofilm-formingStreptomyces viridosporus T7A ATCC 39115 were evaluated. An ethanol productivity of 374g L−1 h−1 (44% yield) was obtained on polypropylene composite-supports of soybean hull-zein-polypropylene by usingZ. mobilis, whereas mixed-culture fermentations withS. viridosporus resulted in ethanol productivity of 147.5 g L−1 h−1 when polypropylene composite-supports of corn starch-soybean flour were used. WithS. cerevisiae, maximum productivity of 40 g L−1 h−1 (47% yield) was obtained on polypropylene composite-supports of soybean hull-soybean flour, whereas mixed-culture fermentation withS. viridosporus resulted in ethanol productivity of 190g L−1 h−1 (35% yield) when polypropylene composite-supports of oat hull-polypropylene were used. The maximum productivities obtained without supports (suspension culture) were 124 g L−1 h−1 and 5 g L−1 h−1 withZ. mobilis andS. cerevisiae, respectively. Therefore, forZ. mobilis andS. cerevisiae, ethanol productivities in biofilm fermentations were three- and eight-fold higher than suspension culture fermentations, respectively. Biofilm formation on the chips was detected by weight change and Gram staining of the support material at the end of the fermentation. The ethanol production rate and concentrations were consistently greater in biofilm reactors than in suspension cultures. Society for Industrial Microbiology, 1996 ethanol nationallicence biofilm nationallicence Zymomonas nationallicence Saccharomyces nationallicence Streptomyces nationallicence plastic composite-supports nationallicence Kunduru M. Department of Food Science and Human Nutrition, Center for Crops Utilization Research, Iowa State University, 2312 Food Science Building, 50011, Ames, Iowa, USA aut Pometto III AL Department of Food Science and Human Nutrition, Center for Crops Utilization Research, Iowa State University, 2312 Food Science Building, 50011, Ames, Iowa, USA aut Journal of Industrial Microbiology Springer-Verlag 16/4(1996-04-01), 241-248 0169-4146 16:4<241 1996 16 10295 https://doi.org/10.1007/BF01570028 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01570028 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kunduru M. Department of Food Science and Human Nutrition, Center for Crops Utilization Research, Iowa State University, 2312 Food Science Building, 50011, Ames, Iowa, USA aut NATIONALLICENCE 700 1- Pometto III AL Department of Food Science and Human Nutrition, Center for Crops Utilization Research, Iowa State University, 2312 Food Science Building, 50011, Ames, Iowa, USA aut NATIONALLICENCE 773 0- Journal of Industrial Microbiology Springer-Verlag 16/4(1996-04-01), 241-248 0169-4146 16:4<241 1996 16 10295 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer