Detrimental effect of increasing sugar concentrations on ethanol production from maize or decorticated sorghum mashes fermented with Saccharomyces cerevisiae or Zymomonas mobilis: biofuels and environmental biotechnology.
The efficiency of ethanol fermentation, as affected by grain source (maize and decorticated red sorghum), total sugar concentration (13 or 20° Plato) and type of microorganism (Saccharomyces cerevisiae or Zymomonas mobilis) was studied. Maize mashes yielded 0.32 l ethanol kg(-1) ground grain whereas mashes prepared with decorticated red sorghum produced 0.28 l ethanol kg(-1). Both microorganisms yielded similar amounts of ethanol. However, high-gravity mashes (20° Plato) yielded lower amounts of ethanol compared to counterparts adjusted to 13° Plato (0.28 vs. 0.22 l ethanol kg(-1) ground grains). In decorticated sorghum mashes adjusted to 20° P, Z. mobilis produced 40 ml kg(-1) more ethanol compared to S. cerevisiae. In addition, Z. mobilis had a lower dependency on nitrogenous compounds.
Pérez-Carrillo
Esther
E
Departamento de Biotecnología e Ingeniería de Alimentos, Centro de Biotecnología, Tecnológico de Monterrey, Av. Eugenio Garza Sada 2501 Sur, 64849 Monterrey, NL, México.
Luisa Cortés-Callejas
M
M
Sabillón-Galeas
Luis E
LE
Montalvo-Villarreal
Jorge L
JL
Canizo
Jesica R
JR
Georgina Moreno-Zepeda
M
M
Serna-Saldivar
Sergio O
SO
D056804:Biofuels; D001709:Biotechnology / Q000379:methods; D050260:Carbohydrate Metabolism; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D045868:Sorghum / Q000378:metabolism*; D003313:Zea mays / Q000378:metabolism*; D017355:Zymomonas / Q000378:metabolism*
D056804:Biofuels; D000431:Ethanol