title: Ethanol Production from Extruded Thermoplastic Maize Meal by High Gravity Fermentation with Zymomonas mobilis.
abstract: A comparative study of extruded and ground maize meals as raw materials for the production of regular (12°P) and high gravity (20°P) worts was devised. Extruded water solubility index (WSI) was higher (9.8 percentage units) and crude fat was lower (2.64 percentage units) compared to ground maize. Free-amino nitrogen compounds (FAN), pH, and glucose were evaluated in regular and high gravity worts produced from ground or extruded maize. Extrusion improved glucose content and ethanol yield. In 20°P mashes, extrusion is enhanced by 2.14% initial glucose compared with regular ground mashes. The 12°P and 20°P extruded treatments averaged 12.2% and 8.4% higher ethanol, respectively, compared to the uncooked counterpart. The 20°P worts fermented with Zymomonas mobilis produced 9.56% more ethanol than the 12°P counterpart. The results show that the combination of extrusion and fermentation of 20°P worts improved ethanol yield per kg flour until 20.93%. This pretreatment stimulates Z. mobilis fermentation efficiency.
authors.affiliation: Centro de Biotecnología FEMSA, Tecnológico de Monterrey, Avenida Eugenio Garza Sada 2501 Sur, Col. Tecnológico, 64849 Monterrey, NL, Mexico.
authors.forename: Mayeli
authors.initials: M
authors.lastname: Peralta-Contreras
authors.affiliation: Centro de Biotecnología FEMSA, Tecnológico de Monterrey, Avenida Eugenio Garza Sada 2501 Sur, Col. Tecnológico, 64849 Monterrey, NL, Mexico.
authors.forename: Edna
authors.initials: E
authors.lastname: Aguilar-Zamarripa
authors.affiliation: Centro de Biotecnología FEMSA, Tecnológico de Monterrey, Avenida Eugenio Garza Sada 2501 Sur, Col. Tecnológico, 64849 Monterrey, NL, Mexico.
authors.forename: Esther
authors.initials: E
authors.lastname: Pérez-Carrillo
authors.affiliation: Centro de Investigación y Desarrollo en Ciencias de la Salud/UOIE, Universidad Autónoma de Nuevo León (UANL), Avenida Carlos Canseco s/n con Avenida Gonzalitos, Mitras Centro, 64460 Monterrey, NL, Mexico.
authors.forename: Erandi
authors.initials: E
authors.lastname: Escamilla-García
authors.affiliation: Centro de Biotecnología FEMSA, Tecnológico de Monterrey, Avenida Eugenio Garza Sada 2501 Sur, Col. Tecnológico, 64849 Monterrey, NL, Mexico.
authors.forename: Sergio Othon
authors.initials: SO
authors.lastname: Serna-Saldívar