title: Techno-economic implications of improved high gravity corn mash fermentation.
abstract: The performance of Saccharomyces cerevisiae MBG3964, a strain able to tolerate >18% v/v ethanol, was compared to leading industrial ethanol strain, Fermentis Ethanol Red, under high gravity corn mash fermentation conditions. Compared to the industrial ethanol strain, MBG3964 gave increased alcohol yield (140g L(-1) vs. 126g L(-1)), lower residual sugar (4g L(-1) vs. 32g L(-1)), and lower glycerol (11g L(-1) vs. 12g L(-1)). After 72h fermentation, MBG3964 showed about 40% viability, whereas the control yeast was only about 3% viable. Based on modelling, the higher ethanol tolerant yeast could increase the profitability of a corn-ethanol plant and help it remain viable through higher production, lower unit heating requirements and extra throughput. A typical 50M gal y(-1) dry mill ethanol plant that sells dried distiller's grain could potentially increase its profit by nearly $US3.4M y(-1) due solely to the extra yield, and potentially another $US4.1M y(-1) if extra throughput is possible.
authors.affiliation: Microbiogen Pty Ltd., Sydney, Australia. arthur.kollaras@microbiogen.com
authors.forename: Arthur
authors.initials: A
authors.lastname: Kollaras
authors.forename: John M
authors.initials: JM
authors.lastname: Kavanagh
authors.forename: Geoffrey L
authors.initials: GL
authors.lastname: Bell
authors.forename: Dragana
authors.initials: D
authors.lastname: Purkovic
authors.forename: Sophia
authors.initials: S
authors.lastname: Mandarakas
authors.forename: Psyche
authors.initials: P
authors.lastname: Arcenal
authors.forename: Woon Siew
authors.initials: WS
authors.lastname: Ng
authors.forename: Kai S
authors.initials: KS
authors.lastname: Routledge
authors.forename: Drew H
authors.initials: DH
authors.lastname: Selwood
authors.forename: Paul
authors.initials: P
authors.lastname: Koutouridis
authors.forename: Ferdinand E
authors.initials: FE
authors.lastname: Paras
authors.forename: Peter
authors.initials: P
authors.lastname: Milic
authors.forename: Eduardo S
authors.initials: ES
authors.lastname: Tirado-Escobar
authors.forename: Michael J B
authors.initials: MJ
authors.lastname: Moore
authors.forename: Philip J L
authors.initials: PJ
authors.lastname: Bell
authors.forename: Paul V
authors.initials: PV
authors.lastname: Attfield
mesh_terms: D000085:Acetates / Q000737:chemistry / Q000378:metabolism; D056804:Biofuels / Q000191:economics; D002851:Chromatography, High Pressure Liquid; D000431:Ethanol / Q000737:chemistry / Q000378:metabolism*; D005285:Fermentation; D005947:Glucose / Q000737:chemistry / Q000378:metabolism; D005990:Glycerol / Q000737:chemistry / Q000378:metabolism; D008962:Models, Theoretical; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D003313:Zea mays / Q000378:metabolism*
chemical_list: D000085:Acetates; D056804:Biofuels; D000431:Ethanol; D005947:Glucose; D005990:Glycerol