title: Efficient ethanol production from potato and corn processing industry waste using E. coli engineered to express Vitreoscilla haemoglobin.
abstract: Engineering of ethanologenic E. coli to express the haemoglobin (VHb) from the bacterium Vitreoscilla has been shown to enhance ethanol production by fermentation of pure sugars, sugars from hydrolysis of lignocellulose, components of whey, and sugars from wastewater produced during potato processing. Here, these studies were extended to see whether the same effect could be seen when a mixture of waste materials from processing of potatoes and corn into potato and corn chips were used as sugar sources. Consistent increases in ethanol production coincident with VHb expression were seen in shake flasks at both low aeration and high aeration conditions. The ethanol increases were due almost entirely to increases in the amount of ethanol produced per unit of cell mass. The VHb strategy for increasing fermentation to ethanol (and perhaps other valuable fermentation products) may be of general use, particularly regarding conversion of otherwise discarded materials into valuable commodities.
authors.affiliation: a Department of Molecular Biology and Genetics , Gebze Technical University , Gebze , Kocaeli 41400 , Turkey.
authors.forename: Fatma
authors.initials: F
authors.lastname: Sumer
authors.forename: Benjamin C
authors.initials: BC
authors.lastname: Stark
authors.forename: Meltem
authors.initials: M
authors.lastname: Yesilcimen Akbas
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D056804:Biofuels / Q000032:analysis / Q000382:microbiology*; D019149:Bioreactors / Q000382:microbiology; D050260:Carbohydrate Metabolism; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D000431:Ethanol / Q000378:metabolism*; D005285:Fermentation; D005818:Genetic Engineering; D006868:Hydrolysis; D007220:Industrial Waste / Q000032:analysis; D008031:Lignin / Q000378:metabolism; D011198:Solanum tuberosum / Q000378:metabolism*; D054793:Truncated Hemoglobins / Q000235:genetics* / Q000378:metabolism; D020589:Vitreoscilla / Q000235:genetics* / Q000378:metabolism; D062065:Wastewater / Q000032:analysis / Q000382:microbiology; D003313:Zea mays / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D056804:Biofuels; D000431:Ethanol; D007220:Industrial Waste; D008031:Lignin; D054793:Truncated Hemoglobins; D062065:Wastewater; C082613:hemoglobin protein, Vitreoscilla; C036909:lignocellulose
keywords: E. coli; ethanol; Vitreoscilla haemoglobin; corn fibre; potato processing waste