{"id":38234,"date":"2021-06-06T09:54:28","date_gmt":"2021-06-06T09:54:28","guid":{"rendered":"https:\/\/matis.is\/?p=38234"},"modified":"2021-06-06T09:54:30","modified_gmt":"2021-06-06T09:54:30","slug":"ethanol-production-from-sugars-and-complex-biomass-by-thermoanaerobacter-ak5-the-effect-of-electron-scavenging-systems-on-end-product-formation","status":"publish","type":"post","link":"https:\/\/matis.is\/en\/greinar\/ethanol-production-from-sugars-and-complex-biomass-by-thermoanaerobacter-ak5-the-effect-of-electron-scavenging-systems-on-end-product-formation\/","title":{"rendered":"Ethanol production from sugars and complex biomass by thermoanaerobacter Ak (5): The effect of electron-scavenging systems on end-product formation"},"content":{"rendered":"<p>The ethanol production capacity from sugars and lignocellulosic biomass hydrolysates by\u00a0<em>Thermoanaerobacter<\/em>\u00a0strain AK<sub>5<\/sub>\u00a0was studied in batch cultures. The strain converts various carbohydrates to acetate, ethanol, hydrogen, and carbon dioxide. Maximum ethanol yields on glucose and xylose were 1.70 and 1.35 mol (mol sugars)<sup>\u22121<\/sup>, respectively. Increased initial glucose concentration inhibited glucose degradation and end-product formation leveled off at 30 mM. Cultivation of the strain with decreased liquid \u2013 gas (LG) ratios on glucose resulted in a shift to more acetate and less ethanol. End-product formation from glucose was further manipulated by adding extracellular electron acceptor (thiosulfate) or using a coculture of hydrogenotrophic methanogen. In both cases, the hydrogen-scavenging systems resulted in a dramatic shift from ethanol to acetate. Ethanol production from 4.5 g L<sup>\u20131<\/sup>\u00a0of complex biomass hydrolysates (grass, hemp, wheat straw, newspaper, and cellulose) pretreated with acid (0.50% H<sub>2<\/sub>SO<sub>4<\/sub>), alkali (0.50% NaOH), and without acid \/ alkali (control) and the enzymes Celluclast and Novozymes 188 (0.1 mL g<sup>\u20131<\/sup>\u00a0dry weight (dw); 70 and 25 U g<sup>\u20131<\/sup>\u00a0of Celluclast and Novozyme 188, respectively) was investigated. Highest ethanol yields (27.5 mM; 5.5 mM (g biomass)<sup>\u22121<\/sup>) were obtained on cellulose but lowest on hemp leafs (5.1 mM; 0.8 mM g<sup>\u20131<\/sup>). Chemical pretreatment increased ethanol yields substantially from lignocellulosic biomass but not from cellulose. The most-pronounced increase was on straw hydrolysates, where ethanol production increased from 5.5 mM to 15.2 mM on alkali-pretreated biomass. Ethanol yields were increased from 5.5 mM to 7.7 mM g<sup>\u20131<\/sup>\u00a0on cellulose by decreasing the hydrolyzate concentration to 2.25 g L<sup>\u20131<\/sup>, because of incomplete glucose degradation in the higher-loaded system.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/pubs.acs.org\/doi\/10.1021\/ef300754q\">Link to article<\/a><\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>The ethanol production capacity from sugars and lignocellulosic biomass hydrolysates by\u00a0Thermoanaerobacter\u00a0strain AK5\u00a0was studied in batch cultures. The strain converts various [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"template-greinar.php","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[2011],"tags":[],"class_list":["post-38234","post","type-post","status-publish","format-standard","hentry","category-greinar"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ethanol production from sugars and complex biomass by thermoanaerobacter Ak(5): The effect of electron-scavenging systems on end-product formation - Mat\u00eds<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/matis.is\/en\/greinar\/ethanol-production-from-sugars-and-complex-biomass-by-thermoanaerobacter-ak5-the-effect-of-electron-scavenging-systems-on-end-product-formation\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ethanol production from sugars and complex biomass by thermoanaerobacter Ak(5): The effect of electron-scavenging systems on end-product formation - Mat\u00eds\" \/>\n<meta property=\"og:description\" content=\"The ethanol production capacity from sugars and lignocellulosic biomass hydrolysates by\u00a0Thermoanaerobacter\u00a0strain AK5\u00a0was studied in batch cultures. 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