Co-production of bioethanol and probiotic yeast biomass from agricultural feedstock: application of the rural biorefinery concept

Hull, Claire M, Loveridge, Edric Joel, Donnison, Iain S, Kelly, Diane E and Kelly, Steven L 2014. Co-production of bioethanol and probiotic yeast biomass from agricultural feedstock: application of the rural biorefinery concept. AMB Express 4 (1) , 64. 10.1186/s13568-014-0064-5

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Abstract

Microbial biotechnology and biotransformations promise to diversify the scope of the biorefinery approach for the production of high-value products and biofuels from industrial, rural and municipal waste feedstocks. In addition to bio-based chemicals and metabolites, microbial biomass itself constitutes an obvious but overlooked by-product of existing biofermentation systems which warrants fuller attention. The probiotic yeast Saccharomyces boulardii is used to treat gastrointestinal disorders and marketed as a human health supplement. Despite its relatedness to S. cerevisiae that is employed widely in biotechnology, food and biofuel industries, the alternative applications of S. boulardii are not well studied. Using a biorefinery approach, we compared the bioethanol and biomass yields attainable from agriculturally-sourced grass juice using probiotic S. boulardii (strain MYA-769) and a commercial S. cerevisiae brewing strain (Turbo yeast). Maximum product yields for MYA-769 (39.18 [±2.42] mg ethanol mL−1 and 4.96 [±0.15] g dry weight L−1) compared closely to those of Turbo (37.43 [±1.99] mg mL−1 and 4.78 [±0.10] g L−1, respectively). Co-production, marketing and/or on-site utilisation of probiotic yeast biomass as a direct-fed microbial to improve livestock health represents a novel and viable prospect for rural biorefineries. Given emergent evidence to suggest that dietary yeast supplementations might also mitigate ruminant enteric methane emissions, the administration of probiotic yeast biomass could also offer an economically feasible way of reducing atmospheric CH4.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Chemistry
Subjects:	Q Science > QD Chemistry
Additional Information:	his is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://​creativecommons.​org/​licenses/​by/​4.​0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
Publisher:	Springer
ISSN:	2191-0855
Date of First Compliant Deposit:	30 March 2016
Date of Acceptance:	4 August 2014
Last Modified:	23 May 2023 14:34
URI:	https://orca.cardiff.ac.uk/id/eprint/87771

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