Utilization of spent brewer’s yeast for supplementation of distillery corn mashes

Abstract

The aim of the study was to use spent brewer's yeast biomass (SBY) as a nutrient adjunct of distillery type corn mashes to improve the process of ethanol fermentation by yeast Saccharomyces cerevisiae. There were prepared corn mashes with raw material loading at 20% ww. with SBY addition at solids loadings of 0 (control); 0.1; 0.5; 0.7; 1.0; 3.0 and 5.0% ww. The obtained mashes were inoculated with yeast and subjected to batch fermentation for 72 h. It was observed that supplementation of corn mashes with SBY improved the process of fermentation. The consumption of sugars and production of ethanol by yeast in supplemented mashes was accelerated and the overall ethanol yield was improved by 6.5 to 11% depending on the amount of added SBY. It was also observed that the fermentation could be shortened by 24 h in mashes enriched with SBY.

More than just a beer—the potential applications of by-products from beer manufacturing in polymer technology

“…Moreover, brewery spent yeast can be applied as nutrients during ethanol or lactic acid fermentation [238,239]. Pietrzak and Kawa-Rygielska [240] showed that the 5% addition of brewery spent yeast might increase the rate of sugar consumption and ethanol production resulting in even 11% enhancement of ethanol yield. Such an effect was ascribed to the high nitrogen content of the medium.…”

Emergent food proteins – Towards sustainability, health and innovation

“…Microbial protein may also be a coproduct to be recovered after industrial processes, such spent yeast (Patent No. US 9,963,671 B2, 2018) or algae (Chandra, Iqbal, Vishal, Lee, & Nagra, 2019;Laurens et al, 2017) from biorefineries and brewery industries (Pietrzak & Kawa-Rygielska, 2013;Vieira, Cunha, & Ferreira, 2018). Additionally, molecular biology techniques have been employed to improve or add value to the processes, such as improvement of metabolic routes for the use of agro-industrial wastes in simultaneous production of SCP and lipase by Yarrowia lipolytica (Yan et al, 2018).…”