scholarly journals The utilization of non-protein nitrogen in the bovine rumen. 8. The nutritive value of the proteins of preparations of dried rumen bacteria, rumen protozoa and brewer's yeast for rats

1954 ◽  
Vol 56 (1) ◽  
pp. 151-156 ◽  
Author(s):  
Mary L. McNaught ◽  
E. C. Owen ◽  
Kathleen M. Henry ◽  
S. K. Kon
Keyword(s):  
Nutritive Value ◽  
Rumen Bacteria ◽  
Brewer’S Yeast ◽  
Protein Nitrogen ◽  
Bovine Rumen ◽  
Brewer's Yeast ◽  
Rumen Protozoa

scholarly journals Spent Craft Brewer's Yeast Reduces Production of Methane and Ammonia by Bovine Rumen Microbes

2021 ◽  
Vol 2 ◽  
Author(s):  
Robert W. Bryant ◽  
E. E. Rhys Burns ◽  
Christopher Feidler-Cree ◽  
Denia Carlton ◽  
Michael D. Flythe ◽  
...  
Keyword(s):  
Colorimetric Assay ◽  
Biologically Active ◽  
Brewer’S Yeast ◽  
Rumen Microbes ◽  
Bovine Rumen ◽  
Brewer's Yeast ◽  
Industry Standard ◽  
Significant Research ◽  
Brewing Process

Methane and ammonia are byproducts of rumen fermentation that do not promote animal growth, and methane is a key contributor to anthropogenic climate disruption. Cows eructate every few breaths and typically emit 250–500 L of methane gas daily. Significant research is focused on finding diets and additives that lower the production of methane and ammonia. Emerging research has shown that humulones and lupulones, molecules that are found in the cones of hops (Humulus lupulus), have potential in this regard. These molecules, which are also key flavor components in beer, are biologically active: they are known inhibitors of Gram-positive bacteria. Ruminants' sophisticated digestive systems host billions of microorganisms, and these systems' outputs will likely be affected in the presence of brewer's yeast (Saccharomyces cerevisiae). So-called spent yeast is produced during the beer-brewing process and contains humulones and lupulones in concentrations that vary by beer style, but it is generally discarded as waste. Our research suggests that adding spent craft brewer's yeast to rumen microbes by single time-point 24-h in vitro incubations suppresses production of methane and ammonia. This project examines the correlation between the quantities of hop acids in spent yeast and the production of methane and ammonia by bovine rumen microbes in vitro. We determined, by HPLC, the hop acid concentrations in spent yeast obtained from six beer styles produced at a local brewery. We performed anaerobic incubation studies on bovine rumen microbes, comparing the effects of these materials to a baker's yeast control and to the industry-standard antibiotic monensin. Results include promising decreases in both methane (measured by GC–FID) and ammonia (measured by colorimetric assay) in the presence of craft brewer's yeast, and a strong correlation between the quantities of hop acids in the spent yeast and the reduction of methane and ammonia. Notably, two of the yeast samples inhibited methane production to a greater degree than the industry-standard antibiotic monensin. Our results suggest that spent brewer's yeast has potential to improve ruminant growth while reducing anthropogenic methane emission.

scholarly journals Spent Brewer’s Yeast as a Source of Insoluble β-Glucans

2021 ◽  
Vol 22 (2) ◽  
pp. 825
Author(s):  
Ionut Avramia ◽  
Sonia Amariei
Keyword(s):  
Emulsion Stability ◽  
Extraction Process ◽  
Brewer’S Yeast ◽  
Brewer's Yeast ◽  
Brewing Process ◽  
Food Applications ◽  
Water Holding ◽  
Potential Food ◽  
Insight Into

In the brewing process, the consumption of resources and the amount of waste generated are high and due to a lot of organic compounds in waste-water, the capacity of natural regeneration of the environment is exceeded. Residual yeast, the second by-product of brewing is considered to have an important chemical composition. An approach with nutritional potential refers to the extraction of bioactive compounds from the yeast cell wall, such as β-glucans. Concerning the potential food applications with better textural characteristics, spent brewer’s yeast glucan has high emulsion stability and water-holding capacity fitting best as a fat replacer in different food matrices. Few studies demonstrate the importance and nutritional role of β-glucans from brewer’s yeast, and even less for spent brewer’s yeast, due to additional steps in the extraction process. This review focuses on describing the process of obtaining insoluble β-glucans (particulate) from spent brewer’s yeast and provides an insight into how a by-product from brewing can be converted to potential food applications.

Ultrafiltration performance of spent brewer’s yeast protein hydrolysate: impact of pH and membrane material on fouling

2021 ◽  
pp. 110569
Author(s):  
Gabriela Vollet Marson ◽  
Débora Tamires Vitor Pereira ◽  
Mariana Teixeira da Costa Machado ◽  
Marco Di Luccio ◽  
Julian Martínez ◽  
...  
Keyword(s):  
Protein Hydrolysate ◽  
Membrane Material ◽  
Brewer’S Yeast ◽  
Yeast Protein ◽  
Brewer's Yeast

scholarly journals The kinetics of alcoholic fermentation of sugars by brewer's yeast

1935 ◽  
Vol 29 (4) ◽  
pp. 931-936 ◽  
Author(s):  
Reginald Haydn Hopkins ◽  
Richard Henry Roberts
Keyword(s):  
Alcoholic Fermentation ◽  
Brewer’S Yeast ◽  
Brewer's Yeast ◽  
Kinetics Of
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