In brewing operations, spent yeast is one of the bye product of the industrial operations.
What forms of benefits can be gained from the spent yeast? Can it be processed for use in any agro-allied ventures.
Colleagues, I need an expert opinion on this. Thanks
But please the spent grains and yeast are they the same thing as per the usage. @Pedro
I think Pedro Nakasu
Pedro Nakasu got confused between brewers' spent grains and spent yeast. They are not the same thing. Charles AnukwonkeThe spent yeast from the brewing process is suitable for use as an efficient starting material to produce yeast extract [1,3]. Yeast extract is generally defined as the soluble content of a yeast cell that remains once the cell wall has been destroyed and removed [4,5,6]. The variety of different physiologically valuable substances in yeast cells offers the possibility of using them as yeast extract in different areas of the food industry [3,7]. As “yeast food”, these extracts can therefore increase the free α-amino nitrogen (FAN) when fermenting beer worts with a high content of unmalted grains [8] or a high extract content (high-gravity worts) [9,10], and consequently improve the yeast’s nutrient supply and fermentation performance [11,12]. Free proteinogenic amino acids supply the majority of the FAN [12]. The quantity and composition of the relevant amino acids are ultimately critical to performance during fermentation [13] and also impact the beer’s aroma profile [14]. From a nutritional standpoint, yeast extracts from spent yeast supply a high concentration of essential and semi-essential amino acids for human beings [5,7]. Yeast extracts are also a good source of B vitamins [6,15]. Among these, the various naturally occurring folate vitamers play an essential role in the human diet, with the biologically active form 5-methyltetrahydrofolate (5-CH3-H4folate) fulfilling key metabolic tasks in human cells [16]. The bioactivity of yeast extracts, which is demonstrated in the form of reduction and anti-oxidative potential, also makes these extracts particularly interesting for the food industry [6,7,15,17].
Article Spent Yeast from Brewing Processes: A Biodiverse Starting Ma...
PS: for Brewers' spent grain, you can refer to this paper from our group - Article Novel Drying Methods for Sustainable Upcycling of Brewers’ S...
Brewers Spent yeasts can also be used in the bioremediation of heavy metals. Please see the paper: “Cleanup of industrial effluents containing heavy metals: a new opportunity of valorising the biomass produced by brewing industry”. Appl Microbiol Biotechnol (2013) 97:6667–6675.
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