Abstract
Saccharomyces cerevisiae is being used for long as a rich source of proteins, sugars, nucleotides, vitamins and minerals. Autolyzed and hydrolyzed yeast biomass has found numerous applications in the health food industry as well as livestock feeds. Here, we have compared three lysis methods for production of yeast lysates using autolysis, plasmolysis (ethyl acetate 1.5%), and enzymatic hydrolysis (Alcalase 0.2%). The efficiency of each process was compared according to soluble solid and protein contents, cell lysis monitoring, and release of intracellular materials, cell viability and microscopic analysis. Results showed that plasmolysis by ethyl acetate was found to be more efficient compared to autolysis, with a higher recovery of yeast extract (YE) content. In comparison, the content of released solids and proteins were higher during the enzymatic hydrolysis using Alcalase compared to autolysis and plasmolysis treatments. The highest decrease in optical density of 600 nm was monitored for the hydrolyzed cells. Besides, we defined “Degree of Leakage (DL)” as a new index of the lysis process, referring to the percentage of total released proteins from the cells and it was estimated to about 65.8%, which represents an appropriate indicator of the cell lysis. The biochemical and biophysical properties of the hydrolyzed yeast product as well as its biological activity (free radical scavenging activity and bacterial binding capacity) suggest that Alcalase could be used to accelerate the lysis of yeast cells and release the valuable intracellular components used for foodstuffs, feed and fermentation media applications.
Graphic abstract
Production of baker’s yeast lysates using autolysis, plasmolysis, and enzymatic hydrolysis methods.
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Acknowledgements
This work was financially supported by Kimiazyme Company, Tehran, Iran. The technical support by Tarbiat Modares University is also gratefully acknowledged.
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The study was supported by Kimiazyme Company. The authors RHS and MN own shares of the company and ZT and RN are Kimiazyme employees. The Kimiazyme employees have financial interests. Kimiazyme is a producer of feed additives for the animal feed market.
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Takalloo, Z., Nikkhah, M., Nemati, R. et al. Autolysis, plasmolysis and enzymatic hydrolysis of baker's yeast (Saccharomyces cerevisiae): a comparative study. World J Microbiol Biotechnol 36, 68 (2020). https://doi.org/10.1007/s11274-020-02840-3
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DOI: https://doi.org/10.1007/s11274-020-02840-3