Abstract
The now well established principles of genetic engineering are described in relation to the solution of problems associated with β-glucans in beer. The application of these techniques has enabled the isolation of a Bacillus subtilis endo-1, 3–1, 4-β-D-glucanase gene which expresses a biologically active enzyme in yeast.15,16 Although this enzyme is capable of hydrolysing beer β-glucans during fermentation, thereby enhancing beer filtration, insufficient β-glucanase is produced in yeast to enable successful commercial implementation. The requirements for the efficient production of β-glucanase in genetically manipulated brewing yeast are described.
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