Investigation of mashing regimes for low-alcohol beer production

Abstract

Low-alcohol beer can be obtained by physical and biological methods. The group of biological methods includes modification of the mashing regimes and changes in the fermentation process. The aim of the present work was to study two mashing regimes for low-alcohol beer production. The increase in the mashing duration at 50 °C led to a linear increase in the extract and the concentration of reducing and fermentable sugars in the wort. It was found that the rate of formation of reducing sugars was higher than that of the formation of fermentable sugars, which can be used for the optimization of the mashing process. The introduction of a pause at 77 °C did not lead to a substantial increase in the concentration of fermentable extract, but did lead to an increase in the total and non-fermentable extract. The available nitrogen content in the laboratory wort was in the range of 120–150 mg/dm3. As a result of conducting fermentation processes with the top-fermenting yeast strain Saccharomyces cerevisiae S-33, it was found that the combination of a small amount of fermentable sugars and a low fermentation temperature led to a beer being obtained that met the requirements for a low-alcohol beverage. Copyright © 2016 The Institute of Brewing & Distilling.