On the possibility of using biologically active substances of aspen bark in brewing

The integrated use of aspen biomass can ensure the effective development of forestry and timber processing industries, reduce the share of waste. From the bark of aspen we obtained aqueous and water-alcohol extracts containing a complex of extractive substances possessing biological activity and representing practically all classes of organic compounds found in plants (vitamins, enzymes, proteins, fats, essential oils, etc.). As a raw material, a crushed aspen bark with a moisture content of 5% and an equivalent particle diameter of 2 mm was used. Extractants – water distilled and water-alcoholic solution 1:1. Extraction conditions: hydromodule– 10 g/g, temperature – 40°C, ultrasound frequency – 44 kHz. The effect of water-alcohol extracts on the fermentation of sucrose by beer yeast S-33 was studied. The expediency of using water-alcohol extract of aspen cortex at a dosage of 1% of the nutrient medium is shown. At the same time ferment activity of yeast increases, sugar consumption decreases by the side processes of fermentation, the economic coefficient showing the yield of ethanol from a unit of substrate is increased by 5,5% in comparison with the control...