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Study of Brewer's Spent Grain Environmentally Friendly Processing Ways.

Konstantin V Kobelev¹, Irina N Gribkova¹, Larisa N Kharlamova¹

¹All-Russian Scientific Research Institute of Brewing, Beverage and Wine Industry-Branch of V.M. Gorbatov Federal Research Center for Food Systems, 119021 Moscow, Russia.

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Summary

Electrolyzed catholyte water efficiently extracts compounds from brewer's spent grain, with optimal conditions varying by compound type. Pressure enhances polysaccharide and nitrogenous compound extraction but reduces sugars and phenolics.

Keywords:

ECA treatment water brewer’s spent grain brewer’s spent grain structure organic compounds processing

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Area of Science:

Food Science and Technology
Biochemistry
Green Chemistry

Background:

Brewer's spent grain (BSG) is a rich plant-based byproduct with potential for valuable compound extraction.
Electrolytically activated water (EAW), specifically catholyte (pH 9.3), is explored as a sustainable extraction medium.

Purpose of the Study:

To investigate the efficacy of catholyte for extracting diverse organic compounds from BSG.
To determine optimal extraction parameters (pressure, time, temperature) for different compound classes.

Main Methods:

Brewer's spent grain was processed via mashing, filtration, and washing.
Extraction experiments were conducted using catholyte under atmospheric and excess pressure (0.5-1 atm).
High-Performance Liquid Chromatography (HPLC) was used for quantitative analysis of extracted compounds.
Mathematical analysis and correlation methods were applied to interpret results and identify formation regularities.

Main Results:

Catholyte extraction at atmospheric pressure and 50°C for 120 min yielded superior results for β-glucan, sugars, nitrogenous, and phenolic compounds compared to water extraction.
Excess pressure conditions (0.5-1 atm) increased non-starch polysaccharide and nitrogenous compound accumulation but decreased sugars and phenolics with longer extraction times.
Ultrasonic treatment with catholyte effectively extracted β-glucan and nitrogenous fractions, but not sugars or phenolics.
Syringic and vanillic acids were identified as key influencers in furan compound formation under different pressure conditions.

Conclusions:

Catholyte facilitates efficient extraction of carbohydrate, nitrogenous, and monophenolic compounds, particularly under pressure.
Flavonoid extraction efficiency is improved by reducing extraction time under pressure conditions.
The study highlights catholyte as a promising green solvent for valorizing brewer's spent grain.