Legumes are an affordable source of vegetable protein, fiber, and vitamins, and due to their high nutritional and biological value, they are widely used in the nutrition of various categories of consumers. The main methods of processing legumes include hydromechanical and hydrothermal treatment, which is aimed at achieving culinary readiness of boiled legumes. Studying the parameters of the specified technological process for the accumulation of dry substances in aquafaba could make it possible to influence the composition and properties of this liquid, which would provide opportunities for its use in the food industry. The influence of hydrothermal processing of leguminous grains on the accumulation of dry matter in aquafaba, as well as the kinetics of moisture content of various types of leguminous grains, have been experimentally investigated, which made it possible to determine the rational parameters of hydromechanical and hydrothermal processing of chickpeas, beans, peas, lentils, with the preparation of boiled leguminous grains and aquafaba. It was determined that during hydromechanical processing intensive moisture absorption occurs in the first hours and reaches up to 80 % of the initial mass, after which the intensity of water absorption decreases somewhat. Rational technological parameters of hydrothermal processing of leguminous grains by two methods, basic (cooking at a temperature of 99±1 °С) and under pressure (cooking in a pressure cooker at a temperature of 120±1 °С) were established in the relationship "achieving the readiness of legumes – the content of dry substances in aquafaba". The use of the above-mentioned techniques for hydrothermal processing of leguminous grains make it possible to obtain the content of dry substances in aquafaba in the range of 2.8–4.8 % for cooking by the main technique and 3.9–7.0 % under pressure cooking conditions. To understand the processes regarding the influence of hydrothermal processing of legume grains on the accumulation of dry substances, the Peleg model was used. The experimental data could be used to substantiate parameters for the technological process to produce foods based on legumes
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