FIELD: food industry.SUBSTANCE: invention relates to polysaccharides rich composition containing beta-glucan, chitin and chitosan, extracted from Saccharomyces cerevisiae cell wall from biomass, which is brewing process by-product. A method for preparing the composition involves the following stages: reactor preparation with NaOH solution with concentration from 0.25 to 3 M while stirring and temperature from 50 to 95 °C, addition biomass produced during brewing to said solution, maintenance of said conditions for at least 1 hour. Then, said solution is cooled down to room temperature, solution neutralization by at least single adding of acidic solution or water until pH 7. At that, in case of more than single adding stage of solid product separation from said solution is carried out between additions. Then solid product transfer to at least single washing with water is carried out and separation of obtained solid product, solid product drying to constant mass and fine grinding. Obtained composition can be prepared in form of edible, pharmaceutical or veterinary product.EFFECT: invention enables to obtain composition, which is capable of selective fats binding, and therefore it can be used for preventing and/or treating diseases, such as overweight, obesity, hypercholesterolemia, hypertriglyceridemia, hypertension and cardiovascular disorders.13 cl, 5 dwg, 18 tbl, 9 exИзобретение относится к богатой полисахаридами композиции, содержащей бета-глюкан, хитин и хитозан, извлеченные из клеточной стенки Saccharomyces cerevisiae из биомассы, представляющей собой побочный продукт процесса пивоварения. Способ получения композиции включает следующие стадии: подготовку реактора с помощью раствора NaOH с концентрацией от 0,25 до 3 М при перемешивании и температуре от 50 до 95°С, добавление к указанному раствору биомассы, полученной в процессе пивоварения, поддержание указанных условий в течение по меньшей мере 1 часа. Далее проводят охлаждение указанного раствора до комнатной
