FIELD: food industry.
SUBSTANCE: the present innovation deals with the technology for preparing fresh onion bulbs for storage with their subsequent application in cosmic nutrition. The innovation deals with successive extracting Pythium gracile micromycete biomass with a nonpolar extragent in supracritical state with water, alkali, water, acid, water, alkali and water followed by combining the first extract with a solid one to obtain the preparation out of the biomass mentioned. Distilled water, gauze filter cloths and cigarette paper should be sterilized. Then it is necessary to prepare 70%-ethanol solution upon sterilized distilled water and 0.01%-suspension of the preparation obtained out of the biomass mentioned. Onion bulbs should be inspected, washed in running drinking water to be then kept in the suspension of the preparation obtained out of biomass at room temperature for 5 min to be dried at 35±5°C up to residual moisture content of the upper scales ranged 18-20%. Then one should remove loosely adjacent scale leaves, cut the neck, scrape the corm, treat every onion bulb with a sterilized gauze filter cloth impregnated in ethanol solution to be subjected to ultraviolet irradiation from opposite sides for 30 min/each bulb at radiation power ranged 1.5-2.5 W/cu. m. Then it is important to pack onion bulb by bulb under aseptic conditions into cigarette paper to arrange them into sterile polymeric trays to form a single layer. The innovation provides prolonged storage period of onion bulbs up to 45 d.
EFFECT: higher efficiency.
