FIELD: preparing of fresh bulb onion for storage and further usage in space feeding.
SUBSTANCE: method involves sequentially extracting biomass of Mortierella minutissima micromycet using non-polar extractant in above-critical state, water, alkali, water, acid, water, alkali, and water; joining first extract with solid residue for producing of preparation from said biomass; sterilizing distilled water, gauze wads and smoking paper; preparing 70%-ethyl alcohol solution and 0.005%-suspension of biomass preparation, using sterilized distilled water as base; inspecting bulb onion; wiping each bulb with sterilized gauze wad soaked in ethyl alcohol solution; removing non-tightly adhering covering scale; holding in biomass preparation suspension during 5 min; cutting-off neck part; cleaning base; washing with ethyl alcohol solution with neck portion being oriented downward; drying at temperature of 35±5 C until residual moisture content of upper scale is 18-20%; wiping each bulb with sterilized wad soaked in ethyl alcohol solution; exposing each side of bulb to ultraviolet radiation during 30 min at radiation intensity of 1.5-2.5 W/m3; packaging each bulb under aseptic conditions in smoking paper and placing in single layer within sterilized polymer trays. Method allows bulb onion shelf life to be increased up to 45 days at storage temperature of 25±2 C.
EFFECT: prolonged shelf life of bulb onion.
