Liquid preparation containing living microorganisms, process for preparing it, pelleted product containing living microorganisms and process for preparing it

摘要

The microorganisms in the preparation are suspended in a liquid oil phase, and the preparation can be stored at room temperature for two years or more without considerable numbers of the microorganisms having died if the microorganisms suspended in the oil phase are enveloped in at least one protective layer which is insoluble in the oil phase and is soluble or swells in water. The protective layer should preferably be solid at room temperature and not degradable by the microorganisms. The preparations are produced by mixing the microorganisms, which have been removed from the culture medium, with an aqueous medium which contains a solution or dispersion of a material of the protective layer which is soluble or swells in water, drying this mixture at least until the material of the protective layer is solid, but preferably completely drying it, and then introducing the dried enveloped microorganisms into the oil phase. The dried microorganisms enveloped in the protective layer can also be mixed with inert solid products and pelleted under pressure at elevated temperatures. These pellets can also be stored at room temperature for several years with retention of the viability of the microorganisms.