Many biotechnological processes lead to large amounts of microbial biomass, which are often nothing but a nuiance. This is especially true for the production of secondary metabolites like industrial enzymes and antibotics, during these aerobic processes large amounts of waste biomass are generated. There are many disposal routes but economical ones are rare. Large volumes of microbial biomass are used as fertilizers after inactivation and stabilization, this can be done directly in the liquid state as well as by composting in the presence of a solid co-substrate. However, an entire infrastructure has to be established for this purpose. Alternatively, it has to be treated as waste and decomposed in sewage plants or burnt [1,2]. Yeast extract, however, shows that the disintegration of microbial biomass may yield valuable products.
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