Solid state fermentation (SSF) is a technology which is used for cultivation and production of micro-organisms onto a solid surface in presence of very less or no free water. The solid substrate used in SSF resembles the natural habitat of some of the microbes. The substrate which are used in this technology are mostly of two types, one is nutritional substrate and other is inert material. In case of natural substrates, the substrate itself provides the required nutrients for growth and development of the microbes. Commonly used substrate are cereal husk, oil cakes, residual biomass generated in agriculture sector, etc. Inert materials are the one which provides supports for the microbial adherence on its surface. The inert materials have to be provided with additional source of nutrients.some of the commonly used inert materials are silica, hydrated magnesium silicate salts like Talc, Polyurathrane foam, etc.
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