FERMENTATION SUBSTRATES- THE PRELIMINARY CONSIDERATIONS

The raw materials used in fermentation constitute the substrates for the fermentation process. The substrates could be seen as either the raw materials that will be ultimately transformed into the desired fermentation products or they could be regarded as the source of nutrients for the fermentation microorganisms.
The substrates form the bulk of the fermentation broth and often considered as one of the most important component in the cost of the fermentation products. Thus in order to lower the costs of production the search for the most cheapest and economical source of fermentation substrate will be the top most agenda in any proposed fermentation industry.
The search for the most suitable substrate is not only dictated by costs and availability of the substrate but by other factors such as complexity of unwanted reactions that affect not only upstream, midstream but downstream activities. This would also mean the problem of treating its effluent from polluting the environment
THE RIGHT NUTRIENT COMPOSITION
In most cases the search for the right fermentation substrate or its admixture composition started with the detailed nutrient elemental analyses. Generally a single source of substrate do not have the sufficient composition to fulfill all the requirements as the fermentation substrate and a concocted admixture is often created to make it ‘wholesome’ or complete as the ideal substrate
Some of the recipes of the fermentation substrate is determined or created in the laboratory where the necessary type and concentration of media is determined as if it is a recipe. Experiments and complex chemical and elemental analyses would be carried out by using various analytical methods and its suitability by carrying out nutritional and physiological studies involving petri dish to even small fermentors
After all just having a fermentation media complete with all its composition does not always guaranteed the suitability or success for the fermentation
THE RIGHT SOURCE
The source of the fermentation substrate should be cheap economical and easily available. This is a problem usually involving high volume low cost fermentation process. Pure chemicals though idealistic would send the fermentation costs shooting to the sky! And would not be economically viable unless the fermentation product is high cost and low volume
Such source of cheap fermentation substrate for high volume low cost fermentation has only one possible source that is the unwanted cheap agricultural or industrial waste products. After all to the microbes they don’t see it as dining at expensive restaurant; a food or nutrient is just a source of nutrients or elements
It is of utmost importance that the source of waste products for fermentation is not only cheap but continually available in stable supply. Several alternative sources for contingencies must always be taken care of as good logistics procedure


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