Solid state fermentation temperature

Effect of Temperature, Moisture, and Carbon Supplementation on Lipase Production by Solid-State Fermentation of Soy Cake by Penicillium simplicissimum... 

The operating conditions for solid-state fermentation for cellulase production are dependent on the strain to be used, the reactor type and the medium composition, but the basic operating procedure remains the same as shown in Fig. 2. The final product can be obtained as crude solid cellulase, liquid cellulase or powder cellulase according to the application. Figure 3 shows a process flowsheet for cellulase production [25]. In the process, wheat bran is used as substrate. Seeds are prepared in a stirred-tank fermentor and then sprayed into the medium by a spray distributor. The fermentation is performed in a shallow-tray fermentor. The temperature and humidity in the fermentor are automatically regulated. After fermentation, cellulase is recovered by water extraction and purified by salt precipitation and ion exchange. The final product is concentrat-... 

The operating conditions are very important for efficient cellulase production via solid-state fermentation. The effects of operating conditions, such as temperature, water content and water activity, pH, aeration and substrate composition, on the cellulase production by solid-state fermentation will be discussed in this section. 

The most commonly used strain in cellulase production is the mutant from T. reesei, whose optimal temperature for growth is in the range 30-32 °C, and the optimal temperature for cellulase accumulation is 26-28 °C [2, 26]. During solid-state fermentation, a heat of metabolism will be released because of the... 

Fig. 5. A column fermentor for the monitoring of the temperature gradient in solid-state fermentation of cassaca by A.niger [28]. a Radial gradient b axial gradient. Column fermentor (volume 1 1 radius 6 cm length 35 cm) 1 jacket fermentor 2 water pump 3 humidifier 4 thermocouples 5 pressure and air flow controls 6 temperature display device 7 water bath...

Parameters to describe a solid-state fermentation process for cellulase production include physical properties such as temperature, pH, humidity and water activity, particle size, pile and real densities, pore size and porosity, etc. chemical components such as medium composition, gas-phase composition, amount and properties of microorganisms, activities of cellulases, etc. and kinetic para-... 

The present work has established the potential of a laboratory multi-layer-packed bed reactor for xylanase production in solid-state fermentation by P. canescens. Optimal production obtained is largely superior to those related in literature. Two problems are identified. Initially, the forced aeration causes sporulation of the Penicillium strain and so decreases xylanase production. In addition, increasing the cultural surface more than 100 g/layer of soya oil cake (1-cm bed height) decreases significantly xylanase production and constitutes a disadvantage for this process. To increase efficiency of the multi-layer-packed bed reactor, we can increase the dimensions of the layers. Why not associate mixing the culture medium, moistened air, and a rigorous control of the temperature at the inner the reactor Another approach would be to develop a reactor in this direction to improve the production. 

Not mentioned in the paper RT room temperature Solid state fermentation Submerged fermentation... 

Compostability is the capacity of an organic material to tnrn into compost , a hnmus-like stabilised substance. This occurs via an accelerated and controlled solid-state fermentation at high temperature. 

The sohd-state fermentation for cellulase production is an aerobic process therefore, aeration is necessary for cell growth and cellulase formation. In addition, aeration is important in order to maintain humidity, to remove gaseous metabolites, such as COj, as well as to remove the heat of metabolism [42,43]. In a large-scale solid-state fermentor, aeration is so important that it must be controlled carefully. The aeration method and the flow rate as well as the temperature and humidity of the air supply must be regulated to avoid sudden changes in temperature and water activity of the solid medium [29,31]. 

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