Moisture, xylanase production

Fig. 8 Evolution of moisture content during xylanase production in the multi-layer-packed bed reactor in active aeration conditions, bed loading of 50 g of soya oil cake. The ratio values ate averages based on addition of the moisture content from the four layers, and the experiment was performed in triplicate. The deviation standard was below 8% in all cases. Passive aeration feature), ambient air 0.1 I min (open triangle), moistened air 0.1 l/min (closed triangle), ambient air 0.5 1/min (open square), moistened air 0.5 1/min (closed square), ambient air 1 1/min (open rhombus), moistened air 1 (closed rhombus)...

Figure L Effect of medium composition and initial pH on xylanase production by AspergUlus oryzae strains in SSF on eucalyptus pidp (T, 30°C iniHal moisture content, 83% , initial pH, 8.3, fermentation time, 4 d). Medium / (g/l) NH4NO3, 5 Corn steep liquor (50% dry weight), 2 KH2PO4, 5 NaCi, 1 M 04, / trace element solution I, fl I ml/l. Medium II (g/l) (NH4)2HP04f 4 Corn steep liquor (50% dry weight), 2 urea, I KH2PO4, 3 NaCl, 1 M 04,1 trace dement solution I and II, I ml/l...

Figure 4. Effect of different nitrogen sources on xylanase production by Aspergillus oryzae NRRL 3485 in 5SSF on eucalyptus pulp (T, 30 C initicd moisture content, 83% , initial pH, 8.3, f meiUation time, 4 d). CSL, corn steep liquor (50% iby weight).

The time-course of xylanase productioi was studied (mi both non-optimized and optimized media at 83 % moisture contoit and initid pH of 8.3 (Fig.8). The peak in xylanase production on the optimized medium was on day 4. Through medium optimization, a 1.75-fold increase in xylanase yield was attained at a shwheat bran, 42 h was reported as fee most favorable fermentation time for fee production of mixtures of hydrolytic enzymes including xylanase (29). 

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