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xylanase activity
The effects of enzymatic preparations of fungal and bacterial origins were examined, and the optimal conditions for xylanase activity were determined.
      
XYL II exhibited maximum specific xylanase activity (190 U/mg).
      
Xylanase activity of these preparations was lower than that of preparations 3.130.2 and TG20X.
      
On the cellulose medium, the maximum filter paper activity attained was 0.15 IU/mL in 7 d whereas the endoglycanase activity of 1.0 IU/mL, xylanase activity of 1.55 IU/mL, and Β-glucosidase activity of 0.57 IU/mL were acheived after 9 d fermentation.
      
This β-xylanase activity represents the highest reported for a wild-type strain ofA.
      
Aspergillus tamarii has been found to grow well and to produce high cellulase-free xylanase activity when growing on corn cob powder as the principal substrate.
      
Zymogram analysis for detection of xylanase activity after electrophoresis in polyacrylamide gels has shown thatA.
      
In repeated batch cultivation, immobilized cells produced an appreciable level of xylanase activity in seven consecutive batches without any significant decline in productivity.
      
Separation on Sephadex G-50 isolated three fractions with xylanase activity with distinct molecular weights.
      
The maximum xylanase activity is obtained after 7?days of fermentation and attains 10,200?U/g of soya oil cake.
      
Significant xylanase activity in enzyme cocktails appears to be required for improving hydrolysis of both glucan and xylan fractions of ammonia pretreated sugar cane bagasse.
      
Xylanase activity expressed by the recombinant organism was detected in the cytoplasm, periplasm and the extracellular medium.
      
Optimum pH for cellulase and galactomannase activities was 4.5 and for xylanase activity 4.5-5.5.
      
The eluted fractions II and V showed xylanase activity, fraction IV - cellulase activity and fraction III - xylanase and cellulase activity.
      
Nine commercial enzyme preparations and two laboratory-designed mixes with amylase and/or pentosanase/xylanase activity were used to prepare bread samples, and the effects on bread quality and keeping properties were determined.
      
Xylanase activity was 2-3?times higher than that of 1,3/1,4-β-D-glucanase in all the moldy brans.
      
Studies on the extracellular xylanase activity of some thermophilic actinomycetes
      
The xylanase activity in culture supernatants of strains representing Saccharomonospora viridis and three Thermomonospora spp.
      
In all four species, xylanase activity was optimal within the temperature range 60-75°C and between pH 5 and pH 8.
      
A xylanase gene from Clostridium acetobutylicum P262 was cloned on a recombinant plasmid pHZ300 which enabled Escherichia coli HB101 cells to produce intracellular xylanase activity.
      
 

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