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- W2293871477 abstract "Alkali tolerant fungus Aspergillus fischeri Fxn 1 secretes two xylanases,an exoxylanase (XylA) and an endoxylanase (XylB) in solid state fermentation.Kinetic studies showed that thermal inactivation of purified XylAand XylB at pH 9, in the temperature ranging from 303K to 333K,followed first-order kinetics, with denaturation rate constants as9.6 10-3 and 8.2 10-3 at 323K for XylA & XylB respectively. Heat-inactivationplots for purified enzymes were linear from whichthermodynamic activation parameters, ΔH#, ΔS# and ΔG# have beenestimated. The enzymatic activity was relatively stable with a respectivehalf-life (t1/2) at 323K of 72 min for XylA and 84.5 min for XylB. The halflife values of XylA & XylB increased to 169 and 136 min respectively, inthe presence of 1 M trehalose. Separate tests at 60C in the presence ofadditives (polyols, carbohydrates) showed that trehalose was the mosteffective stabiliser, which increased the stability of XylA & XylB to 64.7 &17.63 % respectively." @default.
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- W2293871477 date "2005-07-19" @default.
- W2293871477 modified "2023-09-24" @default.
- W2293871477 title "Thermal inactivation of alkali stable xylanases (XylA & XylB) from alkali tolerant fungus Aspergillus fischeri Fxn 1: effect of trehalose on their thermostability" @default.
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