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Title: Low cost single-step purification of endoglucanase from Aspergillus fumigatus ABK-9
Authors: Das, Arpan
Paul, Tanmay
Halder, Suman K
Jana, Arijit
Ghosh, Kuntal
Maity, Chiranjit
Keywords: Adsorbing column;Aspergillus fumigatus;Gel electrophoresis;Langmuir adsorption isotherm;Single-step purification;Zymogram
Issue Date: Nov-2013
Publisher: NISCAIR-CSIR, India
Abstract: Low cost agro-waste was used as adsorption support for single-step purification of endoglucanase from the culture filtrate of A. fumigatus ABK-9. Among various agro-waste substrates, 1% NaOH pretreated rice bran was proved to be the best for adsorbing about 74.8 and 71.1% of endoglucanase at 4 °C and 10 °C respectively. Langmuir type adsorption isotherm at 4 °C showed maximum adsorption of enzyme at pH 5.0, which was in the range of optimum pH of the enzyme. The rice bran column bound enzyme was maximally eluted by a mixture of acetate buffer (0.05 M, pH 5.5) and ethanol (40%, v/v) at a ratio of 3:2 and a flow rate of 1 mL/min. A 5.52-fold purification of the enzyme was achieved from culture supernatant. The specific activity and recovery yield after purification were 294.0 U/mg and 40.15%, respectively, which were comparable with other contemporary protocols. The homogeneity of the enzyme was tested through sodium dodecyl sulphate polyacrylamide gel electrophoresis and a single band of 56.3 kDa was observed. Zymogram analysis finally confirmed the occurrence of endoglucanase in the single band.
Page(s): 954-959
ISSN: 0975-1009 (Online); 0019-5189 (Print)
Appears in Collections:IJEB Vol.51(11) [November 2013]

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