Abstract
Commercial laccase formulation was immobilized on modified green coconut fiber silanized with 3-glycidoxypropyltrimethoxysilane, aiming to achieve a cheap and effective biocatalyst. Two different strategies were followed: one point (pH 7.0) and multipoint (pH 10.0) covalent attachment. The influence of immobilization time on enzymatic activity and the final reduction with sodium borohydride were evaluated. The highest activities were achieved after 2 h of contact time in all situations. Commercial laccase immobilized at pH 7.0 was found to have higher activity and higher affinity to the substrate. However, the immobilization by multipoint covalent attachment improved the biocatalyst thermal stability at 50 °C, when compared to soluble enzyme and to the immobilized enzyme at pH 7.0. The Schiff’s bases reduction by sodium borohydride, in spite of causing a decrease in enzyme activity, showed to contribute to the increase of operational stability through bonds stabilization. Finally, these immobilized enzymes showed high efficiency in the continuous decolourization of reactive textile dyes. In the first cycle, the decolourization is mainly due to dyes adsorption on the support. However, when working in successive cycles, the adsorption capacity of the support decreases (saturation) and the enzymatic action increases, indicating the applicability of this biocatalyst for textile wastewater treatment.
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Abbreviations
- GPTMS:
-
3-glycidoxypropyltrimethoxysilane
- RB5:
-
Reactive black 5
- RB114:
-
Reactive blue 114
- RY15:
-
Reactive yellow 15
- RY176:
-
Reactive yellow 176
- RR239:
-
Reactive red 239
- RR180:
-
Reactive red 180
- ABTS:
-
2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) diammonium salt
- E :
-
Enzymatic state 0
- E 1 :
-
Enzymatic state 1
- k :
-
Thermal inactivation parameter
- A :
-
Residual enzyme activity
- α:
-
Ratio of specific activity
- t :
-
Time
- t 1/2 :
-
Half-life time
- F :
-
Stabilization factor
- v :
-
Reaction velocity
- v max :
-
Maximum velocity
- K M :
-
Michaelis–Menten constant
- [S]:
-
ABTS concentration
- A i :
-
Initial absorbance
- A f :
-
Final absorbance
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Acknowledgments
Financial support for this work was in part provided by the project FCT/CAPES/(CAPES 4.1.3/CAPES/CPLP) and by project PEst-C/EQB/LA0020/2011, financed by FEDER through COMPETE—Programa Operacional Factores de Competitividade and by FCT—Fundação para a Ciência e a Tecnologia, Portugal, for which the authors are thankful. The authors also wish to thank Novozymes (Denmark) for laccase from Aspergillus and DyStar (Porto, Portugal) for reactive dyes. S. Silvério thanks FCT for the Ph.D Scholarship (SFRH/BD/43439/2008), M. A. Z. Coelho thanks CNPq and FAPERJ (Brazil) and A. P. M. Tavares acknowledge the financial support (Programme Ciência 2008).
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Cristóvão, R.O., Silvério, S.C., Tavares, A.P.M. et al. Green coconut fiber: a novel carrier for the immobilization of commercial laccase by covalent attachment for textile dyes decolourization. World J Microbiol Biotechnol 28, 2827–2838 (2012). https://doi.org/10.1007/s11274-012-1092-4
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DOI: https://doi.org/10.1007/s11274-012-1092-4