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Immobilization of cellulase on magnetized multiwall carbon nanotubes (m-MWCNTs) synthesized via eco-friendly (water-based) method

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Abstract

The interest in using magnetic nanoparticle (MNPs) as a carrier for immobilization is overwhelming due to high surface area and lightweight properties. However, the conventional synthesis of MNPs required use of high amount of chemicals and is a time-consuming process. Thus, in the present research, magnetized multiwall carbon nanotubes (m-MWCNTs) were successfully synthesized via water-based system using simple steps. The synthesized m-MWCNTs was used as carrier for the immobilization of cellulase. Cellulase was proven to be successfully bounded on m-MWCNTs using Fourier transform infrared spectroscopy that revealed a peak at 580.33 cm−1 indicating Fe–O stretching in parallel with observation of rougher and coarser surface of m-MWCNTs through scanning electron microscope. The total binding efficiency of cellulase to the m-MWCNTs was determined to be 95% at 5 mg/mL of the enzyme concentration. The activity of the immobilized cellulase was evaluated using carboxymethyl cellulose (CMC) as a substrate. Both of free and immobilized cellulase showed optimum working condition at 50 °C and pH 5. Furthermore, the immobilized cellulase was found to be able to retain more than 50% of its initial activity at the fifth cycle of the hydrolysis of CMC and filter paper. A similar activity was recorded with paddy straw at the third cycle of hydrolysis.

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Abbreviations

T :

Temperature °C

t:

Time h

t:

Time min

mL:

Volume

mg:

Mass

g:

Mass

U:

Enzyme unit

M:

Molarity

%:

Percentage

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Acknowledgements

This study was supported by Fundamental Research Grant Scheme (FRGS), Grant No: 9003-00530[FRGS/1/2015/SG05/UNIMAP/02/4] entitled "Identification of New Cellulolytic Bacterial Strains from Tropical Mangrove Soil from the Ministry of Higher Education Malaysia" and Universiti Tunku Abdul Rahman Research Fund: IPSR/RMC/UTARRF/2019-C2/S02.

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Correspondence to Balakrishnan Kunasundari.

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Yasmin, H.A.N., Naresh, S., Kunasundari, B. et al. Immobilization of cellulase on magnetized multiwall carbon nanotubes (m-MWCNTs) synthesized via eco-friendly (water-based) method. Chem. Pap. 76, 453–464 (2022). https://doi.org/10.1007/s11696-021-01874-7

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  • DOI: https://doi.org/10.1007/s11696-021-01874-7

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