Enzymatic grafting: A novel approach to develop multifunctional materials of interest

Iqbal, H.M.N., Kyazze, G., Keshavarz, T. and Tron, T. 2014. Enzymatic grafting: A novel approach to develop multifunctional materials of interest. 8th International Conference on Energy, Materials and Nanotechnology. Florida, USA 25 Nov 2014

TitleEnzymatic grafting: A novel approach to develop multifunctional materials of interest
AuthorsIqbal, H.M.N., Kyazze, G., Keshavarz, T. and Tron, T.
TypeConference poster
Abstract

Today more than 99% of plastics are petroleum-based because of the availability and cost of the raw material. The durability of disposed plastics contributes to the environmental problems as waste and their persistence in the environment causes deleterious effects on the ecosystem. Environmental pollution awareness and the demand for green technology have drawn considerable attention of both academia and industry into biodegradable polymers. In this regard green chemistry technology has the potential to provide solution to this issue. Enzymatic grafting has recently been the focus of green chemistry technologies due to the growing environmental concerns, legal restrictions, and increasing availability of scientific knowledge.
Over the last several years, research covering various applications of robust enzymes like laccases and lipases has been increased rapidly, particularly in the field of polymer science, to graft multi-functional materials of interest. In principle, enzyme-assisted grafting may modify/impart a variety of functionalities to the grafted composites which individual materials fail to demonstrate on their own. The modified polymers through grafting have a bright future and their development is practically boundless.
In the present study series of graft composites with poly(3-hydroxybutyrate) (P(3HB) as side chain and cellulose as a backbone polymer were successfully synthesised by introducing enzymatic grafting technique where laccase and lipase were used as model catalysts [1-3]. Subsequently, the resulting composites were removed from the casting surface under ambient environment and characterised by Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) in detail. Moreover, the thermo-mechanical behaviours of the grafted composites were investigated by differential scanning calorimetry (DSC) and dynamic mechanical analyser (DMA) measurements, respectively. In addition, hydrophobic and hydrophilic characteristics of the grafted polymers were studied through drop contour analysis using water contact angle (WCA).
In comparison to the individual counterparts improvement was observed in the thermo- mechanical properties of the composites to varied extent. The tensile strength, elongation at break, and Young’s modulus values of the composites reached their highest levels in comparison to the films prepared with pure P(3HB) only which was too fragile to measure any of the above said characteristics. Interestingly, untreated P(3HB) was hydrophobic in nature and after lipase treatment P(3HB) and P(3HB)-EC-based graft composite attained higher level of hydrophilicity. This is a desired characteristic that enhances the biocompatibility of the materials for proper cell adhesion and proliferation therefore suggesting potential candidates for tissue engineering/bio-medical type applications [3]. The present research will be a first step in the biopolymer modification. To date no report has been found in literature explaining the laccase/lipase assisted grafting of P(3HB) [1-3]. The newly grafted composites exhibit unique functionalities with wider range of potential applications in bio-plastics, pharmaceutical, and cosmetics industries, tissue engineering, and biosensors.

[1] H.M.N. Iqbal, G. Kyazze, T. Tron and T. Keshavarz, Cellulose 21, 3613-3621 (2014).
[2] H.M.N. Iqbal, G. Kyazze, T. Tron and T. Keshavarz, Carbohydrate Polymers 113, 131-137 (2014).
[3] H.M.N. Iqbal, G. Kyazze, T. Tron and T. Keshavarz, Polymer Chemistry In-Press, DOI: 10.1039/C4PY0 0857J (2014).

Year2014
Conference8th International Conference on Energy, Materials and Nanotechnology
ProjectDevelopment of bio-composites with novel characteristics through enzymatic grafting
Web address (URL) of conference proceedingshttp://www.emnfall.org/2014/wp-content/uploads/2014/02/EMN-Program-2014-Abstract-Book.pdf

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Iqbal, H.M.N., Kyazze, G., Locke, I.C., Tron, T. and Keshavarz, T. 2015. Development of bio-composites with novel characteristics: Evaluation of phenol-induced antibacterial, biocompatible and biodegradable behaviours. Carbohydrate Polymers. 131, pp. 197-207. https://doi.org/10.1016/j.carbpol.2015.05.046

In-situ development of self-defensive antibacterial biomaterials: phenol-g-keratin-EC based bio-composites with characteristics for biomedical applications
Iqbal, H.M.N., Kyazze, G., Locke, I.C., Tron, T. and Keshavarz, T. 2015. In-situ development of self-defensive antibacterial biomaterials: phenol-g-keratin-EC based bio-composites with characteristics for biomedical applications. Green Chemistry. 17 (7), pp. 3858-3869. https://doi.org/10.1039/C5GC00715A

Laccase-assisted approach to graft multifunctional materials of interest: keratin-EC based novel composites and their characterisation
Iqbal, H.M.N., Kyazze, G., Keshavarz, T. and Tron, T. 2015. Laccase-assisted approach to graft multifunctional materials of interest: keratin-EC based novel composites and their characterisation. Macromolecular Materials and Engineering. 300 (7), pp. 712-720. https://doi.org/10.1002/mame.201500003

The effect of salinity, redox mediators and temperature on anaerobic biodegradation of petroleum hydrocarbons in microbial fuel cells
Adelaja, O., Keshavarz, T. and Kyazze, G. 2015. The effect of salinity, redox mediators and temperature on anaerobic biodegradation of petroleum hydrocarbons in microbial fuel cells. Journal of Hazardous Materials. 283, pp. 211-217. https://doi.org/10.1016/j.jhazmat.2014.08.066

Inter-kingdom cross-talk and its bio-control applications
Esmaeilishirazifard, E., Moschos, S.A. and Keshavarz, T. 2014. Inter-kingdom cross-talk and its bio-control applications. International Union of Microbiological Societies Congress. Montreal, Canada 31 Jul 2014

Bio-control applications of Bacillus quorum sensing on aflatoxigenic fungi
Esmaeilishirazifard, E., Moschos, S.A. and Keshavarz, T. 2014. Bio-control applications of Bacillus quorum sensing on aflatoxigenic fungi.

Aflatoxin occurrence
Esmaeilishirazifard, E. and Keshavarz, T. 2014. Aflatoxin occurrence. in: Faulkner, A.G. (ed.) Aflatoxins: food sources, occurrence and toxicological effects New York, USA Nova Science Publishers. pp. 35-62

Synthesis and characterisation of novel keratin-cellulose based graft composites
Iqbal, H.M.N., Kyazze, G., Keshavarz, T. and Tron, T. 2014. Synthesis and characterisation of novel keratin-cellulose based graft composites. University of Westminster Faculty of Science and Technology Postgraduate Fair. University of Westminster, London, UK 29 Apr 2014

Biocatalysis for bioelectricity production. Keynote guest lecture presented at the New Horizons in Biocatalysis for Biomaterials Workshop for early career researchers holding a PhD
Kyazze, G. 2014. Biocatalysis for bioelectricity production. Keynote guest lecture presented at the New Horizons in Biocatalysis for Biomaterials Workshop for early career researchers holding a PhD. New Horizons in Biocatalysis for Biomaterials Workshop. Department of Bioengineering, Ege University, Turkey 8-12th April 2014

“One-pot” synthesis and characterisation of novel P(3HB)-ethyl cellulose based graft composites through lipase catalysed esterification
Iqbal, H.M.N., Kyazze, G., Tron, T. and Keshavarz, T. 2014. “One-pot” synthesis and characterisation of novel P(3HB)-ethyl cellulose based graft composites through lipase catalysed esterification. Polymer Chemistry. 24, pp. 7004-7012. https://doi.org/10.1039/C4PY00857J

Complete degradation of the azo dye Acid Orange-7 and bioelectricity generation in an integrated microbial fuel cell, aerobic two-stage bioreactor system in continuous flow mode at ambient temperature
Fernando, E., Keshavarz, T. and Kyazze, G. 2014. Complete degradation of the azo dye Acid Orange-7 and bioelectricity generation in an integrated microbial fuel cell, aerobic two-stage bioreactor system in continuous flow mode at ambient temperature. Bioresource Technology. 156, pp. 155-162. https://doi.org/10.1016/j.biortech.2014.01.036

Enhanced biodegradation of phenanthrene using different inoculum types in a microbial fuel cell
Adelaja, O., Keshavarz, T. and Kyazze, G. 2014. Enhanced biodegradation of phenanthrene using different inoculum types in a microbial fuel cell. Engineering in Life Sciences. 14 (2), pp. 218-228. https://doi.org/10.1002/elsc.201300089

External resistance as a potential tool for influencing azo dye reductive decolourisation kinetics in microbial fuel cells
Fernando, E., Keshavarz, T. and Kyazze, G. 2014. External resistance as a potential tool for influencing azo dye reductive decolourisation kinetics in microbial fuel cells. International Biodeterioration & Biodegradation. 89, pp. 7-14. https://doi.org/10.1016/j.ibiod.2013.12.011

Effect of hydraulic retention time on the performance of a novel tubular MFC fed with petroleum hydrocarbons
Adelaja, O., Kyazze, G. and Keshavarz, T. 2014. Effect of hydraulic retention time on the performance of a novel tubular MFC fed with petroleum hydrocarbons. New Biotechnology. 31, p. S98. https://doi.org/10.1016/j.nbt.2014.05.1845

A preliminary study on the development and characterisation of enzymatically grafted P(3HB)-ethyl cellulose based novel composites
Iqbal, H.M.N., Kyazze, G., Tron, T. and Keshavarz, T. 2014. A preliminary study on the development and characterisation of enzymatically grafted P(3HB)-ethyl cellulose based novel composites. Cellulose. 21 (5), pp. 3613-3621. https://doi.org/10.1007/s10570-014-0337-9

Laccase-assisted grafting of poly(3-hydroxybutyrate) onto the bacterial cellulose as backbone polymer: development and characterisation
Iqbal, H.M.N., Kyazze, G., Tron, T. and Keshavarz, T. 2014. Laccase-assisted grafting of poly(3-hydroxybutyrate) onto the bacterial cellulose as backbone polymer: development and characterisation. Carbohydrate Polymers. 113, pp. 131-137. https://doi.org/10.1016/j.carbpol.2014.07.003

Advances in the valorization of lignocellulosic materials by biotechnology: an overview
Iqbal, H.M.N., Kyazze, G. and Keshavarz, T. 2013. Advances in the valorization of lignocellulosic materials by biotechnology: an overview. BioResources. 8 (2), pp. 3157-3176. https://doi.org/10.15376/biores.8.2.3157-3176

Interaction between Bacillus species and filamentous fungi for the control of fungal toxin production
Esmaeilishirazifard, E., Moschos, S.A. and Keshavarz, T. 2013. Interaction between Bacillus species and filamentous fungi for the control of fungal toxin production.

Laccase-assisted bio-grafting of polyhydroxy-alkanoates (PHAs) onto the ethyl cellulose (EC) backbone
Iqbal, H.M.N., Kyazze, G., Keshavarz, T. and Tron, T. 2013. Laccase-assisted bio-grafting of polyhydroxy-alkanoates (PHAs) onto the ethyl cellulose (EC) backbone. University of Westminster Faculty of Science and Technology Postgraduate Fair. University of Westminster, London, UK 25 Apr 2013

Integration of biohydrogen, biomethane and bioelectrochemical systems
Premier, G.C., Kim, J.R., Massanet-Nicolau, S., Kyazze, G., Esteves, S., Penumathsa, B.K.V., Rodríguez, J., Maddy, J., Dinsdale, R.M. and Guwy, A.J. 2013. Integration of biohydrogen, biomethane and bioelectrochemical systems. Renewable Energy. 49, pp. 188-192. https://doi.org/10.1016/j.renene.2012.01.035

Simultaneous co-metabolic decolourisation of azo dye mixtures and bio-electricity generation under thermophillic (50°C) and saline conditions by an adapted anaerobic mixed culture in microbial fuel cells
Fernando, E., Keshavarz, T. and Kyazze, G. 2013. Simultaneous co-metabolic decolourisation of azo dye mixtures and bio-electricity generation under thermophillic (50°C) and saline conditions by an adapted anaerobic mixed culture in microbial fuel cells. Bioresource Technology. 127, pp. 1-8. https://doi.org/10.1016/j.biortech.2012.09.065

Simultaneous co-metabolic azo dye decolourisation and bio-electricity generation in microbial fuel cells
Fernando, E., Keshavarz, T. and Kyazze, G. 2012. Simultaneous co-metabolic azo dye decolourisation and bio-electricity generation in microbial fuel cells. Electron transfer at the microbe-mineral interface. University of East Anglia 02 - 04 Apr 2012 The Biochemical Society.

Phenanthrene degradation and concomitant electricity generation using a bioelectrochemical process
Adelaja, O., Keshavarz, T. and Kyazze, G. 2012. Phenanthrene degradation and concomitant electricity generation using a bioelectrochemical process . Electrochem 2012 - Electrochemical Horizons. Dublin 02 - 04 Sep 2012 Royal Society of Chemistry.

Laccase bio-grafting a versatile modification tool from green chemistry technologies
Iqbal, H.M.N., Tron, T. and Keshavarz, T. 2012. Laccase bio-grafting a versatile modification tool from green chemistry technologies. University of Westminster Faculty of Science and Technology Postgraduate Fair. University of Westminster, London, UK 26 Apr 2012

Enhanced bio-decolourisation of acid orange 7 by Shewanella oneidensis through co-metabolism in a microbial fuel cell
Fernando, E., Keshavarz, T. and Kyazze, G. 2012. Enhanced bio-decolourisation of acid orange 7 by Shewanella oneidensis through co-metabolism in a microbial fuel cell. International Biodeterioration and Biodegradation. 72, pp. 1-9. https://doi.org/10.1016/j.ibiod.2012.04.010

Influence of catholyte pH and temperature on hydrogen production from acetate using a two chamber concentric tubular microbial electrolysis cell
Kyazze, G., Popov, A., Dinsdale, R.M., Esteves, S., Hawkes, F.R., Premier, G.C. and Guwy, A.J. 2010. Influence of catholyte pH and temperature on hydrogen production from acetate using a two chamber concentric tubular microbial electrolysis cell. International Journal of Hydrogen Energy. 35 (15), pp. 7716-7722. https://doi.org/10.1016/j.ijhydene.2010.05.036

Direct fermentation of fodder maize, chicory fructans and perennial ryegrass to hydrogen using mixed microflora
Kyazze, G., Dinsdale, R.M., Hawkes, F.R., Guwy, A.J., Premier, G.C. and Donnison, I.S. 2009. Direct fermentation of fodder maize, chicory fructans and perennial ryegrass to hydrogen using mixed microflora. Bioresource Technology. 99 (18), pp. 8833-8839. https://doi.org/10.1016/j.biortech.2008.04.047

Feedstocks for BES conversions
Hawkes, F.R., Kim, J.R., Kyazze, G. and Premier, G.C. 2009. Feedstocks for BES conversions. in: Rabaey, K., Angenent, L., Schroder, U. and Keller, J. (ed.) Bioelectrochemical systems: from extracellular electron transfer to biotechnological application London IWA Publishing.

ADM1 can be applied to continuous bio-hydrogen production using a variable stoichiometry approach
Penumathsa, B.K.V., Premier, G.C., Kyazze, G., Dinsdale, R.M., Guwy, A.J., Esteves, S. and Rodríguez, J. 2008. ADM1 can be applied to continuous bio-hydrogen production using a variable stoichiometry approach. Water Research. 42 (16), pp. 4379-4385. https://doi.org/10.1016/j.watres.2008.07.030

Performance characteristics of a two stage process producing hydrogen and methane continuously
Kyazze, G. 2007. Performance characteristics of a two stage process producing hydrogen and methane continuously. Biotechnology and Bioengineering. 97 (4), pp. 759-770. https://doi.org/10.1002/bit.21297

Effect of mannan oligosaccharide elicitor and ferulic acid on enhancement of laccases production in liquid cultures of basidiomycetes
Vanhulle, S., Radman, R., Parra, R., Cui, T., Bols, C.M., Tron, T., Sannia, G. and Keshavarz, T. 2007. Effect of mannan oligosaccharide elicitor and ferulic acid on enhancement of laccases production in liquid cultures of basidiomycetes. Enzyme and Microbial Technology. 40 (7), pp. 1712-1718. https://doi.org/10.1016/j.enzmictec.2006.10.002

The potential for hydrogen-enriched biogas production from crops: scenarios in the UK
Martinez-Perez, N., Cherryman, S.J., Premier, G.C., Dinsdale, R.M., Hawkes, D.L., Hawkes, F.R., Kyazze, G. and Guwy, A.J. 2007. The potential for hydrogen-enriched biogas production from crops: scenarios in the UK. Biomass & Bioenergy. 31 (2-3), pp. 95-104. https://doi.org/10.1016/j.biombioe.2006.07.003

Continuous dark fermentative hydrogen production by mesophilic microflora: principles and progress
Hawkes, F.R., Hussy, I., Dinsdale, R.M., Hawkes, D.L. and Kyazze, G. 2007. Continuous dark fermentative hydrogen production by mesophilic microflora: principles and progress. International Journal of Hydrogen Energy. 32 (2), pp. 172-184. https://doi.org/10.1016/j.ijhydene.2006.08.014

Influence of substrate concentration on the stability and yield of continuous biohydrogen production
Kyazze, G., Martinez-Perez, N., Dinsdale, R.M., Hawkes, F.R., Hawkes, D.L. and Guwy, A.J. 2006. Influence of substrate concentration on the stability and yield of continuous biohydrogen production. Biotechnology and Bioengineering. 93 (5), pp. 971-979. https://doi.org/10.1002/bit.20802

Viscosity of milk: influence of cluster formation
Kyazze, G. and Starov, V. 2004. Viscosity of milk: influence of cluster formation. Colloid Journal. 66 (3), pp. 316-321. https://doi.org/10.1023/B:COLL.0000030842.70947.f0

Influence of cluster formation: viscosity of concentrated emulsions
Kyazze, G. and Starov, V. 2003. Influence of cluster formation: viscosity of concentrated emulsions. Applied Rheology. 13 (5), pp. 259-264. https://doi.org/10.3933/ApplRheol-13-259

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