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Turner, Anthony, Professor emeritusORCID iD iconorcid.org/0000-0002-1815-9699
Alternative names
Publications (10 of 815) Show all publications
Meng, L., Dagsgård, F., Turner, A. P. .. & Mak, W. C. (2020). Bi-functional sulphonate-coupled reduced graphene oxide as an efficient dopant for a conducting polymer with enhanced electrochemical performance. Journal of Materials Chemistry C, 8(37), 12829-12839
Open this publication in new window or tab >>Bi-functional sulphonate-coupled reduced graphene oxide as an efficient dopant for a conducting polymer with enhanced electrochemical performance
2020 (English)In: Journal of Materials Chemistry C, ISSN 2050-7526, E-ISSN 2050-7534, Vol. 8, no 37, p. 12829-12839Article in journal (Refereed) Published
Abstract [en]

The rapidly emerging field of organic bioelectronics has witnessed the wide use of conducting polymers (CPs) to fabricate advanced chemically modified electrodes (CMEs) for biosensors and biomedical devices. The electrochemical performance of the CPs in such devices is closely related to the quality and physiochemical nature of the dopants. A bi-functional graphene oxide derivative with high reduction degree and negatively-charged sulphonate functionality, i.e. sulphonate-coupled reduced graphene oxide (S-RGO), was developed and used as an efficient dopant for a CP with enhanced electrochemical performance. The S-RGO was synthesised via a facile one-pot hydrothermal reaction using 4-hydrazinobenzosulphonic acid (4-HBS) as reductant and sulphonate precursor simultaneously. The resulting S-RGO possesses high aqueous dispersion stability (more than 6 months), high electrical conductivity (1493.0 S m−1) and sulphonate functionality. Due to these specific properties, S-RGO demonstrated improved electropolymerisation efficiency for poly(3,4-ethylenedioxythiophene) (PEDOT) proving an effective dopant for the preparation of a PEDOT:S-RGO film (5 mC) with faster polymerisation time (37 s) compared to the conventional 2D dopants GO (PEDOT:GO, 129 s) and RGO (PEDOT:RGO, 66 s). The resulting PEDOT:S-RGO appeared as a homogenous film with uniformly distributed S-RGO dopant, low equivalent series resistance and low charge transfer resistance. Moreover, the electrochemical transduction performance of the PEDOT:S-RGO interface was evaluated with 4 different analytes, including ferric/ferrocyanide redox probe, dopamine, nicotinamide adenine dinucleotide and hydrogen peroxide. As a result of the synergistic effect of S-RGO and PEDOT, the PEDOT:S-RGO demonstrated enhanced electrochemical performance with respect to faster electrode kinetics (smaller ΔEp), ∼2 and ∼4 times increased current responses, and lower peak potentials compared to PEDOT:GO and PEDOT:RGO. This bi-functional S-RGO dopant combined the advantages of conventional GO and RGO to deliver sulphonate functionality and high conductivity for the preparation of advanced PEDOT interface with improved electrochemical performance, that could potentially be applied for applications in electrochemical sensors, biosensors and bioelectronic devices.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2020
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-169861 (URN)10.1039/D0TC02402C (DOI)000574416900005 ()
Note

Funding agencies: Swedish Research CouncilSwedish Research Council [VR-2015-04434]; China Scholarship CouncilChina Scholarship Council [201606910036]

Available from: 2020-09-22 Created: 2020-09-22 Last updated: 2024-01-08Bibliographically approved
Meng, L., Turner, A. P. .. & Mak, W. C. (2020). Soft and flexible material-based affinity sensors. Biotechnology Advances, 39, Article ID 107398.
Open this publication in new window or tab >>Soft and flexible material-based affinity sensors
2020 (English)In: Biotechnology Advances, ISSN 0734-9750, E-ISSN 1873-1899, Vol. 39, article id 107398Article, review/survey (Refereed) Published
Abstract [en]

Recent advances in biosensors and point-of-care (PoC) devices are poised to change and expand the delivery of diagnostics from conventional lateral-flow assays and test strips that dominate the market currently, to newly emerging wearable and implantable devices that can provide continuous monitoring. Soft and flexible materials are playing a key role in propelling these trends towards real-time and remote health monitoring. Affinity biosensors have the capability to provide for diagnosis and monitoring of cancerous, cardiovascular, infectious and genetic diseases by the detection of biomarkers using affinity interactions. This review tracks the evolution of affinity sensors from conventional lateral-flow test strips to wearable/implantable devices enabled by soft and flexible materials. Initially, we highlight conventional affinity sensors exploiting membrane and paper materials which have been so successfully applied in point-of-care tests, such as lateral-flow immunoassay strips and emerging microfluidic paper-based devices. We then turn our attention to the multifarious polymer designs that provide both the base materials for sensor designs, such as PDMS, and more advanced functionalised materials that are capable of both recognition and transduction, such as conducting and molecularly imprinted polymers. The subsequent content discusses wearable soft and flexible material-based affinity sensors, classified as flexible and skin-mountable, textile materials-based and contact lens-based affinity sensors. In the final sections, we explore the possibilities for implantable/injectable soft and flexible material-based affinity sensors, including hydrogels, microencapsulated sensors and optical fibers. This area is truly a work in progress and we trust that this review will help pull together the many technological streams that are contributing to the field.

Keywords
Affinity sensors, Point-of-care, Wearable, Implantable, Papers, Conducting polymers, Molecular imprinted polymers, Skin patches, Contact lenses, Hydrogels
National Category
Textile, Rubber and Polymeric Materials
Identifiers
urn:nbn:se:liu:diva-169862 (URN)10.1016/j.biotechadv.2019.05.004 (DOI)000521512200003 ()
Available from: 2020-09-22 Created: 2020-09-22 Last updated: 2024-01-08
Meng, L., Mak, W. C. & Turner, A. (2019). Tailoring physio-chemical properties of conducing polymer interfaces for sensing and biosensing. In: : . Paper presented at IVC-21, ICSS-17, ICN+T 2019, Nanoforum Conference, Malmö, Sweden, 1-5 July, 2019.
Open this publication in new window or tab >>Tailoring physio-chemical properties of conducing polymer interfaces for sensing and biosensing
2019 (English)Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

Conducting polymers, with unique ion/electron transfer capability, reversible doping/dedoping and controllable chemical and electrochemical properties, have received many attention as advanced interfaces in electronic and bioelectronic devices. Recent advancement is focus on fine-tailoring the conducting polymer interfaces with addition functionality and controlled morphology with enhanced performance beyond its intrinsic properties.

Here, we demonstrate the tailoring of physico-chemical properties of poly (3,4-ethylenedioxythiophene) (PEDOT) with high density carboxyl functionality and tailored nano-structure, and its application in dopamine sensing and lactate biosensing with enhanced selectivity and sensitivity.

For dopamine sensing, we developed a high-density negatively-charged carboxyl functionalized PEDOT interface using a low-cost organic acid citrate as dopant. Citrate contains a high content of carboxyl functionality and small size allowing well distribution of the citrate dopant within the PEDOT with a high surface carboxyl density upto 26 µM/cm2. The carboxyl confined PEDOT interface with nano-globular structure showed increased electrode kinetics and increased discriminationof dopamine from interferences (ascorbic acid and uric acid).

For lactate biosensing, we further developed a nano-fibrillar carboxyl PEDOT interface that can detect dihydronicotinamide adenine dinucleotide (NADH) at low potential at ~0.43 V. Based on the post-immobilisation of NAD-dependent lactate dehydrogenase via carboxyl coupling, lactate biosensor was developed with good analytical performance and low operation potential to reduce interferences.

These results demonstrated tailoring of physico-chemical properties of PEDOT interface with improved sensing performance, thus could potentially applied for next generation bioelectronic devices such as wearable and flexible sensors and biosensors.

National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-165701 (URN)
Conference
IVC-21, ICSS-17, ICN+T 2019, Nanoforum Conference, Malmö, Sweden, 1-5 July, 2019
Available from: 2020-05-13 Created: 2020-05-13 Last updated: 2024-01-08Bibliographically approved
Rezaei, B., Shoushtari, A. M., Rabiee, M., Uzun, L., Wing Cheung, M. & TURNER, A. (2018). An electrochemical immunosensor for cardiac Troponin I using electrospun carboxylated multi-walled carbon nanotube-whiskered nanofibres. Talanta: The International Journal of Pure and Applied Analytical Chemistry, 182, 178-186
Open this publication in new window or tab >>An electrochemical immunosensor for cardiac Troponin I using electrospun carboxylated multi-walled carbon nanotube-whiskered nanofibres
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2018 (English)In: Talanta: The International Journal of Pure and Applied Analytical Chemistry, ISSN 0039-9140, E-ISSN 1873-3573, Vol. 182, p. 178-186Article in journal (Refereed) Published
Abstract [en]

A sandwich-type nanostructured immunosensor based on carboxylated multi-walled carbon nanotube (CMWCNT)-embedded whiskered nanofibres (WNFs) was developed for detection of cardiac Troponin I (cTnI). WNFs were directly fabricated on glassy carbon electrodes (GCE) by removing the sacrificial component (polyethylene glycol, PEG) after electrospinning of polystyrene/CMWCNT/PEG nanocomposite nanofibres, and utilised as a transducer layer for enzyme-labeled amperometric immunoassay of cTnI. The whiskered segments of CMWCNTs were activated and utilised to immobilise anti-cTnT antibodies. It was observed that the anchored CMWCNTs within the nanofibres were suitably stabilised with excellent electrochemical repeatability. A sandwich-type immuno-complex was formed between cTnI and horseradish peroxidase-conjugated anti-cTnI (HRP-anti-cTnI). The amperometric responses of the immunosensor were studied using cyclic voltammetry (CV) through an enzymatic reaction between hydrogen peroxide and HRP conjugated to the secondary antibody. The nanostructured immunosensor delivered a wide detection range for cTnI from the clinical borderline for a normal person (0.5-2 ng mL(-1)) to the concentration present in myocardial infarction patients (amp;gt; 20 ng mL(-1)), with a detection limit of similar to 0.04 ng mL(-1). It also showed good reproducibility and repeatability for three different cTnI concentration (1, 10 and 25 ng mL(-1)) with satisfactory relative standard deviations (RSD). Hence, the proposed nanostructured immunosensor shows potential for point-of-care testing.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Immunosensor; Cardiac Troponin I; Carbon nanotubes; Electrospinning; Whiskered nanofibres
National Category
Analytical Chemistry
Identifiers
urn:nbn:se:liu:diva-147365 (URN)10.1016/j.talanta.2018.01.046 (DOI)000428229200021 ()29501138 (PubMedID)2-s2.0-85042645620 (Scopus ID)
Note

Funding Agencies|Ministry of Science, Research and Technology of Iran; European Commission [PIEF-GA-2013.629251]

Available from: 2018-05-18 Created: 2018-05-18 Last updated: 2018-06-28Bibliographically approved
Liu, Y., Turner, A., Zhao, M. & Wing Cheung, M. (2018). Facile synthesis of highly processable and water dispersible polypyrrole and poly(3,4-ethylenedioxythiophene) microspheres for enhanced supercapacitive performance. European Polymer Journal, 99, 332-339
Open this publication in new window or tab >>Facile synthesis of highly processable and water dispersible polypyrrole and poly(3,4-ethylenedioxythiophene) microspheres for enhanced supercapacitive performance
2018 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 99, p. 332-339Article in journal (Refereed) Published
Abstract [en]

Much recent work has focused on improving the processibility and electrocapacitive performance of conducting polymer-based materials for energy related applications. The key mechanism of conducting polymers as supercapacitor materials is driven by the rapid charging and discharging processes that involve mass transport of the counter ions insertion/ejection within the polymer structure, where ion diffusion is usually the limiting step on the efficiency of the conducting polymer capacitor. Here, we report a facile method for the green fabrication of polypyrrole microspheres (PPy-MSs) and poly (3, 4-ethylenedioxythiophene) microspheres (PEDOT-MSs) with good processability, intact morphology and large active surface for enhanced ion interchange processes, without using surfactant and highly irritant or toxic organic solvents during the synthetic process. The structure and morphology of the PPy-MSs and PEDOT-MSs were characterized by means of SEM, EDX, TEM and FTIR. Both PPy-MSs and PEDOT-MSs showed intact microsphere structures with greatly improved water dispersity and processability. More importantly, facilated by the large active surface and inter-microsphere space for ions diffusion, both the PPy-MSs and PEDOT-MSs showed a signiciantly enhanced electrical capacitive performance of 242 F g(-1) and 91.2 F g(-1), repsectively (i.e. 10 and 1.51 times in specific capacitance than the randomly structured PPy and PEDOT). This innovative approach not only addresses fundamental issues in fabrication of high performance processable microstructured conducting polymers, but also makes progress in delivering water processable conducting polymers that could be potentially used for fabrication of printed electronic devices.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2018
Keywords
Energy materials; Conducting polymers; Microspheres interface; Colloidal chemistry
National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-147165 (URN)10.1016/j.eurpolymj.2017.12.013 (DOI)000427338100034 ()
Note

Funding Agencies|China Scholarship Council (CSC) [201406910068]; Swedish Re-search Council [VR-2015-04434]

Available from: 2018-04-12 Created: 2018-04-12 Last updated: 2018-05-18
Santangelo, M. F., Libertino, S., Turner, A., Filippini, D. & Mak, W. C. (2018). High sensitive ATP bioluminescence detection based on SiPM and 3D printing technology. In: : . Paper presented at Fourth National Conference on Sensors, Catania, Italy, 21-23 February, 2018.
Open this publication in new window or tab >>High sensitive ATP bioluminescence detection based on SiPM and 3D printing technology
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2018 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

Two arrangements of the experimental setup were developed by using two different sample holders: glass cuvettes and 3D printed fluidic chips. In the 3D chip configuration, using two programmable syringe pumps, several ATP concentrations were measured in continuous-flow mode by simply changing the flow-rate ratio of the reactants (ATP and standard reaction solution).

National Category
Analytical Chemistry
Identifiers
urn:nbn:se:liu:diva-165704 (URN)
Conference
Fourth National Conference on Sensors, Catania, Italy, 21-23 February, 2018
Available from: 2020-05-13 Created: 2020-05-13 Last updated: 2020-06-01Bibliographically approved
Santangelo, M. F., Libertino, S., Turner, A., Filippini, D. & Mak, W. C. (2018). Highly sensitive silicon photomultipliers for ATP bioluminescence detection on 3D printe lab-on-a-chip. In: : . Paper presented at The 13th World Congress on Biosensors, Miami, USA, 12-15 June, 2018.
Open this publication in new window or tab >>Highly sensitive silicon photomultipliers for ATP bioluminescence detection on 3D printe lab-on-a-chip
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2018 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

Adenosine triphosphate (ATP) bioluminescence has been widely used for biosensing applications. Commercially available platforms to perform biological testing are expensive, bulky, and require substantial amounts of reactants. Here, we report design, fabrication and testing of low cost 3D printed microfluidic chips coupled with silicon photomultipliers (SiPMs) for high sensitive real-time ATP detection. Bioluminescence current increases with increasing ATP concentration in the monitored range. The system is very sensitive to ATP concentration changes regulated by the flow rate. It exhibits a sensitivity of 1.82·10-2 A/M and a LoD of 8 nM. Static and dynamic performance of the SiPM for ATP bioluminescence detection were evaluated by measuring different ATP concentrations. They were carried out coupling SiPM with a glass cuvette and a 3D-chip as sample holders, respectively. Using 3D-chip and two programmable syringe pumps, several ATP concentrations could be measured in continuous-flow mode by simply changing the flow-rate ratio of the reactants (ATP and standard reaction solution). The ability of the SiPM to detect the weak bioluminescence signals emitted by low ATP concentration. To demonstrate the sensitivity and the improved performance of this SiPM-based system, same ATP concentrations were measured and compared with a commercial reader (PerkinElmer Victor 2030). The calibration curve comparison, demonstrates as all systems compared exhibit similar sensitivities within the experimental errors. The combination of SiPM with 3D-chips provides a means of creating compact, sensitive and low-cost bioluminescence systems with wide-ranging applications in chemical and biological analysis. The continuous-flow analysis, combined with the compactness of the system, may allow its positioning directly inside environmental chambers, thus facilitating sample study in real time during growth.

National Category
Analytical Chemistry
Identifiers
urn:nbn:se:liu:diva-165706 (URN)
Conference
The 13th World Congress on Biosensors, Miami, USA, 12-15 June, 2018
Available from: 2020-05-13 Created: 2020-05-13 Last updated: 2020-06-01Bibliographically approved
Rezaei, B., Shoushtari, A. M., Rabiee, M., Uzun, L., Turner, A. & Mak, W. C. (2018). Multifactorial modeling and optimization of solution and electrospinning parameters to generate superfine polystyrene nanofibers. Advances in Polymer Technology, 37(8), 2743-2755
Open this publication in new window or tab >>Multifactorial modeling and optimization of solution and electrospinning parameters to generate superfine polystyrene nanofibers
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2018 (English)In: Advances in Polymer Technology, ISSN 0730-6679, E-ISSN 1098-2329, Vol. 37, no 8, p. 2743-2755Article in journal (Refereed) Published
Abstract [en]

This study was conducted to provide a quantitative understanding of the influence of the different solution and electrospinning variables on the morphology and the mean diameter of electrospun polystyrene nanofibers. In this regard, the effect of different solvents and ionic additives on the electrical conductivity, viscosity, and surface tension of the electrospinning solutions and thereby the morphology of nanofibers were examined. The results indicated that the morphology of the fibers is extremely dependent on the solvent’s properties, especially volatility and electrical conductivity, and the ionic characteristics of additives. Finally, to estimate the optimal electrospinning conditions for production of nanofibers with minimum possible diameter, modeling of the process was undertaken using the response surface methodology. Experimentally, nanofibers with the finest diameter of 169 ï¿œ 21 nm were obtained under the optimized conditions, and these could be considered promising candidates for a wide practical range of applications ranging from biosensors to filtration.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018
Keywords
electrospinning process, fibers, ionic additives, modeling, polystyrene
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-151893 (URN)10.1002/adv.21947 (DOI)000457486100004 ()2-s2.0-85041921459 (Scopus ID)
Note

Funding agencies: Ministry of Science, Research and Technology of Iran

Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2019-03-08Bibliographically approved
Meng, L., Turner, A. & Mak, W. C. (2018). Positively-charged hierarchical PEDOT interface with enhanced electrode kinetics for NADH-based biosensors. Biosensors & bioelectronics, 120, 115-121
Open this publication in new window or tab >>Positively-charged hierarchical PEDOT interface with enhanced electrode kinetics for NADH-based biosensors
2018 (English)In: Biosensors & bioelectronics, ISSN 0956-5663, E-ISSN 1873-4235, Vol. 120, p. 115-121Article in journal (Refereed) Published
Abstract [en]

Poly(ethylenedioxythiophene) (PEDOT) has attracted considerable attention as an advanced electrode material for electrochemical sensors and biosensors, due to its unique electrical and physicochemical properties. Here, we demonstrate the facile preparation of a positively-charged and hierarchical micro-structured PEDOT electrochemical interface with enhanced electrode kinetics for the electrooxidation of NADH. Processable PEDOT colloidal microparticles (PEDOT CMs) were synthesised by template-assisted polymerisation and were then utilised as building blocks for the fabrication of hierarchically-structured electrodes with a larger accessible electroactive surface (2.8 times larger than that of the benchmark PEDOT:PSS) and inter-particle space, thus improving electrode kinetics. The intrinsic positive charge of the PEDOT CMs further facilitated the detection of negatively-charged molecules by electrostatic accumulation. Due to the synergistic effect, these hierarchically-structured PEDOT CMs electrodes exhibited improved NADH electrooxidation at lower potentials and enhanced electrocatalytic activity compared to the compact structure of conventional PEDOT:PSS electrodes. The PEDOT CMs electrodes detected NADH over the range of 20–240 μM, with a sensitivity of 0.0156 μA/μM and a limit of detection of 5.3 μM. Moreover, the PEDOT CMs electrode exhibited a larger peak separation from the interferent ascorbic acid, and improved stability. This enhanced analytical performance for NADH provides a sound basis for further work coupling to a range of NAD-dependent dehydrogenases for applications in biosensing, bio-fuel cells and biocatalysis.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Processable, PEDOT, Hierarchical structure, Surface charge, NADH sensing
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-151892 (URN)10.1016/j.bios.2018.08.017 (DOI)000446288900016 ()30173009 (PubMedID)2-s2.0-85052522458 (Scopus ID)
Note

Funding agencies: Swedish Research Council [VR-2015-04434, VR-2014-43058]; China Scholarship Council [201606910036]

Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2024-01-08Bibliographically approved
Meng, L., Turner, A. & Mak, W. C. (2018). Processable and anti-NAD+ fouling colloidal PEDOT microparticles based hierarchical structured interface with enhanced electrode kinetics for sensitive NADH biosensing. In: : . Paper presented at The 13th World Congress on Biosensors, Miami, USA, 12-15 June, 2018.
Open this publication in new window or tab >>Processable and anti-NAD+ fouling colloidal PEDOT microparticles based hierarchical structured interface with enhanced electrode kinetics for sensitive NADH biosensing
2018 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

Conducting polymers have attracted considerable attention as potential electrode materials in electrochemical sensors and biosensors. While conducting polymers possess unique electrical and physicochemical properties, they suffer from the drawback of poor processability because of interchain interactions. Here, we introduce the concept of aqueous processable poly(ethylenedioxythiophene) microparticles (PEDOT-MPs) in colloidal dispersion synthesized by CaCO3 template-assisted method. The processable PEDOT-MPs was utilised as building blocks for the fabrication of electrodes with hierarchically-structured interfaces. Compared to commercial PEDOT:PSS electrodes, which have a dense film, the electrodes prepared with the colloidal PEDOT-MPs possess a hierarchically-structured film, which provides a larger accessible active surface and inter-particle space facilitates molecular diffusion. Taking NADH as a model analyte, such novel PEDOT-MPs electrodes detect NADH at a lower operation potential and with enhanced electrocatalytic activity (oxidation peak 1.7 times higher) compared to the commercial PEDOT:PSS electrode. The calculated diffusion coefficient of the hierarchically-structured PEDOT-MPs electrode was 1.61 x 10-6 cm2 s-1, which is ~4 times higher than that of the dense PEDOT:PSS electrode (3.98 x10-7 cm2 s-1). The PEDOT-MPs electrodes detected NADH over the range from 20 to 240 uM, with a sensitivity of 15.61 uA/mM and a limit of detection of 5.3 uM. Moreover, the hierarchically-structured PEDOT-MPs electrode exhibited improved stability (1.3 times higher over 10 measuring cycles) compared to the commercial PEDOT:PSS due to reduced fouling by the oxidised products (NAD+ and dimer), which can be ascribed to the positive surface charges (21.3 ± 4.27 mV) of the PEDOT-MPs. This colloidal PEDOT-MPs show good processability for facile preparation of electrodes, and micro-structured morphology to enhance the analytical performance for NADH biosensing, as well as reduced of NAD+ and dimer fouling. Our developed PEDOT-MPs hierarchically-structured electrodes could potentially coupled with NAD-dependent dehydrogenase enzymes for the development of wide range of biosensors.

National Category
Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-165705 (URN)
Conference
The 13th World Congress on Biosensors, Miami, USA, 12-15 June, 2018
Available from: 2020-05-13 Created: 2020-05-13 Last updated: 2024-01-08Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1815-9699

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