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Hadded A, Massoudi J, Dhahri E, Khirouni K, Costa BFO. Structural, optical and dielectric properties of Cu 1.5Mn 1.5O 4 spinel nanoparticles. RSC Adv 2020; 10:42542-42556. [PMID: 35516749 PMCID: PMC9057967 DOI: 10.1039/d0ra08405k] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 11/04/2020] [Indexed: 11/21/2022] Open
Abstract
In this study, a Cu1.5Mn1.5O4 spinel was successfully synthesized by a sol–gel method at 500 °C for 5 h and characterized by different techniques. X-ray diffraction (XRD), Fourier transformation infrared (FTIR) spectroscopy and Raman spectroscopic analyses confirmed the formation of a spinel cubic structure with the Fd3̄m space group. The SEM proves that the grain size of our compound is of the order of 48 nm. Crystallite sizes determined from three estimates are closer to the grain size obtained from the SEM, indicating the single domain nature of the sample. The optical properties of UV-visible spectroscopy for our sample showed that the gap value is equal to 3.82 eV, making our compound a good candidate for optoelectronic applications. For electrical properties, impedance spectroscopy was performed at a frequency range of 40 ≤ frequency ≤ 106 Hz. This suggested hoping conduction due to three theoretical models. The latter can be attributed to the correlated barrier hopping (CBH) model in region I, overlapping large polaron tunneling (OLPT) in region II and non-overlapping small polaron tunneling (NSPT) mechanism in region III. One dielectric relaxation is detected from the dielectric impedance and modulus, attributed to grain contributions. This behavior was confirmed by both Nyquist and Argand's plots of dielectric impedance at different measuring temperatures. In this study, a Cu1.5Mn1.5O4 spinel was successfully synthesized by a sol–gel method at 500 °C for 5 h and characterized by different techniques.![]()
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Affiliation(s)
- Abir Hadded
- Laboratory of Applied Physics, Faculty of Sciences, University of Sfax B. P. 1171 Sfax 3000 Tunisia
| | - Jalel Massoudi
- Laboratory of Applied Physics, Faculty of Sciences, University of Sfax B. P. 1171 Sfax 3000 Tunisia
| | - Essebti Dhahri
- Laboratory of Applied Physics, Faculty of Sciences, University of Sfax B. P. 1171 Sfax 3000 Tunisia
| | - Kamel Khirouni
- Laboratory of Physics of Materials and Nanomaterials Applied to the Environment, Faculty of Sciences of Gabes Cité Erriadh, University of Gabès 6079 Gabès Tunisia
| | - B F O Costa
- University of Coimbra, CFisUC, Physics Department P-3004-516 Coimbra Portugal
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2
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Mohammadyari M, Mozaffari Z, Zarif BR. Study of synergistic effect of copper and silver nanoparticles with 10% benzalkonium chloride on Pseudomonas aeruginosa. GENE REPORTS 2020. [DOI: 10.1016/j.genrep.2020.100743] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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3
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Fabrication of the Ni/ZnO/BiOI foam for the improved electrochemical biosensing performance to glucose. Anal Chim Acta 2020; 1095:93-98. [PMID: 31864634 DOI: 10.1016/j.aca.2019.10.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 10/15/2019] [Accepted: 10/16/2019] [Indexed: 12/23/2022]
Abstract
The Ni foam decorated with ZnO/BiOI core-shell p-n junction nanorods was prepared and employed as an enzyme loading matrix to detect glucose. The detection potential was decreased significantly (0.3 V) and the sensitivity was enhanced largely (115.2 μA mM-1 cm-2). The metal-semiconductor foam can afford the porous surface for loading enzymes and achieving the multiple catalysis. More important, the built-in electric field and electron well in the p-n junction interface provide the driving force for electron transport. It was an effective strategy to enhance the biosensing performance by the rational design of p-n junction.
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Bagal-Kestwal DR, Chiang BH. Exploration of Chitinous Scaffold-Based Interfaces for Glucose Sensing Assemblies. Polymers (Basel) 2019; 11:E1958. [PMID: 31795230 PMCID: PMC6960682 DOI: 10.3390/polym11121958] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 11/18/2019] [Accepted: 11/22/2019] [Indexed: 01/09/2023] Open
Abstract
: The nanomaterial-integrated chitinous polymers have promoted the technological advancements in personal health care apparatus, particularly for enzyme-based devices like the glucometer. Chitin and chitosan, being natural biopolymers, have attracted great attention in the field of biocatalysts engineering. Their remarkable tunable properties have been explored for enhancing enzyme performance and biosensor advancements. Currently, incorporation of nanomaterials in chitin and chitosan-based biosensors are also widely exploited for enzyme stability and interference-free detection. Therefore, in this review, we focus on various innovative multi-faceted strategies used for the fabrication of biological assemblies using chitinous biomaterial interface. We aim to summarize the current development on chitin/chitosan and their nano-architecture scaffolds for interdisciplinary biosensor research, especially for analytes like glucose. This review article will be useful for understanding the overall multifunctional aspects and progress of chitin and chitosan-based polysaccharides in the food, biomedical, pharmaceutical, environmental, and other diverse applications.
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Affiliation(s)
- Dipali R. Bagal-Kestwal
- Institute of Food Science and Technology, National Taiwan University, No.1, Roosevelt Road, Section 4, Taipei 10617, Taiwan
| | - Been-Huang Chiang
- Institute of Food Science and Technology, National Taiwan University, No.1, Roosevelt Road, Section 4, Taipei 10617, Taiwan
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Wang X, Zhao M, Li H, Song Y, Chen S. Introducing Schottky barrier into electrochemical response: A novel adjusting strategy for designing electrochemical sensors. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.07.151] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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6
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Li P, Zhang M, Liu X, Su Z, Wei G. Electrostatic Assembly of Platinum Nanoparticles along Electrospun Polymeric Nanofibers for High Performance Electrochemical Sensors. NANOMATERIALS (BASEL, SWITZERLAND) 2017; 7:E236. [PMID: 28837079 PMCID: PMC5618347 DOI: 10.3390/nano7090236] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2017] [Revised: 08/14/2017] [Accepted: 08/15/2017] [Indexed: 12/13/2022]
Abstract
A novel polyacrylonitrile (PAN) nanofibrous membrane conjugated with platinum nanoparticles (PtNPs) was fabricated by electrospinning and electrostatic assembly techniques. In this procedure, PAN was electrospun with 3-aminopropyltriethoxysilane (APS) together as precursor materials. First, amine groups were introduced onto PAN nanofibers, and then the as-prepared negative-charged platinum nanoparticles (PtNPs) were conjugated onto the surface of the amino-modified PAN nanofibers uniformly by the electrostatic interaction-mediated assembly. The fabricated PAN-PtNPs hybrid nanofibrous membrane was further utilized to modify the glassy carbon electrodes and was used for the fabrication of a non-enzymatic amperometric sensor to detect hydrogen peroxide (H₂O₂). The electrochemical results indicated that, due to the uniform dispersion of PtNPs and the electrostatic interaction between amine groups and PtNPs, the fabricated PAN-PtNPs nanofibrous membrane-based electrochemical sensor showed excellent electrocatalytic activity toward H₂O₂, and the chronoamperometry measurements illustrated that the fabricated sensor had a high sensitivity for detecting H₂O₂. It is anticipated that the strategies used in this work will not only guide the design and fabrication of functional polymeric nanofiber-based biomaterials and nanodevices, but also extend their potential applications in energy storage, cytology, and tissue engineering.
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Affiliation(s)
- Peng Li
- Beijing Key Laboratory of Advanced Functional Polymer Composites, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Mingfa Zhang
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Xueying Liu
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Zhiqiang Su
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Gang Wei
- Faculty of Production Engineering, University of Bremen, D-28359 Bremen, Germany.
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7
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Gasparotto G, Costa JPC, Costa PI, Zaghete MA, Mazon T. Electrochemical immunosensor based on ZnO nanorods-Au nanoparticles nanohybrids for ovarian cancer antigen CA-125 detection. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 76:1240-1247. [DOI: 10.1016/j.msec.2017.02.031] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 11/30/2016] [Accepted: 02/07/2017] [Indexed: 10/20/2022]
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8
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Zhang M, Zhao X, Zhang G, Wei G, Su Z. Electrospinning design of functional nanostructures for biosensor applications. J Mater Chem B 2017; 5:1699-1711. [DOI: 10.1039/c6tb03121h] [Citation(s) in RCA: 125] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We summarize the recent advances in the electrospinning fabrication of hybrid polymer nanofibers decorated with functionalized nanoscale building blocks (NBBs) to obtain biosensors with better performances.
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Affiliation(s)
- Mingfa Zhang
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- 100029 Beijing
- China
| | - Xinne Zhao
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- 100029 Beijing
- China
| | - Guanghua Zhang
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- 100029 Beijing
- China
| | - Gang Wei
- Hybrid Materials Interfaces Group
- Faculty of Production Engineering
- University of Bremen
- D-28359 Bremen
- Germany
| | - Zhiqiang Su
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- 100029 Beijing
- China
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9
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Ahmed F, Arshi N, Dwivedi S, Koo BH, Azam A, Alsharaeh E. Low temperature growth of ZnO nanotubes for fluorescence quenching detection of DNA. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2016; 27:189. [PMID: 27844304 DOI: 10.1007/s10856-016-5805-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 10/28/2016] [Indexed: 06/06/2023]
Abstract
In this work, large-scale and single-crystalline ZnO nanotubes were fabricated by a simple technique from an aqueous solution at a low temperature of 65 °C. According to detailed morphology, structural and compositional analyses showed that the ZnO nanotubes [diameter ~200 nm (wall thickness ~50 nm); length ~1 µm] have single-crystallite with wurtzite structure. As-prepared ZnO nanotubes showed an effective fluorescence quenching for the detection of calf thymus DNA. In particular, increasing DNA concentrations (5-50 µM) into the fixed concentration of ZnO nanotubes (50 µM) progressively quenched the intrinsic fluorescence of nanotubes, which showed that the nanotubes fluorescence was efficiently quenched upon binding to DNA. At the highest ZnO-DNA molar ratios of 1:1.8, around 50.1 % of fluorescence quenching of DNA was observed. Significance of this study provides simple, cost-effective, and low temperature synthesis of ZnO nanotubes revealed better fluorescence property toward a platform of DNA sensor. ZnO nanotubes with diameter of ~200 nm (wall thickness ~50 nm) and length of about 1 µm prepared at low temperature (65 °C) showed fluorescence was efficiently quenched upon binding to DNA. In particular, around 50.1 % of DNA fluorescence quenching at the highest ZnO-DNA molar ratios of 1:1.8 was observed.
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Affiliation(s)
- Faheem Ahmed
- College of Science & General Studies, Alfaisal University, Riyadh, Saudi Arabia.
| | - Nishat Arshi
- College of Science & General Studies, Alfaisal University, Riyadh, Saudi Arabia
| | - Saurabh Dwivedi
- Department of Applied Physics, Aligarh Muslim University, Aligarh, India
| | - Bon Heun Koo
- School of Materials Science & Engineering, Changwon National University, Changwon, South Korea
| | - Ameer Azam
- Department of Applied Physics, Aligarh Muslim University, Aligarh, India
| | - Edreese Alsharaeh
- College of Science & General Studies, Alfaisal University, Riyadh, Saudi Arabia.
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10
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Tak M, Gupta V, Tomar M. A ZnO–CNT nanocomposite based electrochemical DNA biosensor for meningitis detection. RSC Adv 2016. [DOI: 10.1039/c6ra12453d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The article focuses on the synthesis of ZnO and CNTs based electrochemical DNA biosensor and its application towards meningitis DNA detection with high sensitivity as well as selectivity.
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Affiliation(s)
- Manvi Tak
- Department of Physics and Astrophysics
- University of Delhi
- Delhi 110007
- India
| | - Vinay Gupta
- Department of Physics and Astrophysics
- University of Delhi
- Delhi 110007
- India
| | - Monika Tomar
- Department of Physics
- Miranda House, University of Delhi
- Delhi 110007
- India
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11
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Tak M, Gupta V, Tomar M. A highly efficient urea detection using flower-like zinc oxide nanostructures. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 57:38-48. [PMID: 26354238 DOI: 10.1016/j.msec.2015.06.052] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Revised: 06/05/2015] [Accepted: 06/25/2015] [Indexed: 11/19/2022]
Abstract
A novel matrix based on flower-like zinc oxide nanostructures (ZnONF) has been fabricated using hydrothermal method and exploited successfully for the development of urea biosensor. Urease (Urs) is physically immobilized onto the ZnO nanostructure matrix synthesized over platinized silicon substrate. The surface morphology and crystallographic structure of the as-grown ZnONF have been characterized using a scanning electron microscope (SEM) and X-ray diffraction (XRD) techniques. The fabricated amperometric biosensor (Urs/ZnONF/Pt/Ti/Si) exhibits a linear sensing response towards urea over the concentration range 1.65 mM to 16.50mM with an enhanced sensitivity (~132 μA/mM/cm(2)) and a fast response time of 4s. The relatively low value of Michaelis-Menten constant (Km) of 0.19 mM confirms the high affinity of the immobilized urease on the nanostructured ZnONF surface towards its analyte (urea). The obtained results demonstrate that flower-like ZnO nanostructures serve as a promising matrix for the realization of efficient amperometric urea biosensor with enhanced response characteristics.
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Affiliation(s)
- Manvi Tak
- Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India
| | - Vinay Gupta
- Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India
| | - Monika Tomar
- Department of Physics, Miranda House, University of Delhi, Delhi 110007, India.
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Fu J, Pang Z, Yang J, Yang Z, Cao J, Xu Y, Huang F, Wei Q. Hydrothermal Growth of Ag-Doped ZnO Nanoparticles on Electrospun Cellulose Nanofibrous Mats for Catechol Detection. ELECTROANAL 2015. [DOI: 10.1002/elan.201400636] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Bharath G, Madhu R, Chen SM, Veeramani V, Balamurugan A, Mangalaraj D, Viswanathan C, Ponpandian N. Enzymatic electrochemical glucose biosensors by mesoporous 1D hydroxyapatite-on-2D reduced graphene oxide. J Mater Chem B 2015; 3:1360-1370. [DOI: 10.1039/c4tb01651c] [Citation(s) in RCA: 116] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A hydrothermally synthesized mesoporous 1D HAp-on-2D RGO sheets exhibiting direct electrochemistry of glucose biosensing.
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Affiliation(s)
- G. Bharath
- Department of Nanoscience and Technology
- Bharathiar University
- Coimbatore 641 046
- India
| | - Rajesh Madhu
- Department of Chemical Engineering and Biotechnology
- National Taipei University of Technology
- Taipei 10608
- Taiwan
| | - Shen-Ming Chen
- Department of Chemical Engineering and Biotechnology
- National Taipei University of Technology
- Taipei 10608
- Taiwan
| | - Vediyappan Veeramani
- Department of Chemical Engineering and Biotechnology
- National Taipei University of Technology
- Taipei 10608
- Taiwan
| | - A. Balamurugan
- Department of Nanoscience and Technology
- Bharathiar University
- Coimbatore 641 046
- India
| | - D. Mangalaraj
- Department of Nanoscience and Technology
- Bharathiar University
- Coimbatore 641 046
- India
| | - C. Viswanathan
- Department of Nanoscience and Technology
- Bharathiar University
- Coimbatore 641 046
- India
| | - N. Ponpandian
- Department of Nanoscience and Technology
- Bharathiar University
- Coimbatore 641 046
- India
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14
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Zhao M, Cai B, Ma Y, Cai H, Huang J, Pan X, He H, Ye Z. Self-assemble ZnMn2O4 hierarchical hollow microspheres into self-supporting architecture for enhanced biosensing performance. Biosens Bioelectron 2014; 61:443-7. [DOI: 10.1016/j.bios.2014.05.051] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2014] [Revised: 05/22/2014] [Accepted: 05/22/2014] [Indexed: 11/28/2022]
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15
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Ma Y, Zhao M, Cai B, Wang W, Ye Z, Huang J. 3D graphene foams decorated by CuO nanoflowers for ultrasensitive ascorbic acid detection. Biosens Bioelectron 2014; 59:384-8. [DOI: 10.1016/j.bios.2014.03.064] [Citation(s) in RCA: 135] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2014] [Revised: 03/14/2014] [Accepted: 03/31/2014] [Indexed: 01/09/2023]
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16
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Highly sensitive electrochemiluminescence biosensors for cholesterol detection based on mesoporous magnetic core–shell microspheres. Biotechnol Lett 2014; 36:1835-41. [DOI: 10.1007/s10529-014-1547-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 05/01/2014] [Indexed: 10/25/2022]
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17
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Zhao M, Cai B, Ma Y, Cai H, Huang J, Pan X, He H, Ye Z. Introducing heterojunction barriers into single kinked nanowires for the probe-free detection of proteins and intracellular recording. NANOSCALE 2014; 6:4052-4057. [PMID: 24604091 DOI: 10.1039/c3nr06159k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A nanoprobe based on a single nanowire (NW) possesses substantial potential for biological and in vivo determination. With regard to intracellular detection, minimal invasion and an adjustable detection depth have become crucial challenges. Nanoprobes with small, sharp tips, and long arms are thus desired. Here, we demonstrate a general strategy to prepare a single kinked NW heterojunction with a continuously adjustable angle, length and sharp line-type tip. It is found that heterojunction barriers introduced into kinked NWs can be used as a functional factor to interact with biomolecules and cells. The prepared kinked NW nanosensor is successfully used for the highly-sensitive probe-free detection of hemoglobin and real-time intracellular recording with minimal invasion. The sensing performance is dependent on the amount of heterojunction barriers. Integrated nanoprobes with multi-shaped structures are further designed for multi-functional applications. Introducing heterojunction barriers to kinked NWs provides a substantial opportunity for fabricating functional and integrated nanoprobes for applications in the life sciences.
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Affiliation(s)
- Minggang Zhao
- Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, PR China
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18
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Vasile BS, Oprea O, Voicu G, Ficai A, Andronescu E, Teodorescu A, Holban A. Synthesis and characterization of a novel controlled release zinc oxide/gentamicin–chitosan composite with potential applications in wounds care. Int J Pharm 2014; 463:161-9. [DOI: 10.1016/j.ijpharm.2013.11.035] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 11/03/2013] [Accepted: 11/18/2013] [Indexed: 01/03/2023]
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19
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Zhou Y, Wang L, Ye Z, Zhao M, Huang J. Synthesis of ZnO micro-pompons by soft template-directed wet chemical method and their application in electrochemical biosensors. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2013.10.150] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Low-temperature fabrication of ZnO nanorods/ferrocenyl–alkanethiol bilayer electrode and its application for enzymatic glucose detection. Biosens Bioelectron 2014; 51:362-5. [DOI: 10.1016/j.bios.2013.08.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 07/20/2013] [Accepted: 08/05/2013] [Indexed: 11/18/2022]
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21
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Zhang L, Wang Y, Wang J, Shi J, Deng K, Fu W. rhEPO/EPO discrimination with ultrasensitive electrochemical biosensor based on sandwich-type nano-Au/ZnO sol-gel/nano-Au signal amplification. Biosens Bioelectron 2013; 50:217-23. [PMID: 23867351 DOI: 10.1016/j.bios.2013.06.038] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 06/10/2013] [Accepted: 06/19/2013] [Indexed: 12/16/2022]
Abstract
This research established a non-labeled electrochemical biosensor for discrimination of recombinant human erythropoietin (rhEPO) and endogenous erythropoietin (EPO). We prepared a glassy carbon electrode (GCE) modified by a unique sandwich-like nano-Au/ZnO sol-gel/nano-Au compound membrane for signal amplification. The porous sol-gel structure facilitates protein activity maintenance and thermostability. Nano-Au is characterized by a large specific surface area, high surface activity, high absorbability, and good electro-conductivity and biocompatibility. By combining the advantages of both ZnO sol-gel and nano-Au, the amount of erythropoietin receptor (EPOR) increased substantially, and electron transfer of EPOR protein and electrode surface increased accordingly. In the present study, the effects of experimental conditions such as nano-Au electrodeposition time and nano-Au concentration were investigated by cyclic voltammetry, and the process of GCE modification was characterized electrochemically. We successfully developed a new method for electrochemical detection of trace rhEPO/EPO. More importantly, the response current change (ΔI) of the nano-Au/ZnO sol-gel/nano-Au modified GCE increases 3-fold when compared with that of the unmodified electrode and the sensor detection sensitivity increases significantly. In conclusion, this electrochemical biosensor is simple to prepare and allows fast, accurate, and specific detection of trace rhEPO in clinical monitoring and stimulant discrimination.
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Affiliation(s)
- Liqun Zhang
- Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing 400038, PR China.
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22
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Zhao M, Li Z, Han Z, Wang K, Zhou Y, Huang J, Ye Z. Synthesis of mesoporous multiwall ZnO nanotubes by replicating silk and application for enzymatic biosensor. Biosens Bioelectron 2013; 49:318-22. [PMID: 23792653 DOI: 10.1016/j.bios.2013.05.017] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Revised: 05/04/2013] [Accepted: 05/14/2013] [Indexed: 10/26/2022]
Abstract
A facial biotemplate-directed synthetic route for fabricating mesoporous multiwall ZnO nanotubes (ZnO-MMNTs) was proposed. Owing to the mesoporous multiwall based matrix, one dimensional (1D) tubes based channels and high isoelectric point (IEP), the prepared ZnO-MMNTs are wonderful platform to immobilize glucose oxidase (GOx) for glucose biosensing. Scale-adaptive cells are constructed to hold enzymes molecules, maintain enzymatic activity and keep stability. The prepared enzymatic electrode (chitosan/GOx/ZnO/Au) exhibits high sensitivity (47.2 μA mM(-1)cm(-2)), very fast response (<2s), quite low KM(app) (1.09 mM), excellent selectivity and stability. Therefore, ZnO-MMNTs are promising material for enzyme assembly and other biological applications.
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Affiliation(s)
- Minggang Zhao
- Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
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