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Hu X, Hu R, Zhu H, Chen Q, Lu Y, Chen J, Liu Y, Chen H. Nanozyme-based cascade SPR signal amplification for immunosensing of nitrated alpha-synuclein. Mikrochim Acta 2022; 189:367. [PMID: 36056240 DOI: 10.1007/s00604-022-05465-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Accepted: 08/18/2022] [Indexed: 11/30/2022]
Abstract
A self-assembled nanozyme of iron porphyrin mediated supramolecular modified gold nanoparticles (FpA) was fabricated to determine nitrated alpha-synuclein as the Tyr 39 residue (nT39 α-Syn) of a potential biomarker for early diagnosis of Parkinson's disease (PD). Mechanically, localized surface plasmon resonance (LSPR) and the mass effect caused by catalytic deposition of the nanozyme contributed to a cascade signal amplification strategy. The sensor allowed a signal amplification and selective nT39 α-Syn bioanalysis with a 1.34-fold enhancement by cascade amplified SPR signal and double specific recognition. The detection limit was 1.78 ng/mL in the detection range of 7-240 ng/mL. Benefiting from the excellent immunosensor, this method can distinguish healthy people and PD patients using actual samples. Overall, this strategy provides a nanozyme-based biosensing platform for the early diagnosis of PD and can be applied to detect other protein biomarkers, such as PD-L1.
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Affiliation(s)
- Xiaojun Hu
- School of Life Sciences, Shanghai University, Shanghai, 200444, People's Republic of China
| | - Ruhui Hu
- School of Life Sciences, Shanghai University, Shanghai, 200444, People's Republic of China
| | - Han Zhu
- School of Life Sciences, Shanghai University, Shanghai, 200444, People's Republic of China
| | - Qiang Chen
- School of Life Sciences, Shanghai University, Shanghai, 200444, People's Republic of China.,School of Medicine, Shanghai University, Shanghai, 200444, People's Republic of China
| | - Yongkai Lu
- School of Life Sciences, Shanghai University, Shanghai, 200444, People's Republic of China
| | - Jie Chen
- School of Life Sciences, Shanghai University, Shanghai, 200444, People's Republic of China.,School of Medicine, Shanghai University, Shanghai, 200444, People's Republic of China
| | - Yawen Liu
- School of Medicine, Shanghai University, Shanghai, 200444, People's Republic of China.,School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, People's Republic of China
| | - Hongxia Chen
- School of Life Sciences, Shanghai University, Shanghai, 200444, People's Republic of China.
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2
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Han Y, Wu H, Liu F, Cheng G, Zhe J. Label-free biomarker assay in a microresistive pulse sensor via immunoaggregation. Anal Chem 2014; 86:9717-22. [PMID: 25226582 DOI: 10.1021/ac502270n] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present a label-free biomarker detection method based on immunoaggregation and resistive pulse sensing technology. In this approach, target biomarkers and antibody (Ab)-functionalized microparticles are mixed to form biomarker-microparticle aggregates. A resistive pulse sensor is then used to measure the sizes and count the number of aggregates. The measured volume fraction of the aggregates represents the concentration of the targeted biomarker. In our tests, human ferritin, used as a biomarker, triggered the aggregation of antiferritin Ab-functionalized microparticles in phosphate-buffered saline (PBS). The volume fraction of aggregates increased with the increased ferritin concentration. We also demonstrated the detection of human ferritin in 10% fetal bovine serum (FBS) to mimic a real detection environment in complex media. The detection range from 0.1 to 208 ng/mL was achieved. In addition, we demonstrated that the detection range can be shifted to lower and higher concentrations by decreasing and increasing microparticle concentrations. This biomarker detection method is label-free, rapid, and able to quantitatively measure the concentration of any macromolecular biomarker as long as an antibody can be found, with simple measurement setup and sample preparations.
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Affiliation(s)
- Yu Han
- Department of Mechanical Engineering, and ‡Department of Chemical and Biomolecular Engineering, University of Akron , Akron, Ohio 44325, United States
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3
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Induced-fit binding of laccase to gold and carbon electrodes for the biological fuel cell applications. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2013.08.024] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Bin Y, Chen S, Xiang J. pH-dependent kinetics of copper ions binding to amyloid-β peptide. J Inorg Biochem 2013; 119:21-7. [DOI: 10.1016/j.jinorgbio.2012.10.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2012] [Revised: 10/11/2012] [Accepted: 10/24/2012] [Indexed: 12/31/2022]
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5
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Electrochemical Glucose Sensors and Their Application in Diabetes Management. MODERN ASPECTS OF ELECTROCHEMISTRY 2013. [DOI: 10.1007/978-1-4614-6148-7_5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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6
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Peng Y, Jiang D, Su L, Zhang L, Yan M, Du J, Lu Y, Liu YN, Zhou F. Mixed monolayers of ferrocenylalkanethiol and encapsulated horseradish peroxidase for sensitive and durable electrochemical detection of hydrogen peroxide. Anal Chem 2009; 81:9985-92. [PMID: 19928778 PMCID: PMC2795022 DOI: 10.1021/ac901833s] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
This paper describes the construction of a mixed monolayer of ferrocenylalkanethiol and encapsulated horseradish peroxidase (HRP) at a gold electrode for amperometric detection of H(2)O(2) at trace levels. By tuning the alkanethiol chain lengths that tether the HRP enzyme and the ferrocenylalkanethiol (FcC(11)SH) mediator, facile electron transfer between FcC(11)SH and HRP can be achieved. Unlike most HRP-based electrochemical sensors, which rely on HRP-facilitated H(2)O(2) reduction (to H(2)O), the electrocatalytic current is resulted from an HRP-catalyzed oxidation reaction of H(2)O(2) (to O(2)). Upon optimizing other experimental conditions (surface coverage ratio, pH, and flow rate), the electrocatalytic reaction proceeding at the electrode was used to attain a low amperometric detection level (0.64 nM) and a dynamic range spanning over 3 orders of magnitude. Not only does the thin hydrophilic porous HRP capsule allow facile electron transfer, it also enables H(2)O(2) to permeate. More significantly, the enzymatic activity of the encapsulated HRP is retained for a considerably longer period (>3 weeks) than naked HRP molecules attached to an electrode or those wired to a redox polymer thin film. By comparing to electrodes modified with denatured HRP that are subsequently encapsulated or embedded in a poly-L-lysine matrix, it is concluded that the encapsulation has significantly preserved the native structure of HRP and therefore its enzymatic activity. The electrode covered with FcC(11)SH and encapsulated HRP is shown to be capable of rapidly and reproducibly detecting H(2)O(2) present in complex sample media.
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Affiliation(s)
- Yong Peng
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032, USA
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7
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Comparison of a Resonant Mirror Biosensor (IAsys) and a Quartz Crystal Microbalance (QCM) for the Study on Interaction between Paeoniae Radix 801 and Endothelin-1. SENSORS 2008; 8:8275-8290. [PMID: 27873988 PMCID: PMC3791019 DOI: 10.3390/s8128275] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2008] [Revised: 12/01/2008] [Accepted: 12/02/2008] [Indexed: 12/02/2022]
Abstract
A resonant mirror biosensor, IAsys, and a quartz crystal microbalance (QCM) are known independently as surface sensitive analytical devices capable of label-free and in situ bioassays. In this study, an IAsys and a QCM are employed for a new study on the action mechanism of Paeoniae Radix 801 (P. radix 801) by detecting the specific interaction between P. radix 801 and endothelin-1 (ET-1). In the experiments, ET-1 was immobilized on the surfaces of the IAsys cuvette and the QCM substrate by surface modification techniques, and then P. radix 801 solution was contacted to the cuvette and the substrate, separately. Then, the binding and interaction process between P. radix 801 and ET-1 was monitored by IAsys and QCM, respectively. The experimental results showed that P. radix 801 binds ET-1 specifically. The IAsys and QCM response curves to the ET-1 immobilization and P. radix 801 binding are similar in reaction process, but different in binding profiles, reflecting different resonation principles. Although both IAsys and QCM could detect the interaction of P. radix 801 and ET-1 with high reproducibility and reliability through optimization of the ET-1 coating, the reproducibility and reliability obtained by IAsys are better than those obtained by QCM, since the QCM frequency is more sensitive to temperature fluctuations, atmospheric changes and mechanical disturbances. However, IAsys and QCM are generally potent and reliable tools to study the interaction of P. radix 801 and ET-1, and can conclusively be applied to the action mechanism of P. radix 801.
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8
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Matharu Z, Arya SK, Sumana G, Gupta V, Malhotra BD. Self-assembled monolayer for low density lipoprotein detection. J Mol Recognit 2008; 21:419-24. [DOI: 10.1002/jmr.922] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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9
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Bahshi L, Frasconi M, Tel-Vered R, Yehezkeli O, Willner I. Following the Biocatalytic Activities of Glucose Oxidase by Electrochemically Cross-Linked Enzyme−Pt Nanoparticles Composite Electrodes. Anal Chem 2008; 80:8253-9. [DOI: 10.1021/ac801398m] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lily Bahshi
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Dipartimento di Studi di Chimica e Tecnologia delle Sostanze Biologicamente Attive, Universita “La Sapienza”, Rome, Italy
| | - Marco Frasconi
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Dipartimento di Studi di Chimica e Tecnologia delle Sostanze Biologicamente Attive, Universita “La Sapienza”, Rome, Italy
| | - Ran Tel-Vered
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Dipartimento di Studi di Chimica e Tecnologia delle Sostanze Biologicamente Attive, Universita “La Sapienza”, Rome, Italy
| | - Omer Yehezkeli
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Dipartimento di Studi di Chimica e Tecnologia delle Sostanze Biologicamente Attive, Universita “La Sapienza”, Rome, Italy
| | - Itamar Willner
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel, and Dipartimento di Studi di Chimica e Tecnologia delle Sostanze Biologicamente Attive, Universita “La Sapienza”, Rome, Italy
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10
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Heller A, Feldman B. Electrochemical Glucose Sensors and Their Applications in Diabetes Management. Chem Rev 2008; 108:2482-505. [PMID: 18465900 DOI: 10.1021/cr068069y] [Citation(s) in RCA: 926] [Impact Index Per Article: 57.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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An in situ electrochemical surface plasmon resonance immunosensor with polypyrrole propylic acid film: Comparison between SPR and electrochemical responses from polymer formation to protein immunosensing. Biosens Bioelectron 2008; 23:1055-62. [DOI: 10.1016/j.bios.2007.10.026] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2007] [Revised: 10/24/2007] [Accepted: 10/24/2007] [Indexed: 11/24/2022]
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12
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Tang H, Wang Q, Xie Q, Zhang Y, Tan L, Yao S. Enzymatically biocatalytic precipitates amplified antibody-antigen interaction for super low level immunoassay: an investigation combined surface plasmon resonance with electrochemistry. Biosens Bioelectron 2007; 23:668-74. [PMID: 17869088 DOI: 10.1016/j.bios.2007.08.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2007] [Revised: 07/16/2007] [Accepted: 08/03/2007] [Indexed: 11/21/2022]
Abstract
We demonstrated a simple and efficient strategy, which based on the enzymatically biocatalytic precipitates amplified antibody-antigen interaction, for improving the response signals of surface plasmon resonance (SPR) immunosensing. The antibody-antigen-alkaline phosphatase (AP) labeled secondary antibody sandwich were successfully prepared and characterized by SPR, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The SPR signal amplification was accomplished through probing resonance angle shift and Faradaic electron impedance of [Fe(CN)(6)](3-/4-) redox pair after the enzymatically biocatalytic products precipitating on the immunosensing electrode surface. As a result, the accumulation of the enzymatically biocatalytic precipitates leads to significantly resonance angle shift and increase of electron transfer impedance of [Fe(CN)(6)](3-/4-) probe. The precipitates-enhanced sandwich SPR immunoassay for mouse immunoglobulin G (m-IgG) can easily detect solution protein concentrations in the linear range of 0.02-40 ng mL(-1) and with a detection limit of 200 fg mL(-1), which is more than four-orders and 10 times better compared with the values using streptavidin-biotinylated protein complex and biotinylated HRP biocatalyzation amplification methods. Moreover, this method is generally applicable to other sandwich immunoassays and also can be expanded to monitor other antibody-antigen interaction for immunosensing detection at low concentrations.
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Affiliation(s)
- Hao Tang
- Ministry of Education Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha, PR China.
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13
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Formation and Characterization of Self-Assembled Phenylboronic Acid Derivative Monolayers toward Developing Monosaccaride Sensing-Interface. SENSORS 2007. [DOI: 10.3390/s7081480] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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14
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Cao C, Sim SJ. Signal enhancement of surface plasmon resonance immunoassay using enzyme precipitation-functionalized gold nanoparticles: A femto molar level measurement of anti-glutamic acid decarboxylase antibody. Biosens Bioelectron 2007; 22:1874-80. [PMID: 16934448 DOI: 10.1016/j.bios.2006.07.021] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2006] [Revised: 07/06/2006] [Accepted: 07/13/2006] [Indexed: 10/24/2022]
Abstract
Colloidal gold nanoparticles (AuNPs) and precipitation of an insoluble product formed by HRP-biocatalyzed oxidation of 3,3'-diaminobenzidine (DAB) in the presence of H2O2 were used to enhance the signal obtained from the surface plasmon resonance (SPR) biosensor. The AuNPs were synthesized and functionalized with HS-OEG3-COOH by self assembling technique. Thereafter, the HS-OEG3-COOH functionalized nanoparticles were covalently conjugated with horseradish peroxidase (HRP) and anti IgG antibody to form an enzyme-immunogold complex. Characterizations were performed by several methods: UV-vis absorption, DLS, HR-TEM and FT-IR. The Au-anti IgG-HRP complex has been applied in enhancement of SPR immunoassay using a sensor chip constructed by 1:9 molar ratio of HS-OEG6-COOH and HS-OEG3-OH for detection of anti-GAD antibody. As a result, AuNPs showed their enhancement as being consistent with other previous studies while the enzyme precipitation using DAB substrate was applied for the first time and greatly amplified the SPR detection. The limit of detection was found as low as 0.03 ng/ml of anti-GAD antibody (or 200 fM) which is much higher than that of previous reports. This study indicates another way to enhance SPR measurement, and it is generally applicable to other SPR-based immunoassays.
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Affiliation(s)
- Cuong Cao
- Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
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15
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Hasenbank MS, Fu E, Nelson JB, Schwartz DT, Yager P. Investigation of heterogeneous electrochemical processes using multi-stream laminar flow in a microchannel. LAB ON A CHIP 2007; 7:441-7. [PMID: 17389959 DOI: 10.1039/b616927a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
A multi-component microfluidic electrochemical cell is shown to be a useful analytical tool for probing complex coupled processes in electrolytic systems. We recently reported an enzymatic signal amplification phenomenon that may provide increased sensitivity when detecting bio-analytes (M. S. Hasenbank, E. Fu and P. Yager, Langmuir, 2006, 22, 7451-7453), but to fully harness this method requires an improved understanding of the underlying electrochemical and chemical processes. We use spatial control of electrolyte streams on patterned conductive substrates in a microfluidic platform to elucidate the coupling of homogeneous chemical steps to heterogeneous electrochemical charge transfer processes. Because the gold surface was observable using SPR imaging, electrochemical phenomena could be monitored optically in real time. Based on these and additional results, we propose a mechanism for the novel amplification phenomenon that involves direct electron transfer between surface-immobilized enzyme molecules and the gold surface. This improved understanding of the underlying mechanism should enable the future implementation of this phenomenon in signal amplification schemes for highly sensitive lab-on-a-chip biosensors.
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Affiliation(s)
- Melissa S Hasenbank
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
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16
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Hanko M, Bruns N, Tiller JC, Heinze J. Optical biochemical sensor for determining hydroperoxides in nonpolar organic liquids as archetype for sensors consisting of amphiphilic conetworks as immobilisation matrices. Anal Bioanal Chem 2006; 386:1273-83. [PMID: 17019582 DOI: 10.1007/s00216-006-0680-2] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2006] [Revised: 06/26/2006] [Accepted: 07/14/2006] [Indexed: 10/24/2022]
Abstract
This paper reports the successful design of a prototype of an optical biochemical sensor for the determination of hydroperoxides in nonpolar organic liquids. The sensor consists of a matrix of an amphiphilic polymer conetwork (APCN), a novel class of very promising polymeric materials for easy preparation of biochemical sensor matrices. APCNs are characterised by nanoscopic phase separation between the hydrophilic and the hydrophobic phases. For medium ratios of conetwork composition, the domains of both phases are interconnected both on the surface of the conetworks and throughout the bulk. The APCNs have peculiar swelling properties-the hydrophilic phase swells in hydrophilic media and the hydrophobic phase swells in hydrophobic media. In both types of media dissolved reagents can diffuse from the solution into the swollen phase of the polymeric conetwork. This enables loading of the hydrophilic phase of the APCNs with enzymes and indicator reagents by simple impregnation. Hydrophobic analytes can diffuse into the polymeric conetwork via its hydrophobic phase and react with indicator reagents immobilised in the hydrophilic phase at the huge internal interface between the two opposite phases.To prepare the described hydroperoxide-sensitive biosensors, we used APCN films consisting of 58% (w/w) poly(2-hydroxyethyl acrylate) (PHEA) as hydrophilic chains and 42% (w/w) polydimethylsiloxane (PDMS) as hydrophobic linkers. Horseradish peroxidase (HRP) and diammonium 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) as indicator reagent were co-immobilised in this optically clear and transparent matrix. In this feasibility study the conditions investigated were principally those relevant to characterisation of the innovative matrix material and the disposable biosensor produced from it; the biosensor was not optimised. Sensitivity toward tert-butylhydroperoxide (tBuOOH) dissolved in n-heptane was acceptable, between approximately 1 and at least 50 mmol L(-1), even in the dry state. The response time was 1.7 to 5.0 min. No leaching of immobilised reagents was observed during a period of at least one hour. Pre-swelling the sensors with water increased the reaction rate and the total turnover number of the enzyme. In a dry atmosphere at 4 degrees C the sensors were found to be stable for at least two weeks.
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Affiliation(s)
- Michael Hanko
- Freiburg Materials Research Centre (FMF), Institute of Physical Chemistry, Albert-Ludwigs-University Freiburg, Stefan-Meier-Strasse 21, 79104 Freiburg, Germany
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17
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Su X, Wu YJ, Knoll W. Comparison of surface plasmon resonance spectroscopy and quartz crystal microbalance techniques for studying DNA assembly and hybridization. Biosens Bioelectron 2006; 21:719-26. [PMID: 16242610 DOI: 10.1016/j.bios.2005.01.006] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2004] [Revised: 12/15/2004] [Accepted: 01/07/2005] [Indexed: 10/25/2022]
Abstract
In this study we evaluate the strengths and weaknesses of surface plasmon resonance (SPR) spectroscopy and quartz crystal microbalance (QCM) technique for studying DNA assembly and hybridization reactions. Specifically, we apply in parallel an SPR instrument and a 5 MHz QCM device with dissipation monitoring (QCM-D) to monitor the assembly of biotinylated DNA (biotin-DNA) on a streptavidin-modified surface and the subsequent target DNA hybridization. Through the parallel measurements, we demonstrate that SPR is more suitable for quantitative analysis of DNA binding amount, which is essential for interfacial DNA probe density control and for the analysis of its effect on hybridization efficiency and kinetics. Although the QCM is not quantitative to the same extent as SPR (QCM measures the total mass of the bound DNA molecules together with the associated water), the dissipation factor of the QCM provides a qualitative measure of the viscoelastic properties of DNA films and the conformation of the bound DNA molecules. The complexity in mass measurement does not impair QCM's potential for a kinetic evaluation of the hybridization processes. For quantification of target DNA, the biotin-DNA modified SPR and QCM sensors are exposed to target DNA with increasing concentration. The plots of SPR/QCM signals versus target DNA concentration show that water entrapment between DNA strands make the QCM sensitivity for the hybridization assay well comparable with that of the SPR, although the intrinsic mass sensitivity of the 5 MHz QCM is approximately 20 times lower.
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Affiliation(s)
- Xiaodi Su
- Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore.
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18
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Su X, Zong Y, Richter R, Knoll W. Enzyme immobilization on poly(ethylene-co-acrylic acid) films studied by quartz crystal microbalance with dissipation monitoring. J Colloid Interface Sci 2005; 287:35-42. [PMID: 15914146 DOI: 10.1016/j.jcis.2005.01.089] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2004] [Revised: 01/10/2005] [Accepted: 01/24/2005] [Indexed: 10/25/2022]
Abstract
In this study, we use the quartz crystal microbalance with dissipation monitoring (QCM-D) to study the immobilization of the enzyme horseradish peroxidase (HRP) on poly(ethylene-co-acrylic acid) (PEAA) films. The surface polarity of spin-coated PEAA films was varied by heat treatments in air or in a 30% NaOH aqueous solution leading to COOH-depleted or COOH-enriched surfaces, respectively. Two reaction schemes, direct adsorption and amine coupling, were employed for HRP immobilization on the two surfaces. The shifts in frequency and dissipation, Deltaf and DeltaD, measured by QCM-D and the ratio DeltaD/Deltaf were used to evaluate the binding amount and the conformation of the adsorbed enzyme. It is found that HRP immobilized via covalent linkages forms rigid and little dissipative films. In contrast, directly adsorbed HRP films exhibit a highly dissipative structure. HRP-catalyzed oxidation of the 4-chloro-1-naphthol in the presence of H(2)O(2) was used to characterize the catalytic activity of the HRP films. The results show that the enzymatic activity of the covalently immobilized HRP tends to be higher.
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Affiliation(s)
- Xiaodi Su
- Institute of Materials Research and Engineering, 3 Research Link, 117602 Singapore.
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Huang JD, Song Z, Li J, Wu BY, Yin HJ, Chen KJ, Chen Q. Study on the therapeutic mechanism of the active principle of the Chinese drug Paeoniae Radix 801 through affinity biosensors IAsys Plus quartz crystal microbalance. Chin J Integr Med 2005; 11:37-40. [PMID: 15975306 DOI: 10.1007/bf02835747] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To study the targeted point and mechanism of the function of the blood-activating and stasis-removing Chinese drugs, Paeoniae Radix 801(PR801) in its cardiovascular protective effects and its specific binding with endothelin 1 (ET-1) as well as the dynamics of the two's interactive function by means of using affinity biosensors: IAsys Plus and quartz crystal microbalance (IAQCM). METHODS ET-1 was immobilized on the surfaces of IAQCM by using the new surface modification methods. The PR801 in the solution was detected by modified substrates and the specific binding between PR801 and ET-1 was studied. RESULTS The curves went up or down after adding PR801. There is specific binding between PR801 and ET-1. The bound mass were 0.458 ng/mm(2) and 133.54 ng/cm(2), respectively. There exists relatively good stability with these two methods. CONCLUSION The affinity biosensors: IAQCM can be used to study the interaction mechanism between PR801 and ET-1, providing a new way to study the interaction mechanism of TCM. PR801 can bind ET-1 specifically in the experiments. Therefore, ET-1 is another target that PR801 can bind specifically besides thromboxane A(2).
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Affiliation(s)
- Jia-dong Huang
- College of Life Sciences, Nankai University, Tianjin, China
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20
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Ruan C, Zeng K, Varghese OK, Grimes CA. A magnetoelastic bioaffinity-based sensor for avidin. Biosens Bioelectron 2004; 19:1695-701. [PMID: 15142604 DOI: 10.1016/j.bios.2004.01.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2003] [Revised: 12/17/2003] [Accepted: 01/07/2004] [Indexed: 11/24/2022]
Abstract
A magnetoelastic bioaffinity sensor coupled with biocatalytic precipitation is described for avidin detection. The non-specific adsorption characteristics of streptavidin on different functionalized sensor surfaces are examined. It is found that a biotinylated poly(ethylene glycol) (PEG) interface can effectively block non-specific adsorption of proteins. Coupled with the PEG immobilized sensor surface, alkaline phosphatase (AP) labeled streptavidin is used to track specific binding on the sensor. This mass-change-based signal is amplified by the accumulation on the sensor of insoluble products of 5-bromo-4-chloro-3-indolyl phosphate catalyzed by AP. The resulting mass loading on the sensor surface in turn shifts the resonance frequency of the magnetoelastic sensors, with an avidin detection limit of approximately 200 ng/ml.
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Affiliation(s)
- Chuanmin Ruan
- Department of Electrical Engineering, 217 Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania, PA 16802, USA
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21
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Lee M, Kim TI, Kim KH, Kim JH, Choi MS, Choi HJ, Koh K. Formation of a self-assembled phenylboronic acid monolayer and its application toward developing a surface plasmon resonance-based monosaccharide sensor. Anal Biochem 2002; 310:163-70. [PMID: 12423634 DOI: 10.1016/s0003-2697(02)00305-6] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
For the surface-optoelectronic study of sugar sensing, we synthesized and characterized dithiobis(4-butyrylamino-m-phenylboronic acid) (DTBA-PBA) as a recognition molecule. DTBA-PBA has a boronic acid group that has been known to form covalently bonded complexes with the 1,2- or 1,3-diol of sugars. A self-assembled monolayer (SAM) of DTBA-PBA was formed on a gold surface and characterized by atomic-force microscopy, Fourier transform infrared reflection absorption spectroscopy, and surface electrochemical measurements. An interaction study between monosaccharides and DTBA-PBA SAM was performed using surface plasmon resonance spectroscopy. The increase in molecular interactions between DTBA-PBA SAM and monosaccharides resulted in an optically induced electron excitation change on the Au surface through a refractive index change of the interfacial recognition layer. This correlation between electron excitation and molecular interaction was measurable at very low monosaccharide concentrations (1.0 x 10(-12)M). DTBA-PBA SAM shows a selective fructose sensing among four kinds of monosaccharides, even in a low concentration range.
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Affiliation(s)
- Minsu Lee
- Department of Sensor Engineering, Graduate School, Kyungpook National University, Taegu 702-701, South Korea
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Abstract
We have assembled references of 700 articles published in 2001 that describe work performed using commercially available optical biosensors. To illustrate the technology's diversity, the citation list is divided into reviews, methods and specific applications, as well as instrument type. We noted marked improvements in the utilization of biosensors and the presentation of kinetic data over previous years. These advances reflect a maturing of the technology, which has become a standard method for characterizing biomolecular interactions.
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Affiliation(s)
- Rebecca L Rich
- Center for Biomolecular Interaction Analysis, University of Utah, Salt Lake City, UT 84132, USA
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