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Bai H, Yuan M, Wang X, Wang X, Che J. Development of a Gold Nanoparticle-Functionalized Surface Plasmon Resonance Assay for the Sensitive Detection of Monoclonal Antibodies and Its Application in Pharmacokinetics. Drug Metab Dispos 2019; 47:1361-1367. [PMID: 31324700 DOI: 10.1124/dmd.119.086249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2019] [Accepted: 07/15/2019] [Indexed: 11/22/2022] Open
Abstract
As a prominent human therapeutic, therapeutic monoclonal antibodies (mAbs) have attracted increasing attention in the past decade due to their high-targeting specificity, low toxicity, and prolonged efficacy. Systematic pharmacokinetic analysis of mAbs not only largely facilitates the understanding of their biologic functions but also promotes the development of therapeutic drug discovery, early clinical trial implementation, and therapeutic monitoring. However, the extremely complex nature of biomatrices and the especially low dosages of mAbs make their detection in biomatrices and further pharmacokinetic analysis highly challenging. Therefore, a method capable of reliably, quickly, and sensitively quantifying mAbs in biomatrices is urgently needed. In this work, we developed and evaluated an gold nanoparticle-functionalized surface plasmon resonance assay for cetuximab (C225) detection and pharmacokinetic analysis in rhesus monkeys. Combining its advantages of label-free pretreatment and amplified signal response, the lower limit of quantitation of C225 in monkey serum was reduced to 0.0125 μg/ml, and the linear range had an order of magnitude comparable to that of an ELISA-based method. Furthermore, the pharmacokinetics of C225 in rhesus monkeys was studied after intravenous infusions of single doses at 7.5, 24, and 75 mg/kg. The concentration of C225 in monkey serum was detectable after dosing for 720 hours. We believe that this new strategy will be applicable as a general protocol for mAb quantification, pharmacokinetic characteristic determination, and toxicokinetic analysis during drug development.
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Affiliation(s)
- Haihong Bai
- Phase I Clinical Trial Center, Beijing Shijitan Hospital of Capital Medical University, Beijing, PR China (H.B., Xin.W.); State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing, PR China (M.Y., J.C.); and Chinese Pharmaceutical Association, Beijing, PR China (Xia.W.)
| | - Mei Yuan
- Phase I Clinical Trial Center, Beijing Shijitan Hospital of Capital Medical University, Beijing, PR China (H.B., Xin.W.); State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing, PR China (M.Y., J.C.); and Chinese Pharmaceutical Association, Beijing, PR China (Xia.W.)
| | - Xiaojing Wang
- Phase I Clinical Trial Center, Beijing Shijitan Hospital of Capital Medical University, Beijing, PR China (H.B., Xin.W.); State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing, PR China (M.Y., J.C.); and Chinese Pharmaceutical Association, Beijing, PR China (Xia.W.)
| | - Xinghe Wang
- Phase I Clinical Trial Center, Beijing Shijitan Hospital of Capital Medical University, Beijing, PR China (H.B., Xin.W.); State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing, PR China (M.Y., J.C.); and Chinese Pharmaceutical Association, Beijing, PR China (Xia.W.)
| | - Jinjing Che
- Phase I Clinical Trial Center, Beijing Shijitan Hospital of Capital Medical University, Beijing, PR China (H.B., Xin.W.); State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing, PR China (M.Y., J.C.); and Chinese Pharmaceutical Association, Beijing, PR China (Xia.W.)
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2
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Antohe I, Spasic D, Delport F, Li J, Lammertyn J. Nanoscale patterning of gold-coated optical fibers for improved plasmonic sensing. NANOTECHNOLOGY 2017; 28:215301. [PMID: 28375849 DOI: 10.1088/1361-6528/aa6b53] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Merging surface plasmon resonance (SPR) to fiber optic (FO) technology has brought remarkable achievements in the field by offering attractive advantages over the conventional prism-based SPR platforms, such as simplicity, cost-effectiveness and miniaturization. However, the performance of the existing FO-SPR instruments mainly depends on the device surface condition and in particular on the structural aspect of the thin gold (Au) plasmonic film deposited on the FO substrate. In this work, a simple cost-effective colloidal lithography technique (CLT) was adapted and applied for the first time to the micrometer-sized FO substrate, to design end reflection-type FO-SPR sensors with periodic arrays of Au triangularly-shaped nanostructures on the Au mirror FO tip distal end. The nanopatterned FO-SPR sensor tips were afterwards subjected to refractometric measurements in a sucrose dilution series and subsequently compared with their non-patterned counterparts. It was observed that the spectral dips of the nanopatterned FO-SPR sensor tips were shifted towards longer wavelengths after CLT patterning. Moreover, the sensor sensitivity was improved with up to 25% compared to the conventional non-patterned FO-SPR devices. The obtained results represent important steps in the development of a new generation of FO-SPR sensors with improved performance, which can ultimately be used in various applications, ranging from food analysis and environmental monitoring, to health control and medical diagnosis.
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Affiliation(s)
- Iulia Antohe
- Department of Biosystems, MeBioS-Biosensor group, KU Leuven, Willem de Croylaan 42, B-3001 Leuven, Belgium. Laser Department, National Institute for Laser, Plasma and Radiation Physics, Atomiştilor 409, RO-77125 Bucharest-Măgurele, Romania
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Mahouche-Chergui S, Guerrouache M, Carbonnier B, Chehimi MM. Polymer-immobilized nanoparticles. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.04.013] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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4
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Song HD, Choi I, Lee S, Yang YI, Kang T, Yi J. On-Chip Colorimetric Detection of Cu2+ Ions via Density-Controlled Plasmonic Core–Satellites Nanoassembly. Anal Chem 2013; 85:7980-6. [DOI: 10.1021/ac401796q] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hyeon Don Song
- World Class
University Program
of Chemical Convergence for Energy and Environment, School of Chemical
and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic
of Korea
| | - Inhee Choi
- World Class
University Program
of Chemical Convergence for Energy and Environment, School of Chemical
and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic
of Korea
| | - Suseung Lee
- World Class
University Program
of Chemical Convergence for Energy and Environment, School of Chemical
and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic
of Korea
| | - Young In Yang
- World Class
University Program
of Chemical Convergence for Energy and Environment, School of Chemical
and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic
of Korea
| | - Taewook Kang
- Department of
Chemical and Biomolecular
Engineering, Sogang University, Seoul,
121-742, Republic of Korea
| | - Jongheop Yi
- World Class
University Program
of Chemical Convergence for Energy and Environment, School of Chemical
and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 151-742, Republic
of Korea
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Saha K, Agasti SS, Kim C, Li X, Rotello VM. Gold nanoparticles in chemical and biological sensing. Chem Rev 2012; 112:2739-79. [PMID: 22295941 PMCID: PMC4102386 DOI: 10.1021/cr2001178] [Citation(s) in RCA: 2841] [Impact Index Per Article: 218.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Krishnendu Saha
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, MA 01003, USA
| | - Sarit S. Agasti
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, MA 01003, USA
| | - Chaekyu Kim
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, MA 01003, USA
| | - Xiaoning Li
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, MA 01003, USA
| | - Vincent M. Rotello
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, MA 01003, USA
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Fernández F, Sánchez-Baeza F, Marco MP. Nanogold probe enhanced Surface Plasmon Resonance immunosensor for improved detection of antibiotic residues. Biosens Bioelectron 2012; 34:151-8. [DOI: 10.1016/j.bios.2012.01.036] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2011] [Revised: 01/02/2012] [Accepted: 01/27/2012] [Indexed: 11/27/2022]
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Wang J, Banerji S, Menegazzo N, Peng W, Zou Q, Booksh KS. Glucose detection with surface plasmon resonance spectroscopy and molecularly imprinted hydrogel coatings. Talanta 2011; 86:133-41. [DOI: 10.1016/j.talanta.2011.08.046] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Revised: 08/22/2011] [Accepted: 08/23/2011] [Indexed: 10/17/2022]
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Touahir L, Niedziółka-Jönsson J, Galopin E, Boukherroub R, Gouget-Laemmel AC, Solomon I, Petukhov M, Chazalviel JN, Ozanam F, Szunerits S. Surface plasmon resonance on gold and silver films coated with thin layers of amorphous silicon-carbon alloys. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:6058-6065. [PMID: 20131832 DOI: 10.1021/la903896m] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The paper reports on a novel surface plasmon resonance (SPR) substrate architecture based on the coating of a gold (Au) or silver (Ag) substrate with 5 nm thin amorphous silicon-carbon alloy films. Ag/a-Si(1-x)C(x):H and Au/a-Si(1-x)C(x):H multilayers are found to provide a significant advantage in terms of sensitivity over both Ag and Au for SPR refractive index sensing. The possibility for the subsequent linking of stable organic monolayers through Si-C bonds is demonstrated. In a proof-of-principle experiment that this structure can be used for real-time biosensing experiments, amine terminated biotin was covalently linked to the acid-terminated SPR surface and the specific streptavidin-biotin interaction recorded.
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Affiliation(s)
- Larbi Touahir
- Physique de la Matière Condensée, Ecole Polytechnique, CNRS, 91128 Palaiseau, France
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9
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Ding M, Zheng R. Preparation of Amino-functionalized Multiwall Carbon Nanotube/Gold Nanoparticle Composites. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.201090055] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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10
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Chah S, Zare RN. Surface plasmon resonance study of vesicle rupture by virus-mimetic attack. Phys Chem Chem Phys 2008; 10:3203-8. [DOI: 10.1039/b802632g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Selective Immobilization of Gold Nanoparticles on the Surface of a Photoreactive Polymer. MONATSHEFTE FUR CHEMIE 2007. [DOI: 10.1007/s00706-007-0608-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Riskin M, Katz E, Gutkin V, Willner I. Photochemically controlled electrochemical deposition and dissolution of Ag0 nanoclusters on au electrode surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:10483-9. [PMID: 17129019 DOI: 10.1021/la061101z] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A photoisomerizable thiolated nitrospiropyran SP, (1a), monolayer is assembled on a Au electrode by the primary deposition of thiolated nitromerocyanine isomer 1b as a monolayer on the electrode, followed by the irradiation of the surface with visible light, lambda > 475 nm. The surface coverage of nitrospiropyran units (1a) on the electrode is 2 x 10-10 mole cm-2. Irradiation of the electrode with UV light, 320 nm < lambda < 360 nm, results in the nitromerocyanine, MR, monolayer on the electrode that binds Ag+ ions to the phenolate units. The Ag+ ions associated with the MR monolayer undergo cyclic reduction to surface-confined Ag0 nanoclusters, and reoxidation and dissolution of the Ag0 nanoclusters to Ag+ ions associated with the monolayer are demonstrated. The electron-transfer rate constants for the reduction of Ag+ to Ag0 and for the dissolution of Ag0 were determined by chronoamperometry and correspond to ketred = 12.7 s-1 and ketox = 10.5 s-1, respectively. The nanoclustering rate was characterized by surface plasmon resonance measurements, and it proceeds on a time scale of 10 min. The size of the Ag0 nanoclusters is in the range of 2 to 20 nm. The electrochemically induced reduction of the MR-Ag+ monolayer to the MR-Ag0 surface and the reoxidation of the MR-Ag0 surface control the hydrophilic-hydrophobic properties of the surface. The advancing contact angle of the MR-Ag0-functionalized surface is 59 degrees , and the contact angle of the MR-Ag+-monolayer-functionalized surface is 74 degrees . Photoisomerization of the Ag0-MR surface to the Ag0-SP state, followed by the oxidation of the Ag0 nanoclusters, results in the dissolution of the Ag+ ions into the electrolyte solution.
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Affiliation(s)
- Michael Riskin
- Institute of Chemistry and Center of Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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Willner I, Baron R, Willner B. Integrated nanoparticle-biomolecule systems for biosensing and bioelectronics. Biosens Bioelectron 2006; 22:1841-52. [PMID: 17071070 DOI: 10.1016/j.bios.2006.09.018] [Citation(s) in RCA: 188] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2006] [Revised: 08/18/2006] [Accepted: 09/13/2006] [Indexed: 10/24/2022]
Abstract
The similar dimensions of biomolecules such as enzymes, antibodies or DNA, and metallic or semiconductor nanoparticles (NPs) enable the synthesis of biomolecule-NP hybrid systems where the unique electronic, photonic and catalytic properties of NPs are combined with the specific recognition and biocatalytic properties of biomolecules. The unique functions of biomolecule-NP hybrid systems are discussed with several examples: (i) the electrical contacting of redox enzymes with electrodes is the basis for the development of enzymatic electrodes for amperometric biosensors or biofuel cell elements. The reconstitution of the apo-glucose oxidase or apo-glucose dehydrogenase on flavin adenine dinucleotide (FAD)-functionalized Au NPs (1.4 nm) associated with electrodes, or on pyrroloquinoline quinone (PQQ)-functionalized Au NPs (1.4 nm) associated with electrodes, respectively, yields electrically contacted enzyme electrodes. The aligned, reconstituted enzymes on the electrode surfaces reveal effective electrical contacting, and the glucose oxidase and glucose dehydrogenase reveal turnover rates of 5000 and 11,800 s(-1), respectively. (ii) The photoexcitation of semiconductor nanoparticles yields fluorescence with a wavelength controlled by the size of the NPs. The fluorescence functions of semiconductor NPs are used to develop a fluorescence resonance energy transfer (FRET) assay for nucleic acids, and specifically, for analyzing telomerase activity in cancer cells. CdSe-ZnS NPs are functionalized by a primer recognized by telomerase, and this is elongated by telomerase extracted from HeLa cancer cells in the presence of dNTPs and Texas-red-functionalized dUTP. The dye integrated into the telomers allows the FRET process that is intensified as telomerization proceeds. Also, the photoexcited electron-hole pair generated in semiconductor NPs is used to generate photocurrents in a CdS-DNA hybrid system associated with an electrode. A redox-active intercalator, methylene blue, was incorporated into a CdS-duplex DNA monolayer associated with a Au electrode, and this facilitated the electron transfer between the electrode and the CdS NPs. The direction of the photocurrent was controlled by the oxidation state of the intercalator. (iii) Biocatalysts grow metallic NPs, and the absorbance of the NPs provides a means to assay the biocatalytic transformations. This is exemplified with the glucose oxidase-induced growth of Au NPs and with the tyrosinase-stimulated growth of Au NPs, in the presence of glucose or tyrosine, respectively. The biocatalytic growth of the metallic NPs is used to grow nanowires on surfaces. Glucose oxidase or alkaline phosphatase functionalized with Au NPs (1.4 nm) acted as 'biocatalytic inks' for the synthesis of metallic nanowires. The deposition of the Au NP-modified glucose oxidase, or the Au NP-modified alkaline phosphatase on Si surfaces by dip-pen nanolithography led to biocatalytic templates, that after interaction with glucose/AuCl4- or p-aminophenolphosphate/Ag+, allowed the synthesis of Au nanowires or Ag nanowires, respectively.
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Affiliation(s)
- Itamar Willner
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
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14
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Li X, Tamada K, Baba A, Knoll W, Hara M. Estimation of Dielectric Function of Biotin-Capped Gold Nanoparticles via Signal Enhancement on Surface Plasmon Resonance. J Phys Chem B 2006; 110:15755-62. [PMID: 16898722 DOI: 10.1021/jp062004h] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Biotin-capped gold nanoparticles assembled on flat gold with volume fraction f are studied by surface plasmon resonance (SPR) spectroscopy and atomic force microscopy (AFM) in order to estimate the dielectric function of the gold nanoparticles based on the Maxwell-Garnett (MG) theory. The complex dielectric function (epsilon',epsilon'') of the spherical nanoparticles at three representative wavelengths in the vis-near-IR region, i.e., lambda = 543, 632.8, and 1152 nm, is estimated for a surface homogeneously covered with nanoparticles in order to discuss the wavelength dependence of the dielectric function. The SPR response of a surface covered with particles in 2D aggregates is also analyzed. The experimental SPR curve of the particle aggregates deviates from the theoretical predictions, suggesting dipole interactions between particles.
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Affiliation(s)
- Xinheng Li
- Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, Nagatsuta-cho, Yokohama, Kanagawa 226-8502, Japan
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15
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Moon J, Kang T, Oh S, Hong S, Yi J. In situ sensing of metal ion adsorption to a thiolated surface using surface plasmon resonance spectroscopy. J Colloid Interface Sci 2006; 298:543-9. [PMID: 16458912 DOI: 10.1016/j.jcis.2005.12.066] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2005] [Revised: 12/29/2005] [Accepted: 12/30/2005] [Indexed: 11/26/2022]
Abstract
The kinetics of the adsorption of metal ions onto a thiolated surface and the selective and quantitative sensing of metal ions were explored using surface plasmon resonance (SPR) spectroscopy. The target metal ion was an aqueous solution of Pt2+ and a thin-gold-film-coated glass substrate was modified with 1,6-hexanedithiol (HDT) as a selective sensing layer. SPR spectroscopy was used to examine the kinetics of metal ion adsorption by means of the change in SPR angle. The selectivity of the thiolated surface for Pt2+ over other divalent metal ions such as Cu2+, Ni2+, and Cd2+ was evident by the time-resolved SPR measurement. SPR angle shift, deltatheta(SPR), was found to increase logarithmically with increasing concentration of Pt2+ in the range of 1.0 x 10(-5)-1.0 mM. The rate of Pt2+ adsorption on HDT observed at both 0.1 and 1 mM Pt2+ accelerates until the surface coverage reaches approximately 17%, after which the adsorption profile follows Langmuirian behavior with the surface coverage. The experimental data indicated that heavy metal ions were adsorbed to the hydrophobic thiolated surface by a cooperative mechanism. A mixed self-assembled monolayer (SAM) composed of HDT and 11-mercaptoundecanoic acid was used to reduce the hydrophobicity of the thiol-functionalized surface. The addition of hydrophilic groups to the surface enhanced the rate of adsorption of Pt2+ onto the surface. The findings show that the adsorption of metal ions is strongly dependent upon the hydrophilicity/hydrophobicity of the surface and that the technique represents an easy method for analyzing the adsorption of metal ions to a functionalized surface by combining SPR spectroscopy with a SAM modification.
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Affiliation(s)
- Jungwoo Moon
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 151-744, South Korea
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16
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Riskin M, Basnar B, Chegel VI, Katz E, Willner I, Shi F, Zhang X. Switchable Surface Properties through the Electrochemical or Biocatalytic Generation of Ag0 Nanoclusters on Monolayer-Functionalized Electrodes. J Am Chem Soc 2006; 128:1253-60. [PMID: 16433543 DOI: 10.1021/ja0561183] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The electroswitchable and the biocatalytic/electrochemical switchable interfacial properties of a Ag(+)-biphenyldithiol (BPDT) monolayer associated with a Au surface are described. Upon the application of a potential corresponding to -0.2 V the Ag(+)-BPDT is reduced to the Ag(0)-BPDT interface, and silver nanoclusters are generated on the interface. The application of a potential that corresponds to 0.2 V reoxidizes the monolayer to the Ag(+)-BPDT monolayer. The reversible electrochemical transformation of the Ag(+)-BPDT monolayer and of the Ag(0)-BPDT surface was followed by electrochemical means and surface plasmon resonance spectroscopy (SPR). The SPR experiments enabled us to follow the kinetics of nanoclustering of Ag(0) on the surface. The hydrophobic/hydrophilic properties of the surface are controlled by the electrochemically induced transformation of the interface between the Ag(+)-BPDT and Ag(0)-BPDT states. The Ag(0)-BPDT monolayer reveals enhanced hydrophilicity. The hydrophobic/hydrophilic properties of the interface were probed by contact angle measurements and force interactions with a hydrophobically-functionalized AFM tip. The Ag(0)-BPDT interface was also biocatalytically generated using alkaline phosphatase, AlkPh, and p-aminophenyl phosphate as substrate. The biocatalytically generated p-aminophenol reduces Ag(+) ions associated with the surface to Ag(0) nanoclusters. This enables the cyclic biocatalytic/electrochemical control of the surface properties of the modified electrode.
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Affiliation(s)
- Michael Riskin
- Institute of Chemistry, The Hebrew University of Jerusalem, Israel
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17
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Mitchell JS, Wu Y, Cook CJ, Main L. Sensitivity enhancement of surface plasmon resonance biosensing of small molecules. Anal Biochem 2005; 343:125-35. [PMID: 15950915 DOI: 10.1016/j.ab.2005.05.001] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2005] [Revised: 04/29/2005] [Accepted: 05/02/2005] [Indexed: 11/24/2022]
Abstract
Surface plasmon resonance (SPR) biosensor formats using gold nanoparticle or protein signal amplification for the sensitive assay of small molecules were developed using progesterone as a model compound. Progesterone was immobilized to a dextran surface in the Biacore biosensor through in situ covalent immobilization using an oligoethylene glycol linker attached to the 4 position of the steroid. This surface produced stable antibody binding for in excess of 1100 assay cycles. Using this surface, assays were developed for progesterone using 10- and 20-nm gold-streptavidin labels attached to biotinylated monoclonal antibody in both label prebinding and sequential binding formats. Prelabeling formats gave no signal enhancement but produced assays with limits of detection of 143 pg/ml, compared with approximately 1 ng/ml in previous studies. Sequential binding formats gave signal enhancements of 2.2-fold over the monoclonal antibody and a limit of detection of 23.1 pg/ml. It was found that secondary antibody labeling gave 8.1-fold signal enhancements and a limit of detection of 20.1 pg/ml, whereas use of secondary antibody-25 nm gold complexes provided more signal enhancement (13-fold) and a further improvement in limit of detection of 8.6 pg/ml.
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Affiliation(s)
- John S Mitchell
- Bioengineering Sector, HortResearch, Private Bag 3123, Hamilton, New Zealand
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Chah S, Hammond MR, Zare RN. Gold Nanoparticles as a Colorimetric Sensor for Protein Conformational Changes. ACTA ACUST UNITED AC 2005; 12:323-8. [PMID: 15797216 DOI: 10.1016/j.chembiol.2005.01.013] [Citation(s) in RCA: 162] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2004] [Revised: 01/28/2005] [Accepted: 01/31/2005] [Indexed: 10/25/2022]
Abstract
Spherical gold nanoparticles and flat gold films are prepared in which yeast iso-1-cytochrome c (Cyt c) is covalently bound to the gold surface by a thiol group in the cystein 102 residue. Upon exposure to solutions of different pH, bound Cyt c unfolds at low pH and refolds at high pH. This conformational change causes measurable shifts in the color of the coated nanoparticle solutions detected by UV-VIS absorption spectroscopy and in the refractive index (RI) of the flat gold films detected by surface plasmon resonance (SPR) spectroscopy. Both experiments demonstrate the same trend with pH, suggesting the use of protein-covered gold nanoparticles as a simple colorimetric sensor for conformational change.
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Affiliation(s)
- Soonwoo Chah
- Department of Chemistry, Stanford University, CA 94305, USA
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19
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Chah S, Kumar CV, Hammond MR, Zare RN. Denaturation and renaturation of self-assembled yeast iso-1-cytochrome c on Au. Anal Chem 2005; 76:2112-7. [PMID: 15053677 DOI: 10.1021/ac035416k] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
We have made surface plasmon resonance (SPR) measurements of yeast iso-1-cytochrome c (Cyt c) on a gold surface. Angle-resolved SPR curves are recorded as a function of urea concentration before and after self-assembly of the Cyt c. Exposure to a urea solution causes denaturation of Cyt c, which shifts the minimum in the SPR curve to a larger angle and decreases the signal amplitude. The Gibbs free energy change for denaturation of the protein on Au is calculated from the change of the SPR signal amplitude with urea concentration. We find that (1) Cyt c can be reversibly denatured and renatured, depending on the urea concentration, and (2) the Gibbs free energy change for denaturation of Cyt c on Au surface in water, DeltaG degrees (water), is 1.5 kcal/mol, which is approximately 4 times less than that in bulk solution.
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Affiliation(s)
- Soonwoo Chah
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
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20
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He L, Smith EA, Natan MJ, Keating CD. The Distance-Dependence of Colloidal Au-Amplified Surface Plasmon Resonance. J Phys Chem B 2004. [DOI: 10.1021/jp048536k] [Citation(s) in RCA: 100] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Lin He
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802-6300
| | - Emily A. Smith
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802-6300
| | - Michael J. Natan
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802-6300
| | - Christine D. Keating
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802-6300
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Zayats M, Kharitonov AB, Pogorelova SP, Lioubashevski O, Katz E, Willner I. Probing Photoelectrochemical Processes in Au−CdS Nanoparticle Arrays by Surface Plasmon Resonance: Application for the Detection of Acetylcholine Esterase Inhibitors. J Am Chem Soc 2003; 125:16006-14. [PMID: 14677992 DOI: 10.1021/ja0379215] [Citation(s) in RCA: 159] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The photoelectrochemical charging of Au-nanoparticles (NP) in a Au-nanoparticle/CdS-nanoparticle array assembled on a Au-coated glass surface is followed by means of surface plasmon resonance (SPR) spectroscopy upon continuous irradiation of the sample. The charging of the Au-NPs results in the enhanced coupling between the localized surface plasmon of the Au-NP and the surface plasmon of the bulk surface, leading to a shift in the plasmon angle. The charging effect of the Au-NPs is supported by concomitant electrochemical experiments in the dark. Analysis of the results indicates that ca. 4.2 electrons are associated with each Au-nanoparticle under steady-state irradiation. The photoelectrochemical charging effect of the Au-NPs in the Au-CdS NP array is employed to develop a SPR sensor for acetylcholine esterase inhibitors.
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Affiliation(s)
- Maya Zayats
- Institute of Chemistry and The Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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Chah S, Fendler JH, Yi J. Nanostructured Gold Hollow Microspheres Prepared on Dissolvable Ceramic Hollow Sphere Templates. J Colloid Interface Sci 2002; 250:142-8. [PMID: 16290645 DOI: 10.1006/jcis.2002.8328] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2001] [Accepted: 02/27/2002] [Indexed: 11/22/2022]
Abstract
Fifty and one-hundred micrometer diameter nanostructured gold hollow microspheres (GHSs), in >98% purity, have been prepared by using ceramic hollow spheres, CHSs, as templates. Tennanometer diameter gold nanoparticles were covalently linked to the thiol moiety of (3-mercaptopropyl)trimethoxysilane, which had been self-assembled onto the CHSs. Greater structural strength was obtained by the generation of additional gold nanoparticles, in situ on the gold nanoparticle coated CHSs (by immersing the gold nanoparticle coated CHSs into an aqueous mixture of hydroxylamine and gold chloride). GHSs were obtained by dissolving the CHSs templates. The sizes, shapes, surface areas (185.3 m2/g for CHSs and 182.9 m2/g for GHSs), pore diameters (7.7 nm for CHSs and 7.8 nm for GHSs), and pore volumes (0.41 cm3/g for CHSs and 0.36 cm3/g for GHSs) of GHSs were quite similar to their CHSs counterparts. Significantly, GHSs showed surface plasmon bands whose maximum (644 nm) shifted from that observed for the parent 10-nm gold nanoparticles (522 nm).
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Affiliation(s)
- S Chah
- School of Chemical Engineering, Seoul National University, Seoul, 151-742, Korea
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