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Li N, Huang X, Chen J, Shao H. Investigating the conversion from coordination bond to electrostatic interaction on self-assembled monolayer by SECM. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Nomura K, Mikuni S, Nakaji-Hirabayashi T, Gemmei-Ide M, Kitano H, Noguchi H, Uosaki K. Water structure at the interfaces between a zwitterionic self-assembled monolayer/liquid water evaluated by sum-frequency generation spectroscopy. Colloids Surf B Biointerfaces 2015; 135:267-273. [DOI: 10.1016/j.colsurfb.2015.07.072] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 07/24/2015] [Accepted: 07/27/2015] [Indexed: 01/20/2023]
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Sum-frequency generation analyses of the structure of water at amphoteric SAM–liquid water interfaces. Colloids Surf B Biointerfaces 2014; 121:264-9. [DOI: 10.1016/j.colsurfb.2014.04.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2013] [Revised: 04/26/2014] [Accepted: 04/28/2014] [Indexed: 01/31/2023]
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Suzuki H, Li L, Nakaji-Hirabayashi T, Kitano H, Ohno K, Matsuoka K, Saruwatari Y. Carboxymethylbetaine copolymer layer covalently fixed to a glass substrate. Colloids Surf B Biointerfaces 2012; 94:107-13. [DOI: 10.1016/j.colsurfb.2012.01.038] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 01/19/2012] [Accepted: 01/19/2012] [Indexed: 12/01/2022]
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Binding of β-amyloid to sulfated sugar residues in a polymer brush. Colloids Surf B Biointerfaces 2012; 93:219-25. [DOI: 10.1016/j.colsurfb.2012.01.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Revised: 01/07/2012] [Accepted: 01/07/2012] [Indexed: 11/23/2022]
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Kitano H, Kondo Y, Saito D, Gemmei-Ide M, Morita H, Kanayama N. Binding of beta-secretase to a peptide inhibitor-carrying SAM. Colloids Surf B Biointerfaces 2010; 78:155-62. [PMID: 20338731 DOI: 10.1016/j.colsurfb.2010.02.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2010] [Revised: 02/18/2010] [Accepted: 02/18/2010] [Indexed: 11/28/2022]
Abstract
A novel disulfide, which carried a specific inhibitor for beta-secretase (KMI360) at both ends, was prepared by the coupling of 11,11'-dithiobisundecanoic acid (DTUA) with the inhibitor. The compound obtained (DTUA-KMI360) formed a self-assembled monolayer (SAM) on a gold electrode as proven by cyclic voltammetry (CV) using hydroquinone as a probe. Furthermore, DTUA-KMI360 could be accumulated as a SAM on a gold colloid deposited on a glass plate (Au colloid-glass chip) as proven by both the red-shift and the increase in absorbance of the gold colloid corresponding to localized surface plasmon resonance (LSPR). When the SAM-modified Au colloid-glass chip was immersed in a solution of aspartyl proteases, pepsin and beta-secretase, the absorbance of the chip at 550nm corresponding to LSPR of the gold colloid further increased and was slightly red-shifted, whereas coexistence of a free inhibitor obstructed these phenomena. Adsorption of the enzymes was promoted by the incorporation of a zwitterionic group into the SAM, while non-specific adsorption to the mixed SAM was significantly reduced. The optimal ratio of omega-zwitterionic alkanethiol, 3-[(6-mercaptohexyl)-N,N-dimethylamino]propane-1-sulfonic acid (C(6)-SPB), and DTUA-KMI360 in the SAM for the binding of enzymes was found to be DTUA-KMI360:C(6)-SPB=1:11 using polarization modulation infrared reflection absorption spectroscopy (PM-IR-RAS). From increasing profiles of absorbance of the Au colloid-glass chip, the association constant (K(assoc)) for pepsin with the inhibitor on the SAM was determined, whereas that for beta-secretase could not be due to the strong binding of the enzyme to the inhibitor, resulting in the absence of the dissociation process. The results suggested that the SAM of the enzyme inhibitor can be used for both investigation of enzymes and removal of target enzymes from biological fluids.
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Affiliation(s)
- Hiromi Kitano
- Department of Applied Chemistry, Graduate School of Science and Engineering, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan.
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Adjémian J, Anne A, Cauet G, Demaille C. Cleavage-sensing redox peptide monolayers for the rapid measurement of the proteolytic activity of trypsin and alpha-thrombin enzymes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:10347-10356. [PMID: 20329721 DOI: 10.1021/la100397g] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Ferrocene (Fc)-labeled peptides are end-grafted onto gold electrodes via a flexible polyethylene glycol (PEG) linker, and their ability to act as substrates for proteolytic enzymes trypsin and alpha-thrombin is investigated by cyclic voltammetry. It is shown that whereas a short Fc-tetrapeptide substrate is rapidly cleaved by trypsin, a longer Fc-heptapeptide substrate is required for alpha-thrombin detection. However, in both cases it is observed that not all of the Fc-peptide chains present on the electrode surface are cleavable by the proteases and that the cleavage yield is actually controlled by the surface coverage in the Fc-peptide. Surface dilution of the Fc-peptide using a backfilling molecule such as MCH (6-mercapto-1-hexanol) was required to obtain a cleavage yield larger than 80%. The kinetics of Fc-peptide cleavage by trypsin or alpha-thrombin is then shown to be adequately described by Michaelis Menten kinetics, allowing enzymatic constants k(cat) and K(M) to be determined. The obtained rate constant values showed that the affinity of the enzymes for their respective Fc-peptide substrates is very high (i.e., low K(M) values) whereas that for the cleavage step itself is relatively low (low k(cat) values). Partial compensation of these parameters yields a fast response of the Fc-peptide electrodes to the proteases in solution in the 1-1000 nM range. The type of molecule used to backfill the Fc-peptide layers, either MCH or PEG(6) chains, is shown to modulate the activity of the proteases versus the Fc-peptide layers: in particular, the PEG(6) diluent is specifically shown to decrease the ability of alpha-thrombin to cleave its Fc-peptide substrate whereas trypsin activity is unaffected by the presence of PEG chains.
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Affiliation(s)
- Jocelyne Adjémian
- HORIBA Medical Parc Euromédecine, rue du Caducée, BP7290 34184 Montpellier Cedex 4, France
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Frisk ML, Tepp WH, Johnson EA, Beebe DJ. Self-assembled peptide monolayers as a toxin sensing mechanism within arrayed microchannels. Anal Chem 2009; 81:2760-7. [PMID: 19253949 PMCID: PMC2760437 DOI: 10.1021/ac802707u] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A sensor for the lethal bacterial enzyme, botulinum neurotoxin type A (BoNT/A), was developed using self-assembled monolayers (SAMs). SAMs consisting of an immobilized synthetic peptide that mimicked the toxin's in vivo SNAP-25 protein substrate were formed on Au and interfaced with arrayed microfluidic channels. Efforts to optimize SAM composition and assay conditions for greatest reaction efficiency and sensitivity are described in detail. Channel design provided facile fluid manipulation, sample incubation, analyte concentration, and fluorescence detection all within a single microfluidic channel, thus avoiding sample transfer and loss. Peptide SAMs were exposed to varying concentrations of BoNT/A or its catalytic light chain (ALC), resulting in enzymatic cleavage of the peptide substrate from the surface. Fluorescence detection was achieved down to 20 pg/mL ALC and 3 pg/mL BoNT/A in 3 h. Toxin sensing was also accomplished in vegetable soup, demonstrating practicality of the method. The modular design of this microfluidic SAM platform allows for extension to sensing other toxins that operate via enzymatic cleavage, such as the remaining BoNT serotypes B-G, anthrax, and tetanus toxin.
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Affiliation(s)
- Megan L. Frisk
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - William H. Tepp
- Department of Food Microbiology and Toxicology, Department of Bacteriology, University of Wisconsin, Madison, Wisconsin 53706
| | - Eric A. Johnson
- Department of Food Microbiology and Toxicology, Department of Bacteriology, University of Wisconsin, Madison, Wisconsin 53706
| | - David J. Beebe
- Department of Biomedical Engineering, University of Wisconsin, Madison, Wisconsin 53706
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Kitano H, Takahashi Y, Mizukami K, Matsuura K. Kinetic study on the binding of lectin to mannose residues in a polymer brush. Colloids Surf B Biointerfaces 2009; 70:91-7. [DOI: 10.1016/j.colsurfb.2008.12.016] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2008] [Accepted: 12/07/2008] [Indexed: 11/26/2022]
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Wu F, Hu Z, Xu J, Tian Y, Wang L, Xian Y, Jin L. Immobilization of horseradish peroxidase on self-assembled (3-mercaptopropyl)trimethoxysilane film: Characterization, direct electrochemistry, redox thermodynamics and biosensing. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2008.06.031] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Park JY, Lee YS, Kim BH, Park SM. Label-free detection of antibody-antigen interactions on (R)-lipo-diaza-18-crown-6 self-assembled monolayer modified gold electrodes. Anal Chem 2008; 80:4986-93. [PMID: 18505271 DOI: 10.1021/ac8002374] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Novel (R)-diaza-18-crown-6 has been prepared by a simple two-step synthetic method and characterized for its ability to form a uniform self-assembled monolayer (SAM) on gold as well as to immobilize proteins using atomic force microscopy, quartz crystal microbalance, and electrochemical impedance spectroscopy (EIS) experiments. The (R)-lipo-diaza-18-crown-6 was shown to form a well-defined SAM on gold, which subsequently captures the antibody (Ab) molecules that in turn capture the antigen (Ag) molecules. The Ab molecules studied include antibody C-reactive protein (Ab-CRP) and antibody ferritin (Ab-ferritin) along with their Ag's, i.e., CRP and ferritin. Quantitative detection of the Ab-Ag interactions was accomplished by EIS experiments with a Fe(CN)6(3-/4-) redox probe present. The ratios of the charge-transfer resistances for the redox probe on the SAM-antibody-covered electrode to those with the antigen molecules attached show an excellent linearity for log[Ag] with lower detection limits than those of other SAMs for the electrochemical sensing of proteins.
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Affiliation(s)
- Jin-Young Park
- Department of Chemistry, Pohang University of Science and Technology, Pohang, Gyeongbuk 790-784, Korea
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Kitano H, Nakada H, Mizukami K. Interaction of wheat germ agglutinin with an N-acetylglucosamine-carrying telomer brush accumulated on a colloidal gold monolayer. Colloids Surf B Biointerfaces 2008; 61:17-24. [PMID: 17681457 DOI: 10.1016/j.colsurfb.2007.06.028] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2007] [Revised: 06/26/2007] [Accepted: 06/26/2007] [Indexed: 11/24/2022]
Abstract
A disulfide-carrying telomer with many pendent N-acetylglucosamine (GlcNAc) residues (Cys-PMHGlcNAc) was obtained by photo-polymerization of 1-(6'-methacryloylaminohexyl)-2-N-acetoamido-2-deoxy d-glucopyranoside) (MHGlcNAc) using a benzyl N,N-diethyldithiocarbamoyl (BDC) derivative that shows abilities of initiation, transfer, and termination (iniferter). The disulfide-carrying telomer was accumulated on a monolayer of colloidal Au on a glass substrate, and the interaction of wheat germ agglutinin (WGA) with GlcNAc residue at the polymer brush-solution interface was examined by using the localized surface plasmon resonance (LSPR) technique. For comparison, an amphiphile carrying many pendent GlcNAc residues was also prepared with MHGlcNAc and a lipophilic radical initiator and was incorporated in a phospholipid liposome to examine interaction of the GlcNAc residue with WGA on the liposome surface using turbidity measurements. Both the colloidal gold optical device and the liposome showed a concentration-dependent specific binding of WGA, and the GlcNAc-carrying liposome had a detection limit of 100 nM for WGA, whereas that of the colloidal gold device was 10nM. The sugar-carrying telomer-coated device examined here is not only useful as a simple biosensor chip but is also expected to expand our knowledge of bio-related phenomena at the liquid-telomer brush interfaces on a colloidal Au.
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Affiliation(s)
- Hiromi Kitano
- Department of Applied Chemistry, Graduate School of Science and Engineering, University of Toyama, Toyama, Japan.
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Matsuura K, Ohno K, Kagaya S, Kitano H. Carboxybetaine Polymer-Protected Gold Nanoparticles: High Dispersion Stability and Resistance against Non-Specific Adsorption of Proteins. MACROMOL CHEM PHYS 2007. [DOI: 10.1002/macp.200600652] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Zhang HX, Chen Q, Wen R, Hu JS, Wan LJ. Effect of Polycyclic Aromatic Hydrocarbons on Detection Sensitivity of Ultratrace Nitroaromatic Compounds. Anal Chem 2007; 79:2179-83. [PMID: 17269652 DOI: 10.1021/ac0618268] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) with different numbers of pi-electrons and geometric symmetry of pi-systems, including anthracene, phenanthrene, pyrene, triphenylene, perylene, benzo[ghi]perylene, and coronene, were chosen to modify glassy carbon electrodes (GCEs) by self-assembling. The self-assembled monolayer of PAHs was investigated by STM and was used in the electrochemical detection of nitroaromatic compounds (NACs). The results indicate that PAH-modified GCE shows higher sensitivity to NACs than an unmodified one. Among the seven different PAHs, coronene-modified GCE exhibits the highest sensitivity to 2,4,6-trinitrotoluene and 1,3,5-trinitrobenzene.
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Kerman K, Mahmoud KA, Kraatz HB. An electrochemical approach for the detection of HIV-1 protease. Chem Commun (Camb) 2007:3829-31. [DOI: 10.1039/b707140j] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Kitano H, Anraku Y, Shinohara H. Sensing Capabilities of Colloidal Gold Monolayer Modified with a Phenylboronic Acid-Carrying Polymer Brush. Biomacromolecules 2006; 7:1065-71. [PMID: 16602722 DOI: 10.1021/bm050782u] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A dithiolated random copolymer with pendent phenylboronic acid residues [Cys-poly(3-acrylamidophenylboronic acid-co-N,N-dimethylaminopropyl methacrylamide), Cys-poly(APBA-co-DMAPMA)] that shows the abilities of initiation, transfer, and termination (iniferter) was obtained by using a benzyl N,N-diethyldithiocarbamoyl (BDC) derivative. The obtained disulfide-carrying copolymer was accumulated on a colloidal gold-immobilized glass substrate, and the usefulness of the polymer brush as a sensing element for glycoproteins such as ovalbumin (OVA) was examined by UV-visible spectrophotometry with the help of localized surface plasmon resonance (LSPR). The sensor showed a concentration-dependent binding of OVA with a detection limit of 100 nM, and it had a very high stability at high ionic strength. The sensor chip could be used for a detection of another glycoprotein, avidin, as well. Furthermore, the binding of biotin-modified human serum albumin (biotinylated HSA) to the avidin-phenylboronic acid- (PBA-) carrying polymer brush complex and further specific binding of anti-HSA immunoglobulin G to the biotinylated HSA-avidin-PBA-carrying polymer brush ternary complex could clearly be observed. The polymer-brush-coated device examined here not only was useful as a simple sensor chip, but also is expected to open a new perspective on interfacial phenomena performed by various functional polymer brushes fixed to colloidal gold on glass substrates.
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Affiliation(s)
- Hiromi Kitano
- Department of Chemical and Biochemical Engineering, University of Toyama, Toyama, 930-8555 Japan.
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