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Xiao W, Xiong Y, Li Y, Chen Z, Li H. Non-Enzymatically Colorimetric Bilirubin Sensing Based on the Catalytic Structure Disruption of Gold Nanocages. SENSORS (BASEL, SWITZERLAND) 2023; 23:s23062969. [PMID: 36991679 PMCID: PMC10053977 DOI: 10.3390/s23062969] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 03/03/2023] [Accepted: 03/06/2023] [Indexed: 06/12/2023]
Abstract
As an essential indicator of liver function, bilirubin is of great significance for clinical diagnosis. A non-enzymatic sensor has been established for sensitive bilirubin detection based on the bilirubin oxidation catalyzed by unlabeled gold nanocages (GNCs). GNCs with dual-localized surface plasmon resonance (LSPR) peaks were prepared by a one-pot method. One peak around 500 nm was ascribed to gold nanoparticles (AuNPs), and the other located in the near-infrared region was the typical peak of GNCs. The catalytic oxidation of bilirubin by GNCs was accompanied by the disruption of cage structure, releasing free AuNPs from the nanocage. This transformation changed the dual peak intensities in opposite trend, and made it possible to realize the colorimetric sensing of bilirubin in a ratiometric mode. The absorbance ratios showed good linearity to bilirubin concentrations in the range of 0.20~3.60 μmol/L with a detection limit of 39.35 nM (3σ, n = 3). The sensor exhibited excellent selectivity for bilirubin over other coexisting substances. Bilirubin in real human serum samples was detected with recoveries ranging from 94.5 to 102.6%. The method for bilirubin assay is simple, sensitive and without complex biolabeling.
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Affiliation(s)
- Wenxiang Xiao
- School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin 541004, China
- Guangxi Colleges and Universities Key Laboratory of Biomedical Sensing and Intelligent Instrument, Guilin University of Electronic Technology, Guilin 541004, China
| | - Yinan Xiong
- School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin 541004, China
| | - Yaoxin Li
- School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin 541004, China
| | - Zhencheng Chen
- School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin 541004, China
- Guangxi Colleges and Universities Key Laboratory of Biomedical Sensing and Intelligent Instrument, Guilin University of Electronic Technology, Guilin 541004, China
| | - Hua Li
- School of Life and Environmental Sciences, Guilin University of Electronic Technology, Guilin 541004, China
- Guangxi Colleges and Universities Key Laboratory of Biomedical Sensing and Intelligent Instrument, Guilin University of Electronic Technology, Guilin 541004, China
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Chowdhury NK, Choudhury R, Gogoi B, Chang CM, Pandey RP. Microbial synthesis of gold nanoparticles and their application. Curr Drug Targets 2022; 23:752-760. [PMID: 35088666 DOI: 10.2174/1389450123666220128152408] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 07/02/2021] [Accepted: 07/27/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND Nanoparticles play a very important role in our daily lives and have a wide range of applications in agriculture and the field of biology such as antioxidants and antimicrobial compounds. Among them are gold nanoparticles (AuNPs) that are highly complex and widely used. In recent years gold nanoparticles have attracted much attention because of their optical properties, electronic, physicochemical and surface Plasmon resonance (SPR). Gold plated nanoparticles, similar to metal nanoparticles, have many unusual chemical and physical properties due to the effects of their quantum size and location, compared to other iron or metal atoms. Gold nanoparticles can be used in pharmaceutical products such as antimicrobial and anti-biofilm agents, targeted delivery of anti-cancer drugs, biosensors, biocatalysis, bioremediation modification of toxic chemicals exposing the soil and atmosphere, dye reduction etc. Yet such methods are expensive and out of harmony with nature. In that account the microbes mediated synthesis of gold nanoparticles changed rapidly recently when pure microbes are ac-friendly, non-toxic and bio compatible as physiological and chemical methods. This document aims to review the progress made in recent years with the fusion of gold nanoparticles. Microbial source includes bacteria, algae fungi. These works motivate the people for how to apply and synthesize of gold nanoparticles. This review also focuses on the process of classification of gold nanoparticles, structures and their use in the development of various requirements. OBJECTIVE The main goal is to study about the gold nanoparticles and their application in future. METHODS We study different research paper, review paper from "Google Scholar", "NCBI", "PubMed", "Science Direct" and then we making our review paper. CONCLUSION Metal nanoparticles are suitable for many emerging technologies. Understanding the microorganisms found in nature because the fusion of gold nanoparticles is required.
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Affiliation(s)
| | - Reshma Choudhury
- Department of Biotechnology, Royal Global University, Guwahati, Assam, India
| | - Bhoirob Gogoi
- Department of Microbiology, Assam University, Silchar, Assam, India
| | - Chung-Ming Chang
- Master & Ph.D. program in Biotechnology Industry, Chang Gung University, No.259, Wenhua 1st Rd., Guishan Dist
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Tsivileva O, Pozdnyakov A, Ivanova A. Polymer Nanocomposites of Selenium Biofabricated Using Fungi. Molecules 2021; 26:3657. [PMID: 34203966 PMCID: PMC8232642 DOI: 10.3390/molecules26123657] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 06/10/2021] [Accepted: 06/12/2021] [Indexed: 12/13/2022] Open
Abstract
Nanoparticle-reinforced polymer-based materials effectively combine the functional properties of polymers and unique characteristic features of NPs. Biopolymers have attained great attention, with perspective multifunctional and high-performance nanocomposites exhibiting a low environmental impact with unique properties, being abundantly available, renewable, and eco-friendly. Nanocomposites of biopolymers are termed green biocomposites. Different biocomposites are reported with numerous inorganic nanofillers, which include selenium. Selenium is a micronutrient that can potentially be used in the prevention and treatment of diseases and has been extensively studied for its biological activity. SeNPs have attracted increasing attention due to their high bioavailability, low toxicity, and novel therapeutic properties. One of the best routes to take advantage of SeNPs' properties is by mixing these NPs with polymers to obtain nanocomposites with functionalities associated with the NPs together with the main characteristics of the polymer matrix. These nanocomposite materials have markedly improved properties achieved at low SeNP concentrations. Composites based on polysaccharides, including fungal beta-glucans, are bioactive, biocompatible, biodegradable, and have exhibited an innovative potential. Mushrooms meet certain obvious requirements for the green entity applied to the SeNP manufacturing. Fungal-matrixed selenium nanoparticles are a new promising biocomposite material. This review aims to give a summary of what is known by now about the mycosynthesized selenium polymeric nanocomposites with the impact on fungal-assisted manufactured ones, the mechanisms of the involved processes at the chemical reaction level, and problems and challenges posed in this area.
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Affiliation(s)
- Olga Tsivileva
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, 13 Prospekt Entuziastov, 410049 Saratov, Russia
| | - Alexander Pozdnyakov
- A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky St., 664033 Irkutsk, Russia; (A.P.); (A.I.)
| | - Anastasiya Ivanova
- A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky St., 664033 Irkutsk, Russia; (A.P.); (A.I.)
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Kolodin AN, Korostova IV, Maksimovskiy EA, Arymbaeva AT, Bulavchenko AI. The Study of the Dispersity of Gold Aerosols with the Use of Au–AOT Composite Films. COLLOID JOURNAL 2020. [DOI: 10.1134/s1061933x20050099] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Dykman LA, Khlebtsov NG. Methods for chemical synthesis of colloidal gold. RUSSIAN CHEMICAL REVIEWS 2019. [DOI: 10.1070/rcr4843] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ultrasensitive and recyclable superstructure of Au SiO2@Ag wire for surface-enhanced Raman scattering detection of thiocyanate in urine and human serum. Anal Chim Acta 2019; 1049:179-187. [DOI: 10.1016/j.aca.2018.10.040] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 10/12/2018] [Accepted: 10/18/2018] [Indexed: 11/17/2022]
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García-Figueroa A, Pena-Pereira F, Lavilla I, Bendicho C. Speciation of gold nanoparticles and total gold in natural waters: A novel approach based on naked magnetite nanoparticles in combination with ascorbic acid. Talanta 2019; 193:176-183. [DOI: 10.1016/j.talanta.2018.09.092] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 09/21/2018] [Accepted: 09/24/2018] [Indexed: 01/09/2023]
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Prabhawathi V, Sivakumar PM, Boobalan T, Manohar CM, Doble M. Design of antimicrobial polycaprolactam nanocomposite by immobilizing subtilisin conjugated Au/Ag core-shell nanoparticles for biomedical applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 94:656-665. [DOI: 10.1016/j.msec.2018.10.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 09/16/2018] [Accepted: 10/03/2018] [Indexed: 02/03/2023]
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Kawde AN, Aziz MA, El-Zohri M, Baig N, Odewunmi N. Cathodized Gold Nanoparticle-Modified Graphite Pencil Electrode for Non-Enzymatic Sensitive Voltammetric Detection of Glucose. ELECTROANAL 2017. [DOI: 10.1002/elan.201600709] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Abdel-Nasser Kawde
- Chemistry Department; King Fahd University of Petroleum and Minerals; Dhahran 31261 Kingdom of Saudi Arabia
| | - Md. Abdul Aziz
- Center of Excellence of Nanotechnology; King Fahd University of Petroleum and Minerals; Dhahran 31261 Kingdom of Saudi Arabia
| | - Manal El-Zohri
- Botany & Microbiology Department; Faculty of Science, Assiut University; Assiut 71516 Egypt
- Biological Sciences Department, Faculty of Science; King Abdulaziz University; Jeddah 21589 Kingdom of Saudi Arabia
| | - Nadeem Baig
- Chemistry Department; King Fahd University of Petroleum and Minerals; Dhahran 31261 Kingdom of Saudi Arabia
| | - Nurudeen Odewunmi
- Chemistry Department; King Fahd University of Petroleum and Minerals; Dhahran 31261 Kingdom of Saudi Arabia
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Siddiqi KS, Husen A. Fabrication of Metal Nanoparticles from Fungi and Metal Salts: Scope and Application. NANOSCALE RESEARCH LETTERS 2016; 11:98. [PMID: 26909778 PMCID: PMC4766161 DOI: 10.1186/s11671-016-1311-2] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 02/15/2016] [Indexed: 05/18/2023]
Abstract
Fungi secrete enzymes and proteins as reducing agents which can be used for the synthesis of metal nanoparticles from metal salts. Large-scale production of nanoparticles from diverse fungal strains has great potential since they can be grown even in vitro. In recent years, various approaches have been made to maximize the yield of nanoparticles of varying shape, size, and stability. They have been characterized by thermogravimetric analysis, X-ray diffractometry, SEM/TEM, zeta potential measurements, UV-vis, and Fourier transform infrared (FTIR) spectroscopy. In this review, we focus on the biogenic synthesis of metal nanoparticles by fungi to explore the chemistry of their formation extracellularly and intracellularly. Emphasis has been given to the potential of metal nanoparticles as an antimicrobial agent to inhibit the growth of pathogenic fungi, and on other potential applications.
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Affiliation(s)
| | - Azamal Husen
- Department of Biology, College of Natural and Computational Sciences, University of Gondar, P.O. Box #196, Gondar, Ethiopia.
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Ibrahim AM, Abd El-Lat MM, Selim MM. Effect of Polyethyleneimine Stabilizer on Size and Morphology of Gold Nanoparticles. ASIAN JOURNAL OF APPLIED SCIENCES 2016; 9:178-184. [DOI: 10.3923/ajaps.2016.178.184] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
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13
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Xiao X, Bai B, Xu N. Dual-wavelength extinction method for fast sizing of metal nanosphere ensembles. APPLIED OPTICS 2015; 54:7160-7168. [PMID: 26368748 DOI: 10.1364/ao.54.007160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We propose a simple dual-wavelength extinction (DWE) method to measure the average size of spherical metal nanoparticle (NP) ensembles. Unlike the spectroscopic methods that need to measure the full spectra of scattering and/or extinction to retrieve the NP size, the DWE method can estimate the NP size by measuring the light extinction at only two properly selected wavelengths and thus is useful for fast sizing of metal NP ensembles. The influences of the NP shape deviation and ensemble dispersancy on the measurement accuracy are analyzed and discussed in detail. An empirical correction procedure is established to compensate these influences to further improve accuracy. The feasibility and reliability of the DWE method are corroborated by experimentally measuring several typical gold spherical NP ensembles and comparing the results with those obtained by three other standard methods. The experimental results indicate satisfactory accuracy of the DWE method for measuring gold NPs from 30 to 100 nm by using two measurement wavelengths of 532 and 573 nm. The studies show that the DWE method is efficient, reliable, and easy to implement. It may find wide applications in the metrology of NPs.
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Salazar-González JA, González-Ortega O, Rosales-Mendoza S. Gold nanoparticles and vaccine development. Expert Rev Vaccines 2015; 14:1197-211. [DOI: 10.1586/14760584.2015.1064772] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Jorge Alberto Salazar-González
- Laboratorio de Biofarmacéuticos Recombinantes, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, SLP, 78210, México
| | - Omar González-Ortega
- Laboratorio de Biofarmacéuticos Recombinantes, Facultad de Ciencias Químicas, Universidad Autónoma de San Luis Potosí, Av. Dr. Manuel Nava 6, SLP, 78210, México
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Szparaga R, Woodward CE, Forsman J. On the stability of aqueous dispersions containing conducting colloidal particles. SOFT MATTER 2015; 11:4011-4021. [PMID: 25899056 DOI: 10.1039/c5sm00161g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We use a combination of simulations and a simple theoretical approach to investigate interactions between neutral conducting surfaces, immersed in an electrolyte solution. The study is conducted at the primitive model level, which necessitates the use of multiple image reflections. Our approximate theory is based on a classical density functional formulation of Poisson-Boltzmann theory. The same approach can in principle also be imported to more advanced treatments, where ion correlations are accounted for. An important limiting result that guides our treatment of the image forces, is that the repulsive salt-induced interactions cancel the attractive zero frequency van der Waals attraction at long range. That is, at vanishing frequency, the van der Waals interaction between the conducting surfaces is, at large separations, perfectly screened by the intervening salt solution. The simulations are computationally intensive, due to a strong dependence upon the number of image reflections used, with especially poor convergence when an odd number of images is used. We demonstrate that our approximate density functional approach is remarkably accurate, even in the presence of a 2 : 1 salt, or when the surfaces preferentially adsorb one ion species. The former observation was rather unexpected, given the lack of ion correlations within our mean-field treatment, and is most likely due to a cancellation between two opposing effects, both of which are generated by ion correlations.
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Affiliation(s)
- Ryan Szparaga
- Theoretical Chemistry, Lund University, P.O. Box 124, S-221 00 Lund, Sweden.
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16
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Kawde AN, Aziz M, Baig N, Temerk Y. A facile fabrication of platinum nanoparticle-modified graphite pencil electrode for highly sensitive detection of hydrogen peroxide. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.01.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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17
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Bishnoi S, Goyal RN, Shim YB. A novel nanogold–single wall carbon nanotube modified sensor for the electrochemical determination of 8-hydroxyguanine, a diabetes risk biomarker. Bioelectrochemistry 2014; 99:24-9. [DOI: 10.1016/j.bioelechem.2014.06.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Revised: 05/21/2014] [Accepted: 06/04/2014] [Indexed: 11/17/2022]
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18
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Biofabrication of gold nanoparticles and its biocompatibility in human breast adenocarcinoma cells (MCF-7). J IND ENG CHEM 2014. [DOI: 10.1016/j.jiec.2013.08.021] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Shedbalkar U, Singh R, Wadhwani S, Gaidhani S, Chopade BA. Microbial synthesis of gold nanoparticles: current status and future prospects. Adv Colloid Interface Sci 2014; 209:40-8. [PMID: 24456802 DOI: 10.1016/j.cis.2013.12.011] [Citation(s) in RCA: 145] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 12/24/2013] [Accepted: 12/24/2013] [Indexed: 01/08/2023]
Abstract
Gold nanoparticles have been employed in biomedicine since the last decade because of their unique optical, electrical and photothermal properties. Present review discusses the microbial synthesis, properties and biomedical applications of gold nanoparticles. Different microbial synthesis strategies used so far for obtaining better yield and stability have been described. It also includes different methods used for the characterization and analysis of gold nanoparticles, viz. UV-visible spectroscopy, Fourier transform infrared spectroscopy, X ray diffraction spectroscopy, scanning electron microscopy, ransmission electron microscopy, atomic force microscopy, electron dispersive X ray, X ray photoelectron spectroscopy and cyclic voltametry. The different mechanisms involved in microbial synthesis of gold nanoparticles have been discussed. The information related to applications of microbially synthesized gold nanoparticles and patents on microbial synthesis of gold nanoparticles has been summarized.
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Affiliation(s)
- Utkarsha Shedbalkar
- Department of Microbiology, University of Pune, Pune 411007, Maharashtra, India
| | - Richa Singh
- Department of Microbiology, University of Pune, Pune 411007, Maharashtra, India
| | - Sweety Wadhwani
- Department of Microbiology, University of Pune, Pune 411007, Maharashtra, India
| | - Sharvari Gaidhani
- Institute of Bioinformatics and Biotechnology (IBB), University of Pune, Pune 411007, Maharashtra, India
| | - B A Chopade
- Department of Microbiology, University of Pune, Pune 411007, Maharashtra, India.
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Njagi JI, Goia DV. Nitrilotriacetic acid: A novel reducing agent for synthesizing colloidal gold. J Colloid Interface Sci 2014; 421:27-32. [DOI: 10.1016/j.jcis.2014.01.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Revised: 01/18/2014] [Accepted: 01/20/2014] [Indexed: 01/18/2023]
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Luo Z, Smith JC, Goff TM, Adair JH, Castleman A. Gold cluster coatings enhancing Raman scattering from surfaces: Ink analysis and document identification. Chem Phys 2013. [DOI: 10.1016/j.chemphys.2013.06.021] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Gold nanoparticle-modified graphite pencil electrode for the high-sensitivity detection of hydrazine. Talanta 2013; 115:214-21. [PMID: 24054582 DOI: 10.1016/j.talanta.2013.04.038] [Citation(s) in RCA: 128] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Revised: 04/16/2013] [Accepted: 04/17/2013] [Indexed: 11/20/2022]
Abstract
A novel gold nanoparticle-modified graphite pencil electrode (AuNP-GPE) is prepared just by immersing a bare GPE in AuNP solution, followed by heating for 15 min. The bare and modified GPEs are characterized by FE-SEM imaging and cyclic voltammetry. The AuNP-GPEs showed excellent electrocatalytic activities with respect to hydrazine oxidation, with good reproducibility. To reduce the quantification and detection limits, and increase the hydrazine sensitivity, the pH and square wave voltammetry parameters are optimized. A square wave voltammetry study as a function of the hydrazine concentration showed that the AuNP-GPE detector's quantification limit was 100 nmol L(-1) hydrazine, much lower than the value obtained using amperometry (10 µmol L(-1)). The limits of detection (at 3σ) for hydrazine sensing at AuNP-GPEs using square wave voltammetry and amperometry were 42 nmol L(-1) and 3.07 µmol L(-1). Finally, the modified electrode was used to determine the hydrazine concentration in drinking water, and satisfactory results are obtained. This simple, rapid, low-cost method for fabricating a modified electrode is an attractive approach to the development of new sensors.
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Nanomolar amperometric sensing of hydrogen peroxide using a graphite pencil electrode modified with palladium nanoparticles. Mikrochim Acta 2013. [DOI: 10.1007/s00604-013-1000-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Sevonkaev I, Privman V, Goia D. Synthesis of dispersed metal particles for applications in photovoltaics, catalysis, and electronics. J Solid State Electrochem 2012. [DOI: 10.1007/s10008-012-1954-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Jun H, Fabienne T, Florent M, Coulon PE, Nicolas M, Olivier S. Understanding of the size control of biocompatible gold nanoparticles in millifluidic channels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:15966-15974. [PMID: 23116539 DOI: 10.1021/la303439f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The size control of gold nanoparticles synthesized in surfactant free water with a continuous flow mode was elucidated and used to produce higher concentration (3 mM) of stabilized gold nanoparticles. The originality of the synthesis was to finely modulate the initial pH of the reducing agent instead of the gold precursor to modify the kinetic of the reaction. The acceleration of the kinetic (~1 s) prevents the modification of the gold precursors ensuring the control of the final size (from 3 to 25 nm) of the nanoparticles with a low polydispersity for aqueous surfactant free solution. The accurate measure of the size distribution by small angle X-ray scattering was combined to the use of a model based on the coupling of nucleation and growth equations together with a progressive injection of monomers. The results on the final state show that the size of the nanoparticles is indeed controlled by the kinetic of reduction of gold atoms. A millifluidic setup equipped with a homemade mixer offers a robust way of rapid mixing to obtain a reproducible production of large amounts of nanoparticles.
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Affiliation(s)
- Han Jun
- CEA Saclay, DSM/IRAMIS/SIS2M/LIONS, UMR CEA/CNRS 3299, 91191 Gif sur Yvette, France
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Zhou J, Tang D, Hou L, Cui Y, Chen H, Chen G. Nanoplatinum-enclosed gold nanocores as catalytically promoted nanolabels for sensitive electrochemical immunoassay. Anal Chim Acta 2012; 751:52-8. [DOI: 10.1016/j.aca.2012.09.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Revised: 08/31/2012] [Accepted: 09/04/2012] [Indexed: 11/16/2022]
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Lu L, Burkey G, Halaciuga I, Goia DV. Core-shell gold/silver nanoparticles: synthesis and optical properties. J Colloid Interface Sci 2012; 392:90-95. [PMID: 23127875 DOI: 10.1016/j.jcis.2012.09.057] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 08/27/2012] [Accepted: 09/26/2012] [Indexed: 10/27/2022]
Abstract
Highly dispersed gold-silver core-shell nanoparticles were synthesized in a two-step process. The stabilizer-free gold core particles with an average diameter of ~30 nm were first precipitated by rapid reduction of HAuCl(4) with l-ascorbic acid. Thin continuous silver shells of variable thickness were subsequently obtained by reducing controlled amounts of silver nitrate added in the gold sol. The plasmon band of gold gradually blue-shifted and a peak characteristic for silver eventually emerged as the amount of deposited silver increased. A strong and well-defined silver absorption band was recorded when the Ag content exceeded 60 wt.%. It is shown that the concentration of Cl(-) ions in the gold precursor solution plays a critical role in the stability of the bi-metallic sol and the structure of the deposited silver shell.
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Affiliation(s)
- Lu Lu
- Center for Advanced Materials Processing, Clarkson University, Potsdam, NY 13699-5814, USA
| | - Gwendolyn Burkey
- Center for Advanced Materials Processing, Clarkson University, Potsdam, NY 13699-5814, USA
| | - Ionel Halaciuga
- Center for Advanced Materials Processing, Clarkson University, Potsdam, NY 13699-5814, USA
| | - Dan V Goia
- Center for Advanced Materials Processing, Clarkson University, Potsdam, NY 13699-5814, USA.
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Deposition of continuous platinum shells on gold nanoparticles by chemical precipitation. J Colloid Interface Sci 2012; 369:91-5. [DOI: 10.1016/j.jcis.2011.11.068] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2011] [Revised: 11/23/2011] [Accepted: 11/24/2011] [Indexed: 11/19/2022]
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Effect of surface modification of indium tin oxide by nanoparticles on the electrochemical determination of tryptophan. Talanta 2011; 85:2626-31. [DOI: 10.1016/j.talanta.2011.08.031] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Revised: 08/15/2011] [Accepted: 08/15/2011] [Indexed: 11/21/2022]
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30
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Tanaka A, Hashimoto K, Kominami H. Gold and Copper Nanoparticles Supported on Cerium(IV) Oxide-A Photocatalyst Mineralizing Organic Acids under Red Light Irradiation. ChemCatChem 2011. [DOI: 10.1002/cctc.201100158] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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Kim JH, Lavin BW, Burnett RD, Boote BW. Controlled synthesis of gold nanoparticles by fluorescent light irradiation. NANOTECHNOLOGY 2011; 22:285602. [PMID: 21642758 DOI: 10.1088/0957-4484/22/28/285602] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A novel photochemical synthesis of size-controlled gold nanoparticles was reliably accomplished via both a direct reduction and a seeded-growth method at room temperature under the irradiation of fluorescent light. These methods utilized the intensity of fluorescent light that closely resembles daily sunlight (∼100 mW cm(-2)). This effectively allowed for the formation of gold nanoparticles with tunable sizes simply by controlling the concentration of trisodium citrate and gold chloride. The broad band fluorescent light was found to be an efficient source for inducing the formation of gold nanoparticles at ambient conditions. The size distribution and absorption property of the resulting nanoparticles were thoroughly characterized by scanning/transmission electron microscopy, dynamic light scattering, UV-visible spectroscopy and powder x-ray diffraction. This photochemical synthesis demonstrates, for the first time, the reliable preparation of gold nanoparticles at room temperature upon irradiation with fluorescent light.
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Affiliation(s)
- Jun-Hyun Kim
- Department of Chemistry, Illinois State University, Normal, IL 61790-4160, USA.
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32
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Goyal RN, Rana ARS, Aziz MA, Oyama M. Effect of gold nanoparticle attached multi-walled carbon nanotube-layered indium tin oxide in monitoring the effect of paracetamol on the release of epinephrine. Anal Chim Acta 2011; 693:35-40. [DOI: 10.1016/j.aca.2011.03.026] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2011] [Revised: 03/07/2011] [Accepted: 03/09/2011] [Indexed: 11/30/2022]
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33
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Boca S, Rugina D, Pintea A, Barbu-Tudoran L, Astilean S. Flower-shaped gold nanoparticles: synthesis, characterization and their application as SERS-active tags inside living cells. NANOTECHNOLOGY 2011; 22:055702. [PMID: 21178234 DOI: 10.1088/0957-4484/22/5/055702] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The detection of Raman signals inside living cells is a topic of great interest in the study of cell biology mechanisms and for diagnostic and therapeutic applications. This work presents the synthesis and characterization of flower-shaped gold nanoparticles and demonstrates their applicability as SERS-active tags for cellular spectral detection. The particles were synthesized by a facile, rapid new route that uses ascorbic acid as a reducing agent of gold salt. Two triarylmethane dyes which are widely used as biological stains, namely malachite green oxalate and basic fuchsin, were used as Raman-active molecules and the polymer mPEG-SH as capping material. The as-prepared SERS-active nanoparticles were tested on a human retinal pigment epithelial cell line and found to present a low level of cytotoxicity and high chemical stability together with SERS sensitivity down to picomolar particle concentrations.
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Affiliation(s)
- Sanda Boca
- Nanobiophotonics Center, Institute for Interdisciplinary Research in Nanobioscience, Babes-Bolyai University, Cluj-Napoca, Romania.
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34
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Kang HJ, Patra S, Das J, Aziz A, Jo J, Yang H. Effect of aging on the electrocatalytic activity of gold nanoparticles. Electrochem commun 2010. [DOI: 10.1016/j.elecom.2010.06.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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36
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Optical and structural properties of protein/gold hybrid bio-nanofilms prepared by layer-by-layer method. Colloids Surf B Biointerfaces 2010; 79:276-83. [DOI: 10.1016/j.colsurfb.2010.04.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2010] [Accepted: 04/14/2010] [Indexed: 11/17/2022]
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37
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Martin MN, Basham JI, Chando P, Eah SK. Charged gold nanoparticles in non-polar solvents: 10-min synthesis and 2D self-assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:7410-7. [PMID: 20392108 DOI: 10.1021/la100591h] [Citation(s) in RCA: 179] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We report a fast and highly reproducible chemical synthesis method for colloidal gold nanoparticles which are negatively charged in nonpolar solvents and coated with hydrophobic organic molecules. If a hexane droplet containing charged gold nanoparticles is mixed with a larger toluene droplet, nanoparticles immediately float to the air-toluene interface and form a close-packed monolayer film. After evaporation of the solvent molecules, the monolayer film of nanoparticles can be deposited to any substrate without any limit in size. The synthesis does not require a postsynthesis cleaning step, since the two immiscible liquid phases separate the reaction byproducts from gold nanoparticles and a minimal amount of coating molecules is used.
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Affiliation(s)
- Matthew N Martin
- Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
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38
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Spirin MG, Brichkin SB, Razumov VF. Specifics of the preparation of anisotropically shaped gold nanoparticles in triton X-100 reverse micelles. HIGH ENERGY CHEMISTRY 2010. [DOI: 10.1134/s001814391001008x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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39
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Kowalska E, Mahaney OOP, Abe R, Ohtani B. Visible-light-induced photocatalysis through surface plasmon excitation of gold on titania surfaces. Phys Chem Chem Phys 2010; 12:2344-55. [DOI: 10.1039/b917399d] [Citation(s) in RCA: 454] [Impact Index Per Article: 32.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Gorshkov V, Zavalov A, Privman V. Shape selection in diffusive growth of colloids and nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:7940-7953. [PMID: 19485361 DOI: 10.1021/la900613p] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report numerical investigations of a 3D model of diffusive growth of fine particles, the internal structure of which corresponds to different crystal lattices. A growing cluster (particle) is immersed in and exchanges monomer building blocks with a surrounding medium of diffusing (off-lattice) monomers. On-surface dynamics of the latter is accounted for by allowing, in addition to detachment, monomer motion to the neighboring vacant crystal sites, according to probabilistic rules mimicking local thermalization. The key new feature of our model is the focus on the growth of a single cluster, emerging as a crystalline core, without development of defects that can control large-scale growth modes. This single, defect-free core growth is imposed by the specific dynamic rules assumed. Our results offer a possible explanation of the experimentally observed shape uniformity (i.e., fixed, approximately evenly sized proportions) in the synthesis of uniform colloids and nanoparticles. We demonstrate the basic principles of well-defined particle shape emergence in such growth. Specifically, several shapes are possible for a given crystal structure. The formation of shapes that follow the crystal symmetry and are uniform can be a result of the nonequilibrium nature of the growth process. The shape of a growing particle can be controlled by varying the relative rates of kinetic processes as well as by adjusting the concentration of monomers in the surrounding medium.
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Affiliation(s)
- Vyacheslav Gorshkov
- Institute of Physics, National Academy of Sciences, 46 Nauky Avenue, Kiev 680028, Ukraine
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41
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Preparation and stabilization of monodisperse colloidal gold by reduction with aminodextran. J Colloid Interface Sci 2009; 335:62-9. [DOI: 10.1016/j.jcis.2009.02.053] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2009] [Accepted: 02/26/2009] [Indexed: 11/18/2022]
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42
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Graf P, Mantion A, Foelske A, Shkilnyy A, Masić A, Thünemann AF, Taubert A. Peptide-coated silver nanoparticles: synthesis, surface chemistry, and pH-triggered, reversible assembly into particle assemblies. Chemistry 2009; 15:5831-44. [PMID: 19370744 DOI: 10.1002/chem.200802329] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Simple tripeptides are scaffolds for the synthesis and further assembly of peptide/silver nanoparticle composites. Herein, we further explore peptide-controlled silver nanoparticle assembly processes. Silver nanoparticles with a pH-responsive peptide coating have been synthesized by using a one-step precipitation/coating route. The nature of the peptide/silver interaction and the effect of the peptide on the formation of the silver particles have been studied via UV/Vis, X-ray photoelectron, and surface-enhanced Raman spectroscopies as well as through electron microscopy, small angle X-ray scattering and powder X-ray diffraction with Rietveld refinement. The particles reversibly form aggregates of different sizes in aqueous solution. The state of aggregation can be controlled by the solution pH value. At low pH values, individual particles are present. At neutral pH values, small clusters form and at high pH values, large precipitates are observed.
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Affiliation(s)
- Philipp Graf
- Department of Chemistry, Klingelbergstrasse 80, University of Basel, 4056 Basel, Switzerland
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43
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He F, Liu J, Roberts CB, Zhao D. One-Step “Green” Synthesis of Pd Nanoparticles of Controlled Size and Their Catalytic Activity for Trichloroethene Hydrodechlorination. Ind Eng Chem Res 2009. [DOI: 10.1021/ie801962f] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Feng He
- Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, Alabama 36849, and Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849
| | - Juncheng Liu
- Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, Alabama 36849, and Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849
| | - Christopher B. Roberts
- Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, Alabama 36849, and Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849
| | - Dongye Zhao
- Environmental Engineering Program, Department of Civil Engineering, Auburn University, Auburn, Alabama 36849, and Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849
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44
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Sau TK, Urban AS, Dondapati SK, Fedoruk M, Horton MR, Rogach AL, Stefani FD, Rädler JO, Feldmann J. Controlling loading and optical properties of gold nanoparticles on liposome membranes. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2009.04.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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45
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Kowalska E, Abe R, Ohtani B. Visible light-induced photocatalytic reaction of gold-modified titanium(iv) oxide particles: action spectrum analysis. Chem Commun (Camb) 2009:241-3. [DOI: 10.1039/b815679d] [Citation(s) in RCA: 356] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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46
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Khlebtsov NG. Determination of Size and Concentration of Gold Nanoparticles from Extinction Spectra. Anal Chem 2008; 80:6620-5. [DOI: 10.1021/ac800834n] [Citation(s) in RCA: 214] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nikolai G. Khlebtsov
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, 13 Prospekt Entuziastov, Saratov 410049, Russia, and Saratov State University, 83 Ulitsa Astrakhanskaya, Saratov 410026, Russia
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47
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Andreescu S, Luck LA. Studies of the binding and signaling of surface-immobilized periplasmic glucose receptors on gold nanoparticles: A glucose biosensor application. Anal Biochem 2008; 375:282-90. [DOI: 10.1016/j.ab.2007.12.035] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2007] [Revised: 12/23/2007] [Accepted: 12/24/2007] [Indexed: 11/16/2022]
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48
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Kannan P, Abraham John S. Synthesis of mercaptothiadiazole-functionalized gold nanoparticles and their self-assembly on Au substrates. NANOTECHNOLOGY 2008; 19:085602. [PMID: 21730726 DOI: 10.1088/0957-4484/19/8/085602] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Gold nanoparticles (AuNPs) stabilized with mercaptothiadiazole ligands, 2,5-dimercapto-1,3,4-thiadiazole (DMT), 5-amino-2-mercapto-1,3,4-thiadiazole (AMT) and 5-methyl-2-mercapto-1,3,4-thiadiazole (MMT), were prepared by the reaction of the respective ligands with HAuCl(4) and NaBH(4) in an aqueous medium. TEM images show that the average size of AuNPs was 6.5 ± 0.5 nm, irrespective of the capping ligands. The colloidal solution of both DMT-capped AuNPs (DMT-AuNPs) and AMT-capped AuNPs (AMT-AuNPs) were highly stable for several months. However, several changes were noticed for MMT-capped AuNPs (MMT-AuNPs) after 2 h from its formation. The SPR band intensity at 518 nm decreases and the narrow SPR absorption band slowly changes into a flat absorption pattern with a broad peak from 518 to 1000 nm which was accompanied by a colour change of the solution from red to purple and then blue and thereafter unchanged. The TEM image of MMT-AuNPs after 96 h shows that most of the spherical shape of the AuNPs assembled to form a nanowire-like structure. The observed changes may be due to the absence of a strong stabilizing force on the surface of the MMT-AuNPs. The amino and thiolate groups on the surface of the AMT-AuNPs and DMT-AuNPs, respectively, were directly self-assembled on Au electrodes. They exhibit excellent electrocatalytic activity towards the oxidation of AA by enhancing its oxidation current twice in addition to more than 200 mV negative shift in the oxidation potential in contrast to bare Au electrode.
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Affiliation(s)
- Palanisamy Kannan
- Department of Chemistry, Gandhigram Rural University, Dindigul, Gandhigram 624 302, India
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49
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Ionita P, Volkov A, Jeschke G, Chechik V. Lateral Diffusion of Thiol Ligands on the Surface of Au Nanoparticles: An Electron Paramagnetic Resonance Study. Anal Chem 2007; 80:95-106. [DOI: 10.1021/ac071266s] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Petre Ionita
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK, and Max Planck Institute for Polymer Research, Postfach 3148, 55021 Mainz, Germany
| | - Aleksei Volkov
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK, and Max Planck Institute for Polymer Research, Postfach 3148, 55021 Mainz, Germany
| | - Gunnar Jeschke
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK, and Max Planck Institute for Polymer Research, Postfach 3148, 55021 Mainz, Germany
| | - Victor Chechik
- Department of Chemistry, University of York, Heslington, York YO10 5DD, UK, and Max Planck Institute for Polymer Research, Postfach 3148, 55021 Mainz, Germany
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50
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Kogan MJ, Olmedo I, Hosta L, Guerrero AR, Cruz LJ, Albericio F. Peptides and metallic nanoparticles for biomedical applications. Nanomedicine (Lond) 2007; 2:287-306. [PMID: 17716175 DOI: 10.2217/17435889.2.3.287] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
In this review, we describe the contribution of peptides to the biomedical applications of metallic nanoparticles. We also discuss strategies for the preparation of peptide-nanoparticle conjugates and the synthesis of the peptides and metallic nanoparticles. An overview of the techniques used for the characterization of the conjugates is also provided. Mainly for biomedical purposes, metallic nanoparticles conjugated to peptides have been prepared from Au and iron oxide (magnetic nanoparticles). Peptides with the capacity to penetrate the plasma membrane are used to deliver nanoparticles to the cell. In addition, peptides that recognize specific cell receptors are used for targeting nanoparticles. The potential application of peptide-nanoparticle conjugates in cancer and Alzheimer's disease therapy is discussed. Several peptide-nanoparticle conjugates show biocompatibility and present a low degree of cytotoxicity. Furthermore, several peptide-metallic nanoparticle conjugates are used for in vitro diagnosis.
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Affiliation(s)
- Marcelo J Kogan
- Departamento de Química Farmacológica y Toxicológica de la Facultad de Ciencias Químicas y Farmacéuticas, Casilla 233, Universidad de Chile, Olivos, Independencia, Santiago, Chile.
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