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Fu J, Mao Y, Han J, Zhang P, Tan Y, Hu J, Seeberger PH, Yin J. A nitric oxide and hydrogen sulfide dual-donating nanosystem for highly synergistic gas-radiotherapy against hepatocellular carcinoma. BIOMATERIALS ADVANCES 2022; 144:213209. [PMID: 36473350 DOI: 10.1016/j.bioadv.2022.213209] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 11/11/2022] [Accepted: 11/19/2022] [Indexed: 11/27/2022]
Abstract
A drug delivery system (DDS) based on gold-capped mesoporous silica nanoparticles (MSN) is fabricated for loading NOSH-aspirin, a nitric oxide (NO) and hydrogen sulfide (H2S) dual-donating cytotoxic molecule. The liver targeting and tumor microenvironment responsive properties of the nanosystem enable, for the first time, the concurrent delivery of NO and H2S from a DDS into hepatocellular carcinoma (HCC) cells. Combined gas-radiotherapy (GT-RT) from drug-loaded DDS (NOSH@MSN-Au-Gal) and X-ray irradiation shows highly synergistic anti-cancer activity against both normoxic and hypoxic HCC cells. Further studies revealed that the combined GT-RT not only retains the well-known anticancer mechanism of NO, H2S, and X-ray individually, but also alleviates HCC hypoxia via NO- and H2S- involved unique pathways. In mice, the GT-RT greatly slows the growth of both subcutaneous and orthotopic HCC tumors and shows high biocompatibility. The current work is expected to promote the clinical application of combined GT-RT as an effective cancer treatment.
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Affiliation(s)
- Junjie Fu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, PR China
| | - Yong Mao
- Department of Oncology, Affiliated Hospital of Jiangnan University, Wuxi 214062, PR China
| | - Jing Han
- School of Chemistry & Materials Science, Jiangsu Normal University, Xuzhou 221116, PR China
| | - Pengfei Zhang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, PR China; Department of Oncology, Affiliated Hospital of Jiangnan University, Wuxi 214062, PR China
| | - Yunying Tan
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, PR China
| | - Jing Hu
- Wuxi School of Medicine, Jiangnan University, Wuxi 214122, PR China
| | - Peter H Seeberger
- Biomolecular Systems Department, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, Potsdam 14476, Germany
| | - Jian Yin
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, PR China.
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2
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Shiue A, Chen JH, Chang CY, Chang SM, Hwa KY, Chin KY, Leggett G. Synthesis and cytotoxic analysis of thiolated xylose derivatives decorated on gold nanoparticles. ACTA ACUST UNITED AC 2020; 28:e00549. [PMID: 33240795 PMCID: PMC7674290 DOI: 10.1016/j.btre.2020.e00549] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 10/20/2020] [Accepted: 10/29/2020] [Indexed: 11/29/2022]
Abstract
Nanoparticles covered with carbohydrates constitute a good bio-mimetic model. D-xylose gold nanoparticles with linkages of alkyl or polyethylene glycol synthesized via D-xylosethiols. Forming self-assembled monolayers on gold nanoparticles. The potential use of intact or thiolated xylose derivatives decorated on AuNPs.
The rapid development of metal nanoparticles capped by an organic monolayer offers the possibility to create a whole new variety of products with novel characteristic, functions and applications. Among these, nanoparticles covered with carbohydrates (glyconanoparticles) constitute a good bio-mimetic model of carbohydrate presentation at the cell surface and are currently centered on many glycobiological and biomedical applications. In this study, a series of novel D-xylose gold nanoparticles (AuNPs) with linkages of alkyl or polyethylene glycol have been synthesized via D-xylosethiols, forming self-assembled monolayers on gold nanoparticles. The nano-gold solution, two carbohydrate derivatives and modified nano-gold solution were tested for cytotoxicity to check the biocompatibility. The MTT assay on NIH 3T3 cell lines confirmed that all the test materials showed no toxicity with the more than 90 % of cell viability in both low concentration (1 μM) and high concentration (100 μM), compared with the control.
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Affiliation(s)
- Angus Shiue
- Graduate Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan
| | - Jenn-Han Chen
- Graduate Institute of Clinical Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chia-Ying Chang
- Graduate Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan
| | - Shu-Mei Chang
- Graduate Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan.,Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei, Taiwan.,Research and Development Center for Smart Textile Technology, National Taipei University of Technology, Taipei, Taiwan
| | - Kuo-Yuan Hwa
- Graduate Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan.,Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei, Taiwan.,Center for Biomedical Industry, National Taipei University of Technology, Taipei, Taiwan
| | - Kai-Yen Chin
- Graduate Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan
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3
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Preparation, characterization and stability assessment of keratin and albumin functionalized gold nanoparticles for biomedical applications. APPLIED NANOSCIENCE 2020. [DOI: 10.1007/s13204-020-01250-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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4
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Ranjani B, Pandian K, Kumar GA, Gopinath S. D-glucosamine chitosan base molecule-assisted synthesis of different shape and sized silver nanoparticles by a single pot method: A greener approach for sensor and microbial applications. Int J Biol Macromol 2019; 133:1280-1287. [DOI: 10.1016/j.ijbiomac.2019.04.196] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 04/20/2019] [Accepted: 04/30/2019] [Indexed: 11/30/2022]
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5
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Yang L, Yin T, Liu Y, Sun J, Zhou Y, Liu J. Gold nanoparticle-capped mesoporous silica-based H 2O 2-responsive controlled release system for Alzheimer's disease treatment. Acta Biomater 2016; 46:177-190. [PMID: 27619837 DOI: 10.1016/j.actbio.2016.09.010] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2016] [Revised: 09/05/2016] [Accepted: 09/08/2016] [Indexed: 12/17/2022]
Abstract
Metal ions promote Alzheimer's disease (AD) pathogenesis by accelerating amyloid-β (Aβ) aggregation and inducing formation of neurotoxic reactive oxygen species (ROS) such as hydrogen peroxide (H2O2). Although metal chelators can block these effects, their therapeutic potential is marred by their inability to cross the blood-brain barrier (BBB) and by their non-specific interactions with metal ions necessary for normal cellular processes, which could result in adverse side effects. To overcome these limitations, we created a novel gold nanoparticle-capped mesoporous silica (MSN-AuNPs) based H2O2-responsive controlled release system for targeted delivery of the metal chelator CQ. In this system, CQ is released only upon exposure to conditions in which H2O2 levels are high, such as those in Aβ plaques. The conjugation of AuNPs on the surface of MSN did not affect their ability to cross the BBB. The AuNPs also help in decrease the Aβ self-assembly, due to this, MSN-CQ-AuNPs were more efficient than MSN-CQ in inhibiting Cu2+-induced Aβ40 aggregation. Furthermore, MSN-CQ-AuNPs reduced the cell membrane disruption, microtubular defects and ROS-mediated apoptosis induced by Aβ40-Cu2+ complexes. The high BBB permeability, efficient anti-Aβ aggregation, and good biocompatibility of MSN-CQ-AuNPs, together with the specific conditions necessary for its release of CQ, demonstrate its potential for future biomedical applications. STATEMENT OF SIGNIFICANCE Due to the low ability to cross the blood-brain barrier (BBB) and non-specific interactions with metal ions necessary for normal cellular processes of metal chelator or Aβ inhibitors, we created a novel gold nanoparticle-capped mesoporous silica (MSN-AuNPs)-based H2O2-responsive controlled release system for targeted delivery of the metal chelator CQ and AuNPs (Aβ inhibitor). In this system, CQ and AuNPs are released only upon exposure to conditions in which H2O2 levels are high, such as those in Aβ plaques. The AuNPs on the surface of MSN also help in decrease the Aβ self-assembly, due to this, MSN-CQ-AuNPs were more efficient than MSN-CQ in inhibiting Cu2+-induced Aβ40 aggregation. Furthermore, MSN-CQ-AuNPs reduced the cell membrane disruption, microtubular defects and ROS-mediated apoptosis induced by Aβ40-Cu2+ complexes. Our data suggest that this controlled release system may have widespread application in the field of medicine for Alzheimer's disease.
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Wang JS, Wai CM, Brown GJ, Apt SD. Two-Dimensional Nanoparticle Cluster Formation in Supercritical Fluid CO2. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:4635-4642. [PMID: 27088712 DOI: 10.1021/acs.langmuir.6b01011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Supercritical fluid carbon dioxide (sc-CO2) is capable of depositing nanoparticles in small structures of silicon substrates because of its gas-like penetration, liquid-like solvation abilities, and near-zero surface tension. In nanometer-sized shallow wells on silicon surface, formation of two-dimensional (2D) monolayer metal nanoparticle (NP) clusters can be achieved using the sc-CO2 deposition method. Nanoparticles tend to fill nanostructured holes first, and then, if sufficient nanoparticles are available, they will continue to cover the flat areas nearby, unless defects or other surface imperfections are available. In addition, SEM images of two-dimensional gold (Au) nanoparticle clusters formed on a flat silicon surface with two to a dozen or more of the nanoparticles are provided to illustrate the patterns of nanoparticle cluster formation in sc-CO2.
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Affiliation(s)
- Joanna S Wang
- Materials and Manufacturing Directorate, Air Force Research Laboratory , Wright-Patterson Air Force Base, Ohio 45433-7707, United States
| | - Chien M Wai
- Department of Chemistry, University of Idaho , Renfrew Hall, Moscow, Idaho 83844, United States
| | - Gail J Brown
- Materials and Manufacturing Directorate, Air Force Research Laboratory , Wright-Patterson Air Force Base, Ohio 45433-7707, United States
| | - Scott D Apt
- Materials and Manufacturing Directorate, Air Force Research Laboratory , Wright-Patterson Air Force Base, Ohio 45433-7707, United States
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7
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Wang JS, Ullrich B, Das A, Wai CM, Brown GJ, Dass CK, Hendrickson JR. Luminescence studies for energy transfer of lead sulfide QD films. RSC Adv 2016. [DOI: 10.1039/c6ra03632e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
PbS QDs of different sizes are deposited with supercritical fluid CO2 to form laterally uniform PbS QD films as compared to other deposition methods. Luminescence studies show FRET process and different transient life times.
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Affiliation(s)
- Joanna S. Wang
- Air Force Research Laboratory
- Materials and Manufacturing Directorate
- WPAFB
- USA
| | - Bruno Ullrich
- Air Force Research Laboratory
- Materials and Manufacturing Directorate
- WPAFB
- USA
| | - Anirban Das
- Department of Chemistry
- University of Idaho
- Moscow
- USA
| | - Chien M. Wai
- Department of Chemistry
- University of Idaho
- Moscow
- USA
| | - Gail J. Brown
- Air Force Research Laboratory
- Materials and Manufacturing Directorate
- WPAFB
- USA
| | - Chandriker K. Dass
- Air Force Research Laboratory
- Sensors Directorate
- WPAFB
- USA
- Wyle Laboratories
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8
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Su L, Wang C, Polzer F, Lu Y, Chen G, Jiang M. Glyco-Inside Micelles and Vesicles Directed by Protection-Deprotection Chemistry. ACS Macro Lett 2014; 3:534-539. [PMID: 35590719 DOI: 10.1021/mz500211v] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Protection-deprotection of carbohydrate is often required in the preparation of glycopolymers, which causes an obvious polarity change of the polymers, but it has been neglected in the studies of self-assembly. In this paper, a new strategy for self-assembly of sugar-containing block copolymers is suggested based on the protection-deprotection chemistry. We found that deacetylation of a series of block copolymers of PS-b-PManAc (PS, polystyrene block; PManAc, "sugar block" with acetylated α-mannopyranoside side groups) in THF resulted in glyco-inside structures of the deprotected copolymer PS-b-PMan, i.e., vesicles with a sugar wall and micelles with a sugar core. Besides, vesicle-to-micelle transition of the assemblies with decreasing the relative length of the sugar block was observed. These unique glyco-inside assemblies show interesting functions, such as generating homogeneous Au nanoparticles within the layer of the glyco-block from AuCl4- without any additional reducing reagents or energy input. Control experiments prove that the polar layer of glyco-polymer inside the vesicle provides an essential reduction environment.
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Affiliation(s)
- Lu Su
- The
State Key Laboratory of Molecular Engineering of Polymers and Department
of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - Chenmeng Wang
- The
State Key Laboratory of Molecular Engineering of Polymers and Department
of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - Frank Polzer
- TEM
Group, Institute of Physics, Humboldt-Universität zu Berlin, 12489 Berlin, Germany
| | - Yan Lu
- Soft
Matter and Functional Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany
| | - Guosong Chen
- The
State Key Laboratory of Molecular Engineering of Polymers and Department
of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - Ming Jiang
- The
State Key Laboratory of Molecular Engineering of Polymers and Department
of Macromolecular Science, Fudan University, Shanghai 200433, China
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9
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Tharion J, Satija J, Mukherji S. Glucose mediated synthesis of gold nanoshells: A facile and eco-friendly approach conferring high colloidal stability. RSC Adv 2014. [DOI: 10.1039/c3ra45815f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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10
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You J, Hu H, Zhou J, Zhang L, Zhang Y, Kondo T. Novel cellulose polyampholyte-gold nanoparticle-based colorimetric competition assay for the detection of cysteine and mercury(II). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:5085-5092. [PMID: 23527619 DOI: 10.1021/la3050913] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We provide a highly sensitive and selective assay to detect cysteine (Cys) and Hg(2+) in aqueous solutions using Au nanoparticles (NPs) stabilized by carboxylethyl quaternized cellulose (CEQC). This method is based on the thiophilicity of Hg(2+) and Au NPs as well as the unique optical properties of CEQC-stabilized Au NPs. CEQC chains are good stabilizing agents for Au NPs even in a high-salt solution. The addition of Cys results in the aggregation of CEQC-stabilized Au NPs, which induces the visible color change and obvious redshift in UV-visible absorption spectra. On the other hand, Hg(2+) is more apt to interact with thiols than Au NPs; thus, it can remove the Cys and trigger Au NP aggregate redispersion again. By taking advantage of this mechanism, a novel off-on colorimetric sensor has been established for Cys and Hg(2+) detection. This new assay could selectively detect Cys and Hg(2+) with the detection limits as low as 20 and 40 nM in aqueous solutions, respectively.
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Affiliation(s)
- Jun You
- Department of Chemistry, Wuhan University, Wuhan 430072, China
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11
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Gold Nanoparticles and Nanocomposites in Clinical Diagnostics Using Electrochemical Methods. ACTA ACUST UNITED AC 2013. [DOI: 10.1155/2013/535901] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Progress and development in clinical diagnostics certainly focus upon the advances in the nanomaterials, particularly gold nanoparticles (AuNPs) that offer promise to solve the biocompatible and sensitive detection systems. This paper focuses on the recent application of AuNPs in clinical diagnosis. Various important methods of AuNPs synthesis and their application in clinical detection of various biomolecules using electrochemical detection methods have been described. AuNPs alone and in various composites are also described based on the various biosensors design recently published for the detection of cancer biomarkers, proteins, bacteria, and cancer cells. The effect of AuNPs type and size in clinical detection has also been briefly illustrated.
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12
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Zhao J, Yang S, Yang S. Controllable one-step synthesis of CuO, Cu2O and Cu. CRYSTAL RESEARCH AND TECHNOLOGY 2012. [DOI: 10.1002/crat.201200189] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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13
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Ionic liquids supported on magnetic nanoparticles as a sorbent preconcentration material for sulfonylurea herbicides prior to their determination by capillary liquid chromatography. Anal Bioanal Chem 2012; 404:1529-38. [DOI: 10.1007/s00216-012-6221-2] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Revised: 06/11/2012] [Accepted: 06/20/2012] [Indexed: 10/28/2022]
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14
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Von White G, Chen Y, Roder-Hanna J, Bothun GD, Kitchens CL. Structural and thermal analysis of lipid vesicles encapsulating hydrophobic gold nanoparticles. ACS NANO 2012; 6:4678-85. [PMID: 22632177 DOI: 10.1021/nn2042016] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The structure and stability of hybrid lipid vesicles containing bilayer-encapsulated hydrophobic nanoparticles is dependent upon lipid phase behavior. By embedding stearylamine-stabilized gold nanoparticles in dipalmitoylphosphatidylcholine/dipalmitoylphosphatidylglycerol vesicles, we show that encapsulation at lipid to nanoparticle ratios from 10,000:1 to 5000:1 leads to bilayer thickening and hydrophobic mismatch, favoring nanoparticle inclusion in gel phase vesicles. High loadings lead to large increases in the gel to fluid melting temperature upon heating and significant hysteresis on cooling, which cannot be attributed solely to excess free ligand. This behavior is due to a cooperative effect of excess free SA ligand and nanoparticle embedment. Nanoparticle clustering was observed during lipid melting and could be reversed upon lipid freezing owing to lateral capillary forces within the bilayer. The impact of nanoparticle embedment on vesicle structure and properties at such low concentrations is reminiscent of hydrophobic proteins, suggesting that the underlying lipid biophysics between proteins and nanoparticle are similar and may provide a predictive design tool for therapeutic applications.
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Affiliation(s)
- Gregory Von White
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina 29634, USA
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15
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Saunders SR, Roberts CB. Nanoparticle separation and deposition processing using gas expanded liquid technology. Curr Opin Chem Eng 2012. [DOI: 10.1016/j.coche.2011.12.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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16
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Von White G, Provost MG, Kitchens CL. Fractionation of Surface-Modified Gold Nanorods Using Gas-Expanded Liquids. Ind Eng Chem Res 2012. [DOI: 10.1021/ie201975p] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Gregory Von White
- Department of Chemical and Biomolecular Engineering,
Clemson University, Clemson, South Carolina 29634, United States
| | - Matthew Grant Provost
- Department of Chemical and Biomolecular Engineering,
Clemson University, Clemson, South Carolina 29634, United States
| | - Christopher Lawrence Kitchens
- Department of Chemical and Biomolecular Engineering,
Clemson University, Clemson, South Carolina 29634, United States
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Wang JS, Brown GJ, Hung WC, Wai CM. Supercritical Fluid Deposition of Uniform PbS Nanoparticle Films for Energy-Transfer Studies. Chemphyschem 2012; 13:2068-73. [DOI: 10.1002/cphc.201200042] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Revised: 03/01/2012] [Indexed: 11/08/2022]
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18
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Von White G, Kerscher P, Brown RM, Morella JD, McAllister W, Dean D, Kitchens CL. Green Synthesis of Robust, Biocompatible Silver Nanoparticles Using Garlic Extract. JOURNAL OF NANOMATERIALS 2012; 2012:730746. [PMID: 24683414 PMCID: PMC3966315 DOI: 10.1155/2012/730746] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
This paper details a facile approach for the synthesis of stable and monodisperse silver nanoparticles performed at ambient/low temperature where Allium sativum (garlic) extract functions as the silver salt reducing agent during nanoparticle synthesis as well as the post-synthesis stabilizing ligands. Varying the synthesis conditions provides control of particle size, size-distribution, and kinetics of particle formation. Infrared spectroscopy, energy dispersive x-ray chemical analysis, and high performance liquid chromatography indicated that the carbohydrates present in the garlic extract are the most likely nanoparticle stabilizing chemistry. The synthesized silver nanoparticles also demonstrate potential for biomeical applications, owing to the 1) enhanced stability in biological media, 2) resistance to oxidation by the addition of H2O2, 3) ease and scalability of synthesis, and 4) lack of harsh chemicals required for synthesis. Cytotoxicity assays indicated no decrease in cellular proliferation for vascular smooth muscle cells and 3T3 fibroblasts at a concentration of 25 μg/ml, confirming that garlic extract prepared silver nanoparticles are ideal candidates for future experimentation and implementation into biomedical applications.
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Affiliation(s)
- Gregory Von White
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC 29634
| | - Petra Kerscher
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC 29634
| | - Ryan M. Brown
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC 29634
| | - Jacob D. Morella
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC 29634
| | | | - Delphine Dean
- Department of Bioengineering, Clemson University, Clemson, SC 29634
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Kesavan S, Revin SB, John SA. Fabrication, characterization and application of a grafting based gold nanoparticles electrode for the selective determination of an important neurotransmitter. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm33013j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Biosynthesis of crystalline silver and gold nanoparticles by extremophilic yeasts. Bioinorg Chem Appl 2011; 2011:546074. [PMID: 21912532 PMCID: PMC3170698 DOI: 10.1155/2011/546074] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Revised: 07/04/2011] [Accepted: 07/11/2011] [Indexed: 11/18/2022] Open
Abstract
The biosynthesis of Ag and Au nanoparticles (NPs) was investigated using an extremophilic yeast strain isolated from acid mine drainage in Portugal. Three distinct studies were performed, namely, the growth of yeast strain in presence of metal ions, the use of yeast biomass for the metal nanoparticles synthesis, and of the supernatant obtained after 24-hour incubation of yeast biomass in water. The extremophilic strain under study was able to grow up to an Ag ion concentration of 1.5 mM whereas an increase of Au ion concentration over 0.09 mM caused a strong inhibitory effect. A successful route for the metal NPs synthesis was obtained using the yeast biomass. When the washed yeast cells were in contact with Ag or Au solutions, AgNPs smaller than 20 nm were produced, as for the AuNPs diameter ranged from 30 to 100 nm, as determined through transmission electron microscopy and confirmed by energy-dispersive X-ray spectra. The supernatant-based strategy provided evidence that proteins were released to the medium by the yeasts, which could be responsible for the formation and stabilisation of the Ag NPs, although the involvement of the cell wall seems fundamental for AuNPs synthesis.
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21
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Yang J, Lee JY, Ying JY. Phase transfer and its applications in nanotechnology. Chem Soc Rev 2011; 40:1672-96. [DOI: 10.1039/b916790k] [Citation(s) in RCA: 194] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Hortigüela MJ, Aranaz I, Gutiérrez MC, Ferrer ML, del Monte F. Chitosan Gelation Induced by the in Situ Formation of Gold Nanoparticles and Its Processing into Macroporous Scaffolds. Biomacromolecules 2010; 12:179-86. [DOI: 10.1021/bm1010883] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- María J. Hortigüela
- Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), Campus of Cantoblanco 28049 Madrid, Spain
| | - Inmaculada Aranaz
- Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), Campus of Cantoblanco 28049 Madrid, Spain
| | - María C. Gutiérrez
- Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), Campus of Cantoblanco 28049 Madrid, Spain
| | - M. Luisa Ferrer
- Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), Campus of Cantoblanco 28049 Madrid, Spain
| | - Francisco del Monte
- Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC), Campus of Cantoblanco 28049 Madrid, Spain
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Niitsoo O, Couzis A. Facile synthesis of silver core - silica shell composite nanoparticles. J Colloid Interface Sci 2010; 354:887-90. [PMID: 21145562 DOI: 10.1016/j.jcis.2010.11.013] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2010] [Revised: 10/21/2010] [Accepted: 11/08/2010] [Indexed: 11/17/2022]
Abstract
Combining metal nanoparticles and dielectrics (e.g. silica) to produce composite materials with high dielectric constant is motivated by application in energy storage. Control over dielectric properties and their uniformity throughout the composite material is best accomplished if the composite is comprised of metal core - dielectric shell structured nanoparticles with tunable dimensions. We have synthesized silver nanoparticles in the range of 40-100nm average size using low concentration of saccharide simultaneously as the reducing agent and electrostatic stabilizer. Coating these silver particles with silica from tetraalkoxysilanes has different outcomes depending on the alcoholic solvent and the silver particle concentration. A common issue in solution-based synthesis of core-shell particles is heterogeneous nucleation whereupon two populations are formed: the desired core-shell particles and undesired coreless particles of the shell material. We report the formation of Ag@SiO(2) core-shell particles without coreless silica particles as the byproduct in 2-propanol. In ethanol, it depends on the silver surface area available whether homogeneous nucleation of silica on silver is achieved. In methanol and 1-butanol, core-shell particles did not form. This demonstrates the significance of controlling the tetraalkoxysilane hydrolysis rate when growing silica shells on silver nanoparticles.
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Affiliation(s)
- Olivia Niitsoo
- Department of Chemical Engineering, The City College of New York, New York, NY 10031, United States
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Liu J, Ruffini N, Pollet P, Llopis-Mestre V, Dilek C, Eckert CA, Liotta CL, Roberts CB. More Benign Synthesis of Palladium Nanoparticles in Dimethyl Sulfoxide and Their Extraction into an Organic Phase. Ind Eng Chem Res 2010. [DOI: 10.1021/ie902013g] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Juncheng Liu
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Nicholas Ruffini
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Pamela Pollet
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Veronica Llopis-Mestre
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Cerag Dilek
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Charles A. Eckert
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Charles L. Liotta
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Christopher B. Roberts
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, and School of Chemical & Biomolecular Engineering, School of Chemistry and Biochemistry, Specialty Separations Center, Georgia Institute of Technology, Atlanta, Georgia 30332
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Mehta S, Chaudhary S, Gradzielski M. Time dependence of nucleation and growth of silver nanoparticles generated by sugar reduction in micellar media. J Colloid Interface Sci 2010; 343:447-53. [DOI: 10.1016/j.jcis.2009.11.053] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2009] [Revised: 11/19/2009] [Accepted: 11/20/2009] [Indexed: 10/20/2022]
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Wang JS, Smetana AB, Boeckl JJ, Brown GJ, Wai CM. Depositing ordered arrays of metal sulfide nanoparticles in nanostructures using supercritical fluid carbon dioxide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:1117-1123. [PMID: 20000595 DOI: 10.1021/la902108s] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Silver sulfide and cadmium sulfide nanoparticles of controllable sizes are synthesized using a water-in-hexane microemulsion method and stabilized by dodecanethiol. The stabilized metal sulfide nanoparticles can be deposited homogenously on flat substrates forming ordered 2-D arrays in supercritical fluid carbon dioxide (Sc-CO(2)). The use of Sc-CO(2) leaves the particles unaffected by dewetting effects caused by traditional solvents and produces uniform arrays. The Sc-CO(2) deposition technique is capable of filling nanoparticles in nanostructures of silicon wafers which is difficult to accomplish by conventional solvent evaporation methods.
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Affiliation(s)
- Joanna S Wang
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844, USA.
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Wang F, Liu Y, Liu CY. Molten salt synthesis and localized surface plasmon resonance study of vanadium dioxide nanopowders. J SOLID STATE CHEM 2009. [DOI: 10.1016/j.jssc.2009.09.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Pallem VL, Stretz HA, Wells MJM. Evaluating aggregation of gold nanoparticles and humic substances using fluorescence spectroscopy. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2009; 43:7531-7535. [PMID: 19848172 DOI: 10.1021/es901201z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The fate and transport of diagnostic gold nanoparticles in surface waters would significantly depend on their interactions with humic substances, which are ubiquitously found in natural aquatic systems. The current study employs UV-visible absorbance and fluorescence spectroscopy to investigate the interactions of commercial humic acid (HA) with gold nanoparticles having a core size of 5 nm and coated with two different stabilizers, beta-D-glucose and citrate. Humic substances (HS) are fluorescent in nature, providing a unique probe of nanometer-scale morphological changes for interactions between these natural polyelectrolytes and water-soluble gold nanoparticles. Quenching of fluorescence intensity was observed with beta-D-glucose-coated gold nanoparticles, whereas an enhancement effect was noticed with the citrate-coated particles when mixed with HA having concentrations of 2 and 8 ppm (surface waters typically may contain approximately 10 ppm HS). Examining the quenching and enhancement of fluorescence provides insight into the structural changes taking place at the coated gold nanoparticle-HA interface. The quenching behavior suggested ligand exchange due to nanometer-scale contact between the HA and beta-D-glucose-coated gold nanoparticles, whereas the enhancement effect with citrate particles would indicate overcoating, leading to increased transfer distances for fluorescence resonance energy transfer.
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Affiliation(s)
- Vasanta L Pallem
- Department of Chemical Engineering, Tennessee Technological University, Cookeville, Tennessee 38505, USA
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Katti KK, Kattumuri V, Bhaskaran S, Katti KV, Kannan R. Facile and General Method for Synthesis of Sugar Coated Gold Nanoparticles. INTERNATIONAL JOURNAL OF GREEN NANOTECHNOLOGY. BIOMEDICINE 2009; 1:B53-B59. [PMID: 20011668 PMCID: PMC2790171 DOI: 10.1080/19430850902983848] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
This letter describes a general method for the preparation of carbohydrate coated gold nanoparticles. The generality of this method has been demonstrated by surface coating AuNPs with the following sugars: glucose (monosaccharide); sucrose, maltose, or lactose (disaccharides); raffinose (trisaccharide); and starch (polysaccharide). The non-toxic, water-soluble phosphino aminoacid P(CH(2)NHCH(CH(3)-)COOH)(3), THPAL, has been used as a reducing agent in this process. The sizes of sugar coated AuNPs that have been generated in this study are: 30 ± 8 nm (Glucose), 10 ± 6 nm (sucrose), 8 ± 2 nm (maltose), 3 ± 1 nm (lactose), 6 ± 2 nm (raffinose), and 39 ± 9 nm (starch).
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Affiliation(s)
- Kavita K. Katti
- Department of Radiology, Rm #106 Alton Bldg Laboratories, 301 Business loop 70W, University of Missouri-Columbia, Columbia, MO-65211
| | - Vijaya Kattumuri
- Department of Physics, Rm #106 Alton Bldg Laboratories, 301 Business loop 70W, University of Missouri-Columbia, Columbia, MO-65211
| | - Sharanya Bhaskaran
- Department of Radiology, Rm #106 Alton Bldg Laboratories, 301 Business loop 70W, University of Missouri-Columbia, Columbia, MO-65211
| | - Kattesh V. Katti
- Department of Chemistry, Rm #106 Alton Bldg Laboratories, 301 Business loop 70W, University of Missouri-Columbia, Columbia, MO-65211
- Department of Physics, Rm #106 Alton Bldg Laboratories, 301 Business loop 70W, University of Missouri-Columbia, Columbia, MO-65211
| | - Raghuraman Kannan
- Department of Radiology, Rm #106 Alton Bldg Laboratories, 301 Business loop 70W, University of Missouri-Columbia, Columbia, MO-65211
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Mayer CR, Dumas E, Sécheresse F. 1,10-Phenanthroline and 1,10-phenanthroline-terminated ruthenium(II) complex as efficient capping agents to stabilize gold nanoparticles: Application for reversible aqueous–organic phase transfer processes. J Colloid Interface Sci 2008; 328:452-7. [DOI: 10.1016/j.jcis.2008.09.041] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2008] [Revised: 09/11/2008] [Accepted: 09/12/2008] [Indexed: 10/21/2022]
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Bhosale PS, Stretz HA. Gold nanoparticle deposition using CO2 expanded liquids: effect of pressure oscillation and surface-particle interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:12241-12246. [PMID: 18828623 DOI: 10.1021/la801618m] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Postsynthesis processing of nanoparticles to obtain mesoscale hierarchal nanostructures is the key for the development of nanotechnology and smart composites/coatings from these materials. We have utilized gas-expanded liquid deposition of alkyl-coated gold nanoparticles to study the effects of variable process flowrates, variable flow oscillation and variable interaction potential of the substrate on nanoparticle array quality. Array quality is measured here as completeness of area surface coverage of approximately a monolayer of nanoparticles. Quantitative values for surface coverage are averages obtained from multiple TEM photomicrographs using Image J digital analysis. The process was modified using higher CO2 addition rate outside of the pressure range necessary for deposition, and this modified process produced an excellent film quality while reducing overall processing time by 45%. The effects of pressure oscillation during deposition appeared to anneal the film at the lower flow rates, 0.5 and 1.0 mL/min, but a reduction in area coverage was observed with pressure oscillation at 3.0 mL/min. Pressure oscillation has emerged as a useful tool for researchers to tune the film uniformity and therefore the surface roughness. Calculations based on Hamaker theories for surface-particle interactions on various substrates were performed, and better surface coverage was predicted for C-based surfaces compared to Si3N4 and SiO2 surfaces. Indeed, experimental studies verified this general ordering, indicating that if surface interactions with the particles are strong deposition directly on the surface rather than on pre-existing nanoparticle islands may govern uniform deposition.
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Affiliation(s)
- Prasad S Bhosale
- Tennessee Technological University, Cookeville, Tennessee 38501, USA
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Guo Y, Yan H. Preparation and Characterization of Heparin‐Stabilized Gold Nanoparticles. J Carbohydr Chem 2008. [DOI: 10.1080/07328300802158752] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Sha Y, Deng C, Liu B. Development of C18-functionalized magnetic silica nanoparticles as sample preparation technique for the determination of ergosterol in cigarettes by microwave-assisted derivatization and gas chromatography/mass spectrometry. J Chromatogr A 2008; 1198-1199:27-33. [PMID: 18533171 DOI: 10.1016/j.chroma.2008.05.049] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2008] [Revised: 05/14/2008] [Accepted: 05/19/2008] [Indexed: 11/18/2022]
Abstract
Ergosterol is one of the important precursors of tumorigenic polynuclear aromatic hydrocarbons. A large amount of ergosterol is present in mildewy cigarettes, which derives from fungal contaminations. In this paper, a novel approach based on C(18)-functionalized magnetic silica nanoparticles (C(18)-f-MS NPs) coupled with microwave-assisted derivatization and gas chromatography/mass spectrometry (GC/MS) was developed for the rapid enrichment and determination of ergosterol in cigarettes. Due to that, microwave-assisted derivatization requires very short time (several minutes), and the extraction and concentration of ergosterol become the key step in the sample preparation process. In this study, the prepared C(18)-f-MS NPs with its unique properties (high surface area and strong magnetism) provided an efficient way for extraction and concentration of ergosterol in the samples. Additionally, the analyte of ergosterol adsorbed with C(18)-f-MS NPs in cigarettes can be simply and rapidly isolated (only about 2s) through placing a strong magnet on the bottom of container. In this work, different parameters such as added amounts of C(18)-f-MS NPs, extraction temperature, and extraction time were optimized to enhance the extraction efficiency. Method validations (linear range, detection limit, precision, and recovery) were also studied. The results obtained by the optimal conditions showed that the proposed method based on C(18)-f-MS NPs was a simple, high efficient, and had a rapid approach for the enrichment of ergosterol in cigarettes and was successfully applied to the analysis of ergosterol in normal and mildewy cigarettes followed by microwave-assisted derivatization and GC/MS.
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Affiliation(s)
- Yunfei Sha
- Shanghai Tobacco (Group) Corp. Technical Center, Shanghai 200082, China
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Anand M, You SS, Hurst KM, Saunders SR, Kitchens CL, Ashurst WR, Roberts CB. Thermodynamic Analysis of Nanoparticle Size Selective Fractionation Using Gas-Expanded Liquids. Ind Eng Chem Res 2008. [DOI: 10.1021/ie070981p] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Madhu Anand
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, Department of Applied Chemical Engineering, Korea University of Technology and Education, Byungcheon-myun, Cheonan-si, Chungcheongnam-do 330-708, Korea, and Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina 29634
| | - Seong-Sik You
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, Department of Applied Chemical Engineering, Korea University of Technology and Education, Byungcheon-myun, Cheonan-si, Chungcheongnam-do 330-708, Korea, and Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina 29634
| | - Kendall M. Hurst
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, Department of Applied Chemical Engineering, Korea University of Technology and Education, Byungcheon-myun, Cheonan-si, Chungcheongnam-do 330-708, Korea, and Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina 29634
| | - Steven R. Saunders
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, Department of Applied Chemical Engineering, Korea University of Technology and Education, Byungcheon-myun, Cheonan-si, Chungcheongnam-do 330-708, Korea, and Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina 29634
| | - Christopher L. Kitchens
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, Department of Applied Chemical Engineering, Korea University of Technology and Education, Byungcheon-myun, Cheonan-si, Chungcheongnam-do 330-708, Korea, and Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina 29634
| | - W. Robert Ashurst
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, Department of Applied Chemical Engineering, Korea University of Technology and Education, Byungcheon-myun, Cheonan-si, Chungcheongnam-do 330-708, Korea, and Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina 29634
| | - Christopher B. Roberts
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, Department of Applied Chemical Engineering, Korea University of Technology and Education, Byungcheon-myun, Cheonan-si, Chungcheongnam-do 330-708, Korea, and Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina 29634
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Liu J, He F, Durham E, Zhao D, Roberts CB. Polysugar-stabilized Pd nanoparticles exhibiting high catalytic activities for hydrodechlorination of environmentally deleterious trichloroethylene. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:328-336. [PMID: 18044944 DOI: 10.1021/la702731h] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In this paper, we present a straightforward and environmentally friendly aqueous-phase synthesis of small Pd nanoparticles (approximately 2.4 nm under the best stabilization) by employing a "green", inexpensive, and biodegradable/biocompatible polysugar, sodium carboxymethylcellulose (CMC), as a capping agent. The Pd nanoparticles exhibited rather high catalytic activity (observed pseudo-first-order reaction kinetic rate constant, k(obs), is up to 828 L g(-1) min(-1)) for the hydrodechlorination of environmentally deleterious trichloroethene (TCE) in water. Fourier transform IR (FT-IR) spectra indicate that CMC molecules interact with the Pd nanoparticles via both carboxyl (-COO-) and hydroxyl (-OH) groups, thereby functioning to passivate the surface and suppress the growth of the Pd nanoparticles. Hydrodechlorination of TCE using differently sized CMC-capped Pd nanoparticles as catalyst was systematically investigated in this work. Both the catalytic activity (k(obs)) and the surface catalytic activity (turnover frequency, TOF) of these CMC-capped Pd nanoparticles for TCE degradation are highly size-dependent. This point was further verified by a comparison of the catalytic activities and surface catalytic activities of CMC-capped Pd nanoparticles with those of beta-D-glucose-capped Pd and neat Pd nanoparticles for TCE degradation.
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Affiliation(s)
- Juncheng Liu
- Department of Chemical Engineering and Department of Civil Engineering, Auburn University, Auburn, AL 36849, USA
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Anand M, Odom LA, Roberts CB. Finely controlled size-selective precipitation and separation of CdSe/ZnS semiconductor nanocrystals using CO2-gas-expanded liquids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:7338-43. [PMID: 17511487 DOI: 10.1021/la700325z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A technique was developed to size-selectively separate polydisperse dispersions of CdSe/ZnS nanocrystals into distinct color fractions using only the tunable solvent properties of CO2-expanded hexane. This size-selective precipitation of semiconductor nanoparticles is achieved by finely tuning the solvent strength of the CO2/hexane medium by simply adjusting the applied CO2 pressure. These subtle changes affect the balance between osmotic repulsive and van der Waals attractive forces, thereby allowing fractionation of the nanocrystals into multiple narrow size populations.
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Affiliation(s)
- Madhu Anand
- Department of Chemical Engineering, Auburn University, Auburn, AL 36849, USA
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Affiliation(s)
- Jennifer A Dahl
- Department of Chemistry and Materials Science Institute, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, USA
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Affiliation(s)
- Philip G Jessop
- Department of Chemistry, Queen's University, Kingston, Ontario, Canada K7L 3N6. jessop@ chem.queensu.ca
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Tarmyshov KB, Müller-Plathe F. Interface between platinum(111) and liquid isopropanol (2-propanol): A model for molecular dynamics studies. J Chem Phys 2007; 126:074702. [PMID: 17328622 DOI: 10.1063/1.2472357] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A molecular dynamics model and its parametrization procedure are devised and used to study adsorption of isopropanol on platinum(111) (Pt(111)) surface in unsaturated and oversaturated coverages regimes. Static and dynamic properties of the interface between Pt(111) and liquid isopropanol are also investigated. The magnitude of the adsorption energy at unsaturated level increases at higher coverages. At the oversaturated coverage (multilayer adsorption) the adsorption energy reduces, which coincides with findings by Panja et al. in their temperature-programed desorption experiment [Surf. Sci. 395, 248 (1998)]. The density analysis showed a strong packing of molecules at the interface followed by a depletion layer and then by an oscillating density profile up to 3 nm. The distribution of individual atom types showed that the first adsorbed layer forms a hydrophobic methyl "brush." This brush then determines the distributions further from the surface. In the second layer methyl and methine groups are closer to the surface and followed by the hydroxyl groups; the third layer has exactly the inverted distribution. The alternating pattern extends up to about 2 nm from the surface. The orientational structure of molecules as a function of distance of molecules is determined by the atom distribution and surprisingly does not depend on the electrostatic or chemical interactions of isopropanol with the metal surface. However, possible formation of hydrogen bonds in the first layer is notably influenced by these interactions. The surface-adsorbate interactions influence the mobility of isopropanol molecules only in the first layer. Mobility in the higher layers is independent of these interactions.
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Affiliation(s)
- Konstantin B Tarmyshov
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Petersenstrasse 20, 64287 Darmstadt, Germany.
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Vohs JK, Fahlman BD. Advances in the controlled growth of nanoclusters using a dendritic architecture. NEW J CHEM 2007. [DOI: 10.1039/b616472m] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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