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Composite Coatings of Chitosan and Silver Nanoparticles Obtained by Galvanic Deposition for Orthopedic Implants. Polymers (Basel) 2022; 14:polym14183915. [PMID: 36146057 PMCID: PMC9504697 DOI: 10.3390/polym14183915] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 09/06/2022] [Accepted: 09/12/2022] [Indexed: 01/18/2023] Open
Abstract
In this work, composite coatings of chitosan and silver nanoparticles were presented as an antibacterial coating for orthopedic implants. Coatings were deposited on AISI 304L using the galvanic deposition method. In galvanic deposition, the difference of the electrochemical redox potential between two metals (the substrate and a sacrificial anode) has the pivotal role in the process. In the coupling of these two metals a spontaneous redox reaction occurs and thus no external power supply is necessary. Using this process, a uniform deposition on the exposed area and a good adherence of the composite coating on the metallic substrate were achieved. Physical-chemical characterizations were carried out to evaluate morphology, chemical composition, and the presence of silver nanoparticles. These characterizations have shown the deposition of coatings with homogenous and porous surface structures with silver nanoparticles incorporated and distributed into the polymeric matrix. Corrosion tests were also carried out in a simulated body fluid at 37 °C in order to simulate the same physiological conditions. Corrosion potential and corrosion current density were obtained from the polarization curves by Tafel extrapolation. The results show an improvement in protection against corrosion phenomena compared to bare AISI 304L. Furthermore, the ability of the coating to release the Ag+ was evaluated in the simulated body fluid at 37 °C and it was found that the release mechanism switches from anomalous to diffusion controlled after 3 h.
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Li L, Liu T, Wang M, Ren Y, Jia N, Bu H, Xie G, Xu H, Wu Y, Ouyang X. Snowflake-like DNA crystals templated Cu clusters as a fluorescent turn-on probe for sensing actin. Anal Chim Acta 2021; 1173:338700. [PMID: 34172154 DOI: 10.1016/j.aca.2021.338700] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 05/08/2021] [Accepted: 05/24/2021] [Indexed: 12/01/2022]
Abstract
Herein, we synthesized snowflake-like DNA crystals (SDC) via hybridization chain reaction and used it for the first time in the synthesis of copper nanoclusters with enhanced fluorescence. Atomic force microscopy (AFM) and laser confocal microscopy characterization confirmed that SDC/CuNCs are self-assembled successfully on SDC. Aggregation induced emission allows SDC/CuNCs to exhibit better stability and stronger emission intensity. Thus, we developed the "turn-on" label-free fluorescence detection method of actin based on SDC/CuNCs which offer simplicity, low cost, good selectivity, and high sensitivity. The detection limit was determined to be 0.0124 μg mL-1, which was an order of magnitude lower than that of reported fluorescent methods (0.12 μg mL-1). Compared with previous method, the linear range is also much wider. We also performed standard recovery experiments in actual samples for evaluating the practicality of this strategy and proved that the capability of the proposed approach for the determination of actin is feasible and the interference from complex biological samples is negligible. These results indicate that SDC/CuNCs are expected to play a more important role in the field of biosensors.
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Affiliation(s)
- Le Li
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, Shaanxi, 710127, People's Republic of China
| | - Ting Liu
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, Shaanxi, 710127, People's Republic of China
| | - Meifang Wang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, Shaanxi, 710127, People's Republic of China
| | - Yong'an Ren
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, Shaanxi, 710127, People's Republic of China
| | - Nan Jia
- College of Life Sciences, Northwest University, Xi'an, Shaanxi, 710069, People's Republic of China
| | - Huaiyu Bu
- College of Life Sciences, Northwest University, Xi'an, Shaanxi, 710069, People's Republic of China
| | - Gang Xie
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, Shaanxi, 710127, People's Republic of China
| | - Hang Xu
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, Shaanxi, 710127, People's Republic of China
| | - Yongli Wu
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, Shaanxi, 710127, People's Republic of China
| | - Xiangyuan Ouyang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an, Shaanxi, 710127, People's Republic of China.
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Adsetts JR, Zhang R, Yang L, Chu K, Wong JM, Love DA, Ding Z. Efficient White Electrochemiluminescent Emission From Carbon Quantum Dot Films. Front Chem 2020; 8:580022. [PMID: 33134278 PMCID: PMC7552666 DOI: 10.3389/fchem.2020.580022] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Accepted: 08/18/2020] [Indexed: 12/27/2022] Open
Abstract
Carbon quantum dots (CQDs) were manufactured from citric acid and urea in a gram-scale synthesis with a controlled size range between 1. 5 and 23.8 nm. The size control was realized by varying volume of the precursor solution in a hydrothermal synthesis method. The prepared CQDs were investigated using electrochemiluminescence (ECL) spectroscopy at interfaces of their electrode films and electrolyte solution containing coreactants rather than conventional optoelectronic tests, providing an in-depth analysis of light-emission mechanisms of the so-called half-cells. ECL from the CQD films with TPrA and K2S2O8 as coreactants provided information on the stability of the CQD radicals in the films. It was discovered that CQD•- has a powerful electron donating nature to sulfate radical to generate ECL at a relative efficiency of 96% to the Ru(bpy)3Cl2/K2S2O8 coreactant system, indicating a strong performance in light emitting applications. The smaller the CQD particle sizes, the higher the ECL efficiency of the film interface, most likely due to the increased presence of surface states per mass of CQDs. Spooling ECL spectroscopy of the system revealed a potential-dependent light emission starting from a deep red color to blue-shifted intensity maximum, cool bright white emission with a correlated color temperature of 3,200 K. This color temperature is appropriate for most indoor lighting applications. The above ECL results provide information on the performance of CQD light emitters in films, permitting preliminary screening for light emitting candidates in optoelectronic applications. This screening has revealed CQD films as a powerful and cost-effective light emitting layer toward lighting devices for indoor applications.
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Affiliation(s)
| | - Ruizhong Zhang
- Department of Chemistry, The University of Western Ontario, London, ON, Canada
- Tianjin Key Laboratory of Molecular Photoelectronic Sciences, Department of Chemistry, Tianjin University, Tianjin, China
| | - Liuqing Yang
- Department of Chemistry, The University of Western Ontario, London, ON, Canada
| | - Kenneth Chu
- Department of Chemistry, The University of Western Ontario, London, ON, Canada
| | | | | | - Zhifeng Ding
- Department of Chemistry, The University of Western Ontario, London, ON, Canada
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Devi R, Gogoi S, Dutta HS, Bordoloi M, Sanghi SK, Khan R. Au/NiFe 2O 4 nanoparticle-decorated graphene oxide nanosheets for electrochemical immunosensing of amyloid beta peptide. NANOSCALE ADVANCES 2020; 2:239-248. [PMID: 36133989 PMCID: PMC9417307 DOI: 10.1039/c9na00578a] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 11/04/2019] [Indexed: 05/29/2023]
Abstract
In the present work, an electrochemical immunosensor has been fabricated for the detection of amyloid beta peptide (βA1--42) based on a gold nanoparticle/nickel ferrite decorated graphene oxide-chitosan nanocomposite (Au/NiFe2O4@GO-Ch) modified glassy carbon electrode (GCE) as an effective sensing platform. βA1-42 has been analyzed as a potential biomarker for its application in Alzheimer's disease monitoring. The combination of highly conducting Au and NiFe2O4 nanoparticles on two-dimensional GO nanosheets provides an excellent platform for sensitive and selective sensing applications. A miniaturized Au/NiFe2O4@GO-Ch/GCE immunosensor was prepared by immobilization of βA antibody onto Au//NiFe2O4@GO-Ch/GCE via carbodiimide coupling. Various characterization techniques were utilized in the study to estimate the morphological and electronic attributes of the components used to fabricate the immunosensor. Differential pulse voltammetry (DPV) was performed to study the amperometric response of the developed immunosensor as a function of βA1-42 concentration. The DPV results confirmed that the immunosensor detected βA1-42 selectively and demonstrated a wide linear range from 1 pg mL-1 to 1 ng mL-1 and a detection limit of 3.0 pg mL-1. Furthermore, the immunosensor also indicated its clinical viability by detecting βA1-42 in cerebrospinal fluid.
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Affiliation(s)
- Rashmita Devi
- Analytical Chemistry Group, Material Sciences and Technology Division, CSIR-North East Institute of Science & Technology (CSIR-NEIST) Jorhat-785006 India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-NEIST Campus Jorhat India
| | - Satyabrat Gogoi
- Analytical Chemistry Group, Material Sciences and Technology Division, CSIR-North East Institute of Science & Technology (CSIR-NEIST) Jorhat-785006 India
| | - Hemant Sankar Dutta
- Analytical Chemistry Group, Material Sciences and Technology Division, CSIR-North East Institute of Science & Technology (CSIR-NEIST) Jorhat-785006 India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-NEIST Campus Jorhat India
| | - Manobjyoti Bordoloi
- Academy of Scientific and Innovative Research (AcSIR), CSIR-NEIST Campus Jorhat India
- Natural Product Chemistry Group, Chemical Sciences and Technology Division, CSIR-NEIST Jorhat-785006 Assam India
| | - Sunil K Sanghi
- Microfluidics & MEMS Centre, CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI) Bhopal-462026 MP India
| | - Raju Khan
- Microfluidics & MEMS Centre, CSIR-Advanced Materials and Processes Research Institute (CSIR-AMPRI) Bhopal-462026 MP India
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