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Le Y, Zhou F, Yang L, Zhu Y, Yang D. Enhanced Antimicrobial Activity of AgCu Nanoparticles: The Role of Particle Size and Alloy Composition. Molecules 2024; 29:3027. [PMID: 38998976 PMCID: PMC11242933 DOI: 10.3390/molecules29133027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2024] [Revised: 06/20/2024] [Accepted: 06/22/2024] [Indexed: 07/14/2024] Open
Abstract
AgCu bimetallic· nanoparticles (NPs) represent a novel class of inorganic, broad-spectrum antimicrobial agents that offer enhanced antimicrobial effectiveness and reduced cytotoxicity compared to conventional Ag NP antibacterial materials. This study examines the antimicrobial performance and structural characteristics of AgCu nanoparticles (NPs) synthesized via two distinct chemical reduction processes using PVP-PVA as stabilizers. Despite identical chemical elements and sphere-like shapes in both synthesis methods, the resulting AgCu nanoparticles exhibited significant differences in size and antimicrobial properties. Notably, AgCu NPs with smaller average particle sizes demonstrated weaker antimicrobial activity, as assessed by the minimum inhibitory concentration (MIC) measurement, contrary to conventional expectations. However, larger average particle-sized AgCu NPs showed superior antimicrobial effectiveness. High-resolution transmission electron microscopy analysis revealed that nearly all larger particle-sized nanoparticles were AgCu nanoalloys. In contrast, the smaller particle-sized samples consisted of both AgCu alloys and monometallic Ag and Cu NPs. The fraction of Ag ions (relative to the total silver amount) in the larger AgCu NPs was found to be around 9%, compared to only 5% in that of the smaller AgCu NPs. This indicates that the AgCu alloy content significantly contributes to enhanced antibacterial efficacy, as a higher AgCu content results in the increased release of Ag ions. These findings suggest that the enhanced antimicrobial efficacy of AgCu NPs is primarily attributed to their chemical composition and phase structures, rather than the size of the nanoparticles.
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Affiliation(s)
- Yuping Le
- Shanghai Technical Institute of Electronics & Information, 3098 Wahong Road, Shanghai 201411, China
| | - Fang Zhou
- NanoTeX Lab, Solmont Technology Wuxi Co., Ltd., 228 Linghu Blvd, Tian’an Tech Park, A1-602, Wuxi 214135, China
| | - Longlai Yang
- NanoTeX Lab, Solmont Technology Wuxi Co., Ltd., 228 Linghu Blvd, Tian’an Tech Park, A1-602, Wuxi 214135, China
| | - Yan Zhu
- Shanghai Technical Institute of Electronics & Information, 3098 Wahong Road, Shanghai 201411, China
- NanoTeX Lab, Solmont Technology Wuxi Co., Ltd., 228 Linghu Blvd, Tian’an Tech Park, A1-602, Wuxi 214135, China
| | - Dequan Yang
- NanoTeX Lab, Solmont Technology Wuxi Co., Ltd., 228 Linghu Blvd, Tian’an Tech Park, A1-602, Wuxi 214135, China
- Solmont Technology Inc., 1305 Blvd Lebanc, Laval, QC H7E 4N5, Canada
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Hao Z, Wang M, Cheng L, Si M, Feng Z, Feng Z. Synergistic antibacterial mechanism of silver-copper bimetallic nanoparticles. Front Bioeng Biotechnol 2024; 11:1337543. [PMID: 38260749 PMCID: PMC10800703 DOI: 10.3389/fbioe.2023.1337543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 12/20/2023] [Indexed: 01/24/2024] Open
Abstract
The excessive use of antibiotics in clinical settings has resulted in the rapid expansion, evolution, and development of bacterial and microorganism resistance. It causes a significant challenge to the medical community. Therefore, it is important to develop new antibacterial materials that could replace traditional antibiotics. With the advancements in nanotechnology, it has become evident that metallic and metal oxide nanoparticles (MeO NPs) exhibit stronger antibacterial properties than their bulk and micron-sized counterparts. The antibacterial properties of silver nanoparticles (Ag NPs) and copper nanoparticles (Cu NPs) have been extensively studied, including the release of metal ions, oxidative stress responses, damages to cell integrity, and immunostimulatory effects. However, it is crucial to consider the potential cytotoxicity and genotoxicity of Ag NPs and Cu NPs. Numerous experimental studies have demonstrated that bimetallic nanoparticles (BNPs) composed of Ag NPs and Cu NPs exhibit strong antibacterial effects while maintaining low cytotoxicity. Bimetallic nanoparticles offer an effective means to mitigate the genotoxicity associated with individual nanoparticles while considerably enhancing their antibacterial efficacy. In this paper, we presented on various synthesis methods for Ag-Cu NPs, emphasizing their synergistic effects, processes of reactive oxygen species (ROS) generation, photocatalytic properties, antibacterial mechanisms, and the factors influencing their performance. These materials have the potential to enhance efficacy, reduce toxicity, and find broader applications in combating antibiotic resistance while promoting public health.
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Affiliation(s)
- Zhaonan Hao
- School and Hospital of Stomatology, Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Shanxi Medical University, Taiyuan, China
| | - Mingbo Wang
- Guangdong Engineering Technology Research Center of Implantable Medical Polymer, Shenzhen Lando Biomaterials Co, Ltd., Shenzhen, China
| | - Lin Cheng
- Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Tongji Shanxi Hospital, Third Hospital of Shanxi Medical University, Taiyuan, China
| | - Minmin Si
- School and Hospital of Stomatology, Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Shanxi Medical University, Taiyuan, China
| | - Zezhou Feng
- School and Hospital of Stomatology, Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Shanxi Medical University, Taiyuan, China
| | - Zhiyuan Feng
- Shanxi Academy of Advanced Research and Innovation (SAARI), Taiyuan, China
- Department of Orthodontics, Shanxi Provincial People’s Hospital, The Fifth Clinical Medical College of Shanxi Medical University, Taiyuan, China
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Zhou F, Peng J, Tao Y, Yang L, Yang D, Sacher E. The Enhanced Durability of AgCu Nanoparticle Coatings for Antibacterial Nonwoven Air Conditioner Filters. Molecules 2023; 28:5446. [PMID: 37513318 PMCID: PMC10384833 DOI: 10.3390/molecules28145446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 07/07/2023] [Accepted: 07/14/2023] [Indexed: 07/30/2023] Open
Abstract
Antibacterial nonwoven fabrics, incorporated with Ag, have been applied as masks and air conditioner filters to prevent the spread of disease from airborne respiratory pathogens. In this work, we present a comparison study of Ag ions: Ag and AgCu nanoparticles (NPs) coated onto nonwoven fabrics intended for use as air conditioner antibacterial filters. We illustrate their color changes and durability running in air conditioners using antibacterial activity testing and X-ray Photoelectron Spectroscopic (XPS) analysis. We found that AgCu NPs showed the best antibacterial efficacy and durability. XPS analysis indicated that the Ag concentration, on both the AgCu and Ag- NP-coated fibers, changed little. On the contrary, the Ag concentration on Ag ion-coated fibers decreased by ~30%, and the coated NPs aggregated over time. The color change in AgCu NP-coated fabric, from yellow to white, is caused by oxide shell formation over the NPs, with nearly 46% oxidized silver. Our results, both from antibacterial evaluation and wind blowing tests, indicate that AgCu NP-coated fibers have higher durability, while Ag ion-coated fibers have little durability in such applications. The enhanced durability of the AgCu NP-coated antibacterial fabrics can be attributed to stronger NP-fiber interactions and greater ion release.
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Affiliation(s)
- Fang Zhou
- NanoTeX Lab, Solmont Technology Wuxi Co., Ltd., 228 Linghu Blvd., Tian'an Tech Park, A1-602, Xinwu District, Wuxi 214135, China
| | - Jiabing Peng
- NanoTeX Lab, Solmont Technology Wuxi Co., Ltd., 228 Linghu Blvd., Tian'an Tech Park, A1-602, Xinwu District, Wuxi 214135, China
| | - Yujie Tao
- NanoTeX Lab, Solmont Technology Wuxi Co., Ltd., 228 Linghu Blvd., Tian'an Tech Park, A1-602, Xinwu District, Wuxi 214135, China
| | - Longlai Yang
- NanoTeX Lab, Solmont Technology Wuxi Co., Ltd., 228 Linghu Blvd., Tian'an Tech Park, A1-602, Xinwu District, Wuxi 214135, China
| | - Dequan Yang
- NanoTeX Lab, Solmont Technology Wuxi Co., Ltd., 228 Linghu Blvd., Tian'an Tech Park, A1-602, Xinwu District, Wuxi 214135, China
- Engineering School, Dali University, 2 Hongsheng Rd., Dali 671003, China
| | - Edward Sacher
- Regroupement Québécois de Matériaux de Pointe, Département de Génie Physique, Polytechnique Montréal, Case Postale 6079, Succursale Centre-Ville, Montréal, QC H3C 3A7, Canada
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Cytotoxicity and Antibacterial Efficacy of AgCu and AgFe NanoAlloys: A Comparative Study. Antibiotics (Basel) 2022; 11:antibiotics11121737. [PMID: 36551394 PMCID: PMC9774506 DOI: 10.3390/antibiotics11121737] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 11/25/2022] [Accepted: 11/28/2022] [Indexed: 12/04/2022] Open
Abstract
Although Ag nanoparticles (NPs) have been widely applied in daily life and in biomedical and industrial fields, there is a demand for Ag-based bimetallic nanoalloys (NAs), such as AgCu and AgFe, due to their enhanced antibacterial efficacy and reduced Ag consumption. In this work, we present a comparison study on the antibacterial efficacy and cytotoxicity rates of Ag NPs and AgCu and AgFe NAs to L929 mouse fibroblast cells using the CCK-8 technique based on the relative cell viability. The concept of the minimum death concentration (MDC) is introduced to estimate the cytotoxicity to the cells. It is found that the minimum inhibitory concentrations (MICs) of the NPs against E. coli and S. aureus decrease with the addition of both Cu and Fe. There is a strong correlation between the MDC and MIC, implying that the mechanisms of both antibacterial efficacy and cytotoxicity are similar. The enhanced antibacterial efficacy to bacteria and cytotoxicity toward the cell are attributed to Ag+ release. The following order is found for both the MIC and MDC: AgFe < AgCu < Ag NPs. However, there is no cytotoxicity to the L929 cells for AgFe and AgCu NAs at their MIC Ag concentrations against S. aureus.
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Tao Y, Zhou F, Wang K, Yang D, Sacher E. AgCu NP Formation by the Ag NP Catalysis of Cu Ions at Room Temperature and Their Antibacterial Efficacy: A Kinetic Study. Molecules 2022; 27:6951. [PMID: 36296543 PMCID: PMC9607368 DOI: 10.3390/molecules27206951] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 10/11/2022] [Accepted: 10/13/2022] [Indexed: 07/30/2023] Open
Abstract
Although a facile route to prepare AgCu nanoalloys (NAs) with enhanced antibacterial efficacy using Ag NP catalysis of Cu ions at elevated temperatures was previously developed, its detailed reaction process is still unclear due to the fast reaction process at higher temperatures. This work found that AgCu NAs can also be synthesized by the same process but at room temperature. AgCu NAs formation kinetics have been studied using UV-Visible spectra and Transmission Electron Microscopy (TEM), where formation includes Cu2+ deposition onto the Ag NP surface and Ag+ release, reduction, and agglomeration to form new Ag NPs; this is followed by a redistribution of the NA components and coalescence to form larger AgCu NPs. It is found that SPR absorption is linear with time early in the reaction, as expected for both pseudo-first-order (PFO) and pseudo-second-order (PSO) kinetics; neither model is followed subsequently due to contributions from newly formed Ag NPs and AgCu NAs. The antibacterial efficacy of the AgCu NAs thus formed was estimated, with a continuous increase over the whole alloying process, demonstrating the correlation of antibacterial efficacy with the extent of AgCu NA formation and Ag+ release.
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Affiliation(s)
- Yujie Tao
- Solmont Technology Wuxi Co., Ltd., 228 Linghu Blvd, Tian’an Tech Park, A1-602, Xinwu District, Wuxi 214135, China
- Division of Natural and Applied Sciences, Duke Kunshan University, Kunshan 215316, China
| | - Fang Zhou
- Solmont Technology Wuxi Co., Ltd., 228 Linghu Blvd, Tian’an Tech Park, A1-602, Xinwu District, Wuxi 214135, China
| | - Kaixin Wang
- Hefei Zhonghang Nanotechnology Development Co., Ltd., Gangji Town Industrial Park, Changfeng County, Hefei 231100, China
| | - Dequan Yang
- Solmont Technology Wuxi Co., Ltd., 228 Linghu Blvd, Tian’an Tech Park, A1-602, Xinwu District, Wuxi 214135, China
| | - Edward Sacher
- Regroupement Québécois de Matériaux de Pointe, Département de Génie Physique, Polytechnique Montréal, Case Postale 6079, Succursale Centre-Ville, Montréal, QC H3C 3A7, Canada
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Cheng J, Tu W, Ang EH, Aizudin M, Yang F, Zhou X, Yu D, Li F, Guo Z, Song Y. Achieving reinforced broad-spectrum and sustained antimicrobial efficacy by nickel-doping AlOOH nanoflower accommodated with uniform silver nanospecies. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128488] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Zhou F, Zhu Y, Yang L, Yang DQ, Sacher E. Ag NP catalysis of Cu ions in the preparation of AgCu NPs and the mechanism of their enhanced antibacterial efficacy. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.127831] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Bello-Lopez JM, Silva-Bermudez P, Prado G, Martínez A, Ibáñez-Cervantes G, Cureño-Díaz MA, Rocha-Zavaleta L, Manzo-Merino J, Almaguer-Flores A, Ramos-Vilchis C, Rodil SE. Biocide effect against SARS-CoV-2 and ESKAPE pathogens of a noncytotoxic silver-copper nanofilm. Biomed Mater 2021; 17. [PMID: 34673548 DOI: 10.1088/1748-605x/ac3208] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 10/21/2021] [Indexed: 02/07/2023]
Abstract
Nanometric materials with biocidal properties effective against severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) and pathogenic bacteria could be used to modify surfaces, reducing the risk of touching transmission. In this work, we showed that a nanometric layer of bimetallic AgCu can be effectively deposited on polypropylene (PP) fibers. The virucidal properties of the AgCu nanofilm were evaluated by comparing the viral loads remaining on uncoated and coated PP after contact times between 2 and 24 h. Quantification of virion numbers for different initial concentrations indicated a reduction of more than 95% after 2 h of contact. The bactericidal action of the AgCu nanofilm was also confirmed by inoculating uncoated and coated PP with a pool of pathogenic bacteria associated with pneumonia (ESKAPE). Meanwhile, no cytotoxicity was observed for human fibroblasts and keratinocyte cells, indicating that the nanofilm could be in contact with human skin without threat. The deposition of the AgCu nanofilm on the nonwoven component of reusable cloth masks might help to prevent virus and bacterial infection while reducing the pollution burden related to the disposable masks. The possible mechanism of biocide contact action was studied by quantum chemistry calculations that show that the addition of Ag and/or Cu makes the polymeric fiber a better electron acceptor. This can promote the oxidation of the phospholipids present at both the virus and bacterial membranes. The rupture at the membrane exposes and damages the genetic material of the virus. More studies are needed to determine the mechanism of action, but the results reported here indicate that Cu and Ag ions are good allies, which can help protect us from the virus that has caused this disturbing pandemic.
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Affiliation(s)
- J M Bello-Lopez
- Dirección de Investigación. Hospital Juárez de México, Av. Instituto Politécnico Nacional 5160, Magdalena de las Salinas, Delegación Gustavo A. Madero, 07760 CDMX, México
| | - P Silva-Bermudez
- Unidad de ingeniería de Téjidos, Terapia Celular y Medicina Regenerativa; Instituto Nacional de Rehabilitación Luis Guillermo Ibarra-Ibarra, Av. México-Xochimilco No. 289 Col. Arenal de Guadalupe, C.P. 14389 CDMX, México
| | - G Prado
- Laboratorio de Biotecnología; Instituto Nacional de Rehabilitación Luis Guillermo Ibarra-Ibarra, Av. México-Xochimilco No. 289 Col. Arenal de Guadalupe, C.P. 14389 CDMX, México
| | - A Martínez
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México. Circuito Exterior sn, Ciudad Universitaria, 04510 CDMX, México
| | - Gabriela Ibáñez-Cervantes
- Dirección de Investigación. Hospital Juárez de México, Av. Instituto Politécnico Nacional 5160, Magdalena de las Salinas, Delegación Gustavo A. Madero, 07760 CDMX, México
| | - Mónica Alethia Cureño-Díaz
- Dirección de Investigación. Hospital Juárez de México, Av. Instituto Politécnico Nacional 5160, Magdalena de las Salinas, Delegación Gustavo A. Madero, 07760 CDMX, México
| | - L Rocha-Zavaleta
- Departamento de Biología Molecular y Biotecnología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Circuito Escolar sn, Ciudad Universitaria, 04510 CDMX, México
| | - J Manzo-Merino
- Cátedras CONACyT-Instituto Nacional de Cancerología, CDMX, México
| | - A Almaguer-Flores
- Laboratorio de Biointerfases, Facultad de Odontología, División de Estudios de Posgrado e Investigación, Universidad Nacional Autónoma de México, 04510 CDMX, México
| | - C Ramos-Vilchis
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México. Circuito Exterior sn, Ciudad Universitaria, 04510 CDMX, México
| | - S E Rodil
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México. Circuito Exterior sn, Ciudad Universitaria, 04510 CDMX, México
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