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Wei S, Ding B, Wang G, Luo S, Zhao H, Dan X. Population characteristics of pathogenic Escherichia coli in puerperal metritis of dairy cows in Ningxia region of China: a systemic taxa distribution of virulence factors and drug resistance genes. Front Microbiol 2024; 15:1364373. [PMID: 38694808 PMCID: PMC11061491 DOI: 10.3389/fmicb.2024.1364373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Accepted: 03/28/2024] [Indexed: 05/04/2024] Open
Abstract
Escherichia coli (E. coli) is closely associated with the occurrence of puerperal metritis in dairy cows. E. coli carries some the virulence and multi-drug resistant genes, which pose a serious threat to the health of postpartum cows. In this study, E. coli was isolated and identified from the uterine contents of postpartum cows with puerperal metritis in the Ningxia region of China, and its phylogenetic subgroups were determined. Meanwhile, virulence and drug resistance genes carried by E. coli and drug sensitivity were detected, and the characteristics of virulence and drug resistance genes distribution in E. coli phylogroups were further analyzed. The results showed that the isolation rate of E. coli in puerperal metritis samples was 95.2%. E. coli was mainly divided into phylogroups B2 and D, followed by groups A and B1, and was more connected to O157:H7, O169:H4, and ECC-1470 type strains. The virulence genes were mainly dominated by ompF (100%), traT (100%), fimH (97%), papC (96%), csgA (95%), Ang43 (93.9%), and ompC (93%), and the resistance genes were dominated by TEM (99%), tetA (71.7%), aac(3)II (66.7%), and cmlA (53.5%). Additionally, it was observed that the virulence and resistance gene phenotypes could be divided into two subgroups, with subgroup B2 and D having the highest distributions. Drug sensitivity tests also revealed that the E. coli was most sensitive to the fluoroquinolones enrofloxacin, followed by macrolides, aminoglycosides, tetracyclines, β-lactams, peptides and sulfonamides, and least sensitive to lincosamides. These results imply that pathogenic E. coli, which induces puerperal metritis of dairy cows in the Ningxia region of China, primarily belongs to the group B2 and D, contains multiple virulence and drug resistance genes, Moreover, E. coli has evolved resistance to several drugs including penicillin, lincomycin, cotrimoxazole, and streptomycin. It will offer specific guidelines reference for the prevention and treatment of puerperal metritis in dairy cows with E. coli infections in the Ningxia region of China.
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Affiliation(s)
| | | | | | | | - Hongxi Zhao
- College of Animal Science and Technology, Ningxia University, Yinchuan, China
| | - Xingang Dan
- College of Animal Science and Technology, Ningxia University, Yinchuan, China
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2
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Rasouli R, Villegas KM, Tabrizian M. Acoustofluidics - changing paradigm in tissue engineering, therapeutics development, and biosensing. LAB ON A CHIP 2023; 23:1300-1338. [PMID: 36806847 DOI: 10.1039/d2lc00439a] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
For more than 70 years, acoustic waves have been used to screen, diagnose, and treat patients in hundreds of medical devices. The biocompatible nature of acoustic waves, their non-invasive and contactless operation, and their compatibility with wide visualization techniques are just a few of the many features that lead to the clinical success of sound-powered devices. The development of microelectromechanical systems and fabrication technologies in the past two decades reignited the spark of acoustics in the discovery of unique microscale bio applications. Acoustofluidics, the combination of acoustic waves and fluid mechanics in the nano and micro-realm, allowed researchers to access high-resolution and controllable manipulation and sensing tools for particle separation, isolation and enrichment, patterning of cells and bioparticles, fluid handling, and point of care biosensing strategies. This versatility and attractiveness of acoustofluidics have led to the rapid expansion of platforms and methods, making it also challenging for users to select the best acoustic technology. Depending on the setup, acoustic devices can offer a diverse level of biocompatibility, throughput, versatility, and sensitivity, where each of these considerations can become the design priority based on the application. In this paper, we aim to overview the recent advancements of acoustofluidics in the multifaceted fields of regenerative medicine, therapeutic development, and diagnosis and provide researchers with the necessary information needed to choose the best-suited acoustic technology for their application. Moreover, the effect of acoustofluidic systems on phenotypic behavior of living organisms are investigated. The review starts with a brief explanation of acoustofluidic principles, the different working mechanisms, and the advantages or challenges of commonly used platforms based on the state-of-the-art design features of acoustofluidic technologies. Finally, we present an outlook of potential trends, the areas to be explored, and the challenges that need to be overcome in developing acoustofluidic platforms that can echo the clinical success of conventional ultrasound-based devices.
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Affiliation(s)
- Reza Rasouli
- Department of Biomedical Engineering, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada.
| | - Karina Martinez Villegas
- Department of Biomedical Engineering, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada.
| | - Maryam Tabrizian
- Department of Biomedical Engineering, Faculty of Medicine and Health Sciences, McGill University, Montreal, Quebec, Canada.
- Faculty of Dental Medicine and Oral Health Sciences, McGill University, Montreal, Quebec, Canada
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3
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Gueddida A, Zhang V, Carpentier L, Bonhomme J, Bonello B, Pennec Y, Djafari-Rouhani B. Phononic Crystal Made of Silicon Ridges on a Membrane for Liquid Sensing. SENSORS (BASEL, SWITZERLAND) 2023; 23:2080. [PMID: 36850678 PMCID: PMC9960324 DOI: 10.3390/s23042080] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/04/2023] [Accepted: 02/10/2023] [Indexed: 06/18/2023]
Abstract
We propose the design of a phononic crystal to sense the acoustic properties of a liquid that is constituted by an array of silicon ridges on a membrane. In contrast to other concepts, the ridges are immersed in the liquid. The introduction of a suitable cavity in the periodic array gives rise to a confined defect mode with high localization in the cavity region and strong solid-liquid interaction, which make it sensitive to the acoustic properties of the liquid. By using a finite element method simulation, we theoretically study the transmission and cavity excitation of an incident flexural wave of the membrane. The observation of the vibrations of this mode can be achieved either outside the area of the phononic crystal or just above the cavity. We discuss the existence of the resonant modes, as well as its quality factor and sensitivity to liquid properties as a function of the geometrical parameters. The performance of the proposed sensor has then been tested to detect the variation in NaI concentration in a NaI-water mixture.
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Affiliation(s)
- Abdellatif Gueddida
- Institut d’Electronique, Microélectronique et Nanotechnologie, UMR CNRS8520, Université de Lille, 59650 Villeneuve d’Ascq, France
| | - Victor Zhang
- Institut d’Electronique, Microélectronique et Nanotechnologie, UMR CNRS8520, Université de Lille, 59650 Villeneuve d’Ascq, France
| | - Laurent Carpentier
- Institut d’Electronique, Microélectronique et Nanotechnologie, UMR CNRS8520, Université de Lille, 59650 Villeneuve d’Ascq, France
| | - Jérémy Bonhomme
- Institut des Nanosciences de Paris, Sorbonne Université, UMR CNRS 7588, 75005 Paris, France
| | - Bernard Bonello
- Institut des Nanosciences de Paris, Sorbonne Université, UMR CNRS 7588, 75005 Paris, France
| | - Yan Pennec
- Institut d’Electronique, Microélectronique et Nanotechnologie, UMR CNRS8520, Université de Lille, 59650 Villeneuve d’Ascq, France
| | - Bahram Djafari-Rouhani
- Institut d’Electronique, Microélectronique et Nanotechnologie, UMR CNRS8520, Université de Lille, 59650 Villeneuve d’Ascq, France
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Han S, Zhang T, Lyu Y, Lai S, Dai P, Zheng J, Yang W, Zhou XH, Feng L. Influenza's Plummeting During the COVID-19 Pandemic: The Roles of Mask-Wearing, Mobility Change, and SARS-CoV-2 Interference. ENGINEERING (BEIJING, CHINA) 2023. [PMID: 35127196 DOI: 10.1016/j.eng.2022.05.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Seasonal influenza activity typically peaks in the winter months but plummeted globally during the current coronavirus disease 2019 (COVID-19) pandemic. Unraveling lessons from influenza's unprecedented low profile is critical in informing preparedness for incoming influenza seasons. Here, we explored a country-specific inference model to estimate the effects of mask-wearing, mobility changes (international and domestic), and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) interference in China, England, and the United States. We found that a one-week increase in mask-wearing intervention had a percent reduction of 11.3%-35.2% in influenza activity in these areas. The one-week mobility mitigation had smaller effects for the international (1.7%-6.5%) and the domestic community (1.6%-2.8%). In 2020-2021, the mask-wearing intervention alone could decline percent positivity by 13.3-19.8. The mobility change alone could reduce percent positivity by 5.2-14.0, of which 79.8%-98.2% were attributed to the deflected international travel. Only in 2019-2020, SARS-CoV-2 interference had statistically significant effects. There was a reduction in percent positivity of 7.6 (2.4-14.4) and 10.2 (7.2-13.6) in northern China and England, respectively. Our results have implications for understanding how influenza evolves under non-pharmaceutical interventions and other respiratory diseases and will inform health policy and the design of tailored public health measures.
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Affiliation(s)
- Shasha Han
- Beijing International Center for Mathematical Research, Peking University, Beijing 100871, China
- Harvard Medical School, Harvard University, Boston, MA 02115, USA
| | - Ting Zhang
- School of Population Medicine and Public Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Yan Lyu
- Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
| | - Shengjie Lai
- WorldPop, School of Geography and Environmental Science, University of Southampton, Southampton SO17 1BJ, UK
| | - Peixi Dai
- Division for Infectious Diseases, Chinese Center for Disease Control and Prevention, Beijing 102206, China
| | - Jiandong Zheng
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100871, China
| | - Weizhong Yang
- School of Population Medicine and Public Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
| | - Xiao-Hua Zhou
- Beijing International Center for Mathematical Research, Peking University, Beijing 100871, China
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100871, China
- National Engineering Laboratory of Big Data Analysis and Applied Technology, Peking University, Beijing 100871, China
| | - Luzhao Feng
- School of Population Medicine and Public Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China
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5
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Wu B, Luo CJ, Palaniappan A, Jiang X, Gultekinoglu M, Ulubayram K, Bayram C, Harker A, Shirahata N, Khan AH, Dalvi SV, Edirisinghe M. Generating Lifetime-Enhanced Microbubbles by Decorating Shells with Silicon Quantum Nano-Dots Using a 3-Series T-Junction Microfluidic Device. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:10917-10933. [PMID: 36018789 PMCID: PMC9476864 DOI: 10.1021/acs.langmuir.2c00126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 08/13/2022] [Indexed: 06/15/2023]
Abstract
Long-term stability of microbubbles is crucial to their effectiveness. Using a new microfluidic device connecting three T-junction channels of 100 μm in series, stable monodisperse SiQD-loaded bovine serum albumin (BSA) protein microbubbles down to 22.8 ± 1.4 μm in diameter were generated. Fluorescence microscopy confirmed the integration of SiQD on the microbubble surface, which retained the same morphology as those without SiQD. The microbubble diameter and stability in air were manipulated through appropriate selection of T-junction numbers, capillary diameter, liquid flow rate, and BSA and SiQD concentrations. A predictive computational model was developed from the experimental data, and the number of T-junctions was incorporated into this model as one of the variables. It was illustrated that the diameter of the monodisperse microbubbles generated can be tailored by combining up to three T-junctions in series, while the operating parameters were kept constant. Computational modeling of microbubble diameter and stability agreed with experimental data. The lifetime of microbubbles increased with increasing T-junction number and higher concentrations of BSA and SiQD. The present research sheds light on a potential new route employing SiQD and triple T-junctions to form stable, monodisperse, multi-layered, and well-characterized protein and quantum dot-loaded protein microbubbles with enhanced stability for the first time.
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Affiliation(s)
- Bingjie Wu
- Department
of Mechanical Engineering, University College
London (UCL), London WC1E 7JE, U.K.
| | - C. J. Luo
- Department
of Mechanical Engineering, University College
London (UCL), London WC1E 7JE, U.K.
| | - Ashwin Palaniappan
- Department
of Mechanical Engineering, University College
London (UCL), London WC1E 7JE, U.K.
| | - Xinyue Jiang
- Department
of Mechanical Engineering, University College
London (UCL), London WC1E 7JE, U.K.
| | - Merve Gultekinoglu
- Department
of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Hacettepe University, Ankara 06100, Turkey
| | - Kezban Ulubayram
- Department
of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Hacettepe University, Ankara 06100, Turkey
| | - Cem Bayram
- Nanotechnology
and Nanomedicine Division, Institute for Graduate Studies in Science
& Engineering, Hacettepe University, Ankara 06100, Turkey
| | - Anthony Harker
- Department
of Physics and Astronomy, University College
London (UCL), London WC1E 7JE, U.K.
| | - Naoto Shirahata
- WPI
International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Graduate
School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-0814, Japan
| | - Aaqib H. Khan
- Chemical
Engineering, Indian Institute of Technology
Gandhinagar, Palaj, Gandhinagar 382355, Gujarat, India
| | - Sameer V. Dalvi
- Chemical
Engineering, Indian Institute of Technology
Gandhinagar, Palaj, Gandhinagar 382355, Gujarat, India
| | - Mohan Edirisinghe
- Department
of Mechanical Engineering, University College
London (UCL), London WC1E 7JE, U.K.
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6
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Luo T, Liu W, Wen Z, Xie Y, Tong X, Cai Y, Liu Y, Sun C. A High-Sensitivity Gravimetric Biosensor Based on S 1 Mode Lamb Wave Resonator. SENSORS (BASEL, SWITZERLAND) 2022; 22:s22155912. [PMID: 35957469 PMCID: PMC9371384 DOI: 10.3390/s22155912] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 07/29/2022] [Accepted: 08/02/2022] [Indexed: 05/30/2023]
Abstract
The development of MEMS acoustic resonators meets the increasing demand for in situ detection with a higher performance and smaller size. In this paper, a lithium niobate film-based S1 mode Lamb wave resonator (HF-LWR) for high-sensitivity gravimetric biosensing is proposed. The fabricated resonators, based on a 400-nm X-cut lithium niobate film, showed a resonance frequency over 8 GHz. Moreover, a PMMA layer was used as the mass-sensing layer, to study the performance of the biosensors based on HF-LWRs. Through optimizing the thickness of the lithium niobate film and the electrode configuration, the mass sensitivity of the biosensor could reach up to 74,000 Hz/(ng/cm2), and the maximum value of figure of merit (FOM) was 5.52 × 107, which shows great potential for pushing the performance boundaries of gravimetric-sensitive acoustic biosensors.
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Affiliation(s)
- Tiancheng Luo
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
| | - Wenjuan Liu
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
- Hubei Yangtze Memory Laboratories, Wuhan 430205, China
| | - Zhiwei Wen
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
| | - Ying Xie
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
| | - Xin Tong
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
| | - Yao Cai
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
- Hubei Yangtze Memory Laboratories, Wuhan 430205, China
| | - Yan Liu
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
| | - Chengliang Sun
- The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
- Hubei Yangtze Memory Laboratories, Wuhan 430205, China
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7
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Ngashangva L, Hemdan BA, El-Liethy MA, Bachu V, Minteer SD, Goswami P. Emerging Bioanalytical Devices and Platforms for Rapid Detection of Pathogens in Environmental Samples. MICROMACHINES 2022; 13:mi13071083. [PMID: 35888900 PMCID: PMC9321031 DOI: 10.3390/mi13071083] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 07/04/2022] [Accepted: 07/05/2022] [Indexed: 02/05/2023]
Abstract
The development of robust bioanalytical devices and biosensors for infectious pathogens is progressing well with the advent of new materials, concepts, and technology. The progress is also stepping towards developing high throughput screening technologies that can quickly identify, differentiate, and determine the concentration of harmful pathogens, facilitating the decision-making process for their elimination and therapeutic interventions in large-scale operations. Recently, much effort has been focused on upgrading these analytical devices to an intelligent technological platform by integrating them with modern communication systems, such as the internet of things (IoT) and machine learning (ML), to expand their application horizon. This review outlines the recent development and applications of bioanalytical devices and biosensors to detect pathogenic microbes in environmental samples. First, the nature of the recent outbreaks of pathogenic microbes such as foodborne, waterborne, and airborne pathogens and microbial toxins are discussed to understand the severity of the problems. Next, the discussion focuses on the detection systems chronologically, starting with the conventional methods, advanced techniques, and emerging technologies, such as biosensors and other portable devices and detection platforms for pathogens. Finally, the progress on multiplex assays, wearable devices, and integration of smartphone technologies to facilitate pathogen detection systems for wider applications are highlighted.
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Affiliation(s)
- Lightson Ngashangva
- Transdisciplinary Biology, Rajiv Gandhi Centre for Biotechnology (RGCB), Thiruvanthapuram, Kerala 695014, India;
| | - Bahaa A. Hemdan
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India; (B.A.H.); (V.B.)
- Water Pollution Research Department, Environmental and Climate Change Research Institute, National Research Centre, 33 El Buhouth Street, Cairo P.O. Box 12622, Egypt;
| | - Mohamed Azab El-Liethy
- Water Pollution Research Department, Environmental and Climate Change Research Institute, National Research Centre, 33 El Buhouth Street, Cairo P.O. Box 12622, Egypt;
| | - Vinay Bachu
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India; (B.A.H.); (V.B.)
| | - Shelley D. Minteer
- Department of Chemistry, University of Utah, 315 South 1400 East, RM 2020, Salt Lake City, UT 84112, USA
- Correspondence: (S.D.M.); (P.G.)
| | - Pranab Goswami
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India; (B.A.H.); (V.B.)
- Correspondence: (S.D.M.); (P.G.)
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8
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Nair MP, Teo AJT, Li KHH. Acoustic Biosensors and Microfluidic Devices in the Decennium: Principles and Applications. MICROMACHINES 2021; 13:24. [PMID: 35056189 PMCID: PMC8779171 DOI: 10.3390/mi13010024] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 12/11/2021] [Accepted: 12/20/2021] [Indexed: 12/27/2022]
Abstract
Lab-on-a-chip (LOC) technology has gained primary attention in the past decade, where label-free biosensors and microfluidic actuation platforms are integrated to realize such LOC devices. Among the multitude of technologies that enables the successful integration of these two features, the piezoelectric acoustic wave method is best suited for handling biological samples due to biocompatibility, label-free and non-invasive properties. In this review paper, we present a study on the use of acoustic waves generated by piezoelectric materials in the area of label-free biosensors and microfluidic actuation towards the realization of LOC and POC devices. The categorization of acoustic wave technology into the bulk acoustic wave and surface acoustic wave has been considered with the inclusion of biological sample sensing and manipulation applications. This paper presents an approach with a comprehensive study on the fundamental operating principles of acoustic waves in biosensing and microfluidic actuation, acoustic wave modes suitable for sensing and actuation, piezoelectric materials used for acoustic wave generation, fabrication methods, and challenges in the use of acoustic wave modes in biosensing. Recent developments in the past decade, in various sensing potentialities of acoustic waves in a myriad of applications, including sensing of proteins, disease biomarkers, DNA, pathogenic microorganisms, acoustofluidic manipulation, and the sorting of biological samples such as cells, have been given primary focus. An insight into the future perspectives of real-time, label-free, and portable LOC devices utilizing acoustic waves is also presented. The developments in the field of thin-film piezoelectric materials, with the possibility of integrating sensing and actuation on a single platform utilizing the reversible property of smart piezoelectric materials, provide a step forward in the realization of monolithic integrated LOC and POC devices. Finally, the present paper highlights the key benefits and challenges in terms of commercialization, in the field of acoustic wave-based biosensors and actuation platforms.
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Affiliation(s)
| | | | - King Ho Holden Li
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore; (M.P.N.); (A.J.T.T.)
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9
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Yusoh SN, Yaacob KA. Study on the Physical Properties of a SiNW Biosensor to the Sensitivity of DNA Detection. MATERIALS 2021; 14:ma14195716. [PMID: 34640114 PMCID: PMC8510051 DOI: 10.3390/ma14195716] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 09/20/2021] [Accepted: 09/27/2021] [Indexed: 01/15/2023]
Abstract
SiNW (silicon nanowire) arrays consisting of 5- and 10-wires were fabricated by using an atomic force microscope—the local anodic oxidation (AFM-LAO) technique followed by wet chemical etching. Tetramethylammonium hydroxide (TMAH) and isopropyl alcohol (IPA) at various concentrations were used to etch SiNWs. The SiNWs produced were differed in dimension and surface roughness. The SiNWs were functionalized and used for the detection of deoxyribonucleic acid (DNA) dengue (DEN-1). SiNW-based biosensors show sensitive detection of dengue DNA due to certain factors. The physical properties of SiNWs, such as the number of wires, the dimensions of wires, and surface roughness, were found to influence the sensitivity of the biosensor device. The SiNW biosensor device with 10 wires, a larger surface-to-volume ratio, and a rough surface is the most sensitive device, with a 1.93 fM limit of detection (LOD).
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10
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Sensitivity Enhancement in Plasma Polymer Films for Surface Acoustic Wave Based Sensor Applications. COATINGS 2021. [DOI: 10.3390/coatings11101193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Plasma polymer films (PPF), widely used as sensing layers in surface acoustic wave (SAW) based gas and liquid phase sensors, have a major drawback: high concentrations of the sensed analytes easily drive these films into saturation, where accurate measurements are no longer possible. This work suggests a solution to this problem by modifying the PPF with the sensed chemical compound to improve the overall sorption properties and sensor dynamic range. Thin polymer films were synthesized from hexamethyldisiloxane (HMDSO) and triethylsilane (TES) monomers in a plasma-enhanced chemical vapor deposition (PECVD) process using a RF plasma reactor. We used these Si-containing compounds because they are known for their excellent sensing properties. In this work, the layers were deposited onto the active surface of high-Q 438 MHz Rayleigh SAW two-port resonators, used as mass sensitive sensor elements. We call these devices quartz surface microbalances (QSM). In a second step, ammonia plasma modification was applied to the HMDSO and TES films, in order to achieve a higher sensitivity to NH3. The sensors were probed at different NH3 gas concentrations in a computer controlled gas probing setup. A comparison with unmodified films revealed a 74% to 85% improvement in both the sensitivity and sorption ability of the HMDSO sensing layers, and of about 8% for the TES films.
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11
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Alexaki K, Giust D, Kyriazi ME, El-Sagheer AH, Brown T, Muskens OL, Kanaras AG. A DNA sensor based on upconversion nanoparticles and two-dimensional dichalcogenide materials. Front Chem Sci Eng 2021. [DOI: 10.1007/s11705-020-2023-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
AbstractWe demonstrate the fabrication of a new DNA sensor that is based on the optical interactions occurring between oligonucleotide-coated NaYF4:Yb3+;Er3+ upconversion nanoparticles and the two-dimensional dichalcogenide materials, MoS2 and WS2. Monodisperse upconversion nanoparticles were functionalized with single-stranded DNA endowing the nanoparticles with the ability to interact with the surface of the two-dimensional materials via van der Waals interactions leading to subsequent quenching of the upconversion fluorescence. By contrast, in the presence of a complementary oligonucleotide target and the formation of double-stranded DNA, the upconversion nanoparticles could not interact with MoS2 and WS2, thus retaining their inherent fluorescence properties. Utilizing this sensor we were able to detect target oligonucleotides with high sensitivity and specificity whilst reaching a concentration detection limit as low as 5 mol·L−1, within minutes.
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12
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Frequency Shift of a SH-SAW Biosensor with Glutaraldehyde and 3-Aminopropyltriethoxysilane Functionalized Films for Detection of Epidermal Growth Factor. BIOSENSORS-BASEL 2020; 10:bios10080092. [PMID: 32764513 PMCID: PMC7459952 DOI: 10.3390/bios10080092] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 07/30/2020] [Accepted: 07/31/2020] [Indexed: 01/29/2023]
Abstract
The frequency shift of a shear-horizontal surface-acoustic-wave (SH-SAW) biosensor in which the concentration of biomolecule is determined by the amount of its adsorption on the sensing film was studied. Simulation results were compared with experimental results to investigate its sensitivity and to develop a model to estimate the concentration of a cancer-related biomarker antigen epidermal growth factor (EGF) in the sample, with two types of sensing films, 3-aminopropyltriethoxysilane (APTES) and glutaraldehyde. With the concentration of the targeted biomarker varying from 0.2 to 5 ng/mL, a typical exponential relationship was found between the concentration and the frequency shift of the SH-SAW sensor. Measurement results showed a clear response of this immunosensor to the mass-loading effects of the antibody–antigen. The sensitivity of the glutaraldehyde film is greater than that of the APTES film owing to the chemisorption of the antibody. In the simulation, a shift of the SH-SAW resonant frequency due to added mass occurred on applying an incremental surface mass density on the sensing film, while in real applications, the concentration of the targeted biomarker to be absorbed in the sensing film is demanded. An empirical model was proposed to calculate the frequency shift in the simulation of the SH-SAW biosensor, corresponding to the concentration of specific biomolecules absorbed on a specific film. From the semi-empirical model, the sensitivity level is found to be 0.641 and 1.709 kHz/(ng/mL) for APTES and glutaraldehyde sensing films, respectively, at a biomarker concentration of less than 1 ng/mL. The developed method is useful for quickly estimating the frequency shift with respect to the concentration of the target molecules in the simulation for SH-SAW sensors.
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13
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Chen Z, Zhou J, Tang H, Liu Y, Shen Y, Yin X, Zheng J, Zhang H, Wu J, Shi X, Chen Y, Fu Y, Duan H. Ultrahigh-Frequency Surface Acoustic Wave Sensors with Giant Mass-Loading Effects on Electrodes. ACS Sens 2020; 5:1657-1664. [PMID: 32390428 DOI: 10.1021/acssensors.0c00259] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Surface acoustic wave (SAW) devices are widely used for physical, chemical, and biological sensing applications, and their sensing mechanisms are generally based on frequency changes due to mass-loading effects at the acoustic wave propagation area between two interdigitated transducers (IDTs). In this paper, a new sensing mechanism has been proposed based on a significantly enhanced mass-loading effect generated directly on Au IDT electrodes, which enables significantly enhanced sensitivity, compared with that of conventional SAW devices. The fabricated ultrahigh-frequency SAW devices show a significant mass-loading effect on the electrodes. When the Au-electrode thickness increased from 12 to 25 nm, the Rayleigh mode resonant frequency decreased from 7.77 to 5.93 GHz, while that of the higher longitudinal leaky SAW decreased from 11.87 to 9.83 GHz. The corresponding mass sensitivity of 7309 MHz·mm2·μg-1 (Rayleigh mode) is ∼8.9 × 1011 times larger than that of a conventional quartz crystal balance (with a frequency of 5 MHz) and ∼1000 times higher than that of conventional SAW devices (with a frequency of 978 MHz). Trinitrotoluene concentration as low as 4.4 × 10-9 M (mol·L-1) can be detected using the fabricated SAW sensor, proving its giant mass-loading effect and ultrahigh sensitivity.
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Affiliation(s)
- Zhe Chen
- State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, P.R. China
| | - Jian Zhou
- National Engineering Research Centre for High Efficiency Grinding, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, P.R. China
| | - Hao Tang
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P.R. China
| | - Yi Liu
- Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, P.R. China
| | - Yiping Shen
- Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, P.R. China
| | - Xiaobo Yin
- National Engineering Research Centre for High Efficiency Grinding, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, P.R. China
| | - Jiangpo Zheng
- State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, P.R. China
| | - Hongshuai Zhang
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P.R. China
| | - Jianhui Wu
- State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, P.R. China
| | - Xianglong Shi
- Beijing Aerospace Micro-electronics Technology Co., Beijing 100854, P.R. China
| | - Yiqin Chen
- State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, P.R. China
| | - Yongqing Fu
- Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, United Kingdom
| | - Huigao Duan
- National Engineering Research Centre for High Efficiency Grinding, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, P.R. China
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Derakhshan-Nejad A, Rangkooy HA, Cheraghi M, Yengejeh RJ. Removal of ethyl benzene vapor pollutant from the air using TiO 2 nanoparticles immobilized on the ZSM-5 zeolite under UVradiation in lab scale. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2020; 18:201-209. [PMID: 32399232 PMCID: PMC7203389 DOI: 10.1007/s40201-020-00453-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 01/29/2020] [Indexed: 05/24/2023]
Abstract
Ethyl benzene is a volatile organic compound that is used in the many industries, including Oil and Gas, Oil colored and Insecticides. Due to the toxic effects of this chemical substance control and elimination of this vapor is necessary. Photo catalytic degradation is a possible method to remove organic compounds from air. This study was performed to determine the efficiency of photo catalytic removal of ethyl benzene vapor using TiO2 nanoparticles immobilized on the ZSM-5 zeolite under UV radiation. This was an experimental study. The surface and volume of the pores of the bed were determined by the Bruner-Emmett-Teller (BET) method and Surface structure was determined by Scanning Electron Microscope (SEM), EDAX and X-Ray Diffraction (XRD). Dynamic air flow and different concentrations of ethyl benzene (25, 75 and 125 ppm) and flow rates (0.5, 0.7, and 1.0 L/min) were produced and the removal efficiency of ethyl benzene vapor were investigated using ZSM-5 and TiO2/ZSM-5/UV processes. The temperature and relative humidity were set at 25 ± 2°c and 35%. Evaluations for BET showed the specific surface areas decreased after loading TiO2 on ZSM-5. XRD and EDAX analysis and SEM images showed that zeolite structure was stabled and nanoparticles were successfully stabilized on Ze. The results showed that the highest removal efficiency (52%) by the process of TiO2/ZSM-5/UV (5 wt%) at concentration 25 ppm and flow rate 0.5 L/min respectively. The result of this study showed that the TiO2/ZSM-5catalyst may be a applicable and hopeful method to removal of ethyl benzene from air flow under UV irradiation.
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Affiliation(s)
- Azam Derakhshan-Nejad
- Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
| | - Hossein Ali Rangkooy
- Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Mahboobeh Cheraghi
- Department of Environmental Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
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15
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Razmi N, Hasanzadeh M, Willander M, Nur O. Recent Progress on the Electrochemical Biosensing of Escherichia coli O157:H7: Material and Methods Overview. BIOSENSORS 2020; 10:E54. [PMID: 32443629 PMCID: PMC7277213 DOI: 10.3390/bios10050054] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 05/11/2020] [Accepted: 05/13/2020] [Indexed: 01/21/2023]
Abstract
Escherichia coli O157:H7 (E. coli O157:H7) is a pathogenic strain of Escherichia coli which has issued as a public health threat because of fatal contamination of food and water. Therefore, accurate detection of pathogenic E. coli is important in environmental and food quality monitoring. In spite of their advantages and high acceptance, culture-based methods, enzyme-linked immunosorbent assays (ELISAs), polymerase chain reaction (PCR), flow cytometry, ATP bioluminescence, and solid-phase cytometry have various drawbacks, including being time-consuming, requiring trained technicians and/or specific equipment, and producing biological waste. Therefore, there is necessity for affordable, rapid, and simple approaches. Electrochemical biosensors have shown great promise for rapid food- and water-borne pathogen detection. Over the last decade, various attempts have been made to develop techniques for the rapid quantification of E. coli O157:H7. This review covers the importance of E. coli O157:H7 and recent progress (from 2015 to 2020) in the development of the sensitivity and selectivity of electrochemical sensors developed for E. coli O157:H7 using different nanomaterials, labels, and electrochemical transducers.
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Affiliation(s)
- Nasrin Razmi
- Physics and Electronics, Department of Sciences and Technology, Linköping University, SE-601 74 Norrköping, Sweden;
| | - Mohammad Hasanzadeh
- Pharmaceutical Analysis Research Center, Tabriz University of Medical Sciences, Tabriz 51664, Iran;
| | - Magnus Willander
- Physics and Electronics, Department of Sciences and Technology, Linköping University, SE-601 74 Norrköping, Sweden;
| | - Omer Nur
- Physics and Electronics, Department of Sciences and Technology, Linköping University, SE-601 74 Norrköping, Sweden;
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16
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Nadzirah S, Hashim U, Gopinath SCB, Parmin NA, Hamzah AA, Yu HW, Dee CF. Titanium dioxide-mediated resistive nanobiosensor for E. coli O157:H7. Mikrochim Acta 2020; 187:235. [PMID: 32185529 DOI: 10.1007/s00604-020-4214-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Accepted: 03/03/2020] [Indexed: 12/19/2022]
Abstract
A titanium dioxide nanoparticle (TiO2 NP)-mediated resistive biosensor is described for the determination of DNA fragments of Escherichia coli O157:H7 (E. coli O157:H7). The sol-gel method was used to synthesize the TiO2 NP, and microlithography was applied to fabricate the interdigitated sensor electrodes. Conventional E. coli DNA detections are facing difficulties in long-preparation-and-detection-time (more than 3 days). Hence, electronic biosensor was introduced by measuring the current-voltage (I-V) DNA probe without amplification of DNA fragments. The detection scheme is based on the interaction between the electron flow on the sensor and the introduction of negative charges from DNA probe and target DNA. The biosensor has a sensitivity of 1.67 × 1013 Ω/M and a wide analytical range. The limit detection is down to 1 × 10-11 M of DNA. The sensor possesses outstanding repeatability and reproducibility and is cabable to detect DNA within 15 min in a minute-volume sample (1 μL). Graphical abstract Fig. (a) Graphical illustration of electronic biosensor set up and (b) relationship between limit of detection (LOD) and the unaffected poultry samples on E. coli O157:H7.
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Affiliation(s)
- Sh Nadzirah
- Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia.
| | - U Hashim
- Institute of Nano Electronic Engineering, Universiti Malaysia Perlis, 01000, Kangar, Perlis, Malaysia
| | - Subash C B Gopinath
- Institute of Nano Electronic Engineering, Universiti Malaysia Perlis, 01000, Kangar, Perlis, Malaysia.,School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600, Arau, Perlis, Malaysia
| | - N A Parmin
- Institute of Nano Electronic Engineering, Universiti Malaysia Perlis, 01000, Kangar, Perlis, Malaysia.,School of Bioprocess Engineering, Universiti Malaysia Perlis, 02600, Arau, Perlis, Malaysia
| | - Azrul Azlan Hamzah
- Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia
| | - Hung Wei Yu
- Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, 30010, Taiwan
| | - Chang Fu Dee
- Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia.
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17
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Chen X, Wang M, Zhao G. Point-of-Care Assessment of Hemostasis with a Love-Mode Surface Acoustic Wave Sensor. ACS Sens 2020; 5:282-291. [PMID: 31903758 DOI: 10.1021/acssensors.9b02382] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Monitoring of the hemostasis status is essential for therapeutic anticoagulants, undergoing surgery, cardiovascular diseases, etc. Although the clinical values of conventional blood coagulation tests have been well demonstrated, these devices have limitations such as large and expensive equipment, excessive sample volumes, long turnaround times, and difficulty in miniaturization for point-of-care use. Here, we present a novel strategy to evaluate blood hemostasis using the single-port Love-mode surface acoustic wave (SLSAW) sensor. The SLSAW sensor was designed as a plug-and-play-type unit for disposable use and operated under the harmonic resonant mode to produce frequency response to the blood coagulation cascade. Compared with a quartz crystal microbalance, Lamb wave, and film bulk acoustic resonator, the frequency shift of SLSAW was significantly increased, ranging from approximately 8960 to 10 368 kHz, which indicated enhancement of the signal-to-noise ratio. To demonstrate the feasibility of the SLSAW, studies were carried out to examine the effects of temperature and clotting reagents on coagulation times and kinetics. Activated partial thromboplastin times of plasma were validated by comparing with SYSMEX CA-7000 with the correlation (R2) as 0.996. In terms of coagulation kinetics, reaction time, clot formation time, maximum frequency shift, and clot formation rate of whole blood correlated well with corresponding parameters of the standard thromboelastography (TEG) analyzer (R2 = 0.9942, 0.9868, 0.9712, and 0.9939, respectively). The SLSAW sensor, with the advantages of low cost, small size, little sample consumption (1 μL), disposable use, and simple operation, is a promising tool for point-of-care diagnosis of hemostasis.
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Affiliation(s)
- Xi Chen
- Department of Electronic Science and Technology, University of Science and Technology of China, Hefei 230027, Anhui, China
| | - Meng Wang
- Department of Electronic Science and Technology, University of Science and Technology of China, Hefei 230027, Anhui, China
| | - Gang Zhao
- Department of Electronic Science and Technology, University of Science and Technology of China, Hefei 230027, Anhui, China
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18
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Ji J, Pang Y, Li D, Huang Z, Zhang Z, Xue N, Xu Y, Mu X. An aptamer-based shear horizontal surface acoustic wave biosensor with a CVD-grown single-layered graphene film for high-sensitivity detection of a label-free endotoxin. MICROSYSTEMS & NANOENGINEERING 2020; 6:4. [PMID: 34567619 PMCID: PMC8433395 DOI: 10.1038/s41378-019-0118-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 09/10/2019] [Accepted: 10/11/2019] [Indexed: 05/22/2023]
Abstract
The thickness of the sensitive layer has an important influence on the sensitivity of a shear horizontal surface acoustic wave (SH-SAW) biosensor with a delay-line structure and lower layer numbers of graphene produce better sensitivity for biological detection. Therefore, a label-free and highly sensitive SH-SAW biosensor with chemical vapor deposition (CVD-)-grown single-layered graphene (SLG) for endotoxin detection was developed in this study. With this methodology, SH-SAW biosensors were fabricated on a 36° Y-90° X quartz substrate with a base frequency of 246.2 MHz, and an effective detection cell was fabricated using acrylic material. To increase the surface hydrophilicity, chitosan was applied to the surface of the SLG film. Additionally, the aptamer was immobilized on the surface of the SLG film by cross-linking with glutaraldehyde. Finally, the sensitivity was verified by endotoxin detection with a linear detection ranging from 0 to 100 ng/mL, and the detection limit (LOD) was as low as 3.53 ng/mL. In addition, the stability of this type of SH-SAW biosensor from the air phase to the liquid phase proved to be excellent and the specificity was tested and verified by detecting the endotoxin obtained from Escherichia coli (E. coli), the endotoxin obtained from Pseudomonas aeruginosa (P. aeruginosa), and aflatoxin. Therefore, this type of SH-SAW biosensor with a CVD-grown SLG film may offer a promising approach to endotoxin detection, and it may have great potential in clinical applications.
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Affiliation(s)
- Junwang Ji
- Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, International R & D Center of Micro-nano Systems and New Materials Technology, Chongqing University, 400044 Chongqing, China
| | - Yiquan Pang
- School of Chemistry and Chemical Engineering, Chongqing University, 400030 Chongqing, China
| | - Dongxiao Li
- Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, International R & D Center of Micro-nano Systems and New Materials Technology, Chongqing University, 400044 Chongqing, China
| | - Zheng Huang
- Department of Applied Physics, Chongqing University, 401331 Chongqing, China
| | - Zuwei Zhang
- Chongqing Acoustic-Optic-Electric Corporation, China Electronic Technology Group Corporation, 400060 Chongqing, China
| | - Ning Xue
- Institute of Electronics, Chinese Academy of Sciences, 100190 Beijing, China
| | - Yi Xu
- Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, International R & D Center of Micro-nano Systems and New Materials Technology, Chongqing University, 400044 Chongqing, China
| | - Xiaojing Mu
- Key Laboratory of Optoelectronic Technology & Systems, Ministry of Education, International R & D Center of Micro-nano Systems and New Materials Technology, Chongqing University, 400044 Chongqing, China
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19
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Kothandaraman A, Alfadhl Y, Qureshi M, Edirisinghe M, Ventikos Y. Effect of the Mixing Region Geometry and Collector Distance on Microbubble Formation in a Microfluidic Device Coupled with ac-dc Electric Fields. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:10052-10060. [PMID: 30995839 DOI: 10.1021/acs.langmuir.8b03677] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In this work, we report a significant advance in the preparation of monodisperse microbubbles using a combination of microfluidic and electric field technologies. Microbubbles have been employed in various fields such as biomedical engineering, water purification, and food engineering. Many techniques have been investigated for their preparation. Of these, the microfluidic T-junction has shown great potential because of the high degree of control it has over processing parameters and the ability to produce monodisperse microbubbles. Two main lines of investigation were conducted in this work-the effect of varying the mixing region distance (Mx) and the influence of altering the tip-to-collector distance (Dx) when an ac-dc field is applied. It was found that when Mx was decreased from 200 to 100 μm, the microbubble diameter also decreased from 128 ± 3 to 88 ± 5 μm due to an increase in shear stress as a result of a reduction in surface area. Similarly, decreasing the tip-to-collector distance results in an increase in the electric field strength experienced at the nozzle, facilitating further reduction of the bubble diameter from 111 ± 1 to 86 ± 1 μm at an ac voltage of 6 kV P-P and an applied dc voltage of 6 kV. Experiments conducted with the optimal parameters identified from these previous experiments enabled further reduction of the microbubble diameter to 18 ± 2 μm. These results suggest that a unique combination of parameters can be employed to achieve particular microbubble diameters to suit various applications.
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Affiliation(s)
- Anjana Kothandaraman
- Department of Mechanical Engineering , University College London , London WC1E 7JE , United Kingdom
| | - Yasir Alfadhl
- School of Electronic Engineering and Computer Science , Queen Mary University of London , London E1 4NS , United Kingdom
| | - Muhammad Qureshi
- School of Electronic Engineering and Computer Science , Queen Mary University of London , London E1 4NS , United Kingdom
| | - Mohan Edirisinghe
- Department of Mechanical Engineering , University College London , London WC1E 7JE , United Kingdom
| | - Yiannis Ventikos
- Department of Mechanical Engineering , University College London , London WC1E 7JE , United Kingdom
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20
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Lee S, Eom G, Yoon I, Park S, Kook G, Kim MK, Kim H, Seo JW, Lee HJ. Capacitive Micromachined Ultrasonic Transducer (CMUT)-based Biosensor for Detection of Low Concentration Neuropeptide. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2018; 2018:2897-2900. [PMID: 30441006 DOI: 10.1109/embc.2018.8512957] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Accurate detection of neuropeptides in cerebrospinal fluid (CSF) plays an important role in both indepth studies and early diagnosis of neurological diseases. Here, we report a biosensor based on Capacitive Micromachined Ultrasonic Transducer (CMUT) which is capable of detecting low concentrations (pg $\sim $ ng/ml) of a neuropeptide involved with the progression of Alzheimer's diseases, somatostatin (SST). A 10-MHz CMUT was fabricated and utilized as a physical resonant sensor which detects the change in the concentration of analyte through the mass-loading mechanism. The resonant plate was sequentially coated with protein G and antibodies to provide specificity to SST; Cysteine-tagged protein G layer enables controlled immobilization of antibodies in a welloriented manner. The change in the resonant frequency of the CMUT sensor was measured after incubating the sensor in various concentrations of SST. The significant shifts in the resonant frequency were observed for SST concentrations in the range of 10 pg/ml $\sim 1$ ng/ml. Compared to the previously reported biosensors developed for SST detection, our sensor shows discernable responses for SST that are $\sim 6$ orders of magnitude lower in concentration. Thus, this work demonstrates the potential of the CMUT resonant sensor as a promising biosensor platform for detection of neuropeptides involved with neurodegenerative diseases that often exist in low concentrations in CSF.
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21
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von Helden L, Schmidbauer M, Liang S, Hanke M, Wördenweber R, Schwarzkopf J. Ferroelectric monoclinic phases in strained K 0.70Na 0.30NbO 3 thin films promoting selective surface acoustic wave propagation. NANOTECHNOLOGY 2018; 29:415704. [PMID: 30024387 DOI: 10.1088/1361-6528/aad485] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We present a detailed analysis of the ferroelectric domain structure of K0.70Na0.30NbO3 thin films on (110) TbScO3 grown by metal-organic chemical vapor deposition. Upon piezoresponse force microscopy and nanofocus x-ray diffraction measurements we derive a domain model revealing monoclinic MC domains. The complex domain pattern is formed out of four co-existing in-plane orientations of the shearing direction of the monoclinic unit cell resulting in four types of superdomains each being composed of well-ordered stripe domains. Finally, we present surface acoustic wave (SAW) experiments that exhibit extraordinary signal intensities given the low thickness of the tested film. Moreover, the SAW propagation is found to occur selectively along the identified shearing directions.
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22
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Okuda S, Ono T, Kanai Y, Ikuta T, Shimatani M, Ogawa S, Maehashi K, Inoue K, Matsumoto K. Graphene Surface Acoustic Wave Sensor for Simultaneous Detection of Charge and Mass. ACS Sens 2018; 3:200-204. [PMID: 29283246 DOI: 10.1021/acssensors.7b00851] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have combined a graphene field-effect transistor (GFET) and a surface acoustic wave (SAW) sensor on a LiTaO3 substrate to create a graphene surface acoustic wave (GSAW) sensor. When a SAW propagates in graphene, an acoustoelectric current (IA) flows between two attached electrodes. This current has unique electrical characteristics, having both positive and negative peak values with respect to the electrolyte-gate voltage (VEg) in solution. We found that IA is controlled by VEg and the amplitude of the SAW. It was also confirmed that the GSAW sensor detects changes of electrical charge in solution like conventional GFET sensors. Furthermore, the detection of amino-group-modified microbeads was performed by employing a GSAW sensor in a phthalate buffer solution at pH 4.1. The hole current peak shifted to the lower left in the IA-VEg characteristics. The left shift was caused by charge detection by the GFET and can be explained by an increase of amino groups that have positive charges at pH 4.1. In contrast, the downward shift is thought to be due to a reduction in the amplitude of the propagating SAW because of an increase in the mass loading of microbeads. This mass loading was detected by the SAW sensor. Thus, we have demonstrated that the GSAW sensor is a transducer capable of the simultaneous detection of charge and mass, which indicates that it is an attractive platform for highly sensitive and multifunctional solution sensing.
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Affiliation(s)
- Satoshi Okuda
- The
Institute of Scientific and Industrial Research, Osaka University, 8-1
Mihogaoka, Ibaraki, Osaka 567-0047, Japan
- Advanced Technology R&D Center, Mitsubishi Electric Corporation, 8-1-1 Tsukaguchi-Honmachi, Amagasaki, Hyogo 661-8661, Japan
| | - Takao Ono
- The
Institute of Scientific and Industrial Research, Osaka University, 8-1
Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Yasushi Kanai
- The
Institute of Scientific and Industrial Research, Osaka University, 8-1
Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Takashi Ikuta
- The
Institute of Scientific and Industrial Research, Osaka University, 8-1
Mihogaoka, Ibaraki, Osaka 567-0047, Japan
- Institute
of Engineering, Tokyo University of Agriculture and Technology, 2-24-16
Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Masaaki Shimatani
- Advanced Technology R&D Center, Mitsubishi Electric Corporation, 8-1-1 Tsukaguchi-Honmachi, Amagasaki, Hyogo 661-8661, Japan
| | - Shinpei Ogawa
- Advanced Technology R&D Center, Mitsubishi Electric Corporation, 8-1-1 Tsukaguchi-Honmachi, Amagasaki, Hyogo 661-8661, Japan
| | - Kenzo Maehashi
- The
Institute of Scientific and Industrial Research, Osaka University, 8-1
Mihogaoka, Ibaraki, Osaka 567-0047, Japan
- Institute
of Engineering, Tokyo University of Agriculture and Technology, 2-24-16
Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Koichi Inoue
- The
Institute of Scientific and Industrial Research, Osaka University, 8-1
Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Kazuhiko Matsumoto
- The
Institute of Scientific and Industrial Research, Osaka University, 8-1
Mihogaoka, Ibaraki, Osaka 567-0047, Japan
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23
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Nguyen VH, Kaulen C, Simon U, Schnakenberg U. Single Interdigital Transducer Approach for Gravimetrical SAW Sensor Applications in Liquid Environments. SENSORS 2017; 17:s17122931. [PMID: 29258213 PMCID: PMC5751692 DOI: 10.3390/s17122931] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 12/09/2017] [Accepted: 12/12/2017] [Indexed: 12/05/2022]
Abstract
Surface acoustic wave (SAW) devices are well known for mass-sensitive sensor applications. In biosensing applications, chemical and biochemically evoked binding processes on surfaces are detected in liquid environments using delay line or resonator sensor configurations, preferably in combination with the appropriate microfluidic devices. All configurations share the common feature of analyzing the transmission characteristic of the propagating SAW. In this paper, a novel SAW-based impedance sensor type is introduced which uses only one interdigital transducer (IDT), simultaneously as the SAW generator and the sensor element. Here, the input port reflection coefficient S11 is measured at the IDT instead of the commonly used S21 transmission forward gain parameter. Thus, a sharp and distinct peak of the S11 spectrum is obtained, enabling a comfortable direct readout of the sensor signal. Proof of the concept was gained by analyzing the specific binding of the 4-mercaptophenylacetic acid gold nanoparticles (MPA–AuNP) directly to the IDT surface. The corresponding binding kinetic of the MPA–AuNP on the functionalized gold surface has been analyzed and a sensitivity of 7.4 mΩ nM−1 has been determined.
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Affiliation(s)
- Vu Hoa Nguyen
- Institute of Materials in Electrical Engineering 1, RWTH Aachen University, 52074 Aachen, Germany.
| | - Corinna Kaulen
- Institute of Inorganic Chemistry and JARA-Fundamentals of Future Information Technologies, RWTH Aachen University, 52074 Aachen, Germany.
| | - Ulrich Simon
- Institute of Inorganic Chemistry and JARA-Fundamentals of Future Information Technologies, RWTH Aachen University, 52074 Aachen, Germany.
| | - Uwe Schnakenberg
- Institute of Materials in Electrical Engineering 1, RWTH Aachen University, 52074 Aachen, Germany.
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Mujahid A, Dickert FL. Surface Acoustic Wave (SAW) for Chemical Sensing Applications of Recognition Layers. SENSORS 2017; 17:s17122716. [PMID: 29186771 PMCID: PMC5750728 DOI: 10.3390/s17122716] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 11/20/2017] [Indexed: 11/21/2022]
Abstract
Surface acoustic wave (SAW) resonators represent some of the most prominent acoustic devices for chemical sensing applications. As their frequency ranges from several hundred MHz to GHz, therefore they can record remarkably diminutive frequency shifts resulting from exceptionally small mass loadings. Their miniaturized design, high thermal stability and possibility of wireless integration make these devices highly competitive. Owing to these special characteristics, they are widely accepted as smart transducers that can be combined with a variety of recognition layers based on host-guest interactions, metal oxide coatings, carbon nanotubes, graphene sheets, functional polymers and biological receptors. As a result of this, there is a broad spectrum of SAW sensors, i.e., having sensing applications ranging from small gas molecules to large bio-analytes or even whole cell structures. This review shall cover from the fundamentals to modern design developments in SAW devices with respect to interfacial receptor coatings for exemplary sensor applications. The related problems and their possible solutions shall also be covered, with a focus on emerging trends and future opportunities for making SAW as established sensing technology.
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Affiliation(s)
- Adnan Mujahid
- Department of Analytical Chemistry, University of Vienna, Währinger Straße 38, A-1090 Vienna, Austria;
- Institute of Chemistry, University of the Punjab, Quaid-i-Azam Campus, Lahore 54590, Pakistan
| | - Franz L. Dickert
- Department of Analytical Chemistry, University of Vienna, Währinger Straße 38, A-1090 Vienna, Austria;
- Correspondence: ; Tel.: +43-1-4277-52301; Fax: +43-1-4277-9523
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Wang L, Huang F, Cai G, Yao L, Zhang H, Lin J. An Electrochemical Aptasensor Using Coaxial Capillary with Magnetic Nanoparticle, Urease Catalysis and PCB Electrode for Rapid and Sensitive Detection of Escherichia coli O157:H7. Nanotheranostics 2017; 1:403-414. [PMID: 29071202 PMCID: PMC5647763 DOI: 10.7150/ntno.22079] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Accepted: 08/30/2017] [Indexed: 01/08/2023] Open
Abstract
The continuous outbreaks of foodborne diseases have drawn public attentions to food safety. Early screening of foodborne pathogens is crucial to prevent and control of foodborne diseases. In this study, a novel electrochemical aptasensor was developed for rapid and sensitive detection of E. coli O157:H7 using the coaxial capillary with immune magnetic nanoparticles (MNPs) for specific separation of the target bacteria, the urease with urea for amplification of the impedance signals, and the PCB gold electrode for measurement of the impedance change. The streptavidin modified MNPs were conjugated with the biotinylated polyclonal antibodies (PAbs) to form the immune MNPs, and captured in the coaxial capillary with the line-up high gradient magnetic fields to separate the bacteria from the large volume of sample. Then, the gold nanoparticles (GNPs) were modified with the aptamers against E. coli and the urease, and injected into the capillary to react with the bacteria and form the MNP-PAb-bacteria-aptamer-GNP-urease complexes. Finally, the urease on the complexes was used to catalyze the hydrolysis of urea into ammonium ions and carbonate ions in the capillary, leading to the decrease in the impedance of the catalysate, which was measured by the gold plating PCB electrode. The impedance change of the catalysate and the concentration of the bacteria had a good linear relationship. This aptasensor was able to detect E. coli as low as 101 CFU/mL in 3 h, and the mean recovery of E. coli in the spiked pasteurized milk was ~99%. This proposed aptasensor has the potential for practical applications of foodborne pathogen detection due to its short detection time, high sensitivity and low cost.
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Affiliation(s)
- Lei Wang
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, China Agricultural University, 17 East Qinghua Road, Beijing, 100083 China
| | - Fengchun Huang
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, China Agricultural University, 17 East Qinghua Road, Beijing, 100083 China
| | - Gaozhe Cai
- Key Laboratory on Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, 17 East Qinghua Road, Beijing, 100083 China
| | - Lan Yao
- Key Laboratory on Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, 17 East Qinghua Road, Beijing, 100083 China
| | - Huilin Zhang
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, China Agricultural University, 17 East Qinghua Road, Beijing, 100083 China
| | - Jianhan Lin
- Key Laboratory on Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, 17 East Qinghua Road, Beijing, 100083 China
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