1
|
Mittal D, Kaur G, Singh P, Yadav K, Ali SA. Nanoparticle-Based Sustainable Agriculture and Food Science: Recent Advances and Future Outlook. FRONTIERS IN NANOTECHNOLOGY 2020. [DOI: 10.3389/fnano.2020.579954] [Citation(s) in RCA: 103] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
In the current scenario, it is an urgent requirement to satisfy the nutritional demands of the rapidly growing global population. Using conventional farming, nearly one third of crops get damaged, mainly due to pest infestation, microbial attacks, natural disasters, poor soil quality, and lesser nutrient availability. More innovative technologies are immediately required to overcome these issues. In this regard, nanotechnology has contributed to the agrotechnological revolution that has imminent potential to reform the resilient agricultural system while promising food security. Therefore, nanoparticles are becoming a new-age material to transform modern agricultural practices. The variety of nanoparticle-based formulations, including nano-sized pesticides, herbicides, fungicides, fertilizers, and sensors, have been widely investigated for plant health management and soil improvement. In-depth understanding of plant and nanomaterial interactions opens new avenues toward improving crop practices through increased properties such as disease resistance, crop yield, and nutrient utilization. In this review, we highlight the critical points to address current nanotechnology-based agricultural research that could benefit productivity and food security in future.
Collapse
|
2
|
Mesoporous Pd@Pt nanoparticle-linked immunosorbent assay for detection of atrazine. Anal Chim Acta 2020; 1116:36-44. [DOI: 10.1016/j.aca.2020.03.045] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 03/16/2020] [Accepted: 03/22/2020] [Indexed: 11/19/2022]
|
3
|
Stavra E, Petrou PS, Koukouvinos G, Kiritsis C, Pirmettis I, Papadopoulos M, Goustouridis D, Economou A, Misiakos K, Raptis I, Kakabakos SE. Simultaneous determination of paraquat and atrazine in water samples with a white light reflectance spectroscopy biosensor. JOURNAL OF HAZARDOUS MATERIALS 2018; 359:67-75. [PMID: 30014916 DOI: 10.1016/j.jhazmat.2018.07.029] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 07/04/2018] [Accepted: 07/06/2018] [Indexed: 05/27/2023]
Abstract
An optical immunosensor based on White Light Reflectance Spectroscopy for the simultaneous determination of the herbicides atrazine and paraquat in drinking water samples is demonstrated. The biosensor allows for the label-free real-time monitoring of biomolecular interactions taking place onto a SiO2/Si chip by transforming the shift in the reflected interference spectrum due to reaction to effective biomolecular layer thickness. Dual-analyte determination is accomplished by functionalizing spatially distinct areas of the chip with protein conjugates of the two herbicides and scanning the surface with an optical reflection probe. A competitive immunoassay format was adopted, followed by reaction with secondary antibodies for signal enhancement. The sensor was highly sensitive with detection limits of 40 and 50 pg/mL for paraquat and atrazine, respectively, and the assay duration was 12 min. Recovery values ranging from 90.0 to 110% were determined for the two pesticides in spiked bottled and tap water samples, demonstrating the sensor accuracy. In addition, the sensor could be regenerated and re-used at least 20 times without significant effect on the assay characteristics. Its excellent analytical performance and short analysis time combined with the small sensor size should be helpful for fast on-site determinations of these analytes.
Collapse
Affiliation(s)
- Eleftheria Stavra
- Immunoassays-Immunosensors Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece; Analytical Chemistry Lab, Department of Chemistry, University of Athens, Panepistimiopolis, 15771 Zografou, Greece
| | - Panagiota S Petrou
- Immunoassays-Immunosensors Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece.
| | - Georgios Koukouvinos
- Immunoassays-Immunosensors Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece
| | - Christos Kiritsis
- Radiopharmaceuticals Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece
| | - Ioannis Pirmettis
- Radiopharmaceuticals Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece
| | - Minas Papadopoulos
- Radiopharmaceuticals Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece
| | - Dimitrios Goustouridis
- ThetaMetrisis S.A., Polydefkous 14, 12243 Egaleo, Greece; Electronics Department, TEI of Piraeus, 12244 Egaleo, Greece
| | - Anastasios Economou
- Analytical Chemistry Lab, Department of Chemistry, University of Athens, Panepistimiopolis, 15771 Zografou, Greece
| | - Konstantinos Misiakos
- Institute of Nanoscience & Nanotechnology, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece
| | - Ioannis Raptis
- ThetaMetrisis S.A., Polydefkous 14, 12243 Egaleo, Greece
| | - Sotirios E Kakabakos
- Immunoassays-Immunosensors Lab, INRASTES, NCSR "Demokritos", 15341 Aghia Paraskevi, Greece.
| |
Collapse
|
4
|
Vikrant K, Tsang DCW, Raza N, Giri BS, Kukkar D, Kim KH. Potential Utility of Metal-Organic Framework-Based Platform for Sensing Pesticides. ACS APPLIED MATERIALS & INTERFACES 2018; 10:8797-8817. [PMID: 29465977 DOI: 10.1021/acsami.8b00664] [Citation(s) in RCA: 110] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The progress in modern agricultural practices could not have been realized without the large-scale contribution of assorted pesticides (e.g., organophosphates and nonorganophosphates). Precise tracking of these chemicals has become very important for safeguarding the environment and food resources owing to their very high toxicity. Hence, the development of sensitive and convenient sensors for the on-site detection of pesticides is imperative to overcome practical limitations encountered in conventional methodologies, which require skilled manpower at the expense of high cost and low portability. In this regard, the role of novel, advanced functional materials such as metal-organic frameworks (MOFs) has drawn great interest as an alternative for conventional sensory systems because of their numerous advantages over other nanomaterials. This review was organized to address the recent advances in applications of MOFs for sensing various pesticides because of their tailorable optical and electrical characteristics. It also provides in-depth comparison of the performance of MOFs with other nanomaterial sensing platforms. Further, we discuss the present challenges (e.g., potential bias due to instability under certain conditions, variations in the diffusion rate of the pesticide, chemical interferences, and the precise measurement of luminesce quenching) in developing robust and sensitive sensors by using tailored porosity, functionalities, and better framework stability.
Collapse
Affiliation(s)
- Kumar Vikrant
- Department of Chemical Engineering and Technology, Centre of Advanced Study, Indian Institute of Technology , Banaras Hindu University , Varanasi 221005 , India
| | - Daniel C W Tsang
- Department of Civil and Environmental Engineering , The Hong Kong Polytechnic University , Hung Hom, Kowloon , Hong Kong , China
| | - Nadeem Raza
- Government Emerson College Affiliated with Bahauddin Zakariya University , Multan 60800 , Pakistan
- Department of Materials Science and Metallurgy , University of Cambridge , Cambridge CB3 0FS , U.K
| | - Balendu Shekher Giri
- Department of Chemical Engineering and Technology, Centre of Advanced Study, Indian Institute of Technology , Banaras Hindu University , Varanasi 221005 , India
| | - Deepak Kukkar
- Department of Nanotechnology , Sri Guru Granth Sahib World University , Fatehgarh Sahib 140406 , Punjab , India
- Department of Civil and Environmental Engineering , Hanyang University , 222 Wangsimni-Ro , Seoul 04763 , Republic of Korea
| | - Ki-Hyun Kim
- Department of Civil and Environmental Engineering , Hanyang University , 222 Wangsimni-Ro , Seoul 04763 , Republic of Korea
| |
Collapse
|
5
|
A double-label time-resolved fluorescent strip for rapidly quantitative detection of carbofuran residues in agro-products. Food Chem 2017; 231:295-300. [DOI: 10.1016/j.foodchem.2017.02.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 12/04/2016] [Accepted: 02/05/2017] [Indexed: 11/22/2022]
|
6
|
Taha M, Khan I, Coutinho JA. Complexation and molecular modeling studies of europium(III)–gallic acid–amino acid complexes. J Inorg Biochem 2016; 157:25-33. [DOI: 10.1016/j.jinorgbio.2016.01.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 01/06/2016] [Accepted: 01/18/2016] [Indexed: 01/06/2023]
|
7
|
Azevedo CB, Batista T, de Faria EH, Rocha LA, Ciuffi KJ, Nassar EJ. Nanospherical Silica as Luminescent Markers Obtained by Sol–Gel. J Fluoresc 2015; 25:433-40. [DOI: 10.1007/s10895-015-1530-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Accepted: 01/02/2015] [Indexed: 12/27/2022]
|
8
|
Self-assemblies of luminescent rare earth compounds in capsules and multilayers. Adv Colloid Interface Sci 2014; 207:361-75. [PMID: 24444756 DOI: 10.1016/j.cis.2013.12.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 11/30/2013] [Accepted: 12/27/2013] [Indexed: 11/22/2022]
Abstract
This review addresses luminescent rare earth compounds assembled in microcapsules as well as in planar films fabricated by the layer-by-layer (LbL) technique, the Langmuir-Blodgett (LB) method and in self-assembled monolayers. Chemical precipitation, electrostatic, van der Waals interactions and covalent bonds are involved in the assembly of these compounds. Self-organized ring patterns of rare earth complexes in Langmuir monolayers and on planar surfaces with stripe patterns, as well as fluorescence enhancement due to donor-acceptor pairs, microcavities, enrichment of rare earth compounds, and shell protection against water are described. Recent information on the tuning of luminescence intensity and multicolors by the excitation wavelength and the ratio of rare earth ions, respectively, are also reviewed. Potential applications of luminescent rare earth complex assemblies serving as biological probes, temperature and gas sensors are pointed out.
Collapse
|
9
|
Zhou N, Chen H, Li J, Chen L. Highly sensitive and selective voltammetric detection of mercury(II) using an ITO electrode modified with 5-methyl-2-thiouracil, graphene oxide and gold nanoparticles. Mikrochim Acta 2013. [DOI: 10.1007/s00604-013-0956-0] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
10
|
Linares EM, Pannuti CS, Kubota LT, Thalhammer S. Immunospot assay based on fluorescent nanoparticles for Dengue fever detection. Biosens Bioelectron 2012; 41:180-5. [PMID: 22981010 DOI: 10.1016/j.bios.2012.08.005] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Revised: 07/25/2012] [Accepted: 08/03/2012] [Indexed: 11/25/2022]
Abstract
Dengue fever is one of the most neglected tropical diseases and of highest international public health importance, with 50 million cases worldwide every year. Early detection can decrease mortality rates from more than 20% to less than 1% and the relevant early diagnosis analyte is the viral non-structural glycoprotein, NS1. Currently, enzyme linked immunosorbent assay (ELISA) is the method of choice to detect NS1. However, this is a time consuming method, requiring 3-5h, and it is the bottleneck for routine of clinical analysis laboratory in epidemic periods, when hundreds of samples should be tested. Here we describe an easy method combining principles of fluorophore linked immunosorbent assay (FLISA) and enzyme linked immunospotting (ELISPOT). For detection, we used mouse anti-NS1 IgG labeled with fluorescent nanoparticles. The presented procedure needs only 4 μL of serum samples and requires 45-60 min. The detection limit, 5.2 ng/mL, is comparable to ELISA tests. The comparison of 83 samples with a commercial ELISA revealed a sensitivity of 81% and specificity of 88%. The use of fluorescent nanoparticles provides a higher sensitivity than an assay using usual fluorescent dye molecules, besides avoiding bleaching effects. Based on the results, the proposed method provides fast, specific and sensitive results, and proves to be a suitable method for Dengue NS1 detection in impoverished regions or epidemic areas.
Collapse
Affiliation(s)
- Elisângela M Linares
- Helmholtz Zentrum München, German Research Center for Environmental Health, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany.
| | | | | | | |
Collapse
|
11
|
Aragay G, Pino F, Merkoçi A. Nanomaterials for Sensing and Destroying Pesticides. Chem Rev 2012; 112:5317-38. [DOI: 10.1021/cr300020c] [Citation(s) in RCA: 394] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Gemma Aragay
- Nanobioelectronics
and Biosensors
Group, Catalan Institute of Nanotechnology, UAB Campus, 08193 Bellaterra,
Barcelona, Spain
| | - Flavio Pino
- Nanobioelectronics
and Biosensors
Group, Catalan Institute of Nanotechnology, UAB Campus, 08193 Bellaterra,
Barcelona, Spain
| | - Arben Merkoçi
- Nanobioelectronics
and Biosensors
Group, Catalan Institute of Nanotechnology, UAB Campus, 08193 Bellaterra,
Barcelona, Spain
- ICREA,
Barcelona, Spain
| |
Collapse
|
12
|
Na Y, Sheng W, Yuan M, Li L, Liu B, Zhang Y, Wang S. Enzyme-linked immunosorbent assay and immunochromatographic strip for rapid detection of atrazine in water samples. Mikrochim Acta 2012. [DOI: 10.1007/s00604-012-0772-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
13
|
Cháfer-Pericás C, Maquieira A, Puchades R. Functionalized inorganic nanoparticles used as labels in solid-phase immunoassays. Trends Analyt Chem 2012. [DOI: 10.1016/j.trac.2011.07.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
|
14
|
Ghafari H, Parambath M, Hanley QS. Macromolecular binding and kinetic analysis with optically sectioned planar format assays. Analyst 2012; 137:4809-14. [DOI: 10.1039/c2an35134j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
15
|
Lin CY, Teng NC, Hsieh SC, Lin YS, Chang WJ, Hsiao SY, Huang HS, Huang HM. Real-time detection of β1 integrin expression on MG-63 cells using electrochemical impedance spectroscopy. Biosens Bioelectron 2011; 28:221-6. [PMID: 21816605 DOI: 10.1016/j.bios.2011.07.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 07/11/2011] [Accepted: 07/11/2011] [Indexed: 12/01/2022]
Abstract
Beta 1 integrin is a membrane protein responsible for attachment and migration of osteosarcoma cells. In this study, expression of β1 integrin on MG-63 cells, a human osteogenic sarcoma cell line, was monitored using electrochemical impedance spectroscopy (EIS). ITO-based biochips were developed using a semiconductor technique. Differences in electric resistance (ΔR) were measured continuously when cells binding with anti-β1 integrin antibody coagulated with nano-scale gold particles. The results of the EIS system were compared with traditional immunofluorescence staining. We found that sample chambers with higher cell densities had larger ΔR values. When the cell densities increased from 5 × 10(4) cells/ml to 5 × 10(5) cells/ml, the ΔR value dose-dependently increased from 14 Ω to 37 Ω. In addition, a highly linear relationship (correlation coefficient, 0.921) was found between the ΔR values and the corresponding fluorescence intensities (p<0.05). These results suggest that electrochemical impedance spectroscopy can be a useful tool for evaluating β1 integrin expression on cell membranes.
Collapse
Affiliation(s)
- Chun-Yen Lin
- School of Dentistry, College of Oral Medicine, Taipei Medical University, 250, Wu-Hsing Street, Taipei, Taiwan
| | | | | | | | | | | | | | | |
Collapse
|
16
|
Combined effect of co-existing heavy metals and organophosphate pesticide on adsorption of atrazine to river sediments. KOREAN J CHEM ENG 2011. [DOI: 10.1007/s11814-010-0504-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
17
|
Kutsenko OK, Trusova VM, Gorbenko GP, Deligeorgiev T, Vasilev A, Kaloianova S, Lesev N. Fluorescence Study of Lipid Bilayer Interactions of Eu(III) Coordination Complexes. J Fluoresc 2011; 21:1689-95. [DOI: 10.1007/s10895-011-0861-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2010] [Accepted: 02/13/2011] [Indexed: 11/24/2022]
|
18
|
|
19
|
Borisov SM, Mayr T, Mistlberger G, Klimant I. Dye-Doped Polymeric Particles for Sensing and Imaging. ADVANCED FLUORESCENCE REPORTERS IN CHEMISTRY AND BIOLOGY II 2010. [DOI: 10.1007/978-3-642-04701-5_6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|
20
|
Soukka T, Härmä H. Lanthanide Nanoparticules as Photoluminescent Reporters. LANTHANIDE LUMINESCENCE 2010. [DOI: 10.1007/4243_2010_11] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
21
|
Chen W, Fukuzumi S. Ligand-Dependent Ultrasonic-Assistant Self-Assemblies and Photophysical Properties of Lanthanide Nicotinic/Isonicotinic Complexes. Inorg Chem 2009; 48:3800-7. [DOI: 10.1021/ic9000279] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wentong Chen
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, SORST, Japan Science Technology Agency, Osaka 565-0871, Japan, and School of Chemistry and Chemical Engineering, Jinggangshan University, Ji’an, Jiangxi 343009, China
| | - Shunichi Fukuzumi
- Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, SORST, Japan Science Technology Agency, Osaka 565-0871, Japan, and School of Chemistry and Chemical Engineering, Jinggangshan University, Ji’an, Jiangxi 343009, China
| |
Collapse
|
22
|
Andreescu S, Njagi J, Ispas C, Ravalli MT. JEM Spotlight: Applications of advanced nanomaterials for environmental monitoring. ACTA ACUST UNITED AC 2009; 11:27-40. [DOI: 10.1039/b811063h] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
23
|
Sensitive and rapid immunoassay for parathyroid hormone using magnetic particle labels and magnetic actuation. J Immunol Methods 2008; 338:40-6. [DOI: 10.1016/j.jim.2008.07.001] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2008] [Revised: 05/23/2008] [Accepted: 07/01/2008] [Indexed: 11/19/2022]
|
24
|
Jiang X, Li D, Xu X, Ying Y, Li Y, Ye Z, Wang J. Immunosensors for detection of pesticide residues. Biosens Bioelectron 2008; 23:1577-87. [DOI: 10.1016/j.bios.2008.01.035] [Citation(s) in RCA: 132] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2007] [Revised: 01/15/2008] [Accepted: 01/29/2008] [Indexed: 10/22/2022]
|
25
|
Yudintsev A, Trusova V, Gorbenko G, Deligeorgiev T, Vasilev A, Gadjev N. Lipid bilayer interactions of Eu(III) tris-β-diketonato coordination complex. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.04.058] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
26
|
|
27
|
Farré M, Kantiani L, Barceló D. Advances in immunochemical technologies for analysis of organic pollutants in the environment. Trends Analyt Chem 2007. [DOI: 10.1016/j.trac.2007.10.004] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
28
|
Salmain M, Fischer-Durand N, Pradier CM. Infrared optical immunosensor: application to the measurement of the herbicide atrazine. Anal Biochem 2007; 373:61-70. [PMID: 18022375 DOI: 10.1016/j.ab.2007.10.031] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2007] [Revised: 10/22/2007] [Accepted: 10/24/2007] [Indexed: 11/26/2022]
Abstract
A new approach to optically transduce antigen-antibody association, needing no label, is described herein, taking advantage of the ability of reflection-absorption infrared (IR) spectroscopy to analyze organic thin films at the surface of reflective materials with high sensitivity. As a proof-of-principle, this new technique was applied to the immunodetection of the herbicide atrazine. Gold-coated chips were covered with a capture layer consisting of a protein derivative of the herbicide atrazine covalently bound to a self-assembled monolayer containing a carboxy-terminated thiolate. Successive binding of anti-atrazine antibody and secondary anti-rabbit immunoglobulin G antibody resulted in a change of the IR absorption properties of the organic film at the sensor surface. The two prominent amide I and II bands observed on the surface IR spectra were taken for semiquantitative analysis of the adsorbed protein amount. The presence of increasing amounts of atrazine resulted in the progressive inhibition of antibodies binding to the sensors, yielding a relative lower increase of the IR signals. The deduced standard curves displayed a sigmoidal shape typical of competitive inhibition assays. The test midpoint (IC(50)) and the limit of detection (IC(80)) were found to be in the nanomolar range and very close to those measured by an in-house enzyme-linked immunosorbent assay using the same antibody and the same antigen competitor.
Collapse
Affiliation(s)
- Michèle Salmain
- Ecole Nationale Supérieure de Chimie de Paris, Laboratoire de chimie et biochimie des complexes moléculaires (UMR CNRS 7576), 75231 Paris cedex 05, France.
| | | | | |
Collapse
|
29
|
Petty HR. Fluorescence microscopy: established and emerging methods, experimental strategies, and applications in immunology. Microsc Res Tech 2007; 70:687-709. [PMID: 17393476 DOI: 10.1002/jemt.20455] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Cutting-edge biophysical technologies including total internal reflection fluorescence microscopy, single molecule fluorescence, single channel opening events, fluorescence resonance energy transfer, high-speed exposures, two-photon imaging, fluorescence lifetime imaging, and other tools are becoming increasingly important in immunology as they link molecular events to cellular physiology, a key goal of modern immunology. The primary concern in all forms of microscopy is the generation of contrast; for fluorescence microscopy contrast can be thought of as the difference in intensity between the cell and background, the signal-to-noise ratio. High information-content images can be formed by enhancing the signal, suppressing the noise, or both. As improved tools, such as ICCD and EMCCD cameras, become available for fluorescence imaging in molecular and cellular immunology, it is important to optimize other aspects of the imaging system. Numerous practical strategies to enhance fluorescence microscopy experiments are reviewed. The use of instrumentation such as light traps, cameras, objectives, improved fluorescent labels, and image filtration routines applicable to low light level experiments are discussed. New methodologies providing resolution well beyond that given by the Rayleigh criterion are outlined. Ongoing and future developments in fluorescence microscopy instrumentation and technique are reviewed. This review is intended to address situations where the signal is weak, which is important for emerging techniques stressing super-resolution or live cell dynamics, but is less important for conventional applications such as indirect immunofluorescence. This review provides a broad integrative discussion of fluorescence microscopy with selected applications in immunology.
Collapse
Affiliation(s)
- Howard R Petty
- Department of Ophthalmology and Visual Sciences, University of Michigan Medical School, Ann Arbor, Michigan 48105, USA.
| |
Collapse
|
30
|
Bagal DS, Vijayan A, Aiyer RC, Karekar RN, Karve MS. Fabrication of sucrose biosensor based on single mode planar optical waveguide using co-immobilized plant invertase and GOD. Biosens Bioelectron 2007; 22:3072-9. [PMID: 17314040 DOI: 10.1016/j.bios.2007.01.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2006] [Revised: 12/22/2006] [Accepted: 01/10/2007] [Indexed: 11/28/2022]
Abstract
In present studies, the new optical sensing platform based on optical planar waveguide (OPWG) for sucrose estimation was reported. An evanescent-wave biosensor was designed by using novel agarose-guar gum (AG) biopolymer composite sol-gel with entrapped enzymes (acid invertase (INV) and glucose oxidase (GOD)). Partially purified watermelon invertase isolated from Citrullus vulgaris fruit (specific activity 832 units mg(-1)) in combination with GOD was physically entrapped in AG sol-gel and cladded on the surface of optical planar waveguide. Na(+)-K(+) ion-exchanged glass optical waveguides were prepared and employed for the fabrication of sucrose biosensor. By addressing the enzyme modified waveguide structure with, the optogeometric properties of adsorbed enzyme layer (12 microm) at the sensor solid-liquid interface were studied. The OPWG sensor with short response time (110 s) was characterized using the 0.2M acetate buffer, pH 5.5. The fabricated sucrose sensor showed concentration dependent linear response in the range 1 x 10(-10) to 1 x 10(-6)M of sucrose. Lower limit of detection of this novel AG-INV-GOD cladded OPWG sensor was found to be 2.5 x 10(-11)M sucrose, which indicates that the developed biosensor has higher sensitivity towards sucrose as compared to earlier reported sensors using various transducer systems. Biochips when stored at room temperature, showed high stability for 81 days with 80% retention of original sensitivity. These sucrose sensing biochips showed good operational efficiency for 10 cycles. The proper confinement of acid invertase and glucose oxidase in hydrogel composite was confirmed by scanning electron microscopy (SEM) images. The constructed OPWG sensor is versatile, easy to fabricate and can be used for sucrose measurements with very high sensitivity.
Collapse
Affiliation(s)
- Dipali S Bagal
- Biochemistry Division, Department of Chemistry, University of Pune, Pune, Maharashtra, India
| | | | | | | | | |
Collapse
|
31
|
González-Martínez MA, Puchades R, Maquieira A. Optical immunosensors for environmental monitoring: How far have we come? Anal Bioanal Chem 2006; 387:205-18. [PMID: 17072601 DOI: 10.1007/s00216-006-0849-8] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2006] [Revised: 09/06/2006] [Accepted: 09/08/2006] [Indexed: 12/21/2022]
Abstract
Immunosensing has proved to be a very interesting research area. This review discusses what has actually been achieved in the field of optical immunosensing for environmental screening, and what still needs to be done. The review is presented from a practical point of view. In terms of the basic design of the immunosensor, there is a trend towards decreasing assay time; indeed, this has been reduced from 15-20 minutes to less than 5 minutes. Another goal is to simplify the manifold, and label-free approaches combining indirect assay formats and the detection of antibody binding are popular. Rapid displacement assays have also been investigated thoroughly. In terms of some important features of immunosensing devices, the reusability of the sensing element has been studied in great depth, and working lifetimes of more than five hundred assays can now be found for all assay formats. Multianalyte assays are now being investigated, and current systems are able to monitor 2-3 target compounds, although this number is set to increase greatly (to >30) in the near future. In this sense, an increasing number of publications can be found on microarrays intended for multianalyte determinations. The application of immunosensing to real situations is the main challenge. Immunosensors are barely commercialized and are yet to be established as research or routine tools, due to a lack of validated protocols for a wide range of sample matrices. Regarding compounds considered as analytes, some significant pollutants such as dioxins or pharmaceuticals are rarely chosen as targets, although the current tendency is towards a broader spectrum of analytes. New immunoreagents should be raised for these compounds, for use in immunosensors that can be used as screening tools.
Collapse
Affiliation(s)
- M A González-Martínez
- Departemento de Química, Universidad Politécnica de Valencia, 46022, Valencia, Spain
| | | | | |
Collapse
|