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Zhang J, Tan M, Chen Q, Zhang K, Zhou Q, Lai W, Tang D. Split-type photoelectrochemical immunoassay for sensitive quantification of carcinoembryonic antigen based on target-induced in situ formation of Z-type heterojunction. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:1901-1907. [PMID: 38488115 DOI: 10.1039/d4ay00248b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/02/2024]
Abstract
Carcinoembryonic antigen (CEA), a vital biomarker, plays a significant role in the early diagnosis and prognostic estimation of malignant tumors. In this study, a split-type photoelectrochemical immunoassay for the sensitive quantification of CEA has been successfully developed based on the target-induced in situ formation of a Z-type heterojunction. First, gold nanoparticle-decorated ZnIn2S4 (AuNPs/ZnIn2S4) composites were synthesized and used for the fabrication of photoelectrodes. Then, the detection antibody labeled with Ag nanoparticles was formed and applied for the biorecognition of CEA and subsequent liberation of Ag+ ions to induce the in situ formation of Ag2S/AuNPs/ZnIn2S4, a Z-type heterojunction, on the photoelectrode. The Z-type Ag2S/AuNPs/ZnIn2S4 heterojunction with effectively promoted separation of photogenerated charge carriers could lead to a markedly enhanced photocurrent response and highly sensitive quantification of CEA. Moreover, the three-dimensional spatial structure of ZnIn2S4 provides abundant active sites for the reaction and exhibits non-enzymatic properties, which are conducive to the further improvement of the analytical performance of CEA. The developed split-type photoelectrochemical immunoassay with good sensitivity, satisfactory selectivity, reliable stability, wide dynamic linear range (0.01-20 ng mL-1), and low detection limit (7.3 pg mL-1) offers valuable insights into the development of novel PEC biosensing models for the detection of tumor biomarkers and holds potential application value in the field of disease diagnosis.
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Affiliation(s)
- Jianhui Zhang
- School of Advanced Manufacturing, Fuzhou University, Jinjiang 362200, People's Republic of China.
| | - Meirong Tan
- School of Advanced Manufacturing, Fuzhou University, Jinjiang 362200, People's Republic of China.
| | - Qian Chen
- School of Advanced Manufacturing, Fuzhou University, Jinjiang 362200, People's Republic of China.
| | - Kangyao Zhang
- School of Advanced Manufacturing, Fuzhou University, Jinjiang 362200, People's Republic of China.
| | - Qian Zhou
- Henan International Joint Laboratory of Medicinal Plants Utilization, College of Chemistry and Molecular Sciences, Henan University, Kaifeng 475000, People's Republic of China.
| | - Wenqiang Lai
- Key Laboratory of Modern Analytical Science and Separation Technology of Fujian Province, Key Laboratory of Pollution Monitoring and Control of Fujian Province, College of Chemistry, Chemical Engineering and Environment, Minnan Normal University, Zhangzhou 363000, People's Republic of China
| | - Dianping Tang
- Key Laboratory of Analysis and Detection for Food Safety (Ministry of Education & Fujian Province), Institute of Nanomedicine and Nanobiosensing, Department of Chemistry, Fuzhou University, Fuzhou 350108, People's Republic of China
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2
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Torregrosa D, Jauset-Rubio M, Serrano R, Svobodová M, Grindlay G, O'Sullivan CK, Mora J. Ultrasensitive determination of β-conglutin food allergen by means an aptamer assay based on inductively coupled plasma mass spectrometry detection. Anal Chim Acta 2023; 1252:341042. [PMID: 36935136 DOI: 10.1016/j.aca.2023.341042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 03/01/2023] [Accepted: 03/02/2023] [Indexed: 03/06/2023]
Abstract
The overall objective of this work is the evaluation of different competitive aptamer assays based on inductively coupled plasma mass spectrometry (ICP-MS) detection for the determination of β-conglutin (food protein allergen from lupin) in flour samples. To this end, two competitive aptamer assay schemes were developed using either thiolated aptamers chemisorbed onto gold nanoparticles (AuNPs) or biotinylated aptamers linked to streptavidin-AuNPs. The influence of ICP-MS detection mode (i.e., conventional vs single particle) on assay performance was explored. In the case of the thiolated aptamer, the limit of detection (LoD) obtained using the single particle mode was improved 2-fold as compared to the LoD provided by the conventional mode. With regards to the biotinylated aptamer, the use of the conventional mode provided a 5-fold improvement of LoD as compared to that obtained for the single particle one. Using the optimized conditions, the best LoD of 2 pM was obtained with the biotinylated aptamer operating with conventional ICP-MS detection. When compared to previous reports using the same aptamer in a competitive assay, the developed method significantly improved the LoD by at least an order of magnitude. Different flour samples containing lupin were successfully analyzed according to European Conformity guidelines for the analysis of food contaminants.
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Affiliation(s)
- Daniel Torregrosa
- University of Alicante, Department of Analytical Chemistry, Nutrition and Food Sciences, PO Box 99, 03080, Alicante, Spain
| | - Miriam Jauset-Rubio
- INTERFIBIO Consolidated Research Group, Department of Chemical Engineering, Universitat Rovira i Virgili, 43007, Tarragona, Spain
| | - Raquel Serrano
- University of Alicante, Department of Analytical Chemistry, Nutrition and Food Sciences, PO Box 99, 03080, Alicante, Spain
| | - Marketa Svobodová
- INTERFIBIO Consolidated Research Group, Department of Chemical Engineering, Universitat Rovira i Virgili, 43007, Tarragona, Spain
| | - Guillermo Grindlay
- University of Alicante, Department of Analytical Chemistry, Nutrition and Food Sciences, PO Box 99, 03080, Alicante, Spain.
| | - Ciara K O'Sullivan
- INTERFIBIO Consolidated Research Group, Department of Chemical Engineering, Universitat Rovira i Virgili, 43007, Tarragona, Spain; Institució Catalana de Recerca i Estudis Avancats (ICREA), 08010, Barcelona, Spain
| | - Juan Mora
- University of Alicante, Department of Analytical Chemistry, Nutrition and Food Sciences, PO Box 99, 03080, Alicante, Spain
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3
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Le MUT, Shon HK, Nguyen HP, Lee CH, Kim KS, Na HK, Lee TG. Simultaneous Multiplexed Imaging of Biomolecules in Transgenic Mouse Brain Tissues Using Mass Spectrometry Imaging: A Multi-omic Approach. Anal Chem 2022; 94:9297-9305. [PMID: 35696262 DOI: 10.1021/acs.analchem.2c00676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The importance of multi-omic-based approaches to better understand diverse pathological mechanisms including neurodegenerative diseases has emerged. Spatial information can be of great help in understanding how biomolecules interact pathologically and in elucidating target biomarkers for developing therapeutics. While various analytical methods have been attempted for imaging-based biomolecule analysis, a multi-omic approach to imaging remains challenging due to the different characteristics of biomolecules. Time-of-flight secondary ion mass spectrometry (ToF-SIMS) is a powerful tool due to its sensitivity, chemical specificity, and high spatial resolution in visualizing chemical information in cells and tissues. In this paper, we suggest a new strategy to simultaneously obtain the spatial information of various kinds of biomolecules that includes both labeled and label-free approaches using ToF-SIMS. The enzyme-assisted labeling strategy for the targets of interest enables the sensitive and specific imaging of large molecules such as peptides, proteins, and mRNA, a task that has been, to date, difficult for any MS analysis. Together with the strength of the analytical performance of ToF-SIMS in the label-free tissue imaging of small biomolecules, the proposed strategy allows one to simultaneously obtain integrated information of spatial distribution of metabolites, lipids, peptides, proteins, and mRNA at a high resolution in a single measurement. As part of the suggested strategy, we present a sample preparation method suitable for MS imaging. Because a comprehensive method to examine the spatial distribution of multiple biomolecules in tissues has remained elusive, our strategy can be a useful tool to support the understanding of the interactions of biomolecules in tissues as well as pathological mechanisms.
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Affiliation(s)
- Minh-Uyen Thi Le
- Center for Nano-Bio Measurement, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Korea.,Department of Nano Science, University of Science and Technology (UST), Daejeon 34113, Korea
| | - Hyun Kyong Shon
- Center for Nano-Bio Measurement, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Korea
| | - Hong-Phuong Nguyen
- Department of Biomedical Science, Inha University College of Medicine, Incheon 22332, Korea
| | - Chul-Ho Lee
- Laboratory Animal Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Korea
| | - Kyoung-Shim Kim
- Laboratory Animal Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Korea
| | - Hee-Kyung Na
- Center for Nano-Bio Measurement, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Korea
| | - Tae Geol Lee
- Center for Nano-Bio Measurement, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Korea.,Department of Nano Science, University of Science and Technology (UST), Daejeon 34113, Korea
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Torregrosa D, Grindlay G, Gras L, Mora J. Immunoassays based on inductively coupled plasma mass spectrometry detection: So far so good, so what? Microchem J 2021. [DOI: 10.1016/j.microc.2021.106200] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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5
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Larraga-Urdaz AL, Sanchez MLF, Encinar JR, Costa-Fernandez JM. Signal amplification strategies for clinical biomarker quantification using elemental mass spectrometry. Anal Bioanal Chem 2021; 414:53-62. [PMID: 33674934 DOI: 10.1007/s00216-021-03251-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Revised: 02/18/2021] [Accepted: 02/24/2021] [Indexed: 11/29/2022]
Abstract
The current trends in modern medicine towards early diagnosis, or even prognosis, of different diseases have brought about the need for the corresponding biomarker detection at ever lower levels in really complex matrices. To do so, it is necessary to use proper extremely sensitive detection techniques such as elemental mass spectrometry. However, target labelling with metals for subsequent sensitive ICP-MS detection falls short nowadays even if resorting to inorganic nanoparticles containing a high number of detectable elements. Thus, new amplification strategies are being proposed to face this analytical challenge that will be critically discussed in this paper. Fundamentals of different novel strategies developed to achieve signal amplification and sensitive elemental mass spectrometry detection are here discussed. Some representative examples of relevant clinical applications are highlighted, along with future prospects and challenges.
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Affiliation(s)
- Andrea L Larraga-Urdaz
- Department of Physical and Analytical Chemistry, University of Oviedo, Avda. Julian Claveria, 8, 33006, Oviedo, Spain
| | - Maria L Fernandez Sanchez
- Department of Physical and Analytical Chemistry, University of Oviedo, Avda. Julian Claveria, 8, 33006, Oviedo, Spain
| | - Jorge Ruiz Encinar
- Department of Physical and Analytical Chemistry, University of Oviedo, Avda. Julian Claveria, 8, 33006, Oviedo, Spain.
| | - Jose M Costa-Fernandez
- Department of Physical and Analytical Chemistry, University of Oviedo, Avda. Julian Claveria, 8, 33006, Oviedo, Spain.
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6
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Jiang W, Sun G, Cui W, Men S, Jing M, Pu D, Zhang S, Yuan X, Zhang X, Wang C. Evaluation of an Element-Tagged Duplex Immunoassay Coupled with Inductively Coupled Plasma Mass Spectrometry Detection: A Further Study for the Application of the New Assay in Clinical Laboratory. Molecules 2020; 25:molecules25225370. [PMID: 33212898 PMCID: PMC7698432 DOI: 10.3390/molecules25225370] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 11/07/2020] [Accepted: 11/12/2020] [Indexed: 12/28/2022] Open
Abstract
Background: Element-tagged immunoassay coupled with inductively coupled plasma mass spectrometry (ICP-MS) detection has the potential to revolutionize immunoassay analysis for multiplex detection. However, a further study referring to the standard evaluation and clinical sample verification is needed to ensure its reliability for simultaneous analysis in clinical laboratories. Methods: Carcinoembryonic antigen (CEA) and α-fetoprotein (AFP) were chosen for the duplex immunoassay. The performance of the assay was evaluated according to guidelines from the Clinical and Laboratory Standards Institute (CLSI). Moreover, reference intervals (RIs) of CEA and AFP were established. At last, 329 clinical samples were analyzed by the proposed method and results were compared with those obtained with electrochemiluminescent immunoassay (ECLIA) method. Results: The measurement range of the assay was 2–940 ng/mL for CEA and 1.5–1000 ng/mL for AFP, with a detection limit of 0.94 ng/mL and 0.34 ng/mL, respectively. The inter-assay and intra-assay imprecision were all less than 6.58% and 10.62%, respectively. The RI of CEA and AFP was 0–3.84 ng/mL and 0–9.94 ng/mL, respectively. Regarding to clinical sample detection, no significant difference was observed between the proposed duplex assay and the ECLIA method. Conclusions: The ICP-MS-based duplex immunoassay was successfully developed and the analytical performance fully proved clinical applicability. Well, this could be different with other analytes.
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Affiliation(s)
- Wencan Jiang
- Department of Clinical Laboratory Medicine, Chinese People’s Liberation Army General Hospital & Postgraduate Medical School, Beijing 100853, China; (W.J.); (S.M.); (D.P.); (X.Y.)
| | - Gongwei Sun
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China; (G.S.); (S.Z.)
| | - Wenbin Cui
- Chromatography & Mass Spectrometry Thermo Fisher Scientific, China Commercial, Beijing 100853, China; (W.C.); (M.J.)
| | - Shasha Men
- Department of Clinical Laboratory Medicine, Chinese People’s Liberation Army General Hospital & Postgraduate Medical School, Beijing 100853, China; (W.J.); (S.M.); (D.P.); (X.Y.)
| | - Miao Jing
- Chromatography & Mass Spectrometry Thermo Fisher Scientific, China Commercial, Beijing 100853, China; (W.C.); (M.J.)
| | - Danna Pu
- Department of Clinical Laboratory Medicine, Chinese People’s Liberation Army General Hospital & Postgraduate Medical School, Beijing 100853, China; (W.J.); (S.M.); (D.P.); (X.Y.)
| | - Sichun Zhang
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China; (G.S.); (S.Z.)
| | - Xiaozhou Yuan
- Department of Clinical Laboratory Medicine, Chinese People’s Liberation Army General Hospital & Postgraduate Medical School, Beijing 100853, China; (W.J.); (S.M.); (D.P.); (X.Y.)
| | - Xinrong Zhang
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China; (G.S.); (S.Z.)
- Department of Chemistry, Tsinghua University, Beijing 100084, China
- Correspondence: (X.Z.); (C.W.); Tel.: +86-010-6277-6888 (X.Z.); +86-159-0105-6535 (C.W.); Fax: +86-010-6278-2485 (X.Z.); +86-010-6693-7771 (C.W.)
| | - Chengbin Wang
- Department of Clinical Laboratory Medicine, Chinese People’s Liberation Army General Hospital & Postgraduate Medical School, Beijing 100853, China; (W.J.); (S.M.); (D.P.); (X.Y.)
- Fuxing Road 28, Haidian district, Beijing 100853, China
- Correspondence: (X.Z.); (C.W.); Tel.: +86-010-6277-6888 (X.Z.); +86-159-0105-6535 (C.W.); Fax: +86-010-6278-2485 (X.Z.); +86-010-6693-7771 (C.W.)
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7
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Xu Y, Kang Q, Yang B, Chen B, He M, Hu B. A nanoprobe based on molybdenum disulfide nanosheets and silver nanoclusters for imaging and quantification of intracellular adenosine triphosphate. Anal Chim Acta 2020; 1134:75-83. [PMID: 33059868 DOI: 10.1016/j.aca.2020.08.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 08/01/2020] [Accepted: 08/08/2020] [Indexed: 12/25/2022]
Abstract
Adenosine triphosphate (ATP), as a high-energy phosphate compound that stores and releases energy in living cells, has an irreplaceable role in many physiological processes and maintenance of biological functions, and can be used as an indicator of many diseases. In this work, a composite nanoprobe, silver nanocluster (AgNC) @ molybdenum disulfide (MoS2), was designed to achieve in situ fluorescence imaging and quantitative analysis of intracellular ATP in HeLa cells by fluorescence spectrometry and inductively coupled plasma mass spectrometry (ICP-MS). The probe was constructed based on the adsorption of DNA-AgNCs by MoS2 nanosheets, and the DNA-AgNCs were prepared with the ATP aptamer as a template, whose fluorescence was initially quenched by MoS2. When the probe was incubated into the cells, intracellular ATP recognized the aptamer sequence and caused the DNA-AgNCs to fall off the MoS2 nanosheets, resulting in fluorescence recovery. Here, AgNCs not only acted as a fluorescence label for imaging, but also as an element tag for quantitative analysis of intracellular ATP with the detection of 107Ag by ICP-MS. The ATP in HeLa cells detected by this method was 24.6 ± 1.7 nmol L-1, which was in good agreement with the test result of the ATP test kit (20.4 ± 0.8 nmol L-1). The proposed method has potential application in medical clinical diagnosis and evaluation of the body's metabolic level via fluorescence imaging and ICP-MS detection of intracellular ATP.
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Affiliation(s)
- Yan Xu
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan, 430072, China
| | - Qi Kang
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan, 430072, China
| | - Bin Yang
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan, 430072, China
| | - Beibei Chen
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan, 430072, China
| | - Man He
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan, 430072, China
| | - Bin Hu
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan, 430072, China.
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Jiang W, Sun G, Wen X, Men S, Cui W, Jing M, Jia X, Hu Z, Pu D, Zhang S, Yuan X, Liu X, Zhang X, Wang C. Development and evaluation of an element-tagged immunoassay coupled with inductively coupled plasma mass spectrometry detection: can we apply the new assay in the clinical laboratory? Clin Chem Lab Med 2019; 58:873-882. [PMID: 31639100 DOI: 10.1515/cclm-2019-0566] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Accepted: 09/22/2019] [Indexed: 01/01/2023]
Abstract
Abstract
Introduction
Element-tagged immunoassay coupled with inductively coupled plasma-mass spectrometry (ICP-MS) detection has the potential to revolutionize immunoassay analysis in clinical detection; however, a systematic evaluation with the standard guidelines of the assay is needed to ensure its performance meets the requirements of the clinical laboratory.
Methods
Carcinoembryonic antigen (CEA) was chosen for analysis using the proposed method. A systematic evaluation of the proposed assay was carried out according to the Clinical and Laboratory Standards Institute (CLSI). The 469 clinical samples were analyzed using the new method and compared with the electrochemiluminescent immunoassay (ECLIA) method.
Results
The measurement range of the assay was 1–900 ng/mL, with a detection limit of 0.83 ng/mL. The inter-assay and intra-assay imprecision were 4.67% and 5.38% with high concentration samples, and 9.27% and 17.64% with low concentration samples, respectively. The cross-reactivity (%) for different antigens was less than 0.05%, and the recovery was between 94% and 108%. Percentage deviation of all the dilutions was less than 12.5% during linearity estimation. The interference bias caused by different substances was less than 10%. The reference interval of the assay was 0–4.442 ng/mL. Comparison with the commercial ECLIA method for clinical sample detection, the proposed method showed a correlation of 0.9878 and no significant differences between the methods were observed (p = 0.6666).
Conclusions
The ICP-MS based immunoassay was successfully developed, and the analytical performance of the assay met the requirements of the CLSI, which fully proved the clinical transferability and application of the new method.
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Affiliation(s)
- Wencan Jiang
- Department of Clinical Laboratory Medicine , Chinese People’s Liberation Army General Hospital and Postgraduate Medical School , Beijing , P.R. China
| | - Gongwei Sun
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry , Tsinghua University , Beijing , P.R. China
| | - Xinyu Wen
- Department of Clinical Laboratory Medicine , Chinese People’s Liberation Army General Hospital and Postgraduate Medical School , Beijing , P.R. China
| | - Shasha Men
- Department of Clinical Laboratory Medicine , Chinese People’s Liberation Army General Hospital and Postgraduate Medical School , Beijing , P.R. China
| | - Wenbin Cui
- Chromatography and Mass Spectrometry Thermo Fisher Scientific, China Commercial , Beijing , P.R. China
| | - Miao Jing
- Chromatography and Mass Spectrometry Thermo Fisher Scientific, China Commercial , Beijing , P.R. China
| | - Xingwang Jia
- Department of Clinical Laboratory Medicine , Chinese People’s Liberation Army General Hospital and Postgraduate Medical School , Beijing , P.R. China
| | - Zhian Hu
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry , Tsinghua University , Beijing , P.R. China
| | - Danna Pu
- Department of Clinical Laboratory Medicine , Chinese People’s Liberation Army General Hospital and Postgraduate Medical School , Beijing , P.R. China
| | - Sichun Zhang
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry , Tsinghua University , Beijing , P.R. China
| | - Xiaozhou Yuan
- Department of Clinical Laboratory Medicine , Chinese People’s Liberation Army General Hospital and Postgraduate Medical School , Beijing , P.R. China
| | - Xiaoting Liu
- Department of Clinical Laboratory Medicine , Chinese People’s Liberation Army General Hospital and Postgraduate Medical School , Beijing , P.R. China
| | - Xinrong Zhang
- Beijing Key Laboratory for Microanalytical Methods and Instrumentation, Department of Chemistry, Tsinghua University , Beijing 100084 , P.R. China , Phone: 0086-10-62776888, Fax: 0086-10-62782485
| | - Chengbin Wang
- Department of Clinical Laboratory Medicine, Chinese People’s Liberation Army General Hospital and Postgraduate Medical School , Fuxing Road 28, Haidian District , Beijing 100853 , P.R. China , Phone: +15901056535, Fax: 010-66937771
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9
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Lores-Padín A, Cruz-Alonso M, González-Iglesias H, Fernández B, Pereiro R. Bimodal determination of immunoglobulin E by fluorometry and ICP-MS by using platinum nanoclusters as a label in an immunoassay. Mikrochim Acta 2019; 186:705. [DOI: 10.1007/s00604-019-3868-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 09/20/2019] [Indexed: 12/18/2022]
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10
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Clases D, Gonzalez de Vega R, Bishop D, Doble P. SEC-ICP-MS and on-line isotope dilution analysis for characterisation and quantification of immunochemical assays. Anal Bioanal Chem 2019; 411:3553-3560. [DOI: 10.1007/s00216-019-01836-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 03/28/2019] [Accepted: 04/05/2019] [Indexed: 01/08/2023]
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Pérez E, Marco FM, Martínez-Peinado P, Mora J, Grindlay G. Evaluation of different competitive immunoassays for aflatoxin M 1 determination in milk samples by means of inductively coupled plasma mass spectrometry. Anal Chim Acta 2018; 1049:10-19. [PMID: 30612640 DOI: 10.1016/j.aca.2018.11.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 11/09/2018] [Accepted: 11/12/2018] [Indexed: 11/29/2022]
Abstract
Haptens (i.e. biomolecules which molecular weight is lower than 10 kDa) determination by inductively coupled plasma mass spectrometry (ICP-MS) is usually performed by means of competitive immunoassays. In these immunoassays, analyte quantification is indirectly carried out using two different tracer species (i.e. antibodies or antigen-protein conjugates). However, the benefits (and drawbacks) derived from using a given tracer species have not been systematically investigated so far. The goal of this work is to evaluate the influence of the tracer species employed in competitive immunoassays on the analytical figures of merit for aflatoxin M1 (AFM1) determination in milk samples. To this end, three different strategies have been developed and evaluated, namely: (i) antibody binding inhibition assay (ABIA); (ii) capture inhibition assay (CIA); and (iii) capture bridge inhibition assay (CBIA). Experimental results show that the use of the antibody as tracer species (as in the ABIA approach) affords better analytical figures of merit for AFM1 determination than using the antigen-protein conjugate as the tracer one (as in the CIA and CBIA strategies). The limit of detection afforded by ABIA strategy (i.e. 0.1 ng kg-1) for AFM1 determination was 1000-fold and 50-fold lower regarding the CIA and CBIA strategies, respectively. In the case of the ABIA approach, the characteristics of the metal nanoparticle label employed to detect the tracer species is critical on the analytical figures of merit. However, when the hapten-protein conjugates are used as tracer species, immunocomplex formation is severely hampered by steric effects caused by the protein moiety and, consequently, the characteristics of the metal nanoparticle label is not critical in the immunoassay performance. The different immunoassay strategies were successfully validated for AFM1 determination in milk samples using a certified reference material of whole milk powder (ERM-BD283) according to European Conformity guidelines for analytical methods of food contaminants and mycotoxins. Compared to ELISA, the immunoassay developed for AFM1 determination in milk samples improve limits of detection up to 10-fold.
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Affiliation(s)
- Emma Pérez
- Department of Analytical Chemistry, Nutrition and Food Sciences, University of Alicante, PO Box 99, 03080, Alicante, Spain
| | - Francisco M Marco
- Department of Biotechnology, University of Alicante, PO Box 99, 03080, Alicante, Spain
| | | | - Juan Mora
- Department of Analytical Chemistry, Nutrition and Food Sciences, University of Alicante, PO Box 99, 03080, Alicante, Spain
| | - Guillermo Grindlay
- Department of Analytical Chemistry, Nutrition and Food Sciences, University of Alicante, PO Box 99, 03080, Alicante, Spain.
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