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      Spot tests: past and present

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          Microchemistry, i.e., the chemistry performed at the scale of a microgram or less, has its roots in the late eighteenth and early nineteenth centuries. In the first half of the twentieth century a wide range of spot tests have been developed. For didactic reasons, they are still part of the curriculum of chemistry students. However, they are even highly important for applied analyses in conservation of cultural heritage, food science, forensic science, clinical and pharmacological sciences, geochemistry, and environmental sciences. Modern pregnancy tests, virus tests, etc. are the most recent examples of sophisticated spot tests. The present ChemTexts contribution aims to provide an overview of the past and present of this analytical methodology.

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          Is Open Access

          Development and clinical application of a rapid IgM‐IgG combined antibody test for SARS‐CoV‐2 infection diagnosis

          Abstract The outbreak of the novel coronavirus disease (COVID‐19) quickly spread all over China and to more than 20 other countries. Although the virus (severe acute respiratory syndrome coronavirus [SARS‐Cov‐2]) nucleic acid real‐time polymerase chain reaction (PCR) test has become the standard method for diagnosis of SARS‐CoV‐2 infection, these real‐time PCR test kits have many limitations. In addition, high false‐negative rates were reported. There is an urgent need for an accurate and rapid test method to quickly identify a large number of infected patients and asymptomatic carriers to prevent virus transmission and assure timely treatment of patients. We have developed a rapid and simple point‐of‐care lateral flow immunoassay that can detect immunoglobulin M (IgM) and IgG antibodies simultaneously against SARS‐CoV‐2 virus in human blood within 15 minutes which can detect patients at different infection stages. With this test kit, we carried out clinical studies to validate its clinical efficacy uses. The clinical detection sensitivity and specificity of this test were measured using blood samples collected from 397 PCR confirmed COVID‐19 patients and 128 negative patients at eight different clinical sites. The overall testing sensitivity was 88.66% and specificity was 90.63%. In addition, we evaluated clinical diagnosis results obtained from different types of venous and fingerstick blood samples. The results indicated great detection consistency among samples from fingerstick blood, serum and plasma of venous blood. The IgM‐IgG combined assay has better utility and sensitivity compared with a single IgM or IgG test. It can be used for the rapid screening of SARS‐CoV‐2 carriers, symptomatic or asymptomatic, in hospitals, clinics, and test laboratories.
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            Microfluidic diagnostic technologies for global public health.

            The developing world does not have access to many of the best medical diagnostic technologies; they were designed for air-conditioned laboratories, refrigerated storage of chemicals, a constant supply of calibrators and reagents, stable electrical power, highly trained personnel and rapid transportation of samples. Microfluidic systems allow miniaturization and integration of complex functions, which could move sophisticated diagnostic tools out of the developed-world laboratory. These systems must be inexpensive, but also accurate, reliable, rugged and well suited to the medical and social contexts of the developing world.
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              Enzyme-linked immunosorbent assay (ELISA). Quantitative assay of immunoglobulin G.

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                Author and article information

                Contributors
                tdomenec@crbc.upv.es
                Journal
                ChemTexts
                ChemTexts
                Chemtexts
                Springer International Publishing (Cham )
                2199-3793
                27 December 2021
                2022
                : 8
                : 1
                : 4
                Affiliations
                [1 ]GRID grid.157927.f, ISNI 0000 0004 1770 5832, Institut de Restauració del Patrimoni, , Universitat Politècnica de València, ; Camí de Vera 14, 46022 Valencia, Spain
                [2 ]GRID grid.5338.d, ISNI 0000 0001 2173 938X, Departament de Química Analítica, , Universitat de València. Dr. Moliner, ; 50, Burjassot, 46100 Valencia, Spain
                Author information
                http://orcid.org/0000-0003-3660-2161
                Article
                152
                10.1007/s40828-021-00152-z
                8710564
                61979054-dca5-4354-8bcc-e7a0104aecef
                © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021

                This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

                History
                : 15 June 2021
                : 11 October 2021
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/100014440, Ministerio de Ciencia, Innovación y Universidades;
                Award ID: PID2020-113022GB-I00
                Funded by: FundRef http://dx.doi.org/10.13039/501100011033, Agencia Estatal de Investigación;
                Award ID: PID2020-113022GB-I00
                Categories
                Lecture Text
                Custom metadata
                © Springer Nature Switzerland AG 2022

                spot tests,microchemistry,chemical microscopy,dipstick immunoassay,elisa,microfluidics,µpad,lab-on-a-chip,multiplexed tests,smartphone spectroscopy

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