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Xu J, Chen X, Zhou H, Zhao Y, Cheng Y, Wu Y, Zhang J, Chen J, Zhang S. Machine learning-assisted photoluminescent sensor array based on gold nanoclusters for the discrimination of antibiotics with test paper. Talanta 2024; 266:125122. [PMID: 37651910 DOI: 10.1016/j.talanta.2023.125122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 08/21/2023] [Accepted: 08/23/2023] [Indexed: 09/02/2023]
Abstract
Antibiotic residues accumulation in the environment endangers ecosystems and human health. There is an urgent need for a facile and efficient strategy to detect antibiotics. Here, we report a photoluminescent sensor array based on protein-stabilized gold nanoclusters (AuNCs) for the detection of two families of antibiotics, tetracyclines and quinolones. The nanoclusters were synthesized with bovine serum albumin (BSA) and ovalbumin (OVA), respectively. They had different interactions with seven kinds of antibiotics and exhibited diverse photoluminescence (PL) responses, which were analyzed by linear discriminant analysis and ExtraTrees algorithms. The sensor array performed well in both classification and quantification of seven antibiotics. And the quantitative results of all antibiotics obtained R2 of no less than 0.99 at 0-100 μM when using suitable regression models. Additionally, the sensor array was able to distinguish antibiotic mixtures and multiple interfering substances, and it also kept 100% classification accuracy in river water samples. Moreover, test paper assisted by a smartphone was applied for quick detection of antibiotics, with good performance in both HEPES buffer and river water. These studies reveal great potential for the point-of-use analysis of antibiotics in environmental monitoring.
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Affiliation(s)
- Jinming Xu
- State Key Laboratory of Precision Spectroscopy, East China Normal University, No.500, Dongchuan Rd., Shanghai, 200241, China
| | - Xihang Chen
- State Key Laboratory of Precision Spectroscopy, East China Normal University, No.500, Dongchuan Rd., Shanghai, 200241, China
| | - Huangmei Zhou
- State Key Laboratory of Precision Spectroscopy, East China Normal University, No.500, Dongchuan Rd., Shanghai, 200241, China
| | - Yu Zhao
- State Key Laboratory of Precision Spectroscopy, East China Normal University, No.500, Dongchuan Rd., Shanghai, 200241, China
| | - Yuchi Cheng
- State Key Laboratory of Precision Spectroscopy, East China Normal University, No.500, Dongchuan Rd., Shanghai, 200241, China
| | - Ying Wu
- State Key Laboratory of Estuarine and Coastal Research, East China Normal University, No.500, Dongchuan Rd., Shanghai, 200241, China.
| | - Jie Zhang
- Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, China
| | - Jinquan Chen
- State Key Laboratory of Precision Spectroscopy, East China Normal University, No.500, Dongchuan Rd., Shanghai, 200241, China; Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi, 030006, China
| | - Sanjun Zhang
- State Key Laboratory of Precision Spectroscopy, East China Normal University, No.500, Dongchuan Rd., Shanghai, 200241, China; Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi, 030006, China; NYU-ECNU Institute of Physics at NYU Shanghai, No.3663, North Zhongshan Rd., Shanghai, 200062, China.
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2
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de Oliveira JL, Toito Suarez W, Dos Santos VB, da Silva LP, Capitán-Vallvey LF. Using a cotton thread-based colorimetric sensor modified by carboxymethylcellulose and cuprizone with smartphone detection for quantification of copper. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:5683-5691. [PMID: 37861715 DOI: 10.1039/d3ay01541f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2023]
Abstract
In the present work, we report the development of a novel cotton thread-based colorimetric sensor modified by carboxymethylcellulose (CMC) and cuprizone (CPZ) with smartphone detection and its application for the quantitative determination of cupric ions in water and cachaça. The cotton thread/smartphone detection-based colorimetric method is an easily affordable, low-cost technique which allows one to perform real-time and on-field determination analyses, especially with limited financial resources. The method involves the complexation of Cu(II) with CPZ, which causes a change in the coloration of the cotton thread from a shade of white to blue in the detection zone of the colorimetric sensor. The immobilization of CPZ on CMC in the cotton thread leads to the pre-concentration of Cu(II) via a complexation mechanism with colorimetric reaction. The application of the colorimetric sensor allows the quantification of copper in the range from 1 to 12 mg L-1, with a low limit of detection of 0.21 mg L-1. In addition, the recovery assays conducted in samples of water and cachaça resulted in recovery percentages ranging from 84.9% to 107%, which is indicative of a precise method. To validate the precision of the proposed colorimetric method, the values obtained from the quantification analysis were compared with those of the flame atomic absorption spectrometry and a good agreement at the 95% confidence level was obtained.
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Affiliation(s)
- Josiane Lopes de Oliveira
- Department of Chemistry, Centre for Exact Sciences and Technology, Federal University of Viçosa - UFV, Viçosa, 36570-900, MG, Brazil
| | - Willian Toito Suarez
- Department of Chemistry, Centre for Exact Sciences and Technology, Federal University of Viçosa - UFV, Viçosa, 36570-900, MG, Brazil
| | - Vagner Bezerra Dos Santos
- Fundamental Chemistry Department, Federal University of Pernambuco - UFPE, Recife, 50740-560, PE, Brazil.
| | - Leandro Paulo da Silva
- Fundamental Chemistry Department, Federal University of Pernambuco - UFPE, Recife, 50740-560, PE, Brazil.
| | - Luis Fermin Capitán-Vallvey
- Department of Analytical Chemistry. Campus Fuentenueva, Faculty of Sciences, University of Granada, 18071, Spain
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3
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Choi MG, Han J, Ahn S, Chang SK. A colorimetric and fluorescent signaling probe for assaying Pd 2+ in practical samples. RSC Adv 2023; 13:31962-31968. [PMID: 37920198 PMCID: PMC10618942 DOI: 10.1039/d3ra05549c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 10/19/2023] [Indexed: 11/04/2023] Open
Abstract
We developed an optical signaling probe to detect Pd2+ ions in Pd-containing catalyst and drug candidate. The Pd2+ signaling probe (Res-DT) was readily prepared by reacting the versatile fluorochrome resorufin with phenyl chlorodithioformate. In a phosphate-buffered saline solution (pH 7.4) containing sodium dodecyl sulfate (SDS) as a signal-boosting surfactant, Res-DT exhibited a pronounced colorimetric response with a chromogenic yellow to magenta shift, leading to a substantial increase in the fluorescence intensity. The Pd2+ signaling performance of Res-DT was attributed to the Pd2+-promoted hydrolysis of the dithioate moiety. The probe displayed high selectivity toward Pd2+ ions and remained unaffected by commonly encountered coexisting components. Moreover, the detection limit of Res-DT for Pd2+ ions was 10 nM, and the signaling was achieved within 7 min. Furthermore, to demonstrate the real-world applicability of Res-DT, a Pd2+ assay was performed in Pd-containing catalyst and drug candidate using an office scanner as an easily accessible measurement device. Our results highlight the prospects of Res-DT as a tool to detect Pd2+ ions in various practical samples, with potential applications in catalysis, medicine, and environmental science.
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Affiliation(s)
- Myung Gil Choi
- Department of Chemistry, Chung-Ang University Seoul 06974 Republic of Korea +82 2 825 4736 +82 2 820 5199
| | - Juyoung Han
- Department of Chemistry, Chung-Ang University Seoul 06974 Republic of Korea +82 2 825 4736 +82 2 820 5199
| | - Sangdoo Ahn
- Department of Chemistry, Chung-Ang University Seoul 06974 Republic of Korea +82 2 825 4736 +82 2 820 5199
| | - Suk-Kyu Chang
- Department of Chemistry, Chung-Ang University Seoul 06974 Republic of Korea +82 2 825 4736 +82 2 820 5199
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4
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Li H, Zheng S, Tan QG, Zhan L, Martz TR, Ma J. Toward Citizen Science-Based Ocean Acidification Observations Using Smartphone Devices. Anal Chem 2023; 95:15409-15417. [PMID: 37734114 DOI: 10.1021/acs.analchem.3c03720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
pH is a key parameter in many chemical, biological, and biogeochemical processes, making it a fundamental aspect of environmental monitoring. Rapid and accurate seawater pH measurements are essential for effective ocean observation and acidification investigations, resulting in the need for novel solutions that allow robust, precise, and affordable pH monitoring. In this study, a versatile smartphone-based environmental analyzer (vSEA) was used for the rapid measurement of seawater pH in a field study. The feasibility of the use of the vSEA algorithm for pH quantification was explored and verified. When used in conjunction with a three-dimensional (3D)-printed light-proof shell, the quality of captured images is guaranteed. The quantitative accuracy of vSEA pH measurements reached 0.018 units with an uncertainty of <0.01, meeting the requirements of the Global Ocean Acidification Observing Network (GOA-ON) for "weather" goals (permitting a maximum pH uncertainty of 0.02). The vSEA-pH system was successfully applied for on-site pH measurements in coastal seawater and coral systems. The performance of the vSEA-pH system was validated using different real-world samples, and t-test results showed that the vSEA-pH system was consistent with pH measurements obtained using a state-of-the-art benchtop spectrophotometer (t = 1.986, p = 0.7949). The vSEA-pH system is applicable to different types of smartphone devices, making it possible for vSEA-pH to be widely promoted for public citizen use. The vSEA-pH system offers a simple, accurate, and applicable method for the on-site measurement of seawater pH, assisting the large-scale monitoring of ocean acidification by allowing the contribution of citizen science-based data collection.
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Affiliation(s)
- Hangqian Li
- State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, People's Republic of China
| | - Shulu Zheng
- State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, People's Republic of China
| | - Qiao-Guo Tan
- State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, People's Republic of China
| | - Liyang Zhan
- Third Institute of Oceanography, Key Laboratory of Global Change & Marine Atmospheric Chemistry, Ministry of Natural Resources, Xiamen 361000, People's Republic of China
| | - Todd R Martz
- Scripps Institution of Oceanography, University of California San Diego, San Diego, California 92093, United States
| | - Jian Ma
- State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, People's Republic of China
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5
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Vaishampayan V, Robita Chanu O, Sivasamy B, Ponnuchamy M, Karthik V, Pendharkar A, Srinivas Thotakura L, Prabhu A, Dhananjeyan V, Kapoor A. Microfluidic paper-based device coupled with 3D printed imaging box for colorimetric detection in resource-limited settings. HARDWAREX 2023; 15:e00456. [PMID: 37529685 PMCID: PMC10387609 DOI: 10.1016/j.ohx.2023.e00456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 06/11/2023] [Accepted: 07/11/2023] [Indexed: 08/03/2023]
Abstract
Rapid and effective methods for the detection of analytes such as water contaminants, food adulterants and biomolecules are essential for the protection of public health and environmental protection. Most of the currently established analytical techniques need sophisticated equipment, centralized testing facilities, costly operations, and trained personnel. Such limitations make them inaccessible to the general populace, particularly in regions with limited resources. The emergence of microfluidic devices offers a promising alternative to overcome several such constraints. This work describes a protocol for fabricating a low-cost, open-source paper-based microfluidic device using easily available tools and materials for colorimetric detection of analytes. The ease and simplicity of fabrication allow users to design customized devices. The device is coupled with an imaging box assembled from 3D printed parts to maintain uniform lighting conditions during analytical testing. The platform allows digital imaging using smartphones or cameras to instantaneously capture images of reaction zones on the device for quantitative analysis. The system is demonstrated for detecting hexavalent chromium, a toxic water contaminant. The image analysis is performed using open-source ImageJ for quantification of results. The approach demonstrated in this work can be readily adopted for a wide range of sensing applications.
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Affiliation(s)
- Vijay Vaishampayan
- Department of Chemical Engineering, Indian Institute of Technology, Ropar, Rupnagar, Punjab 140001, India
| | - Oinam Robita Chanu
- Department of Biomedical Engineering, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India
| | - Balasubramanian Sivasamy
- Department of Chemical Engineering, KPR Institute of Engineering and Technology, Coimbatore, Tamil Nadu 641407, India
| | - Muthamilselvi Ponnuchamy
- Department of Chemical Engineering, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India
| | - Varshini Karthik
- Department of Biomedical Engineering, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India
| | - Ambar Pendharkar
- Department of Chemical Engineering, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India
| | - Lohith Srinivas Thotakura
- Department of Chemical Engineering, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India
| | - Aryan Prabhu
- Department of Chemical Engineering, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu 603203, India
| | - Venkatesan Dhananjeyan
- Department of Chemical Engineering, Sathyabama Institute of Science and Technology, Chennai, Tamil Nadu 600119, India
| | - Ashish Kapoor
- Department of Chemical Engineering, Harcourt Butler Technical University, Kanpur, Uttar Pradesh 208002, India
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6
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Chunta S, Phongthai S, Jarujamrus P. Simple colorimetric assay using pectin hydrogel reagent coupled with camera-based photometry for trace arsenic determination. Anal Bioanal Chem 2023:10.1007/s00216-023-04762-z. [PMID: 37227457 DOI: 10.1007/s00216-023-04762-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 04/27/2023] [Accepted: 05/16/2023] [Indexed: 05/26/2023]
Abstract
Humans mainly ingest arsenic through contaminated drinking water, causing serious health effects. The World Health Organization (WHO) has set the permissible limit of arsenic in drinking water at 0.01 mg/L and concentrations should be regularly determined to ensure a safe supply. In this study, a leucomalachite green (LMG) pectin-based hydrogel reagent was prepared that selectively reacted with arsenic over other metals including manganese, copper, lead, iron, and cadmium. Pectin, optimized at 0.2% (w/v), was used to form the hydrogel matrix. Arsenic reacts with potassium iodate in sodium acetate buffer medium to liberate iodine that then oxidizes LMG entrapped in pectin hydrogel to form a blue product. Camera-based photometry/ImageJ software was used to monitor the color intensity, eliminating the need for a spectrophotometer. The intensity of gray in the red channel was chosen as optimal for the red, green, and blue (RGB) analysis. The colorimetric assay revealed a dynamic detection range toward arsenic solution standards of 0.003-1 mg/L, covering the WHO recommendation of below 0.01 mg/L arsenic in drinking water. The assay gave recovery rates between 97 and 109% at a 95% confidence interval, with precision of 4-9%. Concentrations of arsenic in the spiked drinking water, tap water, and pond water samples monitored by the developed method agreed well with conventional inductively coupled plasma optical emission spectrometry. This assay showed promise for on-site quantitative analysis of arsenic in water samples.
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Affiliation(s)
- Suticha Chunta
- Department of Clinical Chemistry, Faculty of Medical Technology, Prince of Songkla University, Hatyai, 90110, Songkhla, Thailand.
| | - Suphat Phongthai
- Division of Food Science and Technology, Faculty of Agro-Industry, Chiang Mai University, Chiang Mai, 50100, Thailand
| | - Purim Jarujamrus
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, 34190, Thailand
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7
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Wang C, Zhang Y, Liu C, Gou S, Hu S, Guo W. A portable colorimetric point-of-care testing platform for MicroRNA detection based on programmable entropy-driven dynamic DNA network modulated DNA-gold nanoparticle hybrid hydrogel film. Biosens Bioelectron 2023; 225:115073. [PMID: 36701948 DOI: 10.1016/j.bios.2023.115073] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 01/04/2023] [Accepted: 01/06/2023] [Indexed: 01/10/2023]
Abstract
Point-of-care testing (POCT) platforms for microRNA (miRNA) detection have attracted considerable attention in recent years, due to the increasingly important role of miRNA as biomarkers for the diagnosis of many diseases, such as cancers. However, several limitations such as the requirement of enzyme-related amplification system, expensive preservation cost, sophisticated analysis instruments and tedious operations of conventional miRNA biosensing devices severely hinder their widespread applications. In this work, a portable and smart colorimetric analysis platform was developed by employing the ultrathin DNA-gold nanoparticle (AuNP) hybrid hydrogel film as the signaling unit and the enzyme-free entropy-driven dynamic DNA network (EDN) as the signal converter and amplification unit. By programming the DNA sequences of the EDN, the EDN could respond to a specific miRNA, with miRNA-155 or miRNA-21 as the model target, and release a converter DNA with amplified concentration to further trigger the release of AuNPs from the hydrogel film as a colorimetric signal output. To avoid the use of sophisticated spectral instruments, digital analysis based on primary three-color channel (R/G/B) was further introduced by using user-friendly camera and image processing software, and a detection limit at pM level was achieved. Moreover, by introducing H2O2-mediated AuNPs enlargement procedure in the colorimetric analysis platform, the detection limit for miRNA target could further be enhanced to fM level. The POCT platform is also portable and storable with a good storage stability for at least 45 days, suggesting its great potential in practical diagnosis applications.
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Affiliation(s)
- Chunyan Wang
- Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin, 300071, PR China
| | - Yaxing Zhang
- Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin, 300071, PR China
| | - Chang Liu
- Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin, 300071, PR China
| | - Siyu Gou
- Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin, 300071, PR China
| | - Shanjin Hu
- Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin, 300071, PR China
| | - Weiwei Guo
- Research Center for Analytical Sciences, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin, 300071, PR China; Smart Sensing Interdisciplinary Science Center, School of Materials Science and Engineering, Nankai University, Tianjin, 300350, PR China.
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8
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Mousavizadegan M, Hosseini M, Sheikholeslami MN, Hamidipanah Y, Reza Ganjali M. Smartphone image analysis-based fluorescence detection of tetracycline using machine learning. Food Chem 2023; 403:134364. [DOI: 10.1016/j.foodchem.2022.134364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 09/12/2022] [Accepted: 09/18/2022] [Indexed: 11/06/2022]
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9
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Paper sensor-based method using a portable 3D-printed platform and smartphone-assisted colorimetric detection for ammonia and sulfide monitoring in anaerobic digesters and wastewater. Microchem J 2023. [DOI: 10.1016/j.microc.2023.108469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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10
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Firoozbakhtian A, Hosseini M, Sheikholeslami MN, Salehnia F, Xu G, Rabbani H, Sobhanie E. Detection of COVID-19: A Smartphone-Based Machine-Learning-Assisted ECL Immunoassay Approach with the Ability of RT-PCR CT Value Prediction. Anal Chem 2022; 94:16361-16368. [DOI: 10.1021/acs.analchem.2c03502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Ali Firoozbakhtian
- Nanobiosensors Lab, Department of Life Science Engineering, Faculty of New Sciences & Technologies, University of Tehran, Tehran1439817435, Iran
| | - Morteza Hosseini
- Nanobiosensors Lab, Department of Life Science Engineering, Faculty of New Sciences & Technologies, University of Tehran, Tehran1439817435, Iran
- National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran1439817435, Iran
| | - Mahsa Naghavi Sheikholeslami
- Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran1439817435, Iran
| | - Foad Salehnia
- Departament d’Enginyeria Electrònica, Escola Tècnica Superior d’Enginyeria, Universitat Rovira i Virgili, Avinguda dels Països Catalans 26, 43007Tarragona, Spain
| | - Guobao Xu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun130022, China
- University of Science and Technology of China, Hefei, Anhui230026, China
| | - Hodjattallah Rabbani
- Monoclonal Antibody Research Center, Avicenna Research Institute, ACECR, Tehran1439817435, Iran
| | - Ebtesam Sobhanie
- Nanobiosensors Lab, Department of Life Science Engineering, Faculty of New Sciences & Technologies, University of Tehran, Tehran1439817435, Iran
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11
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Ghasemi F, Fahimi-Kashani N, Bigdeli A, Alshatteri AH, Abbasi-Moayed S, Al-Jaf SH, Merry MY, Omer KM, Hormozi-Nezhad MR. Paper-based optical nanosensors – A review. Anal Chim Acta 2022; 1238:340640. [DOI: 10.1016/j.aca.2022.340640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 11/15/2022] [Accepted: 11/16/2022] [Indexed: 11/23/2022]
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12
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Pazzi BM, Pistoia D, Alberti G. RGB-Detector: A Smart, Low-Cost Device for Reading RGB Indexes of Microfluidic Paper-Based Analytical Devices. MICROMACHINES 2022; 13:1585. [PMID: 36295938 PMCID: PMC9611683 DOI: 10.3390/mi13101585] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 09/20/2022] [Accepted: 09/21/2022] [Indexed: 06/16/2023]
Abstract
A user-friendly, low-cost detector able to read the RGB indexes of microfluidic paper-based analytical devices (µPADs) was developed. The RGB-detector was built with 3D printing using PLA+ and reused Li-ion batteries. It is Arduino-based, which provides an easy interface between the sensor TCS3200, which reads the quadratic wave of the times corresponding to the RGB numbers, the Arduino itself, whose software translates the times into RGB values, and the touchscreen display, NX3224T028, which shows the results. This detector permits multi-sample analysis since it has a sample holder that can keep up to six µPADs simultaneously and rotate after the display's request. This work shows how the readings of the RGB indexes by the proposed RGB-detector implement the measurements' reproducibility. As a proof-of-concept, the RGB-detector application to a green array of µPADs for pH measurement coupled with chemometric analysis allowed us to achieve good results in terms of precision and agreement with the pH values measured by a classical pH-meter.
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13
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Azevedo Lemos V, Bastos Santos L, Santos Assis R. Deep eutectic solvent in ultrasound-assisted liquid-phase microextraction for determination of vanadium in food and environmental waters. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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14
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Park JH, Park EK, Cho YK, Shin IS, Lee H. Normalizing the Optical Signal Enables Robust Assays with Lateral Flow Biosensors. ACS OMEGA 2022; 7:17723-17731. [PMID: 35664567 PMCID: PMC9161384 DOI: 10.1021/acsomega.2c00793] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 03/25/2022] [Indexed: 06/04/2023]
Abstract
Lateral flow assays (LFAs) are widely adopted for fast, on-site molecular diagnostics. Obtaining high-precision assay results, however, remains challenging and often requires a dedicated optical setup to control the imaging environment. Here, we describe quick light normalization exam (qLiNE) that transforms ubiquitous smartphones into a robust LFA reader. qLiNE used a reference card, printed with geometric patterns and color standards, for real-time optical calibration: a photo of an LFA test strip was taken along with the card, and the image was processed using a smartphone app to correct shape distortion, illumination brightness, and color imbalances. This approach yielded consistent optical signal, enabling quantitative molecular analyses under different illumination conditions. We adapted qLiNE to detect cortisol, a known stress hormone, in saliva samples at point-of-use settings. The assay was fast (15 min) and sensitive (detection limit, 0.16 ng/mL). The serial qLiNE assay detected diurnal cycles of cortisol levels as well as stress-induced cortisol increase.
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Affiliation(s)
- Jin-Ho Park
- Center
for Systems Biology, Massachusetts General
Hospital, Boston, Massachusetts 02114, United States
- Department
of Radiology, Massachusetts General Hospital
and Harvard Medical School, Boston, Massachusetts 02114, United States
| | - Eung-Kyu Park
- QSTAG
CO., LTD., 165 Convencia-daero,
Yeonsu-gu, Incheon 21998, Republic of Korea
| | - Young Kwan Cho
- Center
for Systems Biology, Massachusetts General
Hospital, Boston, Massachusetts 02114, United States
- Department
of Chemistry, Kennedy College of Sciences, University of Massachusetts Lowell, Lowell, Massachusetts 01854, United States
| | - Ik-Soo Shin
- QSTAG
CO., LTD., 165 Convencia-daero,
Yeonsu-gu, Incheon 21998, Republic of Korea
- Department
of Chemistry, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul 06978, Republic
of Korea
| | - Hakho Lee
- Center
for Systems Biology, Massachusetts General
Hospital, Boston, Massachusetts 02114, United States
- Department
of Radiology, Massachusetts General Hospital
and Harvard Medical School, Boston, Massachusetts 02114, United States
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15
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A high-throughput, cheap, and green method for determination of ethanol in cachaça and vodka using 96-well-plate images. Talanta 2022; 241:123229. [DOI: 10.1016/j.talanta.2022.123229] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 01/11/2022] [Accepted: 01/12/2022] [Indexed: 12/22/2022]
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16
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Fluorimetric quantification of picric acid in aqueous medium via smartphone and invisible ink applications using pyrene based sensor. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109481] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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17
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Inagawa A, Kimura M, Uehara N. Total protein assay by PCA-based RGB-spectrum conversion methods with smartphone-acquired digital images. ANAL SCI 2022; 38:869-880. [PMID: 35325437 DOI: 10.1007/s44211-022-00107-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 03/07/2022] [Indexed: 11/01/2022]
Abstract
Total protein concentrations in the aqueous solutions were determined from the absorption spectra reproduced from smartphone-captured digital color images. We employed two different procedures for protein determination: the pyrogallol red molybdate method and Bradford's method. The principal-component-analysis-based reproduction process, which was previously reported by our research group, enabled the conversion of RGB values to score values for a linear combination of loading vectors to generate reproduced absorption spectra. The reproduced spectra were identical to those measured using a commercially available spectrophotometer. The total protein assays of commercial soymilk and human serum samples were carried out with both coloration reagents, and the obtained results were in good agreement with those attained using a conventional spectrophotometer. These results show that the proposed method enables smartphone-based ratiometric analysis of real samples without requiring any monochromating equipment.
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Affiliation(s)
- Arinori Inagawa
- Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi, 321-8585, Japan.
| | - Miwa Kimura
- Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi, 321-8585, Japan
| | - Nobuo Uehara
- Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi, 321-8585, Japan.
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18
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Santos LB, Assis RDSD, Silva UN, Lemos VA. Switchable-hydrophilicity solvent-based liquid-phase microextraction in an on-line system: Cobalt determination in food and water samples. Talanta 2022; 238:123038. [PMID: 34801895 DOI: 10.1016/j.talanta.2021.123038] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 11/02/2021] [Accepted: 11/03/2021] [Indexed: 01/03/2023]
Abstract
An on-line system employing switchable-hydrophilicity solvent-based liquid-phase microextraction (SHS-LPME) is described in this work. The method is based on the preconcentration of the species formed between cobalt and the reagent 1-nitroso-2-naphthol (NN), with subsequent detection by digital image colorimetry. The system's operation begins with the on-line mixture of sample, switchable solvent, and an alkaline agent in a reaction coil. Then the mixture is transported to an extraction chamber. The introduction of a proton donor leads to the passage of the solvent to its hydrophobic form, which allows phase separation. The rich phase is then directed to a glass tube, where detection is performed. Octanoic acid, sodium carbonate, and sulfuric acid were used as the extraction solvent, the alkaline agent, and the proton donor, respectively. Under optimized conditions, the method presented a detection limit of 0.8 μg L-1 and an enrichment factor of 41. The precision obtained was 4.8% (20 μg L-1). The accuracy of the method was tested by the analysis of Tomato Leaves certified reference material (NIST 1573a). The method was applied to the determination of cobalt in food, dietary supplements, and water samples. The method is presented as a green alternative and very accessible to the determination of cobalt in the analyzed samples.
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Affiliation(s)
- Luana Bastos Santos
- Universidade Estadual do Sudoeste da Bahia, Programa de Pós-Graduação em Química, Campus de Jequié, Jequié, Bahia, 45206-510, Brazil; Universidade Federal da Bahia, Programa de Pós-Graduação em Química, Campus Universitário de Ondina, Salvador, Bahia, 40170-280, Brazil
| | - Rosivan Dos Santos de Assis
- Universidade Estadual do Sudoeste da Bahia, Programa de Pós-Graduação em Química, Campus de Jequié, Jequié, Bahia, 45206-510, Brazil; Universidade Federal da Bahia, Programa de Pós-Graduação em Química, Campus Universitário de Ondina, Salvador, Bahia, 40170-280, Brazil
| | - Uneliton Neves Silva
- Universidade Estadual do Sudoeste da Bahia, Programa de Pós-Graduação em Química, Campus de Jequié, Jequié, Bahia, 45206-510, Brazil
| | - Valfredo Azevedo Lemos
- Universidade Estadual do Sudoeste da Bahia, Programa de Pós-Graduação em Química, Campus de Jequié, Jequié, Bahia, 45206-510, Brazil; Universidade Federal da Bahia, Programa de Pós-Graduação em Química, Campus Universitário de Ondina, Salvador, Bahia, 40170-280, Brazil.
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19
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Choi MG, Yun BH, Kim HM, Ahn S, Chang SK. Colorimetric screening of elevated urinary mercury levels by a novel Hg 2+-selective probe of resorufin phosphinothioate. RSC Adv 2022; 12:24107-24113. [PMID: 36093249 PMCID: PMC9400507 DOI: 10.1039/d2ra04093j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Accepted: 08/12/2022] [Indexed: 11/21/2022] Open
Abstract
Urinary mercury levels are the most reliable indicators of mercury exposure but identifying them requires complex techniques and heavy instruments. In this research, we reported a simple and convenient urinary mercury analysis method using a readily available office scanner. Probe MP-1 synthesized by the reaction of resorufin and dimethylthiophosphinoyl chloride revealed Hg2+-selective chromogenic and fluorescent signaling behavior. Signaling was realized through Hg2+-induced deprotection of the phosphinothioate protecting group in the resorufin-based probe MP-1 to yield the parent fluorochrome. A pronounced colorimetric response of color change from light yellow to pink alongside a turn-on type fluorescence enhancement was perceived exclusively toward Hg2+ ions over other metal ions and anions. The colorimetry provided a more advantageous ratiometric approach than the simple fluorometric analysis exhibiting an off–on type response, with a detection limit of 12 nM (2.4 ppb). The Hg2+ signaling of the MP-1 probe was not disturbed by the presence of coexisting metal ions and anions. The sensitive and convenient diagnosis of clinically important neurological symptoms and fatal inorganic mercury levels in urine was successfully demonstrated using a standard office scanner. A Hg2+ selective signaling probe, resorufin phosphinothioate, for the colorimetric diagnosis of clinically elevated mercury levels in urine samples using an office scanner was developed.![]()
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Affiliation(s)
- Myung Gil Choi
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Byung Hoon Yun
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Hyeong Min Kim
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Sangdoo Ahn
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Suk-Kyu Chang
- Department of Chemistry, Chung-Ang University, Seoul 06974, Republic of Korea
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20
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Lu Q, Liu Y, Liu Q, Liu J, Yang Q, Tang J, Meng Z, Su Q, Li S, Luo Y. Visual detection of aflatoxin B1 and zearalenone via activating a new catalytic reaction of “naked” DNAzyme. RSC Adv 2022; 12:32102-32109. [DOI: 10.1039/d2ra05683f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Accepted: 11/02/2022] [Indexed: 11/10/2022] Open
Abstract
It was found for the first time that the catalytic activity of “naked” DNAzyme can be modulated by aflatoxins and zearalenone to generate different color changes, which could be applied to the visual detection for the above two analytes.
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Affiliation(s)
- Qinrui Lu
- Medical Imaging Key Laboratory of Sichuan Province, North Sichuan Medical College, Nanchong 637000, P. R. China
- Department of Pharmacology, North Sichuan Medical College, Nanchong 637100, P. R. China
| | - Yue Liu
- Department of Pharmacology, North Sichuan Medical College, Nanchong 637100, P. R. China
| | - Qiao Liu
- Department of Pharmacology, North Sichuan Medical College, Nanchong 637100, P. R. China
| | - Jun Liu
- Department of Pharmacology, North Sichuan Medical College, Nanchong 637100, P. R. China
| | - Qin Yang
- Department of Pharmacology, North Sichuan Medical College, Nanchong 637100, P. R. China
| | - Jiancai Tang
- Department of Basic Medical Sciences, North Sichuan Medical College, Nanchong 637100, P. R. China
| | - Zhijun Meng
- Medical Imaging Key Laboratory of Sichuan Province, North Sichuan Medical College, Nanchong 637000, P. R. China
| | - Qiang Su
- Department of Pharmacy, The Second Clinical Medical College of North Sichuan Medical College, Nanchong Central Hospital, Nanchong 637000, P. R. China
- Nanchong Key Laboratory of Individualized Drug Therapy, Nanchong 637000, P. R. China
| | - Shengmao Li
- Department of Pharmacology, North Sichuan Medical College, Nanchong 637100, P. R. China
| | - Yingping Luo
- Medical Imaging Key Laboratory of Sichuan Province, North Sichuan Medical College, Nanchong 637000, P. R. China
- Department of Pharmacology, North Sichuan Medical College, Nanchong 637100, P. R. China
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21
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Gauri, Kumar D, Kaur N. Rigid anthraquinone based sensor for dual and differential colorimetric detection of Cu2+ and Ni2+ ions: Mimicking different molecular logic systems. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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22
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Inagawa A, Saito K, Fukuyama M, Numata M, Uehara N. Geometrical pH mapping of Microfluids by principal-component-analysis-based xyz-spectrum conversion method. Anal Chim Acta 2021; 1182:338952. [PMID: 34602207 DOI: 10.1016/j.aca.2021.338952] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 07/14/2021] [Accepted: 07/24/2021] [Indexed: 11/18/2022]
Abstract
The absorption spectra of bromothymol blue (BTB) solution introduced in microfluidic devices were reproduced by principal component analysis (PCA)-based xyz-spectrum conversion methods for geometric mapping of the pH values of fluids. We fabricated PDMS-made microfluidic devices with a channel depth of 1 mm to overcome the lower detection limits of transmittance image acquisition. Aqueous solutions of pH indicators under various pH conditions were hydrodynamically introduced into the channel, and RGB values of the region of interest (ROI) were obtained via image analysis. The xyz values were then converted into absorption spectral data of the pH indicator using the PCA-based spectral reproduction previously proposed by the authors. The high reproducibility of the spectra was confirmed to be comparable to that of the conventional method using a spectrophotometer. We applied the present method to elucidate the pH gradient at an aqueous biphasic interface in the microfluidic channels generated by contacting multiple laminar flows of two or three buffered solutions. We confirmed that the pH gradient ranged from approximately 70 to 140 μm, which is consistent with the results reported using other approaches. The results demonstrate the applicability of the present method to the fluctuation field in micro/nanospaces to acquire spectrophotometric information in the order of milliseconds without monochromating equipment.
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Affiliation(s)
- Arinori Inagawa
- Faculty of Engineering, Utsunomiya University, Utsunomiya, Tochigi, 321-8585, Japan.
| | - Kana Saito
- Faculty of Engineering, Utsunomiya University, Utsunomiya, Tochigi, 321-8585, Japan
| | - Mao Fukuyama
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi, 980-5877, Japan
| | - Munenori Numata
- Department of Biomolecular Chemistry, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Sakyo-ku, Kyoto 606-8522, Japan
| | - Nobuo Uehara
- Faculty of Engineering, Utsunomiya University, Utsunomiya, Tochigi, 321-8585, Japan.
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23
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Kingsborough RP, Wrobel AT, Kunz RR. Colourimetry for the sensitive detection of vapour-phase chemicals: State of the art and future trends. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2021.116397] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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24
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Abels K, Salvo-Halloran EM, White D, Ali M, Agarwal NR, Leung V, Ali M, Sidawi M, Capretta A, Brennan JD, Nease J, Filipe CDM. Quantitative Point-of-Care Colorimetric Assay Modeling Using a Handheld Colorimeter. ACS OMEGA 2021; 6:22439-22446. [PMID: 34497933 PMCID: PMC8412955 DOI: 10.1021/acsomega.1c03460] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 08/05/2021] [Indexed: 06/13/2023]
Abstract
Colorimetric assays typically offer a rapid and convenient method to assess analytes that span healthcare monitoring to water quality testing. However, such tests can only provide qualitative results when employed in resource-limited settings or require bulky and expensive equipment such as lab spectrophotometers to allow quantitative measurements. In this paper, we report on the use of a handheld colorimeter to quantitatively determine the concentration of analytes in a manner that is independent of ambient lighting or initial sample color. The method combines the response of the sensor with first-principles modeling that better describes the nature of the assay compared to linear-in-parameters regression modeling that is typically performed in other studies. This method was successfully demonstrated using a number of colorimetric assays: (1) determination of solution pH using a universal indicator, (2) quantification of the DNase presence using a DNA-gold nanoparticle assay, and (3) quantification of the concentration of the antibiotic tetracycline using a cell-based assay.
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Affiliation(s)
- Kristen Abels
- Department
of Chemical Engineering, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada
| | | | - Dawn White
- Biointerfaces
Institute, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada
| | - Monsur Ali
- Biointerfaces
Institute, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada
| | - Nisha R. Agarwal
- Biointerfaces
Institute, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada
- Nano-Imaging
and Spectroscopy Laboratory, Faculty of Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario L1G 0C5, Canada
| | - Vincent Leung
- Department
of Chemical Engineering, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada
| | - Muntakim Ali
- Department
of Chemical Engineering, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada
| | - Mariam Sidawi
- Department
of Chemical Engineering, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada
| | - Alfredo Capretta
- Biointerfaces
Institute, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada
| | - John D. Brennan
- Biointerfaces
Institute, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada
| | - Jake Nease
- Department
of Chemical Engineering, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada
| | - Carlos D. M. Filipe
- Department
of Chemical Engineering, McMaster University, 1280 Main St. West, Hamilton, Ontario L8S 4M1, Canada
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25
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Soda Y, Bakker E. Colorimetric ratiometry with ion optodes for spatially resolved concentration analysis. Anal Chim Acta 2021; 1154:338225. [PMID: 33736816 DOI: 10.1016/j.aca.2021.338225] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 01/10/2021] [Accepted: 01/12/2021] [Indexed: 11/30/2022]
Abstract
The deprotonation degree of the lipophilic pH indicator dye (chromoionophore) in ionophore-based ion optodes (so-called bulk optodes) has traditionally been measured spectrophotometrically. This makes it difficult to obtain spatially resolved concentration information, for example in the study of heterogenous systems. This article reports on a new colorimetric method that relies on a ratiometric image analysis. The acquision of image data allows one to map the deprotonation degree in two dimensions, which in turn is used to obtain the spatially-resolved ion concentration of the image. Using the detection of potassium as an example, the deprotonation degree data calculated on the basis of image analysis correlate quantitatively with those from spectrophotometry. They showed no dependence on the type of camera used in spite of their different gamma correction values and spectral sensitivities, as expected from theory. As an example, the method is successfully applied to the pixel level analysis of an ensemble of pictures acquired at different times to spatially and temporally observe potassium ion diffusion into an agarose gel containing a potassium-selective optical sensor microemulsion.
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Affiliation(s)
- Yoshiki Soda
- Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211, Geneva, Switzerland.
| | - Eric Bakker
- Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211, Geneva, Switzerland.
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26
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Gold-Modified Micellar Composites as Colorimetric Probes for the Determination of Low Molecular Weight Thiols in Biological Fluids Using Consumer Electronic Devices. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11062705] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This work describes a new, low-cost and simple-to-use method for the determination of free biothiols in biological fluids. The developed method utilizes the interaction of biothiols with gold ions, previously anchored on micellar assemblies through electrostatic interactions with the hydrophilic headgroup of cationic surfactant micelles. Specifically, the reaction of AuCl4− with the cationic surfactant cetyltrimethyl ammonium bromide (CTAB) produces an intense orange coloration, due to the ligand substitution reaction of the Br− for Cl− anions, followed by the coordination of the AuBr4− anions on the micelle surface through electrostatic interactions. When biothiols are added to the solution, they complex with the gold ions and disrupt the AuBr4−–CTAB complex, quenching the initial coloration and inducing a decrease in the light absorbance of the solution. Biothiols are assessed by monitoring their color quenching in an RGB color model, using a flatbed scanner operating in transmittance mode as an inexpensive microtiter plate photometer. The method was applied to determine the biothiol content in urine and blood plasma samples, with satisfactory recoveries (i.e., >67.3–123% using external calibration and 103.8–115% using standard addition calibration) and good reproducibility (RSD < 8.4%, n = 3).
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27
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Akrivi E, Kappi F, Gouma V, Vlessidis AG, Giokas DL, Kourkoumelis N. Biothiol modulated growth and aggregation of gold nanoparticles and their determination in biological fluids using digital photometry. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 249:119337. [PMID: 33360206 DOI: 10.1016/j.saa.2020.119337] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 12/02/2020] [Accepted: 12/08/2020] [Indexed: 06/12/2023]
Abstract
This work describes a novel and easy to use method for the determination of biologically important thiols that relies on their ability to inhibit the catalytic enlargement of AuNP seeds in the presence of ACl4- ions and trigger their aggregation. UV-vis spectroscopic monitoring of the plasmon resonance bands of the formed AuNPs showed that the spectral and color transitions depend both on the concentration and the structure of biothiols. The colorimetric changes induced by biothiols were quantified in the concentration range from 5 to 300 μM in the RGB color system with digital photometry using a commercially available flatbed scanner as detector. On the basis of these results, the applicability of the method was tested to the determination of glutathione in red blood cells and cysteine in blood plasma with satisfactory recoveries (88.7-96.5%), low detection limits (1.0 μM), good selectivity against major biomolecules under physiologically relevant conditions and satisfactory reproducibility (<8%). The method requires minimum technical expertise, is easy to use and is performed without scientific equipment, holding promise as a simple assay of biothiol testing even by non-experts.
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Affiliation(s)
- Elli Akrivi
- Department of Medical Physics, School of Health Sciences, University of Ioannina, Greece; Neurology Clinic, University Hospital of Ioannina, Greece
| | - Foteini Kappi
- Department of Chemistry, School of Natural Sciences, University of Ioannina, Greece
| | - Vasiliki Gouma
- Department of Chemistry, School of Natural Sciences, University of Ioannina, Greece
| | | | - Dimosthenis L Giokas
- Department of Chemistry, School of Natural Sciences, University of Ioannina, Greece.
| | - Nikolaos Kourkoumelis
- Department of Medical Physics, School of Health Sciences, University of Ioannina, Greece.
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28
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Hou P, Deng R, Guo J, Chen W, Li X, Yu HZ. A WiFi scanner in conjunction with disposable multiplex paper assay for the quantitation of disease markers in blood plasma. Anal Bioanal Chem 2021; 413:4625-4634. [PMID: 33661349 DOI: 10.1007/s00216-021-03234-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 02/05/2021] [Accepted: 02/10/2021] [Indexed: 12/30/2022]
Abstract
Herein we report a quantitative, multiplex assay for disease markers in plasma based on an integrated setup of a portable scanner and a disposable paper-based analytical device (PAD). The quantitative analysis relies on the digital colorimetric reading of the three-layer PAD with 30 assay sites for performing respective chromogenic reactions for plasma uric acid, glucose, and triglyceride, which are considered as important risk factors for cardiovascular diseases. A portable scanner with WiFi transmission capability was used to produce high-quality color images of the PADs and wirelessly transfer them to a smartphone or other mobile devices for data processing. The concentrations of biomarkers in both standard solutions and plasma samples can be directly obtained using a custom-designed smartphone app that is also capable of constructing calibration curves. The detection limits of uric acid, glucose, and triglyceride were determined to be 0.50 mg/dL, 0.84 mmol/L, and 14 mg/dL, respectively, which are below the normal limits and adequate for clinical validation. Owing to the distinct advantages-simple, portable, and cost-effective-this mobile assay protocol can be used for point-of-care (POC) settings or resource-limited situations, and potentially for the diagnosis and prevention of infectious diseases.
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Affiliation(s)
- Pengfei Hou
- College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, 030606, Shanxi, China
| | - Rong Deng
- College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, 030606, Shanxi, China
| | - Jiqiang Guo
- Shanxi Bethune Hospital, Taiyuan, 030032, Shanxi, China
| | - Weiyi Chen
- College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, 030606, Shanxi, China
| | - Xiaochun Li
- College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, 030606, Shanxi, China.
| | - Hua-Zhong Yu
- College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, 030606, Shanxi, China.
- Department of Chemistry and Department of Molecular Biology & Biochemistry, Simon Fraser University, Burnaby, British Columbia, V5A 1S6, Canada.
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29
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Fernandes GM, Silva WR, Barreto DN, Lamarca RS, Lima Gomes PCF, Flávio da S Petruci J, Batista AD. Novel approaches for colorimetric measurements in analytical chemistry - A review. Anal Chim Acta 2020; 1135:187-203. [PMID: 33070854 DOI: 10.1016/j.aca.2020.07.030] [Citation(s) in RCA: 84] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 07/13/2020] [Accepted: 07/14/2020] [Indexed: 01/20/2023]
Abstract
Colorimetric techniques have been developed and used in routine analyses for over a century and apparently all their potentialities have been exhaustively explored. However, colorimetric techniques have gained high visibility in the last two decades mainly because of the development of the miniaturization concept, for example, paper-based analytical devices that mostly employ colorimetric reactions, and by the advances and popularity of image capture instruments. The impressive increase in the use of these devices was followed by the development and enhancement of different modes of color detection to meet the demands of making qualitative, semi-quantitative, and fully quantitative analyses of multiple analytes. Cameras, scanners, and smartphones are now being used for this purpose and have become suitable alternatives for different approaches to colorimetric analysis; this, in addition to advancements in miniaturized devices. On the other hand, recent developments in optoelectronics technologies have launched more powerful, more stable and cheaper light-emitting diodes (LEDs), which once again have become an interesting tool for the design of portable and miniaturized devices based on colored reactions. Here, we present a critical review of recent developments and challenges of colorimetric detection in modern analytical chemistry in the last five years, and present thoughts and insights towards future perspectives in the area to improve the use of colorimetric detection in different application approaches.
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Affiliation(s)
- Gabriel Martins Fernandes
- Institute of Chemistry, Federal University of Uberlandia, Av. João Naves de Ávila, 2121, Uberlândia, MG, Brazil
| | - Weida R Silva
- Institute of Chemistry, Federal University of Uberlandia, Av. João Naves de Ávila, 2121, Uberlândia, MG, Brazil
| | - Diandra Nunes Barreto
- Institute of Chemistry, Federal University of Uberlandia, Av. João Naves de Ávila, 2121, Uberlândia, MG, Brazil
| | - Rafaela S Lamarca
- National Institute for Alternative Technologies for Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactive Materials (INCT-DATREM), Institute of Chemistry, São Paulo State University (UNESP), 14800-060, Araraquara, SP, Brazil
| | - Paulo Clairmont F Lima Gomes
- National Institute for Alternative Technologies for Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactive Materials (INCT-DATREM), Institute of Chemistry, São Paulo State University (UNESP), 14800-060, Araraquara, SP, Brazil
| | - João Flávio da S Petruci
- Institute of Chemistry, Federal University of Uberlandia, Av. João Naves de Ávila, 2121, Uberlândia, MG, Brazil
| | - Alex D Batista
- Institute of Chemistry, Federal University of Uberlandia, Av. João Naves de Ávila, 2121, Uberlândia, MG, Brazil.
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30
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Reproducing absorption spectra of pH indicators from RGB values of microscopic images. Talanta 2020; 216:120952. [PMID: 32456926 DOI: 10.1016/j.talanta.2020.120952] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 03/16/2020] [Accepted: 03/17/2020] [Indexed: 12/18/2022]
Abstract
Absorption spectra of pH indicators in aqueous solutions were reproduced from RGB values of microscopic images utilizing principal component analysis (PCA) and linear algebraic treatments. The reproduction of absorption spectra comprises the following three steps: (1) determining the loading spectra by PCA, (2) determining the conversion matrix from the RGB values to the score vectors, and (3) reproducing the absorption spectra by linear combination of the loading spectra and the score vectors. The reproducibility of the absorption spectra was demonstrated by employing bromothymol blue and methyl red solutions as pH indicators. The reproduced spectra of both indicators were in good agreement with the spectra measured with a conventional spectrophotometer. The pKa values of both indicators calculated from the reproduced spectra are in good agreement with those obtained from the spectrophotometric spectra and the literature values, confirming validity of the reproduction. This approach was applied to measure pH of freeze concentrated solutions in micro drains formed in ice. A change in pH was successfully observed on freezing and was compared with that reported in previous literature. Since this method does not necessitate the use of grating systems, spectral changes can be traced in milliseconds; this elucidates the phenomena occurring in fluctuating fields.
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Low-cost Point-of-Care Biosensors Using Common Electronic Components as Transducers. BIOCHIP JOURNAL 2020. [DOI: 10.1007/s13206-020-4104-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Abstract
Colorimetric measurements by image analysis, giving RGB or HSV data, have become commonplace with optical indicator-based assays and as a readout for paper-based analytical devices (PADs). Yet, most works on PADs tend to ignore the quantitative relationship between color data and concentration, which may hamper their establishment as analytical devices and make it difficult to properly understand chemical or biological reactions on the paper substrate. This Perspective Article discusses how image color data are computed into colorimetric absorbance values that correlate linearly to dye concentration and compare well to traditional spectrophotometry. Thioflavin T (ThT), Neutral Red (NR), and Orange IV are used here as model systems. Absorbance measurements in solution correlate well to image data (and Beer's law) from the color channel of relevance if the gamma correction normally used to render the picture more natural to the human eye is removed. This approach also allows one to correct for color cast and variable background color, which may otherwise limit quantitation in field measurements. Reflectance measurements on paper color spots are equally found to correlate quantitatively between spectroscopy and imaging devices. In this way, deviations from Beer's law are identified that are explained with dye interactions on the paper substrate.
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Affiliation(s)
- Yoshiki Soda
- Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
| | - Eric Bakker
- Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
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Yu W, Jiang C, Xie B, Wang S, Yu X, Wen K, Lin J, Wang J, Wang Z, Shen J. Ratiometric fluorescent sensing system for drug residue analysis: Highly sensitive immunosensor using dual-emission quantum dots hybrid and compact smartphone based-device. Anal Chim Acta 2019; 1102:91-98. [PMID: 32044000 DOI: 10.1016/j.aca.2019.12.037] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 12/09/2019] [Accepted: 12/15/2019] [Indexed: 01/23/2023]
Abstract
Immunoassays such as the enzyme-linked immunosorbent assay (ELISA) are utilized extensively for detecting protein biomarkers and small molecules in healthcare, environmental monitoring, and food analysis. Unfortunately, the current strategies for immunoassays often require sophisticated apparatus such as a microplate reader, which might not be available in resource-limited areas. To mitigate this problem, we designed a compact smartphone based-device and a multicolor response immunosensor. First, we designed a compact and cost-effective 3D-printed attachment, where a light-emitting diode was used as a light excitation source and a smartphone captured the fluorescent emission signals. Second, by combining quantum dots hybrid and chemical redox reaction, multiple color responses were displayed in the presence of the analyte at different concentrations. Third, solutions with distinct tonality could be readily distinguished by the naked eye and they were suitable for quantitative analysis using the hue-saturation-lightness color space based on a smartphone application. The versatility of the proposed sensing system was demonstrated by implementing an indirect competitive ELISA for analyzing trace drug residues in foodstuffs. The multicolor response of this sensing strategy allows us to visually quantify drug residues in foodstuffs. Moreover, the smartphone-based immunosensor can assess the exact concentration of the analyte by using a self-designed mobile application. The proposed assay provides a highly sensitive performance that the limit of detection was 0.37 ng/mL by visual detection and 0.057 ng/mL using the compact device. Due to its advantages in terms of portability, straightforward visual detection, high sensitivity, and cost effectiveness, the proposed immunosensor has great potential for applications in areas without access to laboratories or expensive infrastructure.
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Affiliation(s)
- Wenbo Yu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, And Beijing Laboratory for Food Quality and Safety, Beijing, 100193, People's Republic of China
| | - Chengxin Jiang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, People's Republic of China
| | - Bing Xie
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, And Beijing Laboratory for Food Quality and Safety, Beijing, 100193, People's Republic of China
| | - Siyuan Wang
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing, 100083, People's Republic of China
| | - Xuezhi Yu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, And Beijing Laboratory for Food Quality and Safety, Beijing, 100193, People's Republic of China
| | - Kai Wen
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, And Beijing Laboratory for Food Quality and Safety, Beijing, 100193, People's Republic of China
| | - Jianhan Lin
- Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture and Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University, Beijing, 100083, People's Republic of China
| | - Jing Wang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, People's Republic of China.
| | - Zhanhui Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, And Beijing Laboratory for Food Quality and Safety, Beijing, 100193, People's Republic of China.
| | - Jianzhong Shen
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Veterinary Medicine, China Agricultural University, Beijing Key Laboratory of Detection Technology for Animal-Derived Food Safety, And Beijing Laboratory for Food Quality and Safety, Beijing, 100193, People's Republic of China.
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Rodrigues CJC, Sanches JM, de Carvalho CCCR. Determining transaminase activity in bacterial libraries by time-lapse imaging. Chem Commun (Camb) 2019; 55:13538-13541. [PMID: 31647085 DOI: 10.1039/c9cc07507k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Transaminase activity was determined by time-lapse imaging using a colourimetric reaction and image analysis. A correlation between the benzaldehyde conversion and relative luminance was determined, allowing the identification of the most promising biocatalysts, the determination of kinetic parameters, and the assessment of the effect of the substrate concentration on activity.
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Affiliation(s)
- Carlos J C Rodrigues
- iBB-Institute for Bioengineering and Biosciences, Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal.
| | - João M Sanches
- Institute for Systems and Robotics (ISR/IST), LARSyS, Bioengineering Department, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
| | - Carla C C R de Carvalho
- iBB-Institute for Bioengineering and Biosciences, Department of Bioengineering, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal.
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35
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Mohamed AA, Mahmoud EHA, Khalil MMH. Development of a selective and sensitive colour reagent for gold and silver ions and its application to desktop scanner analysis. RSC Adv 2019; 9:36358-36365. [PMID: 35540597 PMCID: PMC9075269 DOI: 10.1039/c9ra06840f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 10/31/2019] [Indexed: 11/21/2022] Open
Abstract
Desktop scanners can be favorable alternatives to sophisticated spectrophotometers for the assessment of analytes in complex real samples. Distinctively, our method has been thoroughly investigated, optimized, validated and successfully applied to the assessment of silver and gold in complex real samples, applying syringal rhodanine (SR) as a novel specifically tailored chromogenic reagent and using a desktop scanner as a versatile sensor. Maximum colour absorbance was obtained in the presence of cetylpyridinium chloride (CPC) and cetyltrimethylammonium chloride (CTAC) for silver and gold chelates, respectively. For each metal ion, two ternary complexes were formed depending on the SR concentration with stoichiometries of 1 : 1 : 1 and 1 : 2 : 3 (Ag–SR–CPC) and 1 : 2 : 3 and 1 : 3 : 4 (Au–SR–CTAC), respectively. The methods adhered to Beer's law for 0.15–2.5 and 0.15–2.25 μg mL−1 with detection limits of 0.0089 and 0.0163 μg mL−1 for silver and gold, respectively. The molar absorptivities were 3.63 × 104 and 6.15 × 104 L mol−1 cm−1 at 550 nm and 554 nm, with Sandell's sensitivity indexes of 0.0029 and 0.0032 μg cm−2, respectively. The method was successfully applied to the assessment of silver and gold in a wide range of complex environmental samples. Desktop scanners can be favorable alternatives to sophisticated spectrophotometers for the assessment of analytes in complex real samples.![]()
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Affiliation(s)
- Ashraf A Mohamed
- Department of Chemistry, Faculty of Science, Ain Shams University Abbassia Cairo-11566 Egypt +20 224831836 +20 1001578849
| | - Eslam H A Mahmoud
- Department of Chemistry, Faculty of Science, Ain Shams University Abbassia Cairo-11566 Egypt +20 224831836 +20 1001578849
| | - Mostafa M H Khalil
- Department of Chemistry, Faculty of Science, Ain Shams University Abbassia Cairo-11566 Egypt +20 224831836 +20 1001578849
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Morais CLM, Lima KMG, Martin FL. Variable Selection Towards Classification of Digital Images: Identification of Altered Glucose Levels in Serum. ANAL LETT 2019. [DOI: 10.1080/00032719.2019.1607365] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Camilo L. M. Morais
- School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston, UK
| | - Kássio M. G. Lima
- Biological Chemistry and Chemometrics, Institute of Chemistry Federal University of Rio Grande do Norte, Natal, Brazil
| | - Francis L. Martin
- School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston, UK
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37
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de Oliveira LMA, Dos Santos VB, da Silva EKN, Lopes AS, Dantas-Filho HA. An environment-friendly spot test method with digital imaging for the micro-titration of citric fruits. Talanta 2019; 206:120219. [PMID: 31514888 DOI: 10.1016/j.talanta.2019.120219] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 07/26/2019] [Accepted: 08/01/2019] [Indexed: 12/17/2022]
Abstract
A new method to determine the total titratable acidity of orange, lemon and passion fruit, based on a spot test obtained from digital images and using anthocyanins as the biodegradable indicator, is presented for the first time. The colorimetric reactions were carried out by acid-base titration on a microscale, employing anthocyanin with a microplate for spot test purposes, with detection by digital imaging. To obtain highly precise data, a chamber based on a diffuser was developed to control the illumination supplied by the light emitting diodes, and coupled to a smartphone to acquire adequate digital images. High precision was obtained with a relative standard deviation of 0.758% for n = 95. The RGB values were extracted from the digital images and used as analytical signals, the values being correlated with the micro-volume of the titrant and used to construct the titration curves and obtain the first and second derivatives, respectively. For comparative purposes, the official AOAC (Association of Official Analytical Chemists) and MAPA (Ministry of Agriculture, Livestock and Food Supply of Brazil) methods were used and the results compared by applying the paired t-test at the 95% confidence level (n = 3). No difference was found between the values and the relative errors were less than 2.8%. The micro-titrimetric method was fast, uses anthocyanins as the natural indicator, is practical, and permits a reduction of 922 times or 99.9% of the volume required in a conventional titration. It is therefore ideal for routine analyses leading to a reduction in the waste generated, according to the principles of green chemistry.
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Affiliation(s)
| | - Vagner Bezerra Dos Santos
- Institute of Exact and Natural Science, Federal University of Pará, Belém, PA, Brazil; Fundamental Chemistry Department, Federal University of Pernambuco, Recife, PE, Brazil.
| | - Emelle K N da Silva
- Institute of Exact and Natural Science, Federal University of Pará, Belém, PA, Brazil
| | - Alessandra Santos Lopes
- Faculty of Food Engineering (FEA), Institute of Technology (ITEC), Federal University of Pará (UFPA), 66075-110, Belém, Pará, Brazil
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Hernández-Neuta I, Neumann F, Brightmeyer J, Ba Tis T, Madaboosi N, Wei Q, Ozcan A, Nilsson M. Smartphone-based clinical diagnostics: towards democratization of evidence-based health care. J Intern Med 2019; 285:19-39. [PMID: 30079527 PMCID: PMC6334517 DOI: 10.1111/joim.12820] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Recent advancements in bioanalytical techniques have led to the development of novel and robust diagnostic approaches that hold promise for providing optimal patient treatment, guiding prevention programs and widening the scope of personalized medicine. However, these advanced diagnostic techniques are still complex, expensive and limited to centralized healthcare facilities or research laboratories. This significantly hinders the use of evidence-based diagnostics for resource-limited settings and the primary care, thus creating a gap between healthcare providers and patients, leaving these populations without access to precision and quality medicine. Smartphone-based imaging and sensing platforms are emerging as promising alternatives for bridging this gap and decentralizing diagnostic tests offering practical features such as portability, cost-effectiveness and connectivity. Moreover, towards simplifying and automating bioanalytical techniques, biosensors and lab-on-a-chip technologies have become essential to interface and integrate these assays, bringing together the high precision and sensitivity of diagnostic techniques with the connectivity and computational power of smartphones. Here, we provide an overview of the emerging field of clinical smartphone diagnostics and its contributing technologies, as well as their wide range of areas of application, which span from haematology to digital pathology and rapid infectious disease diagnostics.
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Affiliation(s)
- I Hernández-Neuta
- Department of Biochemistry and Biophysics, Science for Life Laboratory, Stockholm University, Solna, SE, Sweden
| | - F Neumann
- Department of Biochemistry and Biophysics, Science for Life Laboratory, Stockholm University, Solna, SE, Sweden
| | - J Brightmeyer
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC, USA
| | - T Ba Tis
- Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, USA
| | - N Madaboosi
- Department of Biochemistry and Biophysics, Science for Life Laboratory, Stockholm University, Solna, SE, Sweden
| | - Q Wei
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC, USA
| | - A Ozcan
- Electrical and Computer Engineering Department, University of California Los Angeles, Los Angeles, CA, USA
| | - M Nilsson
- Department of Biochemistry and Biophysics, Science for Life Laboratory, Stockholm University, Solna, SE, Sweden
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Tsapakis S, Papaconstantinou D, Diagourtas A, Kandarakis S, Droutsas K, Andreanos K, Brouzas D. Home-based visual field test for glaucoma screening comparison with Humphrey perimeter. Clin Ophthalmol 2018; 12:2597-2606. [PMID: 30587906 PMCID: PMC6296209 DOI: 10.2147/opth.s187832] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Purpose To present a home-based visual field examination method using a PC monitor or virtual reality glasses and evaluate the reliability of the method by comparing the results with those of the Humphrey perimeter, in order to assess the possibility of glaucoma screening through the Internet. Materials and methods Software implementing a supra-threshold algorithm for the central 24° (52 points) of visual field at three threshold levels: 1) -4 db, 2) -8 db, and 3) -12 db, from the age-expected sensitivity was used for the purpose of testing. The software uses the web camera as a "virtual photometer" in order to detect room luminosity and allows self-testing using a computer monitor or virtual reality glasses using an Android smartphone with a 6-inch display. The software includes an expert system to analyze the visual field image and validate the reliability of the results. It also allows the physician to combine the results from two or more tests into a single test in order to achieve higher statistical accuracy of the final result. A total of ten patients, 20 eyes tested×52 points per eye=1,040 visual field test points, were compared point to point to those obtained using the Humphrey perimeter for the same patients, as they appeared randomly and consecutively at the glaucoma department within hours. Results Good receiver operating characteristic/area under the curve coefficient was found, ranging from 0.762 to 0.837 (P<0.001). Sensitivity ranged from 0.637 to 0.942, and specificity ranged from 0.735 to 0.497. Conclusion The home-based visual field test exhibits a reasonable receiver operating characteristic curve when compared to the Humphrey perimeter, without the need of specialized equipment. The test may be useful for glaucoma screening.
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Affiliation(s)
- Stylianos Tsapakis
- 1st Department of Ophthalmology, National and Kapodistrian University of Athens, Athens, Greece,
| | | | - Andreas Diagourtas
- 1st Department of Ophthalmology, National and Kapodistrian University of Athens, Athens, Greece,
| | - Stylianos Kandarakis
- 1st Department of Ophthalmology, National and Kapodistrian University of Athens, Athens, Greece,
| | - Konstantinos Droutsas
- 1st Department of Ophthalmology, National and Kapodistrian University of Athens, Athens, Greece,
| | - Konstantinos Andreanos
- 1st Department of Ophthalmology, National and Kapodistrian University of Athens, Athens, Greece,
| | - Dimitrios Brouzas
- 1st Department of Ophthalmology, National and Kapodistrian University of Athens, Athens, Greece,
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40
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Abstract
Point-of-care and in-field technologies for rapid, sensitive and selective detection of molecular biomarkers have attracted much interest. Rugged bioassay technology capable of fast detection of markers for pathogens and genetic diseases would in particular impact the quality of health care in the developing world, but would also make possible more extensive screening in developed countries to tackle problems such as those associated with water and food quality, and tracking of infectious organisms in hospitals and clinics. Literature trends indicate an increasing interest in the use of nanomaterials, and in particular luminescent nanoparticles, for assay development. These materials may offer attributes for development of assays and sensors that could achieve improvements in analytical figures of merit, and provide practical advantages in sensitivity and stability. There is opportunity for cost-efficiency and technical simplicity by implementation of luminescent nanomaterials as the basis for transduction technology, when combined with the use of paper substrates, and the ubiquitous availability of cell phone cameras and associated infrastructure for optical detection and transmission of results. Luminescent nanoparticles have been described for a broad range of bioanalytical targets including small molecules, oligonucleotides, peptides, proteins, saccharides and whole cells (e.g., cancer diagnostics). The luminescent nanomaterials that are described herein for paper-based bioassays include metal nanoparticles, quantum dots and lanthanide-doped nanocrystals. These nanomaterials often have broad and strong absorption and narrow emission bands that improve opportunity for multiplexed analysis, and can be designed to provide emission at wavelengths that are efficiently processed by conventional digital cameras. Luminescent nanoparticles can be embedded in paper substrates that are designed to direct fluid flow, and the resulting combination of technologies can offer competitive analytical performance at relatively low cost.
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Affiliation(s)
- Qiang Ju
- Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, P.R. China. and Chemical Sensors Group, Department of Chemical and Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Road, ON, Canada L5L 1C6.
| | - M Omair Noor
- Chemical Sensors Group, Department of Chemical and Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Road, ON, Canada L5L 1C6.
| | - Ulrich J Krull
- Chemical Sensors Group, Department of Chemical and Physical Sciences, University of Toronto Mississauga, 3359 Mississauga Road, ON, Canada L5L 1C6.
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Khramtsov P, Kropaneva M, Kalashnikova T, Bochkova M, Timganova V, Zamorina S, Rayev M. Highly Stable Conjugates of Carbon Nanoparticles with DNA Aptamers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:10321-10332. [PMID: 30089209 DOI: 10.1021/acs.langmuir.8b01255] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Conjugates of carbon nanoparticles and aptamers have great potential in many areas of biomedicine. In order to be implemented in practice, such conjugates should keep their properties throughout long storage period in commonly available conditions. In this work, we prepared conjugates of carbon nanoparticles (CNP) with DNA aptamers using streptavidin-biotin reaction. Obtained conjugates possess superior stability and kept their physical-chemical and functional properties during 30 days at +4 °C and -20 °C. Proposed approach to conjugation allows loading of about 100-120 pM of biotinylated aptamer per 1 mg of streptavidin-coated CNP (CNP-Str). Aptamer-functionalized CNP-Str have zeta potential of -34 mV at pH 7, mean diameter of 168-177 nm, and polydispersity index of 0.080-0.140. High reproducibility of functionalization was confirmed by preparation of several batches of CNP-aptamer with the same size distribution and aptamer loading using independently synthesized parent CNP-Str nanoparticles. Stability of CNP-aptamer conjugates was significantly enhanced by postsynthesis addition of EDTA that prevents nuclease degradation of immobilized aptamers. Obtained nanoparticles were stable at pH ranging from 6 to 10. Optical properties of CNP-aptamer nanoparticles were also studied and their ability to quench fluorescence via Förster resonance energy transfer was shown. Taking into account properties of CNP-aptamer conjugates, we suppose they may be used in both homo- and heterogeneous colorimetric, fluorescent, and aggregation-based assays.
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Affiliation(s)
- Pavel Khramtsov
- Department of Microbiology and Immunology, Biology Faculty , Perm State National Research University , 614000 , 15 Bukireva Street , Perm , Russia
- Laboratory of Ecological Immunology, Institute of Ecology and Genetics of Microorganisms of the Ural Branch of the Russian Academy of Sciences - branch of PSRC UB RAS, 614081 , 13 Goleva Street , Perm , Russia
| | - Maria Kropaneva
- Department of Microbiology and Immunology, Biology Faculty , Perm State National Research University , 614000 , 15 Bukireva Street , Perm , Russia
- Laboratory of Ecological Immunology, Institute of Ecology and Genetics of Microorganisms of the Ural Branch of the Russian Academy of Sciences - branch of PSRC UB RAS, 614081 , 13 Goleva Street , Perm , Russia
| | - Tatyana Kalashnikova
- Department of Microbiology and Immunology, Biology Faculty , Perm State National Research University , 614000 , 15 Bukireva Street , Perm , Russia
| | - Maria Bochkova
- Laboratory of Ecological Immunology, Institute of Ecology and Genetics of Microorganisms of the Ural Branch of the Russian Academy of Sciences - branch of PSRC UB RAS, 614081 , 13 Goleva Street , Perm , Russia
| | - Valeria Timganova
- Laboratory of Ecological Immunology, Institute of Ecology and Genetics of Microorganisms of the Ural Branch of the Russian Academy of Sciences - branch of PSRC UB RAS, 614081 , 13 Goleva Street , Perm , Russia
| | - Svetlana Zamorina
- Department of Microbiology and Immunology, Biology Faculty , Perm State National Research University , 614000 , 15 Bukireva Street , Perm , Russia
- Laboratory of Ecological Immunology, Institute of Ecology and Genetics of Microorganisms of the Ural Branch of the Russian Academy of Sciences - branch of PSRC UB RAS, 614081 , 13 Goleva Street , Perm , Russia
| | - Mikhail Rayev
- Department of Microbiology and Immunology, Biology Faculty , Perm State National Research University , 614000 , 15 Bukireva Street , Perm , Russia
- Laboratory of Ecological Immunology, Institute of Ecology and Genetics of Microorganisms of the Ural Branch of the Russian Academy of Sciences - branch of PSRC UB RAS, 614081 , 13 Goleva Street , Perm , Russia
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42
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Angelani CR, Carabias P, Cruz KM, Delfino JM, de Sautu M, Espelt MV, Ferreira-Gomes MS, Gómez GE, Mangialavori IC, Manzi M, Pignataro MF, Saffioti NA, Salvatierra Fréchou DM, Santos J, Schwarzbaum PJ. A metabolic control analysis approach to introduce the study of systems in biochemistry: the glycolytic pathway in the red blood cell. BIOCHEMISTRY AND MOLECULAR BIOLOGY EDUCATION : A BIMONTHLY PUBLICATION OF THE INTERNATIONAL UNION OF BIOCHEMISTRY AND MOLECULAR BIOLOGY 2018; 46:502-515. [PMID: 30281891 DOI: 10.1002/bmb.21139] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 06/05/2018] [Indexed: 06/08/2023]
Abstract
Metabolic control analysis (MCA) is a promising approach in biochemistry aimed at understanding processes in a quantitative fashion. Here the contribution of enzymes and transporters to the control of a given pathway flux and metabolite concentrations is determined and expressed quantitatively by means of numerical coefficients. Metabolic flux can be influenced by a wide variety of modulators acting on one or more metabolic steps along the pathway. We describe a laboratory exercise to study metabolic regulation of human erythrocytes (RBCs). Within the framework of MCA, students use these cells to determine the sensitivity of the glycolytic flux to two inhibitors (iodoacetic acid: IA, and iodoacetamide: IAA) known to act on the enzyme glyceraldehyde-3-phosphate-dehydrogenase. Glycolytic flux was estimated by determining the concentration of extracellular lactate, the end product of RBC glycolysis. A low-cost colorimetric assay was implemented, that takes advantage of the straightforward quantification of the absorbance signal from the photographic image of the multi-well plate taken with a standard digital camera. Students estimate flux response coefficients for each inhibitor by fitting an empirical function to the experimental data, followed by analytical derivation of this function. IA and IAA exhibit qualitatively different patterns, which are thoroughly analyzed in terms of the physicochemical properties influencing their action on the target enzyme. IA causes highest glycolytic flux inhibition at lower concentration than IAA. This work illustrates the feasibility of using the MCA approach to study key variables of a simple metabolic system, in the context of an upper level biochemistry course. © 2018 International Union of Biochemistry and Molecular Biology, 46(5):502-515, 2018.
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Affiliation(s)
- Carla R Angelani
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Pablo Carabias
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Karen M Cruz
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - José M Delfino
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Marilina de Sautu
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - María V Espelt
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Mariela S Ferreira-Gomes
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Gabriela E Gómez
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Irene C Mangialavori
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Malena Manzi
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - María F Pignataro
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Nicolás A Saffioti
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Damiana M Salvatierra Fréchou
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Javier Santos
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Pablo J Schwarzbaum
- Departamento de Química Biológica and Institute of Biochemistry and Biophysics (IQUIFIB, UBA-CONICET), Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires. Junín 956, C1113AAD, Buenos Aires, Argentina
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43
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Vidal M, Garcia-Arrona R, Bordagaray A, Ostra M, Albizu G. Simultaneous determination of color additives tartrazine and allura red in food products by digital image analysis. Talanta 2018; 184:58-64. [DOI: 10.1016/j.talanta.2018.02.111] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Revised: 02/23/2018] [Accepted: 02/27/2018] [Indexed: 11/29/2022]
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44
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Moonrungsee N, Peamaroon N, Boonmee A, Suwancharoen S, Jakmunee J. Evaluation of tyrosinase inhibitory activity in Salak (Salacca zalacca) extracts using the digital image-based colorimetric method. CHEMICAL PAPERS 2018. [DOI: 10.1007/s11696-018-0528-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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45
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Morais CLM, Lima KMG, Martin FL. Colourimetric Determination of High-Density Lipoprotein (HDL) Cholesterol Using Red–Green–Blue Digital Colour Imaging. ANAL LETT 2018. [DOI: 10.1080/00032719.2018.1453833] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Camilo L. M. Morais
- School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston, UK
| | - Kássio M. G. Lima
- Biological Chemistry and Chemometrics, Institute of Chemistry, Federal University of Rio Grande do Norte, Natal, Brazil
| | - Francis L. Martin
- School of Pharmacy and Biomedical Sciences, University of Central Lancashire, Preston, UK
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46
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Naked-Eye Detection of Glucose in Saliva with Bienzymatic Paper-Based Sensor. SENSORS 2018; 18:s18041071. [PMID: 29614003 PMCID: PMC5948659 DOI: 10.3390/s18041071] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Revised: 03/17/2018] [Accepted: 03/23/2018] [Indexed: 12/31/2022]
Abstract
The high incidence of Diabetes Mellitus in low-income regions has promoted the development of low-cost alternatives to replace blood-based procedures. In this work, we present a bienzymatic paper-based sensor suitable for the naked-eye detection of glucose in saliva samples. The sensor was obtained by a stamping procedure and modified with chitosan to improve the colorimetric readout. The bienzymatic reaction of GOx-HRP coupled with 2,4,6-tribromo-3-hydroxy benzoic acid was applied for the detection of glucose within a range from 0 to 180 mgdL−1 in buffer and artificial saliva solutions. The visual readout was perceived by the naked eye and registered with an office scanner to evaluate the analytical performance. The results showed a limit of detection of 0.37 mgdL−1 (S/N = 3) with an R.S.D. of 1.69% and a linear range from 1 to 22.5 mgdL−1 with an R2 of 0.99235. The analysis of human saliva samples was performed without pre-processing, achieving recoveries from 92 to 114%. The naked-eye detection was evaluated under two different light settings, showing average recoveries of 108.58 and 90.65% for standard and low illumination. The proposed device showed potential for easy-to-use, sensitive, low-cost, fast, and device-free detection of salivary glucose suitable for untrained personnel operation and limited facilities.
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47
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Chen P, Liu X, Goyal G, Tran NT, Shing Ho JC, Wang Y, Aili D, Liedberg B. Nanoplasmonic Sensing from the Human Vision Perspective. Anal Chem 2018. [DOI: 10.1021/acs.analchem.8b00597] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Peng Chen
- Centre for Biomimetic Sensor Science, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
| | - Xiaohu Liu
- Centre for Biomimetic Sensor Science, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
| | - Garima Goyal
- Centre for Biomimetic Sensor Science, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
- Interdisciplinary Graduate School, Nanyang Technological University, Singapore 639798
| | - Nhung Thi Tran
- Centre for Biomimetic Sensor Science, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
| | - James Chin Shing Ho
- Centre for Biomimetic Sensor Science, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
| | - Yi Wang
- Centre for Biomimetic Sensor Science, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
| | - Daniel Aili
- Division of Molecular Physics, Department of Physics, Chemistry and Biology, Linköping University, SE-58183 Linköping, Sweden
| | - Bo Liedberg
- Centre for Biomimetic Sensor Science, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Drive, Singapore 637553
- Interdisciplinary Graduate School, Nanyang Technological University, Singapore 639798
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48
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Compact detectors made of paired LEDs for photometric and fluorometric measurements on paper. Talanta 2018; 178:31-36. [DOI: 10.1016/j.talanta.2017.08.091] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 08/25/2017] [Accepted: 08/29/2017] [Indexed: 11/20/2022]
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49
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Mohamed AA, Shalaby AA, Salem A. The Yxy colour space parameters as novel signalling tools for digital imaging sensors in the analytical laboratory. RSC Adv 2018; 8:10673-10679. [PMID: 35540446 PMCID: PMC9078916 DOI: 10.1039/c8ra00209f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Accepted: 03/10/2018] [Indexed: 01/15/2023] Open
Abstract
Digital imaging devices can be promising, sensitive, and cost-effective chemical sensors for resource-limited settings and locally deprived communities.
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Affiliation(s)
- Ashraf A. Mohamed
- Department of Chemistry
- Faculty of Science
- Ain Shams University
- Cairo-11566
- Egypt
| | - Ahmed A. Shalaby
- Department of Chemistry
- Faculty of Science
- Ain Shams University
- Cairo-11566
- Egypt
| | - Abdelnaby M. Salem
- Department of Chemistry
- Faculty of Science
- Ain Shams University
- Cairo-11566
- Egypt
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50
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A smartphone colorimetric reader integrated with an ambient light sensor and a 3D printed attachment for on-site detection of zearalenone. Anal Bioanal Chem 2017; 409:6567-6574. [DOI: 10.1007/s00216-017-0605-2] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 08/06/2017] [Accepted: 08/24/2017] [Indexed: 12/23/2022]
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