1
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Zhao K, Zhang Z, Zhou Y, Lin X. Ag-CeO 2 Based on Electrochemical Sensor for High-Efficient On-Site Detection of Nitrite in Aquaculture Water and Beverages. Molecules 2024; 29:2644. [PMID: 38893519 PMCID: PMC11173993 DOI: 10.3390/molecules29112644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Revised: 05/28/2024] [Accepted: 05/28/2024] [Indexed: 06/21/2024] Open
Abstract
Nitrite is one of the most common nitrogenous compounds, which is not only an important indicator of aquaculture water but also widely used as a food additive. Its potential toxicity poses a huge threat to aquatic products and human health. Therefore, it is important to develop a convenient and rapid sensor for the high-efficient onsite detection of nitrite. In this work, a novel electrochemical sensor was developed for the qualitative and quantitative analysis of nitrite. The developed nitrite electrochemical detection system is easily applied in onsite detection. The electrochemical working electrode was constructed based on the combination of Ag-CeO2 and conductive carbon paste (CPE) with excellent electrocatalysis activity and rapid electron transfer ability. By the application of the developed system and under the optimal conditions, the linear range was from 40.0 μM to 500.0 μM, and the detection limit was reduced to 4.3 μM. The recovery was between 92.1% and 108.1%, and the relative standard deviations (RSDs) were 0.49%~9.31%. The sensor exhibited superior reproducibility, high stability sensitivity, and anti-interference ability, confirming its effectiveness for nitrite analysis. Finally, the developed electrochemical sensor was successfully applied to detect nitrite in beverages and aquaculture water samples, indicating that this approach has great potential in onsite food testing and environmental monitoring.
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Affiliation(s)
- Kunmeng Zhao
- College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
- College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China
| | - Ziyao Zhang
- College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
| | - Yihui Zhou
- College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
| | - Xuexia Lin
- College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
- College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China
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2
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Yang L, Li L, Liu R, Xie C, Zhao J, Chang W, Chen L, Yan Y, Zhang N, Zhang W, Liu B, Yang L. Cationic fluorescent carbon dots with solution ultra-stability and its rapid/on-site sensing application for HClO. Talanta 2024; 267:125137. [PMID: 37666083 DOI: 10.1016/j.talanta.2023.125137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 08/15/2023] [Accepted: 08/28/2023] [Indexed: 09/06/2023]
Abstract
Carbon dots (CDs) as a remarkable fluorescent nanomaterial have the advantages of easy preparation, good photostability and high sensitivity. However, the poor aqueous solution stability of carbon dots largely limited their practical application due to the characteristic of easily forming precipitation for long time storage. Here, a kind of cationic fluorescent carbon dots CDs-P(Ph)3 was designed by introducing a cationic compound, (4-carboxybutyl) triphenyl phosphonium bromide, to construct an electrostatic shell outside the dots. Such electrostatic shell could highly improve carbon dots stability in an aqueous solution to make CDs-P(Ph)3 stable for long-term storage with negligible aggregation. Meanwhile, the sensitivity of CDs-P(Ph)3 for hypochlorous acid (HClO) was also enhanced on the basis of the electron-withdrawing effect of cationic substituents on the surface of carbon dots. The limit of detection of CDs-P(Ph)3 for HClO was as low as ∼0.32 μM. Additionally, the fluorescence of CDs-P(Ph)3 could be rapid quenched by HClO with a quenching efficiency of more than 80% within 30 s. The excellent stability of CDs-P(Ph)3 in an aqueous solution made it suitable for on-site detecting HClO in real samples, such as tap, well and lake water. Such designed fluorescent nanomaterial would provide a practical application pathway for optical sensing detection in environmental samples.
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Affiliation(s)
- Linlin Yang
- Key Laboratory of Biomimetic Sensor and Detecting Technology of Anhui Province, School of Materials and Chemical Engineering, West Anhui University, Lu'an, Anhui, 237012, China
| | - Lingfei Li
- Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, China
| | - Renyong Liu
- Key Laboratory of Biomimetic Sensor and Detecting Technology of Anhui Province, School of Materials and Chemical Engineering, West Anhui University, Lu'an, Anhui, 237012, China
| | - Chenggen Xie
- Key Laboratory of Biomimetic Sensor and Detecting Technology of Anhui Province, School of Materials and Chemical Engineering, West Anhui University, Lu'an, Anhui, 237012, China
| | - Jun Zhao
- Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, China.
| | - Wengui Chang
- Key Laboratory of Biomimetic Sensor and Detecting Technology of Anhui Province, School of Materials and Chemical Engineering, West Anhui University, Lu'an, Anhui, 237012, China
| | - Lijuan Chen
- Key Laboratory of Biomimetic Sensor and Detecting Technology of Anhui Province, School of Materials and Chemical Engineering, West Anhui University, Lu'an, Anhui, 237012, China
| | - Yehan Yan
- Key Laboratory of Biomimetic Sensor and Detecting Technology of Anhui Province, School of Materials and Chemical Engineering, West Anhui University, Lu'an, Anhui, 237012, China
| | - Ningning Zhang
- School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252059, China
| | - Wei Zhang
- School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252059, China
| | - Bianhua Liu
- Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, China.
| | - Liang Yang
- Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, China.
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3
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Wang J, Zhou W, Liu Y, He G, Yang Y. Biomimetic Compound Eyes with Gradient Ommatidium Arrays. ACS APPLIED MATERIALS & INTERFACES 2023; 15:44503-44512. [PMID: 37675845 DOI: 10.1021/acsami.3c08063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
Compound eyes are high-performing natural optical perception systems with compact configurations, generating extensive research interest. Existing compound eye systems are often combinations of simple uniform microlens arrays; there are still challenges in making more ommatidia on the compound eye surface to focus to the same plane. Here, a biomimetic gradient compound eye is presented by artificially mimicking dragonflies. The multiple replication process efficiently endows compound eyes with the gradient characteristics of dragonfly compound eyes. Experimental results show that the manufactured compound eye allows multifocus imaging by virtue of the gradient ommatidium array arranged closely in a honeycomb pattern while ensuring excellent optical properties and compact configurations. Thousands of ommatidia showing a gradient trend at the millimeter scale while remaining relatively uniform at the micron scale have gradient focal lengths ranging from 260 to 450 μm. This gradient compound eye allows more ommatidia to focus on the same plane than traditional uniform compound eyes, which have experimentally been shown to capture more than 1100 in-plane clear images simultaneously, promising potential applications in micro-optical devices, optical imaging, and biochemical sensing.
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Affiliation(s)
- Jian Wang
- School of Physics & Technology, Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, Department of Clinical Laboratory, Institute of Medicine and Physics, Renmin Hospital, Wuhan University, Wuhan 430072, China
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Wenna Zhou
- School of Physics & Technology, Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, Department of Clinical Laboratory, Institute of Medicine and Physics, Renmin Hospital, Wuhan University, Wuhan 430072, China
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Yantong Liu
- School of Physics & Technology, Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, Department of Clinical Laboratory, Institute of Medicine and Physics, Renmin Hospital, Wuhan University, Wuhan 430072, China
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Guoqing He
- School of Physics & Technology, Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, Department of Clinical Laboratory, Institute of Medicine and Physics, Renmin Hospital, Wuhan University, Wuhan 430072, China
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Yi Yang
- School of Physics & Technology, Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, Department of Clinical Laboratory, Institute of Medicine and Physics, Renmin Hospital, Wuhan University, Wuhan 430072, China
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
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4
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Wang A, Feng X, He G, Xiao Y, Zhong T, Yu X. Recent advances in digital microfluidic chips for food safety analysis: Preparation, mechanism and application. Trends Food Sci Technol 2023. [DOI: 10.1016/j.tifs.2023.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
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5
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Guo Z, Liu F, Duan Q, Wang W, Wan Q, Huang Y, Zhao Y, Liu L, Feng Y, Xian L, Gao H, Long Y, Yao D, Lee J. A spectral learning path for simultaneous multi-parameter detection of water quality. ENVIRONMENTAL RESEARCH 2023; 216:114812. [PMID: 36395862 DOI: 10.1016/j.envres.2022.114812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 11/08/2022] [Accepted: 11/12/2022] [Indexed: 06/16/2023]
Abstract
Water quality parameters (WQP) are the most intuitive indicators of the environmental quality of water body. Due to the complexity and variability of the chemical environment of water body, simple and rapid detection of multiple parameters of water quality becomes a difficult task. In this paper, spectral images (named SPIs) and deep learning (DL) techniques were combined to construct an intelligent method for WQP detection. A novel spectroscopic instrument was used to obtain SPIs, which were converted into feature images of water chemistry and then combined with deep convolutional neural networks (CNNs) to train models and predict WQP. The results showed that the method of combining SPIs and DL has high accuracy and stability, and good prediction results with average relative error of each parameter (anions and cations, TOC, TP, TN, NO3--N, NH3-N) at 1.3%, coefficient of determination (R2) of 0.996, root mean square error (RMSE) of 0.1, residual prediction deviation (RPD) of 16.2, and mean absolute error (MAE) of 0.067. The method can achieve rapid and accurate detection of high-dimensional water quality multi-parameters, and has the advantages of simple pre-processing and low cost. It can be applied not only to the intelligent detection of environmental waters, but also has the potential to be applied in chemical, biological and medical fields.
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Affiliation(s)
- Zhiqiang Guo
- Laboratory of Environmental Aquatic Chemistry, Department of Environmental Science, Shaanxi Normal University, Xi'an, 710062, China
| | - Fenli Liu
- Laboratory of Environmental Aquatic Chemistry, Department of Environmental Science, Shaanxi Normal University, Xi'an, 710062, China
| | - Qiannan Duan
- Shaanxi Key Laboratory of Earth Surface System and Environmental Canying Capacity. College of Upban and Environmental Sciences, Northwest University, Xi'an, 710127, China.
| | - Wenjing Wang
- Laboratory of Environmental Aquatic Chemistry, Department of Environmental Science, Shaanxi Normal University, Xi'an, 710062, China
| | - Qianru Wan
- Laboratory of Environmental Aquatic Chemistry, Department of Environmental Science, Shaanxi Normal University, Xi'an, 710062, China
| | - Yicai Huang
- Laboratory of Environmental Aquatic Chemistry, Department of Environmental Science, Shaanxi Normal University, Xi'an, 710062, China
| | - Yuting Zhao
- Laboratory of Environmental Aquatic Chemistry, Department of Environmental Science, Shaanxi Normal University, Xi'an, 710062, China
| | - Lu Liu
- Laboratory of Environmental Aquatic Chemistry, Department of Environmental Science, Shaanxi Normal University, Xi'an, 710062, China
| | - Yunjin Feng
- Laboratory of Environmental Aquatic Chemistry, Department of Environmental Science, Shaanxi Normal University, Xi'an, 710062, China
| | - Libo Xian
- Xi'an 9th Sewage Treatment Plant, Chang'an Chengrun Operation Management Co., Ltd., Chang'an Urban Rural Development Co., Ltd., Xi'an, 710199, China
| | - Hang Gao
- Xi'an 9th Sewage Treatment Plant, Chang'an Chengrun Operation Management Co., Ltd., Chang'an Urban Rural Development Co., Ltd., Xi'an, 710199, China
| | - Yiwen Long
- Xi'an 9th Sewage Treatment Plant, Chang'an Chengrun Operation Management Co., Ltd., Chang'an Urban Rural Development Co., Ltd., Xi'an, 710199, China
| | - Dan Yao
- Xi'an 9th Sewage Treatment Plant, Chang'an Chengrun Operation Management Co., Ltd., Chang'an Urban Rural Development Co., Ltd., Xi'an, 710199, China
| | - Jianchao Lee
- Laboratory of Environmental Aquatic Chemistry, Department of Environmental Science, Shaanxi Normal University, Xi'an, 710062, China.
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6
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Li Z, Liu H, Wang D, Zhang M, Yang Y, Ren TL. Recent advances in microfluidic sensors for nutrients detection in water. Trends Analyt Chem 2023. [DOI: 10.1016/j.trac.2022.116790] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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7
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Chen L, Yu L, Liu Y, Xu H, Ma L, Tian P, Zhu J, Wang F, Yi K, Xiao H, Zhou F, Yang Y, Cheng Y, Bai L, Wang F, Zhu Y. Space-time-regulated imaging analyzer for smart coagulation diagnosis. Cell Rep Med 2022; 3:100765. [PMID: 36206751 PMCID: PMC9589004 DOI: 10.1016/j.xcrm.2022.100765] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Revised: 07/26/2022] [Accepted: 09/14/2022] [Indexed: 11/07/2022]
Abstract
The development of intelligent blood coagulation diagnoses is awaited to meet the current need for large clinical time-sensitive caseloads due to its efficient and automated diagnoses. Herein, a method is reported and validated to realize it through artificial intelligence (AI)-assisted optical clotting biophysics (OCB) properties identification. The image differential calculation is used for precise acquisition of OCB properties with elimination of initial differences, and the strategy of space-time regulation allows on-demand space time OCB properties identification and enables diverse blood function diagnoses. The integrated applications of smartphones and cloud computing offer a user-friendly automated analysis for accurate and convenient diagnoses. The prospective assays of clinical cases (n = 41) show that the system realizes 97.6%, 95.1%, and 100% accuracy for coagulation factors, fibrinogen function, and comprehensive blood coagulation diagnoses, respectively. This method should enable more low-cost and convenient diagnoses and provide a path for potential diagnostic-markers finding. An ultraportable optofluidic analyzer empowers convenient coagulation diagnoses The system enables optical clotting biophysics (OCB) properties acquisition and process Coagulation function diagnoses uses intelligent OCB properties identification Space-time regulation of OCB properties endow it capability to diverse diagnoses
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Affiliation(s)
- Longfei Chen
- Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, School of Physics & Technology, Wuhan University, Wuhan 430072, China; Renmin Hospital, Wuhan University, Wuhan 430060, China; Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Le Yu
- Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, School of Physics & Technology, Wuhan University, Wuhan 430072, China; Renmin Hospital, Wuhan University, Wuhan 430060, China; Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Yantong Liu
- Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, School of Physics & Technology, Wuhan University, Wuhan 430072, China; Renmin Hospital, Wuhan University, Wuhan 430060, China; Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Hongshan Xu
- Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, School of Physics & Technology, Wuhan University, Wuhan 430072, China
| | - Linlu Ma
- Department of Hematology, Zhongnan Hospital, Wuhan University, Wuhan 430071, China
| | - Pengfu Tian
- Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, School of Physics & Technology, Wuhan University, Wuhan 430072, China
| | - Jiaomeng Zhu
- Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, School of Physics & Technology, Wuhan University, Wuhan 430072, China
| | - Fang Wang
- Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, School of Physics & Technology, Wuhan University, Wuhan 430072, China
| | - Kezhen Yi
- Department of Laboratory Medicine, Zhongnan Hospital, Wuhan University, Wuhan 430071, China
| | - Hui Xiao
- Department of Hematology, Zhongnan Hospital, Wuhan University, Wuhan 430071, China
| | - Fuling Zhou
- Department of Hematology, Zhongnan Hospital, Wuhan University, Wuhan 430071, China
| | - Yi Yang
- Key Laboratory of Artificial Micro- and Nano- Structures of Ministry of Education, School of Physics & Technology, Wuhan University, Wuhan 430072, China; Renmin Hospital, Wuhan University, Wuhan 430060, China; Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China.
| | | | - Long Bai
- School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310002, China
| | - Fubing Wang
- Department of Laboratory Medicine, Zhongnan Hospital, Wuhan University, Wuhan 430071, China
| | - Yimin Zhu
- School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310002, China
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8
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An Optofluidic Monitor with On-Chip Calibration for Online Analyzing Surface Water Quality. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2022. [DOI: 10.1007/s13369-022-07205-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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9
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Monolithic Integrated OLED–OPD Unit for Point-of-Need Nitrite Sensing. SENSORS 2022; 22:s22030910. [PMID: 35161655 PMCID: PMC8838366 DOI: 10.3390/s22030910] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/14/2022] [Accepted: 01/21/2022] [Indexed: 02/06/2023]
Abstract
In this study, we present a highly integrated design of organic optoelectronic devices for Point-of-Need (PON) nitrite (NO2−) measurement. The spectrophotometric investigation of nitrite concentration was performed utilizing the popular Griess reagent and a reflection-based photometric unit with an organic light emitting diode (OLED) and an organic photodetector (OPD). In this approach a nitrite concentration dependent amount of azo dye is formed, which absorbs light around ~540 nm. The organic devices are designed for sensitive detection of absorption changes caused by the presence of this azo dye without the need of a spectrometer. Using a green emitting TCTA:Ir(mppy)3 OLED (peaking at ~512 nm) and a DMQA:DCV3T OPD with a maximum sensitivity around 530 nm, we successfully demonstrated the operation of the OLED–OPD pair for nitrite sensing with a low limit of detection 46 µg/L (1.0 µM) and a linearity of 99%. The hybrid integration of an OLED and an OPD with 0.5 mm × 0.5 mm device sizes and a gap of 0.9 mm is a first step towards a highly compact, low cost and highly commercially viable PON analytic platform. To our knowledge, this is the first demonstration of a fully organic-semiconductor-based monolithic integrated platform for real-time PON photometric nitrite analysis.
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Abstract
Optofluidics represents the interaction of light and fluids on a chip that integrates microfluidics and optics, which provides a promising optical platform for manipulating and analyzing fluid samples. Recent years have witnessed a substantial growth in optofluidic devices, including the integration of optical and fluidic control units, the incorporation of diverse photonic nanostructures, and new applications. All these advancements have enabled the implementation of optofluidics with improved performance. In this review, the recent advances of fabrication techniques and cutting-edge applications of optofluidic devices are presented, with a special focus on the developments of imaging and sensing. Specifically, the optofluidic based imaging techniques and applications are summarized, including the high-throughput cytometry, biochemical analysis, and optofluidic nanoparticle manipulation. The optofluidic sensing section is categorized according to the modulation approaches and the transduction mechanisms, represented by absorption, reflection/refraction, scattering, and plasmonics. Perspectives on future developments and promising avenues in the fields of optofluidics are also provided.
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11
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Chen J, Li S, Xu F, Zhang Q. Electrochemical Probe of the Reduced Graphene Oxide Modified by Bare Gold Nanoparticles Functionalized Zr(IV)‐based Metal‐organic Framework for Detecting Nitrite. ELECTROANAL 2021. [DOI: 10.1002/elan.202100209] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jing Chen
- Key Lab of Bioelectrochemistry & Environmental Analysis of Gansu College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 P. R. China
| | - Shuying Li
- Key Lab of Bioelectrochemistry & Environmental Analysis of Gansu College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 P. R. China
| | - Fanghong Xu
- Key Lab of Bioelectrochemistry & Environmental Analysis of Gansu College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 P. R. China
| | - Qian Zhang
- Key Lab of Bioelectrochemistry & Environmental Analysis of Gansu College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 P. R. China
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12
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Tang J, Cao X, Qiu G, deMello A, Wang J. Optical-Switch-Enabled Microfluidics for Sensitive Multichannel Colorimetric Analysis. Anal Chem 2021; 93:6784-6791. [PMID: 33877822 DOI: 10.1021/acs.analchem.1c00674] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The implementation of colorimetric analysis within microfluidic environments engenders significant benefits with respect to reduced sample and reagent consumption, system miniaturization, and real-time measurement of flowing samples. That said, conventional approaches to colorimetric analysis within microfluidic channels are hampered by short optical pathlengths and single-channel configurations, which lead to poor detection sensitivities and low analytical throughputs. Although the use of multiplexed light source/photodetector modules allows for multichannel analysis, such configurations significantly increase both instrument complexity and cost. To address these issues, we present a four-channel colorimetric measurement scheme within an optical-switch-enabled microfluidic chip (OSEMC) fabricated by two-photon stereolithography. The integration of optical switches enables sequential signal readout from each detection channel, and thus, only a single light source and a photodetector are required for operation. Optical switches can be controlled in a bespoke manner by changing the medium in the switch channel between a "light-transmitting" fluid and a "light-blocking" fluid using pneumatic microvalves. Such optical switches are characterized by fast response times (approximately 200 ms), tunable switching frequencies (between 0.1 and 1.0 Hz studied), and excellent stability. Operational performance demonstrates both good sensitivity and reproducibility through the colorimetric analysis of nitrite and ammonium samples using four detection channels. Furthermore, the use of OSEMC for parallel and real-time analysis of flowing samples is investigated via characterization of the adsorption kinetics of tartrazine on activated charcoal and the catalytic reaction kinetics of horseradish peroxidase (HRP).
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Affiliation(s)
- Jiukai Tang
- Institute of Environmental Engineering, ETH Zürich, Zürich 8093, Switzerland.,Laboratory for Advanced Analytical Technologies, Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf 8600, Switzerland
| | - Xiaobao Cao
- Institute of Chemical and Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, Zürich 8093, Switzerland
| | - Guangyu Qiu
- Institute of Environmental Engineering, ETH Zürich, Zürich 8093, Switzerland.,Laboratory for Advanced Analytical Technologies, Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf 8600, Switzerland
| | - Andrew deMello
- Institute of Chemical and Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, Zürich 8093, Switzerland
| | - Jing Wang
- Institute of Environmental Engineering, ETH Zürich, Zürich 8093, Switzerland.,Laboratory for Advanced Analytical Technologies, Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf 8600, Switzerland
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Wang F, Zhu J, Hu X, Chen L, Zuo Y, Yang Y, Jiang F, Sun C, Zhao W, Han X. Rapid nitrate determination with a portable lab-on-chip device based on double microstructured assisted reactors. LAB ON A CHIP 2021; 21:1109-1117. [PMID: 33527941 DOI: 10.1039/d0lc01057j] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Determining the nitrate levels is critical for water quality monitoring, and traditional methods are limited by high toxicity and low detection efficiency. Here, rapid nitrate determination was realized using a portable device based on innovative three-dimensional double microstructured assisted reactors (DMARs). On-chip nitrate reduction and chromogenic reaction were conducted in the DMARs, and the reaction products then flowed into a PMMA optical detection chip for absorbance measurement. A significant enhancement of reaction rate and efficiency was observed in the DMARs due to their sizeable surface-area-to-volume ratios and hydrodynamics in the microchannels. The highest reduction ratio of 94.8% was realized by optimizing experimental parameters, which is greatly improved compared to conventional zinc-cadmium based approaches. Besides, modular optical detection improves the reliability of the portable device, and a smartphone was used to achieve a portable and convenient nitrate analysis. Different water samples were successfully analysed using the portable device based on DMARs. The results demonstrated that the device features fast detection (115 s per sample), low reagent consumptions (26.8 μL per sample), particularly low consumptions of toxic reagents (0.38 μL per sample), good reproducibility and low relative standard deviations (RSDs, 0.5-1.38%). Predictably, the portable lab-on-chip device based on microstructured assisted reactors will find more applications in the field of water quality monitoring in the near future.
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Affiliation(s)
- Fang Wang
- Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics & technology, Wuhan University, Wuhan 430072, China.
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A Phosphorescence Quenching-Based Intelligent Dissolved Oxygen Sensor on an Optofluidic Platform. MICROMACHINES 2021; 12:mi12030281. [PMID: 33800237 PMCID: PMC7999388 DOI: 10.3390/mi12030281] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 02/26/2021] [Accepted: 03/05/2021] [Indexed: 12/21/2022]
Abstract
Continuous measurement of dissolved oxygen (DO) is essential for water quality monitoring and biomedical applications. Here, a phosphorescence quenching-based intelligent dissolved oxygen sensor on an optofluidic platform for continuous measurement of dissolved oxygen is presented. A high sensitivity dissolved oxygen-sensing membrane was prepared by coating the phosphorescence indicator of platinum(II) meso-tetrakis(pentafluorophenyl)porphyrin (PtTFPP) on the surface of the microfluidic channels composed of polydimethylsiloxane (PDMS) microstructure arrays. Then, oxygen could be determined by its quenching effect on the phosphorescence, according to Stern–Volmer model. The intelligent sensor abandons complicated optical or electrical design and uses a photomultiplier (PMT) counter in cooperation with a mobile phone application program to measure phosphorescence intensity, so as to realize continuous, intelligent and real-time dissolved oxygen analysis. Owing to the combination of the microfluidic-based highly sensitive oxygen sensing membrane with a reliable phosphorescent intensity detection module, the intelligent sensor achieves a low limit of detection (LOD) of 0.01 mg/L, a high sensitivity of 16.9 and a short response time (22 s). Different natural water samples were successfully analyzed using the intelligent sensor, and results demonstrated that the sensor features a high accuracy. The sensor combines the oxygen sensing mechanism with optofluidics and electronics, providing a miniaturized and intelligent detection platform for practical oxygen analysis in different application fields.
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Shi Y, Liang L, Zuo Y, Zhu X, Yang Y, Xin H, Li B. Amplitude Holographic Interference-Based Microfluidic Colorimetry at the Micrometer Scale. J Phys Chem Lett 2020; 11:4747-4754. [PMID: 32407119 DOI: 10.1021/acs.jpclett.0c01204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Quantitative molecular analysis is usually based on spectrophotometric methods using colorimetric assay. Conventional methods, however, rely on the direct uniform absorption of the sample under test, and the detection sensitivity is strictly limited by the length of the absorption cell at the millimeter scale. Here, we report a new methodology for colorimetric assay based on the amplitude holographic interference (AHI) caused by nonuniform absorption of light, with detection sensitivity at the micrometer scale. In our method, the curved surface of the microfluidics results in a phase profile with a high diffraction efficiency, and the nonuniform absorption of samples exactly matches with the amplitude modulation in the holographic interference. The signal intensity is affected by not only direct sample absorption but also the sequential optical interference behind the liquid level. Both single- and multiple-wavelength colorimetric analyses of the Griess-Saltzman dye (GSD) were carried out using this method, and we found that the sensitivity can be improved by approximately 2-fold in comparison to the conventional method. This interference-based method would be a useful tool for the colorimetric assay of chemical samples in highly integrated systems with better performance.
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Affiliation(s)
- Yang Shi
- Institute of Nanophotonics, Jinan University, Guangzhou 511443, China
| | - Li Liang
- School of Physics & Technology, Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, Wuhan University, Wuhan 430072, China
| | - Yunfeng Zuo
- School of Physics & Technology, Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, Wuhan University, Wuhan 430072, China
| | - Xiaoqiang Zhu
- Research Institute of Union Optech (Zhongshan) Co., Ltd., Zhongshan 528400, China
| | - Yi Yang
- School of Physics & Technology, Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, Wuhan University, Wuhan 430072, China
| | - Hongbao Xin
- Institute of Nanophotonics, Jinan University, Guangzhou 511443, China
| | - Baojun Li
- Institute of Nanophotonics, Jinan University, Guangzhou 511443, China
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16
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Hu X, Zhao S, Luo Z, Zuo Y, Wang F, Zhu J, Chen L, Yang D, Zheng Y, Zheng Y, Cheng Y, Zhou F, Yang Y. On-chip hydrogel arrays individually encapsulating acoustic formed multicellular aggregates for high throughput drug testing. LAB ON A CHIP 2020; 20:2228-2236. [PMID: 32441730 DOI: 10.1039/d0lc00255k] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Multicellular aggregates in three-dimensional (3D) environments provide novel solid tumor models that can provide insight into in vivo drug resistance. Such models are therefore essential for developing new drugs and preventing the failure of clinical treatments. However, high-throughput cell cluster assembly and fabricating individual 3D environments that mimic the extracellular matrix (ECM) remain significant challenges. To rapidly produce mini 3D multicellular aggregate units, acoustic force assembly combined with ECM mimic hydrogel array encapsulation is developed and then integrated into a diffusion-based microfluidic device for high-throughput drug testing. The active acoustic force gathers human mononuclear leukemia cells (THP-1) into hundreds of multicellular clusters with a controllable size. Instead of continuous bulk materials, photosensitive gelatin methacryloyl (GelMA) hydrogel pillar arrays containing cell clusters at drug concentration gradients are obtained through selective area exposure. Ten azelaic acid (AZA) concentration gradient series are applied to 100 units to simultaneously test the multicellular cluster drug resistance to multiple drug conditions. Real-time green fluorescent protein (GFP) fluorescence is analyzed to monitor cell viability. The results show that cell aggregate activity is inversely related to the drug concentration in the hydrogel pillars, and shows lower sensitivity to drug toxicity than the activity of monolayer cultured cells. The 3D multicellular arrays provide numerous in vitro tumor models and can be directly used for downstream drug testing. This technology inherits the advantages of acoustic assembly, while being more flexible, practical, and high-throughput, and shows significant potential for use in further tumor related research and clinical practice.
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Affiliation(s)
- Xuejia Hu
- School of Physics & Technology, Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, Wuhan University, Wuhan 430072, China. and Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Shukun Zhao
- School of Physics & Technology, Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, Wuhan University, Wuhan 430072, China. and Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Ziyi Luo
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, China
| | - Yunfeng Zuo
- School of Physics & Technology, Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, Wuhan University, Wuhan 430072, China. and Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Fang Wang
- School of Physics & Technology, Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, Wuhan University, Wuhan 430072, China. and Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Jiaomeng Zhu
- School of Physics & Technology, Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, Wuhan University, Wuhan 430072, China. and Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Longfei Chen
- School of Physics & Technology, Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, Wuhan University, Wuhan 430072, China. and Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Dongyong Yang
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan 430060, China
| | - Yajing Zheng
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan 430060, China
| | - Yujia Zheng
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, China
| | - Yanxiang Cheng
- Department of Obstetrics and Gynecology, Renmin Hospital of Wuhan University, Wuhan University, Wuhan 430060, China
| | - Fuling Zhou
- Department of Hematology, Zhongnan Hospital of Wuhan University, Wuhan University, Wuhan 430071, China
| | - Yi Yang
- School of Physics & Technology, Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, Wuhan University, Wuhan 430072, China. and Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
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17
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Zhu J, Han G, Hu X, Zuo Y, Chen L, Wang F, Yang Y, Jiang F, Sun C, Zhao W, Han X. A Portable and Accurate Phosphate Sensor Using a Gradient Fabry-Pérot Array. ACS Sens 2020; 5:1381-1388. [PMID: 32314571 DOI: 10.1021/acssensors.0c00090] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Here, a portable and accurate phosphate sensor using a gradient Fabry-Pérot array (FPA) is proposed. It can form a bidirectional gradient concentration (absorbance) distribution in the gradient FPA, simplifying the complex operations to get a standard curve and saving time. The gradient FPA can effectively filter out the interference (bubbles, light intensity, and salinity) while improving the absorbance, achieving a highly accurate and stable detection. Besides, the smartphone simplifies data processing and makes sensors more portable. In this work, the detection errors of standard solutions (100, 50, and 30 μM) are 0.39, 1.48, and 1.84%, respectively, and it has also been demonstrated with errors of 2.46 (sample 1, seawater), 2.08 (sample 2, lake water), and 1.83% (sample 3, sewage) for natural samples detection, which is more accurate than a traditional analyzer. The sensor has a good performance when affected by bubbles, light intensity, and salinity. In addition, the detection time is shortened to 80 s, which is more time saving compared with traditional devices, and the limit of detection (LOD) is 0.4 μM. It can be predicted that the novel optofluidic sensor is conducive to build a smart nutrient monitoring system and will be applied in the field of biochemistry and environmental chemistry.
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Affiliation(s)
- Jiaomeng Zhu
- Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Guangwen Han
- Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Xuejia Hu
- Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Yunfeng Zuo
- Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Longfei Chen
- Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Fang Wang
- Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China
| | - Yi Yang
- Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Fenghua Jiang
- The First Institute of Oceanography, SOA, Qingdao 266061, China
| | - Chengjun Sun
- The First Institute of Oceanography, SOA, Qingdao 266061, China
| | - Weihong Zhao
- Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
| | - Xiaotian Han
- Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
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18
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Wang F, Zhu J, Chen L, Zuo Y, Hu X, Yang Y. Autonomous and In Situ Ocean Environmental Monitoring on Optofluidic Platform. MICROMACHINES 2020; 11:E69. [PMID: 31936398 PMCID: PMC7019421 DOI: 10.3390/mi11010069] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 01/02/2020] [Accepted: 01/07/2020] [Indexed: 11/17/2022]
Abstract
Determining the distributions and variations of chemical elements in oceans has significant meanings for understanding the biogeochemical cycles, evaluating seawater pollution, and forecasting the occurrence of marine disasters. The primary chemical parameters of ocean monitoring include nutrients, pH, dissolved oxygen (DO), and heavy metals. At present, ocean monitoring mainly relies on laboratory analysis, which is hindered in applications due to its large size, high power consumption, and low representative and time-sensitive detection results. By integrating photonics and microfluidics into one chip, optofluidics brings new opportunities to develop portable microsystems for ocean monitoring. Optofluidic platforms have advantages in respect of size, cost, timeliness, and parallel processing of samples compared with traditional instruments. This review describes the applications of optofluidic platforms on autonomous and in situ ocean environmental monitoring, with an emphasis on their principles, sensing properties, advantages, and disadvantages. Predictably, autonomous and in situ systems based on optofluidic platforms will have important applications in ocean environmental monitoring.
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Affiliation(s)
- Fang Wang
- Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China; (F.W.); (J.Z.); (L.C.); (Y.Z.); (X.H.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Jiaomeng Zhu
- Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China; (F.W.); (J.Z.); (L.C.); (Y.Z.); (X.H.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Longfei Chen
- Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China; (F.W.); (J.Z.); (L.C.); (Y.Z.); (X.H.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Yunfeng Zuo
- Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China; (F.W.); (J.Z.); (L.C.); (Y.Z.); (X.H.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Xuejia Hu
- Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China; (F.W.); (J.Z.); (L.C.); (Y.Z.); (X.H.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
| | - Yi Yang
- Key Laboratory of Artificial Micro/Nano Structure of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China; (F.W.); (J.Z.); (L.C.); (Y.Z.); (X.H.)
- Shenzhen Research Institute, Wuhan University, Shenzhen 518000, China
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19
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Asiri AM, Adeosun WA, Marwani HM, Rahman MM. Homopolymerization of 3-aminobenzoic acid for enzyme-free electrocatalytic assay of nitrite ions. NEW J CHEM 2020. [DOI: 10.1039/c9nj06058h] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
We describe non-enzymatic novel detection of nitrite ions in various matrices on the surface of poly-3-aminobenzoic acid.
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Affiliation(s)
- Abdullah M. Asiri
- Department of Chemistry
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
| | - Waheed A. Adeosun
- Department of Chemistry
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
| | - Hadi M. Marwani
- Department of Chemistry
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
| | - Mohammed M. Rahman
- Department of Chemistry
- Faculty of Science
- King Abdulaziz University
- Jeddah 21589
- Saudi Arabia
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20
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Han S, Zhang Q, Zhang X, Liu X, Lu L, Wei J, Li Y, Wang Y, Zheng G. A digital microfluidic diluter-based microalgal motion biosensor for marine pollution monitoring. Biosens Bioelectron 2019; 143:111597. [DOI: 10.1016/j.bios.2019.111597] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 08/11/2019] [Accepted: 08/13/2019] [Indexed: 01/24/2023]
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21
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Pires NMM, Dong T, Yang Z. A fluorimetric nitrite biosensor with polythienothiophene-fullerene thin film detectors for on-site water monitoring. Analyst 2019; 144:4342-4350. [PMID: 31192320 DOI: 10.1039/c8an02441c] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A novel fluorimetric sensor for highly sensitive nitrite detection on the site is presented in this study. The proposed on-chip approach comprises the use of integrated polymer photodetectors to detect light from fluorescence reactions with a diaminofluorescein probe. The detectors were prepared with a heterostructured nanofilm of polythieno[3,4-b]thiophene/benzodithiophene and (6,6)-phenyl-C71-butyric-acid methyl-ester as a photoactive layer. Prior to fluorimetric detection, the quality of the spin-coated photoactive layer was characterized via nano-morphology and current-density measurements. Nitrite assays were conducted on a poly(methyl methacrylate) microchannel chip, to which polythienothiophene-C71 based detectors were aligned. Results of signal-to-noise ratio determination have indicated a detection limit below 0.55 μM, lower than the 0.1 mg L-1 maximum limit of operation in recirculating aquaculture systems for farming Atlantic salmon Salmo salar. An increase of the nitrite concentration to toxic levels may therefore be possible to detect. The fluorimetric sensor exhibited good linearity over three orders of magnitude and acceptable detection reproducibility, which confirmed its analytical value. Further tests revealed great promise of the integrated biosensor device for detecting nitrite in aquaculture-relevant samples with high precision. The approach reported hereby may provide impetus to in situ analytical tools for monitoring water quality at aquaculture facilities, the food industries or water monitoring stations.
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Affiliation(s)
- Nuno Miguel Matos Pires
- Chongqing Key Laboratory of Micro-Nano Systems and Smart Transduction, Collaborative Innovation Center on Micro-Nano Transduction and Intelligent Eco-Internet of Things, Chongqing Key Laboratory of Colleges and Universities on Micro-Nano Systems Technology and Smart Transducing, National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Nan'an District, Chongqing 400067, China and Department of Microsystems - IMS, Faculty of Technology, Natural Sciences and Maritime Sciences, University of South-Eastern Norway-USN, P.O. Box 235, 3603 Kongsberg, Norway. and Centre for Environmental Radioactivity (CERAD CoE), Norwegian University of Life Sciences (NMBU), Faculty of Environmental Sciences and Natural Resource Management, P.O. Box 5003, NO-1432 Ås, Norway
| | - Tao Dong
- Department of Microsystems - IMS, Faculty of Technology, Natural Sciences and Maritime Sciences, University of South-Eastern Norway-USN, P.O. Box 235, 3603 Kongsberg, Norway.
| | - Zhaochu Yang
- Chongqing Key Laboratory of Micro-Nano Systems and Smart Transduction, Collaborative Innovation Center on Micro-Nano Transduction and Intelligent Eco-Internet of Things, Chongqing Key Laboratory of Colleges and Universities on Micro-Nano Systems Technology and Smart Transducing, National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Nan'an District, Chongqing 400067, China
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22
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Chen Q, Li T, Li Z, Lu C, Zhang X. Dielectrophoresis-actuated liquid lenses with dual air/liquid interfaces tuned from biconcave to biconvex. LAB ON A CHIP 2018; 18:3849-3854. [PMID: 30420975 DOI: 10.1039/c8lc00999f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
This paper reports an electrically reconfigurable optofluidic lens with two air-liquid (silicone oil) interfaces actuated by dielectrophoretic (DEP) force. Initially, a symmetric biconcave air-liquid lens is formed by the surface tension in a microfluidic chip. Then, the DEP force deforms the air-liquid interfaces from biconcave to biconvex, tuning the focal length from -0.5 mm to infinite to +0.5 mm. The wide tunability of the focal length results from the large refractive index difference (∼0.4 at the air-liquid interface), which is only 0.1 in previous liquid-liquid lenses. In the experiment, the lens achieves an ƒ number of 0.91 while consuming only 6.7 nJ per circle. Some asymmetric working states, such as concave-convex and plano-convex lenses, have also been demonstrated. Compared with continuous liquid flow-sustained lenses, this stationary liquid lens holds promise of better compatibility and higher scalability. Its wide tunability, low power consumption and easy operation make it suitable for light manipulation in microfluidic networks.
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Affiliation(s)
- Qingming Chen
- Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong, China.
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