1
|
Wang J, Zhou H, Liang R, Qin W. Chronopotentiometric Nanopore Sensor Based on a Stimulus-Responsive Molecularly Imprinted Polymer for Label-Free Dual-Biomarker Detection. Anal Chem 2024; 96:9370-9378. [PMID: 38683892 DOI: 10.1021/acs.analchem.3c05817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
The development of sensors for detection of biomarkers exhibits an exciting potential in diagnosis of diseases. Herein, we propose a novel electrochemical sensing strategy for label-free dual-biomarker detection, which is based on the combination of stimulus-responsive molecularly imprinted polymer (MIP)-modified nanopores and a polymeric membrane chronopotentiometric sensor. The ion fluxes galvanostatically imposed on the sensing membrane surface can be blocked by the recognition reaction between the target biomarker in the sample solution and the stimulus-responsive MIP receptor in the nanopores, thus causing a potential change. By using two external stimuli (i.e., pH and temperature), the recognition abilities of the stimulus-responsive MIP receptor can be effectively modulated so that dual-biomarker label-free chronopotentiometric detection can be achieved. Using alpha fetoprotein (AFP) and prostate-specific antigen (PSA) as model biomarkers, the proposed sensor offers detection limits of 0.17 and 0.42 ng/mL for AFP and PSA, respectively.
Collapse
Affiliation(s)
- Junhao Wang
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS); Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Huihui Zhou
- The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, Shandong 264099, China
| | - Rongning Liang
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS); Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, China
| | - Wei Qin
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS); Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, China
- Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao, Shandong 266237, China
- Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, Shandong 266071, China
| |
Collapse
|
2
|
Zhao J, Ding J, Luan F, Qin W. Chronopotentiometric sensors for antimicrobial peptide-based biosensing of Staphylococcus aureus. Mikrochim Acta 2024; 191:356. [PMID: 38811412 DOI: 10.1007/s00604-024-06410-4] [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: 01/04/2024] [Accepted: 05/04/2024] [Indexed: 05/31/2024]
Abstract
Charged antimicrobial peptides can be used for direct potentiometric biosensing, but have never been explored. We report here a galvanostatically-controlled potentiometric sensor for antimicrobial peptide-based biosensing. Solid-state pulsed galvanostatic sensors that showed excellent stability under continuous galvanostatic polarization were prepared by utilizing reduced graphene oxide/poly (3,4-ethylenedioxythiophene): poly (4-styrenesulfonate) (rGO/PEDOT: PSS) as a solid contact. More importantly, the chronopotentiometric sensor can be made sensitive to antimicrobial peptides with intrinsic charge on demand via a current pulse. In this study, a positively charged antimicrobial peptide that can bind to Staphylococcus aureus with high affinity and good selectivity was designed as a model. Two arginine residues with positive charges were linked to the C-terminal of the peptide sequence to increase its potentiometric responses on the electrode. The bacteria binding-induced charge or charge density change of the antimicrobial peptide enables the direct chronopotentiometric detection of the target. Under the optimized conditions, the concentration of Staphylococcus aureus can be determined in the linear range 10-1.0 × 105 CFU mL-1 with a detection limit of 10 CFU mL-1. It is anticipated that such a chronopotentiometric sensing platform is readily adaptable to detect other bacteria by choosing the peptides.
Collapse
Affiliation(s)
- Jiarong Zhao
- College of Chemistry and Chemical Engineering, Yantai University, Yantai, 264003, People's Republic of China
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Shandong Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), YICCAS, Yantai, 264003, Shandong, People's Republic of China
| | - Jiawang Ding
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Shandong Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), YICCAS, Yantai, 264003, Shandong, People's Republic of China.
| | - Feng Luan
- College of Chemistry and Chemical Engineering, Yantai University, Yantai, 264003, People's Republic of China
| | - Wei Qin
- CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Shandong Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), YICCAS, Yantai, 264003, Shandong, People's Republic of China
- Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao, 266237, Shandong, People's Republic of China
- Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, Shandong, People's Republic of China
| |
Collapse
|
3
|
Wang M, Wu Y, Lou F, Cui W, Chen D, Zhang X, Jin D, Hun X. Photoelectrochemical signal for anion and cation detections with photoactive material. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-022-02591-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
|
4
|
Walker NL, Roshkolaeva AB, Chapoval AI, Dick JE. Recent Advances in Potentiometric Biosensing. CURRENT OPINION IN ELECTROCHEMISTRY 2021; 28:100735. [PMID: 34056144 PMCID: PMC8162913 DOI: 10.1016/j.coelec.2021.100735] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Potentiometric biosensors are incredibly versatile tools with budding uses in industry, security, environmental safety, and human health. This mini-review on recent (2018-2020) advances in the field of potentiometric biosensors is intended to give a general overview of the main types of potentiometric biosensors for novices while still providing a brief but thorough summary of the novel advances and trends for experienced practitioners. These trends include the incorporation of nanomaterials, graphene, and novel immobilization materials, as well as a strong push towards miniaturized, flexible, and self-powered devices for in-field or at-home use.
Collapse
Affiliation(s)
- Nicole L Walker
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| | | | - Andrei I Chapoval
- Russian-American Anti-Cancer Center, Altai State University, Barnaul, 656049, Russia
| | - Jeffrey E Dick
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
- Lineberger Comprehensive Cancer Center, School of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
| |
Collapse
|
5
|
Light-driven ion extraction of polymeric membranes for on-demand Cu(II) sensing. Anal Chim Acta 2021; 1176:338756. [PMID: 34399898 DOI: 10.1016/j.aca.2021.338756] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/26/2021] [Accepted: 06/11/2021] [Indexed: 11/21/2022]
Abstract
The modulation of the ion-fluxes across a polymeric membrane is important for designing attractive methodologies. As an alternative to the commonly used dynamic electrochemistry approaches, light can be used as an external stimulus and provides a very convenient way to manipulate ions release and/or extraction into a polymeric membrane. Herein, we designed a solid-contact polymeric membrane ion-selective sensor that exhibits dynamic response by light irradiation at 375 nm. The electrode membrane contains a light-sensitive lipophilic salt (bis(4-tert-butylphenyl)iodonium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (R+-R-, BTDT-TFPB) instead of traditional ion exchanger. Under light illumination, the decomposition of the lipophilic cation makes the membrane with ion-exchange properties. The solid-contact ion-selective electrodes based on potentiometry and constant potential coulometry have been explored for direct ion sensing. Copper was selected as a mode analyte and can be determined at micromole levels. The proposed dynamic ion sensors show promise for on-demand ion sensing.
Collapse
|
6
|
Ahmadi M, Ghoorchian A, Dashtian K, Kamalabadi M, Madrakian T, Afkhami A. Application of magnetic nanomaterials in electroanalytical methods: A review. Talanta 2020; 225:121974. [PMID: 33592722 DOI: 10.1016/j.talanta.2020.121974] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 11/07/2020] [Accepted: 12/03/2020] [Indexed: 02/08/2023]
Abstract
Magnetic nanomaterials (MNMs) have gained high attention in different fields of studies due to their ferromagnetic/superparamagnetic properties and their low toxicity and high biocompatibility. MNMs contain magnetic elements such as iron and nickel in metallic, bimetallic, metal oxide, and mixed metal oxide. In electroanalytical methods, MNMs have been applied as sorbents for sample preparation before the electrochemical detection (sorbent role), as the electrode modifier (catalytic role), and the integration of the above two roles (as both sorbent and catalytic agent). In this paper, the application of MNMs in electroanalytical methods have been classified based on the main role of the nanomaterial and discussed separately. Furthermore, catalytic activities of MNMs in electroanalytical methods such as redox electrocatalytic, nanozymes catalytic (peroxidase, catalase activity, oxidase activity, superoxide dismutase activity), catalyst gate, and nanocontainer have been discussed.
Collapse
Affiliation(s)
- Mazaher Ahmadi
- Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran.
| | | | | | | | | | - Abbas Afkhami
- Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran.
| |
Collapse
|
7
|
Frantz E, Li H, Steckl AJ. Quantitative hematocrit measurement of whole blood in a point-of-care lateral flow device using a smartphone flow tracking app. Biosens Bioelectron 2020; 163:112300. [PMID: 32568698 DOI: 10.1016/j.bios.2020.112300] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 04/19/2020] [Accepted: 05/12/2020] [Indexed: 10/24/2022]
Abstract
We present a rapid and quantitative point-of-care (PoC) system based on a smartphone application that is capable of accurately tracking the flow of red blood cells (RBCs) through a no-reaction lateral flow assay (nrLFA) device. Utilizing only the camera feed from the smartphone and built-in image processing, the nrLFA is identified and RBC fluid flow distances and rates are recorded in parallel with the test without the need of any custom hardware or enclosure. We demonstrated the application by first measuring and then calculating hematocrit (Hct) values of whole blood samples with nominal content of 28%, 35%, 40%, and 45% Hct on the nrLFA platform. The PoC system was able to accurately measure (to within 1% Hct of nominal values) whole blood Hct in ~10-20 s after sample dispensing.
Collapse
Affiliation(s)
- Eric Frantz
- Nanoelectronics Laboratory, Department of Electrical Engineering and Computer Science, University of Cincinnati, Cincinnati, OH, 45221-0030, USA
| | - Hua Li
- Nanoelectronics Laboratory, Department of Electrical Engineering and Computer Science, University of Cincinnati, Cincinnati, OH, 45221-0030, USA
| | - Andrew J Steckl
- Nanoelectronics Laboratory, Department of Electrical Engineering and Computer Science, University of Cincinnati, Cincinnati, OH, 45221-0030, USA.
| |
Collapse
|
8
|
Han T, Mousavi Z, Mattinen U, Bobacka J. Coulometric response characteristics of solid contact ion-selective electrodes for divalent cations. J Solid State Electrochem 2020. [DOI: 10.1007/s10008-020-04718-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AbstractThe chronoamperometric and coulometric response of solid contact ion-selective electrodes (SCISEs) for the detection of divalent cations was investigated in order to provide a more complete description of the mechanism of the recently introduced coulometric transduction method for SCISEs. The coulometric transduction method has earlier been employed only for SCISEs that were selective to monovalent ions. The SCISEs utilized poly(3,4-ethylenedioxythiophene) (PEDOT) doped with poly(styrene sulfonate) (PSS−) as the solid contact (ion-to-electron transducer). PEDOT(PSS) was electrodeposited on glassy carbon and covered with plasticized PVC-based ion-selective membranes (ISMs) that were selective towards divalent cations (Ca2+, Pb2+). In contrast to earlier studies, the results obtained in this work show that the coulometric response for the Pb2+-SCISE was limited mainly by ion transport in the PEDOT(PSS) layer, which was not the case for the Ca2+-SCISE, nor was it observed earlier for the monovalent ions. The exceptional behavior of the Pb2+-SCISE was explored further by electrochemical impedance spectroscopy, and it was shown that the effective redox capacitance of PEDOT(PSS) was significantly higher for the Pb2+-SCISE than for the Ca2+-SCISE although the polymerization charge of PEDOT(PSS) was the same. The slow transport of Pb2+ in PEDOT(PSS) was tentatively related to complexation between Pb2+ and PEDOT(PSS).
Collapse
|
9
|
|
10
|
Stable Pb2+ ion-selective electrodes based on polyaniline-TiO2 solid contacts. Anal Chim Acta 2020; 1094:26-33. [DOI: 10.1016/j.aca.2019.10.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 09/14/2019] [Accepted: 10/06/2019] [Indexed: 12/20/2022]
|
11
|
Liu S, Ding J, Qin W. Dual-Analyte Chronopotentiometric Aptasensing Platform Based on a G-Quadruplex/Hemin DNAzyme and Logic Gate Operations. Anal Chem 2019; 91:3170-3176. [PMID: 30648390 DOI: 10.1021/acs.analchem.8b05971] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Conventional potentiometric ion sensors that rely on a specific ion carrier in a polymeric membrane can hardly achieve multianalyte detection. Inspired by the remarkable ability of built-in logic gate sensors for multianalyte detection, herein we report a potentiometric aptasensing platform based on a G-quadruplex/hemin DNAzyme and logic gate operations for determination of two analytes using a single membrane electrode. A bifunctional probe with two aptamer units and a signal reporter oligonucleotide with a DNAzyme sequence are assembled on the magnetic beads to form a DNA hybrid structure. The "OR" and "INHIBIT" logic functions can be performed by using the two aptamers and their targets as inputs, and using the chronopotentiometric response based on the G-quadruplex/hemin DNAzyme-H2O2-mediated oxidation of 3,3',5,5'-tetramethylbenzidine as output. Kanamycin and oxytetracycline, as commonly used antibiotics, have been employed as the models and successfully measured.
Collapse
Affiliation(s)
- Shuwen Liu
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation and Shandong Provincial Key Laboratory of Coastal Environmental Processes , Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS) , Yantai , Shandong 264003 , P. R. China.,University of the Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Jiawang Ding
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation and Shandong Provincial Key Laboratory of Coastal Environmental Processes , Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS) , Yantai , Shandong 264003 , P. R. China.,Laboratory for Marine Biology and Biotechnology , Qingdao National Laboratory for Marine Science and Technology , Qingdao 266200 , P. R. China
| | - Wei Qin
- Key Laboratory of Coastal Environmental Processes and Ecological Remediation and Shandong Provincial Key Laboratory of Coastal Environmental Processes , Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS) , Yantai , Shandong 264003 , P. R. China.,Laboratory for Marine Biology and Biotechnology , Qingdao National Laboratory for Marine Science and Technology , Qingdao 266200 , P. R. China
| |
Collapse
|
12
|
Liu W, Huang J, Zhu Y, Zhang H, Ning N, Song C. Potentiometric Characterization of Telomerase Activity Using a Copper(ii)-pyrophosphate Complex with a Copper ion-selective Electrode. ANAL LETT 2019. [DOI: 10.1080/00032719.2018.1463537] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Wen Liu
- The Pharmaceutical Department of the Hunan Provincial People’s Hospital Affiliated to Hunan Normal University, Changsha, China
| | - Jiahua Huang
- School of Pharmacy of the Hunan University of Chinese Medicine, Changsha, China
| | - Yiming Zhu
- The Hunan Provincial People’s Hospital Affiliated to Hunan Normal University, Changsha, China
| | - Huan Zhang
- The Hunan Provincial People’s Hospital Affiliated to Hunan Normal University, Changsha, China
| | - Ning Ning
- The Hunan Provincial People’s Hospital Affiliated to Hunan Normal University, Changsha, China
| | - Caiting Song
- The Hunan Provincial People’s Hospital Affiliated to Hunan Normal University, Changsha, China
| |
Collapse
|
13
|
Huang S, Gan N, Zhang X, Wu Y, Shao Y, Jiang Z, Wang Q. Portable fluoride-selective electrode as signal transducer for sensitive and selective detection of trace antibiotics in complex samples. Biosens Bioelectron 2018; 128:113-121. [PMID: 30641453 DOI: 10.1016/j.bios.2018.12.042] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 12/14/2018] [Accepted: 12/21/2018] [Indexed: 11/16/2022]
Abstract
Ion-selective electrodes (ISE) can rapidly, sensitively detect their corresponding ions and are suitable for field testing. However, most ISE methods cannot detect other targets directly which limits their practice application. Herein, we established an aptamer-sensing platform to detect organic small molecule using a portable fluoride-selective electrode (FSE). To achieve the purpose, novel signal tags were fabricated based on nano metal-organic frameworks (NMOF) encapsulating F- and labeling aptamers. They were then immobilized on one stir-bar. Subsequently, a double stir-bars (bar-a and b) assisted target recycling strategy was designed to convert organic small molecular target to F- for signal development and amplification. The movement of tags from bar-a to b can be triggered by the analytes. After reaction, the transferred signal tags in bar-b were washed and released F- which can be measured by FSE for qualification of the target. The assay was evaluated to detect kanamycin or chloramphenicol which was employed as the representatives of organic small molecular with a low detection limit of 0.35 nmol L-1 or 0.46 nmol L-1, respectively. Satisfactory performance was observed in complex sample analysis of kanamycin (milk, fish, urine and serum) with a recovery of 91-108% and an RSD (n = 6) <5%. The proposed method broadens the application of traditional FSE to the detection of organic small molecule. And the employment of NMOF which has higher encapsulating capacity of F- for preparing signal tags can be extended to FSE based aptasensors.
Collapse
Affiliation(s)
- Shengfeng Huang
- State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China; Institute of Pharmaceutical Analysis, College of Pharmacy, Jinan University, Guangzhou 510632, China
| | - Ning Gan
- State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China.
| | - Xinyu Zhang
- State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Yongxiang Wu
- State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211, China
| | - Yong Shao
- College of chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321000, China
| | - Zhengjin Jiang
- Institute of Pharmaceutical Analysis, College of Pharmacy, Jinan University, Guangzhou 510632, China
| | - Qiqin Wang
- Institute of Pharmaceutical Analysis, College of Pharmacy, Jinan University, Guangzhou 510632, China.
| |
Collapse
|
14
|
Exploring Protein-Inorganic Hybrid Nanoflowers and Immune Magnetic Nanobeads to Detect Salmonella Typhimurium. NANOMATERIALS 2018; 8:nano8121006. [PMID: 30518091 PMCID: PMC6316584 DOI: 10.3390/nano8121006] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 11/28/2018] [Accepted: 11/30/2018] [Indexed: 01/17/2023]
Abstract
Early screening of pathogenic bacteria is key to preventing and controlling outbreaks of foodborne diseases. In this study, protein-inorganic hybrid nanoflowers were synthesized for signal amplification and used with a calcium ion selective electrode (Ca-ISE) to establish a new enzyme-free assay for rapid and sensitive detection of Salmonella. Calcium hydrophosphate crystals were first conjugated with polyclonal antibodies against Salmonella to synthesize immune calcium nanoflowers (CaNFs), and streptavidin modified magnetic nanobeads (MNBs) were conjugated with biotinylated monoclonal antibodies against Salmonella to form immune MNBs. After target bacteria were separated using immune MNBs to form magnetic bacteria, immune CaNFs were conjugated with magnetic bacteria to form nanoflower conjugated bacteria. Then, hydrogen chloride was used to release calcium ions from nanoflower conjugated bacteria. After magnetic separation, the supernatant was finally injected as a continuous-flow to fluidic chip with Ca-ISE for specific detection of calcium ions. The supernatant's potential had a good linear relationship with bacteria concentration, and this assay was able to detect the S. Typhimurium cells as low as 28 colony forming units/mL within two hours. The mean recovery of target bacteria in spiked chicken samples was 95.0%. This proposed assay shows the potential for rapid, sensitive, and on-line detection of foodborne pathogens.
Collapse
|
15
|
Liu S, Ding J, Qin W. Current pulse based ion-selective electrodes for chronopotentiometric determination of calcium in seawater. Anal Chim Acta 2018; 1031:67-74. [DOI: 10.1016/j.aca.2018.06.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 06/04/2018] [Accepted: 06/07/2018] [Indexed: 10/14/2022]
|
16
|
Affiliation(s)
- Elena Zdrachek
- 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
| |
Collapse
|
17
|
Zhai J, Yang L, Du X, Xie X. Electrochemical-to-Optical Signal Transduction for Ion-Selective Electrodes with Light-Emitting Diodes. Anal Chem 2018; 90:12791-12795. [DOI: 10.1021/acs.analchem.8b03213] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Jingying Zhai
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Liyuan Yang
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Xinfeng Du
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Xiaojiang Xie
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| |
Collapse
|