1
|
Zhang G, Zhao W, Liu W, Zhou J, Wu Z. A Cytidine-Modified surfactant anchored liquid crystal Droplet-Based sensor for rapid and accurate detection of silver ions. J Colloid Interface Sci 2023; 650:58-66. [PMID: 37392500 DOI: 10.1016/j.jcis.2023.06.111] [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: 04/05/2023] [Revised: 06/12/2023] [Accepted: 06/16/2023] [Indexed: 07/03/2023]
Abstract
Liquid crystal (LC) droplets exhibit unique and sensitive response behaviors to surface absorptions, making them promising candidates for sensing aplications. Here, we have developed a label-free, portable, and cost-effective sensor for the specific and rapid detection of silver ions (Ag+) in drinking-water samples. To achieve this, we have modified cytidine into a surfactant (denoted as C10-M-C) and anchored it onto the surface of LC droplets. The specific binding ability between cytidine and Ag+ enables LC droplets anchored with C10-M-C to respond rapidly and specifically to Ag+ ions. Furthermore, the sensitivity of the response meets requirements for the harmless concentration of Ag+ in drinking-water. The sensor we developed is label-free, portable, and cost-effectively. We believe that the sensor reported here can be applied to the detection of Ag+ in drinking-water and environmental samples.
Collapse
Affiliation(s)
- Guannan Zhang
- State Key Laboratory of Chemo/Bio-sensing and Chemo-metrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Wenting Zhao
- State Key Laboratory of Chemo/Bio-sensing and Chemo-metrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Wenzhao Liu
- State Key Laboratory of Chemo/Bio-sensing and Chemo-metrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Jun Zhou
- State Key Laboratory of Chemo/Bio-sensing and Chemo-metrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Zhaoyang Wu
- State Key Laboratory of Chemo/Bio-sensing and Chemo-metrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China.
| |
Collapse
|
2
|
Liang QY, Wang C, Li HW, Wu Y. A ratiometric luminescence probe for selective detection of Ag + based on thiolactic acid-capped gold nanoclusters with near-infrared emission and employing bovine serum albumin as a signal amplifier. Mikrochim Acta 2023; 190:374. [PMID: 37653352 DOI: 10.1007/s00604-023-05955-0] [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: 05/09/2023] [Accepted: 08/13/2023] [Indexed: 09/02/2023]
Abstract
When thiolactic acid-capped gold nanoclusters (AuNCs@TLA) with strong near-infrared (NIR, 800 nm) emission were applied to detect metal ions, only Ag+ induced the generation of two new emission peaks at 610 and 670 nm in sequence and quenching the original NIR emission. The new peak at 670 nm generated after the 800-nm emission disappeared utterly. The ratiometric and turn-on responses showed different linear concentration ranges (0.10-4.0 μmol·L-1 and 10-50 μmol·L-1) toward Ag+, and the limit of detection (LOD) was 40 nmol·L-1. Especially, the probe exhibited extremely high selectivity and strong anti-interference from other metal ions. Mechanism studies showed that the novel responses were attributed to the anti-galvanic reaction of AuNCs to Ag+ and formation of bimetallic nanoclusters. The two new emission peaks were due to the composition change and size growth of the metal core. Besides, bovine serum albumin (BSA) has been employed as a signal amplifier based on the assembly-induced emission enhancement properties of AuNCs, which improved the LOD to 10 nmol·L-1. Moreover, the ratiometric method is feasible for Ag+ detection in diluted serum with high recovery rates, showing large application potential in the biological system. The present study supplies a novel ratiometric probe for Ag+ with a two-stage response and provides a novel signal amplifier of BSA, which will facilitate and promote the application of NIR-emitted metal nanoclusters in biological system.
Collapse
Affiliation(s)
- Qi-Yu Liang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, No. 2699 Qianjin Street, Changchun, 130012, People's Republic of China
- Institute of Theoretical Chemistry, College of Chemistry, Jilin University, No. 2 Liutiao Road, Changchun, 130023, People's Republic of China
| | - Chong Wang
- Department of Hepatic-Biliary-Pancreatic Medicine, First Hospital, Jilin University, No. 71 Xinmin Street, Changchun, 130021, People's Republic of China
| | - Hong-Wei Li
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, No. 2699 Qianjin Street, Changchun, 130012, People's Republic of China.
- Institute of Theoretical Chemistry, College of Chemistry, Jilin University, No. 2 Liutiao Road, Changchun, 130023, People's Republic of China.
| | - Yuqing Wu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, No. 2699 Qianjin Street, Changchun, 130012, People's Republic of China.
- Institute of Theoretical Chemistry, College of Chemistry, Jilin University, No. 2 Liutiao Road, Changchun, 130023, People's Republic of China.
| |
Collapse
|
3
|
Riccardi M, Martin OJF. Electromagnetic Forces and Torques: From Dielectrophoresis to Optical Tweezers. Chem Rev 2023; 123:1680-1711. [PMID: 36719985 PMCID: PMC9951227 DOI: 10.1021/acs.chemrev.2c00576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Indexed: 02/02/2023]
Abstract
Electromagnetic forces and torques enable many key technologies, including optical tweezers or dielectrophoresis. Interestingly, both techniques rely on the same physical process: the interaction of an oscillating electric field with a particle of matter. This work provides a unified framework to understand this interaction both when considering fields oscillating at low frequencies─dielectrophoresis─and high frequencies─optical tweezers. We draw useful parallels between these two techniques, discuss the different and often unstated assumptions they are based upon, and illustrate key applications in the fields of physical and analytical chemistry, biosensing, and colloidal science.
Collapse
Affiliation(s)
- Marco Riccardi
- Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology Lausanne (EPFL), EPFL-STI-NAM, Station 11, CH-1015Lausanne, Switzerland
| | - Olivier J. F. Martin
- Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology Lausanne (EPFL), EPFL-STI-NAM, Station 11, CH-1015Lausanne, Switzerland
| |
Collapse
|
4
|
Fan X, Lv J, Li R, Chen Y, Zhang S, Liu T, Zhou S, Shao X, Wang S, Hu G, Yue Q. Paper test strip for silver ions detection in drinking water samples based on combined fluorometric and colorimetric methods. ARAB J CHEM 2022. [DOI: 10.1016/j.arabjc.2022.104492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
|
5
|
Yeo KI, Park I, Lee SH, Lee SY, Chang WJ, Bashir R, Choi S, Lee SW. Ultra-sensitive dielectrophoretic surface charge multiplex detection inside a micro-dielectrophoretic device. Biosens Bioelectron 2022; 210:114235. [PMID: 35483112 DOI: 10.1016/j.bios.2022.114235] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 03/22/2022] [Accepted: 03/28/2022] [Indexed: 12/23/2022]
Abstract
Label-free dielectrophoretic force-based surface charge detection has shown great potential for highly sensitive and selective sensing of metal ions and small biomolecules. However, this method suffers from a complex calibration process and measurement signal interference in simultaneous multi-analyte detection, thus creating difficulties in multiplex detection. We have developed a method to overcome these issues based on the optical discrimination of the dielectrophoretic behaviors of multiple microparticle probes considering the surface charge difference before and after self-assembling conjugation. In this report, we demonstrate and characterize this dielectrophoretic force-based surface charge detection method with particle probes functionalized by various biomolecules. This technique achieved an attomolar limit of detection (LOD) for Hg2+ in distilled water and a femtomolar LOD in drinking water using DNA aptamer-functionalized particle probes. More importantly, using two different DNA aptamer-functionalized particle probes for Hg2+ and Ag+, label-free dielectrophoretic multiplex detection of these species in drinking water with a femtomolar and a nanomolar LOD was achieved for the first time.
Collapse
Affiliation(s)
- Kang In Yeo
- Department of Biomedical Engineering, Yonsei University, Wonju, 26493, Republic of Korea
| | - Insu Park
- Holonyak Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Sang Hyun Lee
- Department of Biomedical Engineering, Yonsei University, Wonju, 26493, Republic of Korea
| | - Sei Young Lee
- Department of Biomedical Engineering, Yonsei University, Wonju, 26493, Republic of Korea
| | - Woo-Jin Chang
- Mechanical Engineering Department, University of Wisconsin-Milwaukee, Milwaukee, WI, 53211, USA
| | - Rashid Bashir
- Holonyak Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA; Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA; Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA; Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Seungyeop Choi
- Department of Biomedical Engineering, Yonsei University, Wonju, 26493, Republic of Korea.
| | - Sang Woo Lee
- Department of Biomedical Engineering, Yonsei University, Wonju, 26493, Republic of Korea.
| |
Collapse
|
6
|
Zheng W, Li Y, Zhao L, Li C, Wang L. Label-free fluorescent aptasensor for chloramphenicol based on hybridization chain reaction amplification and G-quadruplex/ N-methyl mesoporphyrin IX complexation. RSC Adv 2022; 12:18347-18353. [PMID: 35799942 PMCID: PMC9215126 DOI: 10.1039/d2ra00572g] [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: 01/27/2022] [Accepted: 06/13/2022] [Indexed: 11/29/2022] Open
Abstract
The use of the broad-spectrum antibiotic chloramphenicol (CAP) in food is strictly regulated or banned in many countries. Herein, for the sensitive, rapid, and specific detection of CAP in milk, a label-free fluorescence strategy was established based on guanine (G)-quadruplex/N-methyl mesoporphyrin IX (NMM) complex formation and hybridization chain reaction (HCR) amplification. In this system, CAP can specifically bind to an aptamer (Apt) to release an Apt-C sequence from double-stranded DNA (Apt·Apt-C). Apt-C, can further hybridize with a functional hairpin DNA probe to release a primer sequence. The released primer sequence causes HCR and the formation of a nicked double-helix polymer, which contains G-quadruplex DNA. The recognition of G-quadruplex DNA by the NMM fluorochrome results in fluorescence enhancement. Consequently, CAP can be quantitatively detected by measuring the fluorescence intensity at 612 nm. The reliability of the aptasensor method was confirmed by comparison with an enzyme-linked immunosorbent assay. The proposed aptasensor was found to have a limit of detection of 0.8 pg mL−1 for CAP. Moreover, when the aptasensor was applied to the detection of CAP in milk samples, the average recoveries were 99.8–108.3% with relative standard deviations of 4.5–5.2%. Thus, this CAP detection method, which is rapid with high sensitivity and selectivity, has considerable potential for a wide range of food analysis applications. For the sensitive and specific detection of CAP in milk, a label-free fluorescence strategy was established based on guanine (G)-quadruplex/N-methyl mesoporphyrin IX (NMM) complex formation and hybridization chain reaction (HCR) amplification.![]()
Collapse
Affiliation(s)
- Wentao Zheng
- Zhanjiang Central Hospital, Guangdong Medical University, Zhanjiang, 524045, China
| | - Yubin Li
- Faculty of Chemistry & Environmental Science, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Liting Zhao
- Faculty of Chemistry & Environmental Science, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Ciling Li
- Faculty of Chemistry & Environmental Science, Guangdong Ocean University, Zhanjiang, 524088, China
| | - Lei Wang
- Zhanjiang Central Hospital, Guangdong Medical University, Zhanjiang, 524045, China
| |
Collapse
|
7
|
Yang C, Huang X, Li X, Yang C, Zhang T, Wu Q, liu D, Lin H, Chen W, Hu N, Xie X. Wearable and Implantable Intraocular Pressure Biosensors: Recent Progress and Future Prospects. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2002971. [PMID: 33747725 PMCID: PMC7967055 DOI: 10.1002/advs.202002971] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 10/24/2020] [Indexed: 05/09/2023]
Abstract
Biosensors worn on or implanted in eyes have been garnering substantial attention since being proven to be an effective means to acquire critical biomarkers for monitoring the states of ophthalmic disease, diabetes. Among these disorders, glaucoma, the second leading cause of blindness globally, usually results in irreversible blindness. Continuous intraocular pressure (IOP) monitoring is considered as an effective measure, which provides a comprehensive view of IOP changes that is beyond reach for the "snapshots" measurements by clinical tonometry. However, to satisfy the applications in ophthalmology, the development of IOP sensors are required to be prepared with biocompatible, miniature, transparent, wireless and battery-free features, which are still challenging with many current fabrication processes. In this work, the recent advances in this field are reviewed by categorizing these devices into wearable and implantable IOP sensors. The materials and structures exploited for engineering these IOP devices are presented. Additionally, their working principle, performance, and the potential risk that materials and device architectures may pose to ocular tissue are discussed. This review should be valuable for preferable structure design, device fabrication, performance optimization, and reducing potential risk of these devices. It is significant for the development of future practical IOP sensors.
Collapse
Affiliation(s)
- Cheng Yang
- State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologyThe First Affiliated Hospital of Sun Yat‐Sen UniversitySun Yat‐Sen UniversityGuangzhou510006China
| | - Xinshuo Huang
- State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologyThe First Affiliated Hospital of Sun Yat‐Sen UniversitySun Yat‐Sen UniversityGuangzhou510006China
| | - Xiangling Li
- State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologyThe First Affiliated Hospital of Sun Yat‐Sen UniversitySun Yat‐Sen UniversityGuangzhou510006China
- School of Biomedical EngineeringSun Yat‐Sen UniversityGuangzhou510006China
| | - Chengduan Yang
- State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologyThe First Affiliated Hospital of Sun Yat‐Sen UniversitySun Yat‐Sen UniversityGuangzhou510006China
| | - Tao Zhang
- State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologyThe First Affiliated Hospital of Sun Yat‐Sen UniversitySun Yat‐Sen UniversityGuangzhou510006China
- School of Biomedical EngineeringSun Yat‐Sen UniversityGuangzhou510006China
| | - Qianni Wu
- State Key Laboratory of OphthalmologyZhongshan Ophthalmic CenterSun Yat‐Sen UniversityGuangzhou510060China
| | - Dong liu
- State Key Laboratory of OphthalmologyZhongshan Ophthalmic CenterSun Yat‐Sen UniversityGuangzhou510060China
| | - Haotian Lin
- State Key Laboratory of OphthalmologyZhongshan Ophthalmic CenterSun Yat‐Sen UniversityGuangzhou510060China
| | - Weirong Chen
- State Key Laboratory of OphthalmologyZhongshan Ophthalmic CenterSun Yat‐Sen UniversityGuangzhou510060China
| | - Ning Hu
- State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologyThe First Affiliated Hospital of Sun Yat‐Sen UniversitySun Yat‐Sen UniversityGuangzhou510006China
| | - Xi Xie
- State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Province Key Laboratory of Display Material and TechnologySchool of Electronics and Information TechnologyThe First Affiliated Hospital of Sun Yat‐Sen UniversitySun Yat‐Sen UniversityGuangzhou510006China
- State Key Laboratory of OphthalmologyZhongshan Ophthalmic CenterSun Yat‐Sen UniversityGuangzhou510060China
| |
Collapse
|
8
|
Wang L, Guo W, Zhu H, He H, Wang S. Preparation and properties of a dual-function cellulose nanofiber-based bionic biosensor for detecting silver ions and acetylcholinesterase. JOURNAL OF HAZARDOUS MATERIALS 2021; 403:123921. [PMID: 33264972 DOI: 10.1016/j.jhazmat.2020.123921] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 08/27/2020] [Accepted: 09/08/2020] [Indexed: 06/12/2023]
Abstract
A dual-function cellulose nanofiber (CNF)-based bionic biosensor with good biocompatibility was developed for detecting Ag+ and acetylcholinesterase (AChE) by grafting deoxyribonucleic acid (DNA) onto CNF. The Ag+ ions captured by the biosensor acted as recognition sites for the detection of AChE. The CNF-based bionic biosensor (CNF-DNA) could detect Ag+ concentrations as low as 10-6 nM in the presence of interference metal ions (Hg2+, Ba2+, Cd2+, Mg2+, Mn2+, Pb2+, and Zn2+). DNA-template silver nanoclusters (DNA-AgNCs) were formed on the surface of CNF-DNA during the detection of Ag+ (CNF-DNA-AgNCs). This new strategy yielded CNF-DNA-AgNCs through the adsorption of Ag+ ions onto the cytosine base of the single-stranded DNA in CNF-DNA without the use of any additional reducer. Meanwhile, the CNF-DNA-AgNCs exhibited excellent sensitivity and selectivity for trace levels (0.053 mU/mL) of AChE in the presence of interference reagents. The novel strategy proposed in this paper may establish a foundation for further research on DNA-template AgNCs for developing biosensors and biomarkers for in vivo and in vitro detection.
Collapse
Affiliation(s)
- Lei Wang
- College of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, PR China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning, 530004, PR China
| | - Wei Guo
- College of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, PR China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning, 530004, PR China
| | - Hongxiang Zhu
- College of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, PR China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning, 530004, PR China
| | - Hui He
- College of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, PR China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning, 530004, PR China.
| | - Shuangfei Wang
- College of Light Industry and Food Engineering, Guangxi University, Nanning, 530004, PR China; Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning, 530004, PR China
| |
Collapse
|
9
|
Baliyan VK, Lee B, Song JK. Quantum Dot Arrays Fabricated Using In Situ Photopolymerization of a Reactive Mesogen and Dielectrophoresis. ACS APPLIED MATERIALS & INTERFACES 2020; 12:40655-40661. [PMID: 32786215 DOI: 10.1021/acsami.0c10915] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Dielectrophoresis (DEP) is an excellent tool for manipulating small particles within a liquid or gas medium. However, when the size of the particles is too small, such as with quantum dots (QDs), it is difficult to manipulate the particles using DEP because the dielectrophoretic force (FDEP) depends on the volume of the particles and is therefore too weak to achieve particle migration. Herein, we demonstrate a novel method for controlling nanoscale QD particles using DEP by introducing photopolymerized reactive mesogen (RM) bead vehicles. The size of an RM bead is well-controlled by the RM concentration in the medium, and when the size is approximately 0.2 μm or larger, the RM beads can be arbitrarily manipulated using DEP under moderate electric fields. Interestingly, during photopolymerization, QD particles are easily absorbed by polymerized RM beads and most of the QDs are embedded within the RM beads. Hence, we can fabricate periodic QD arrays by manipulating the RM beads containing such dots. In addition, we can fabricate multicolor QD arrays by repeating the processes using different QD particles. The shape of a DEP-assisted QD-RM network pattern can be precisely predicted by calculating the gradient of the square of the electric field (∇E2) and the corresponding FDEP. This new technology may be useful for the fabrication of optical devices, displays, photonic crystal devices, and bioapplications.
Collapse
Affiliation(s)
- Vijay Kumar Baliyan
- Department of Electrical & Computer Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Bomi Lee
- Department of Electrical & Computer Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Jang-Kun Song
- Department of Electrical & Computer Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
| |
Collapse
|
10
|
Park I, Lim JW, Kim SH, Choi S, Ko KH, Son MG, Chang WJ, Yoon YR, Yang S, Key J, Kim YS, Eom K, Bashir R, Lee SY, Lee SW. Variable Membrane Dielectric Polarization Characteristic in Individual Live Cells. J Phys Chem Lett 2020; 11:7197-7203. [PMID: 32813536 DOI: 10.1021/acs.jpclett.0c01427] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Investigation of the dielectric properties of cell membranes plays an important role in understanding the biological activities that sustain cellular life and realize cellular functionalities. Herein, the variable dielectric polarization characteristics of cell membranes are reported. In controlling the dielectric polarization of a cell using dielectrophoresis force spectroscopy, different cellular crossover frequencies were observed by modulating both the direction and sweep rate of the frequency. The crossover frequencies were used for the extraction of the variable capacitance, which is involved in the dielectric polarization across the cell membranes. In addition, this variable phenomenon was investigated by examining cells whose membranes were cholesterol-depleted with methyl-β-cyclodextrin, which verified a strong correlation between the variable dielectric polarization characteristics and membrane composition changes. This study presented the dielectric polarization properties in live cells' membranes that can be modified by the regulation of external stimuli and provided a powerful platform to explore cellular membrane dielectric polarization.
Collapse
Affiliation(s)
- Insu Park
- Holonyak Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Jong Won Lim
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea
| | - Sung Hoon Kim
- Department of Biomedical Laboratory Science, Yonsei University, Wonju 26493, Korea
- Department of Biomedical Laboratory Science, Korea Nazarene University, Chungnam 31172, Korea
| | - Seungyeop Choi
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea
| | - Kwan Hwi Ko
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea
| | - Myung Gu Son
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea
| | - Woo-Jin Chang
- Mechanical Engineering Department, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, United States
| | - Young Ro Yoon
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea
| | - Sejung Yang
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea
| | - Jaehong Key
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea
| | - Yoon Suk Kim
- Department of Biomedical Laboratory Science, Yonsei University, Wonju 26493, Korea
| | - Kilho Eom
- Biomechanics Laboratory, College of Sport Science, Sungkyunkwan University, Suwon 16419, Korea
| | - Rashid Bashir
- Holonyak Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Carle Illinois College of Medicine, Urbana, Illinois 61801, United States
- Mayo-Illinois Alliance for Technology Based Healthcare, Urbana, Illinois 61801, United States
| | - Sei Young Lee
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea
| | - Sang Woo Lee
- Department of Biomedical Engineering, Yonsei University, Wonju 26493, Korea
| |
Collapse
|
11
|
Li Y, Xie L, Yuan J, Liu H. A sensitive fluorometric sensor for Ag + based on the hybridization chain reaction coupled with a glucose oxidase dual-signal amplification strategy. RSC Adv 2020; 10:26239-26245. [PMID: 35519757 PMCID: PMC9055297 DOI: 10.1039/d0ra04202a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 06/24/2020] [Indexed: 12/28/2022] Open
Abstract
In this work, an efficient and sensitive fluorometric sensor was developed to detect silver ions (Ag+). It is based on the cytosine–Ag+–cytosine (C–Ag+–C) structure via a dual-signal amplification strategy using glucose oxidase (GOx) and the hybridization chain reaction (HCR). A silver-coated glass slide (SCGS) acts as an ideal material for separation. Cytosine rich (C-rich) capture DNA (C-DNA) assembled themselves on the SCGS via Ag–S bonds and hybridized with signal DNA (S-DNA) to trigger the HCR. With specific base-pairing, the S-DNA and HCR products bind on the SCGS. Then, the GOx–biotin–streptavidin (SA) complexes bind to the HCR products through SA–biotin interactions. Owing to the formation of a particular C–Ag+–C structure between two neighboring C-rich C-DNA on the SCGS, the C-DNA/S-DNA/HP1-GOx/HP2-GOx complex gradually moved away from the SCGS as the concentration of Ag+ increased and the combined GOx fell into the buffer. H2O2 could be generated during the oxidation of glucose, catalyzed by GOx in the buffer. Afterward, H2O2 could oxidize the substrate (3-(p-hydroxyphenyl)-propanoic acid) when Horseradish peroxidase was present, giving rise to blue fluorescence. The proposed strategy reached a limit of detection (LOD) of 1.8 pmol L−1 with a linear detection range of 5 to 1000 pmol L−1 for Ag+. Moreover, this assay has been commendably used for the detection of Ag+ in actual samples with fairly good results. An assay for Ag+ based on a C–Ag+–C structure by utilizing a HCR/GOx dual-signal amplification strategy and SCGS as an ideal separation material.![]()
Collapse
Affiliation(s)
- Yubin Li
- College of Chemistry and Environment, Guangdong Ocean University Zhanjiang 524088 China
| | - Ling Xie
- College of Chemistry and Environment, Guangdong Ocean University Zhanjiang 524088 China
| | - Jiaming Yuan
- College of Chemistry and Environment, Guangdong Ocean University Zhanjiang 524088 China
| | - Huazhong Liu
- College of Chemistry and Environment, Guangdong Ocean University Zhanjiang 524088 China
| |
Collapse
|
12
|
Rodríguez-Lavado J, Lorente A, Flores E, Ochoa A, Godoy F, Jaque P, Saitz C. Elucidating sensing mechanisms of a pyrene excimer-based calix[4]arene for ratiometric detection of Hg(ii) and Ag(i) and chemosensor behaviour as INHIBITION or IMPLICATION logic gates. RSC Adv 2020; 10:21963-21973. [PMID: 35516608 PMCID: PMC9054513 DOI: 10.1039/d0ra04092d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 05/27/2020] [Indexed: 12/28/2022] Open
Abstract
This article reports the synthesis and characterisation of two lower rim calix[4]arene derivatives with thiourea as spacer and pyrene or methylene-pyrene as fluorophore. Both derivatives exhibit a fluorimetric response towards Hg2+, Ag+ and Cu2+. Only methylene-pyrenyl derivative 2 allows for selective detection of Hg2+ and Ag+ by enhancement or decrease of excimer emission, respectively. The limits of detection of 2 are 8.11 nM (Hg2+) and 2.09 nM (Ag+). DFT and TD-DFT computational studies were carried out and used to identify possible binding modes that explain the observed response during fluorescence titrations. Calculations revealed the presence of different binding sites depending on the conformation of 2, which suggest a reasonable explanation for non-linear changes in fluorescence depending on the physical nature of the interaction between metal centre and conformer. INHIBITION and IMPLICATION logic gates have also been generated monitoring signal outputs at pyrene monomer (395 nm) and excimer (472 nm) emission, respectively. Thus 2 is a potential primary sensor towards Ag+ and Hg2+ able to configure two different logic gate operations.
Collapse
Affiliation(s)
- Julio Rodríguez-Lavado
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile Olivos 1007 Independencia Santiago Chile
| | - Alejandro Lorente
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile Olivos 1007 Independencia Santiago Chile
| | - Erick Flores
- Departamento de Química de Los Materiales, Universidad de Santiago de Chile Libertador Bernardo ÓHiggins 3363 Santiago RM Chile
| | - Andrés Ochoa
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile Olivos 1007 Independencia Santiago Chile
| | - Fernando Godoy
- Departamento de Química de Los Materiales, Universidad de Santiago de Chile Libertador Bernardo ÓHiggins 3363 Santiago RM Chile
| | - Pablo Jaque
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile Olivos 1007 Independencia Santiago Chile
| | - Claudio Saitz
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile Olivos 1007 Independencia Santiago Chile
| |
Collapse
|
13
|
Lee B, Lee JS, Yoon HJ, Hong SH, Song JK. Generation and manipulation of isotropic droplets in nematic medium using switchable dielectrophoresis. Phys Rev E 2020; 101:012704. [PMID: 32069560 DOI: 10.1103/physreve.101.012704] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Indexed: 01/08/2023]
Abstract
Dielectrophoresis (DEP) in a medium with anisotropic dielectric susceptibility is very different from typical DEP in an isotropic medium: The direction of particle actuation can be switched depending on the direction of the susceptibility tensor of the medium. However, the understanding of switchable DEP (SDEP) in an anisotropic medium is still in its infant stage. Here, we investigate SDEP using heat-generated isotropic droplets in a nematic liquid crystal (LC) medium. We demonstrate that the location of the generation of isotropic droplets can be partially controlled by controlling the temperature gradient within the LC cell using dielectric loss. The SDEP actuation of isotropic droplets is also highly dependent on the location of the isotropic droplets. Using this method, we fabricated different array patterns of isotropic and nematic phase separations under different applied signals.
Collapse
Affiliation(s)
- Bomi Lee
- Department of Electrical & Computer Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Jun-Seo Lee
- Department of Electrical & Computer Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Hyun-Jin Yoon
- Department of Electrical & Computer Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea.,Merck Performance Materials Ltd., Pyeongtaek 17956, Republic of Korea
| | - Seung-Ho Hong
- Department of Electrical & Computer Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
| | - Jang-Kun Song
- Department of Electrical & Computer Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea
| |
Collapse
|
14
|
Zhang D, Wang H. Fluorescence Anisotropy Reduction of An Allosteric G-Rich Oligonucleotide for Specific Silver Ion and Cysteine Detection Based on the G-Ag +-G Base Pair. Anal Chem 2019; 91:14538-14544. [PMID: 31650829 DOI: 10.1021/acs.analchem.9b03556] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Silver is a common heavy metal, and the detection of silver ion (Ag+) is of great importance because of its wide application and hazardous effect on the environment and human health. However, it is a great challenge to produce a large fluorescence anisotropy (FA) change for small molecules (e.g, Ag+). Herein, we describe a novel fluorescence anisotropy reduction approach for the sensitive and specific detection of Ag+. The feasibility of this method is demonstrated through screening a number of guanine-rich oligonucleotide probes. By selectively labeling the oligonucleotides with a single fluorophore tetramethylrhodamine (TMR), the reduction in FA response is associated with the conformation change from the unfolded to a hairpin-like folded structure by inducing formation of the intermolecular G-Ag+-G base pair, which diminishes the interaction between guanine and TMR by photoinduced electron transfer (PET). The change in FA allows the selective detection of Ag+ at a concentration as low as 0.5 nM with a dynamic range from 2.0 to 100 nM. The interference from the other 14 metal ions with a 100-fold even to a 1000-fold excess amount is negligible. This simple and cost-effective probe was further explored to determine cysteine (Cys) based on competing with a guanine-rich oligonucelotide for Ag+-binding.
Collapse
Affiliation(s)
- Dapeng Zhang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Hailin Wang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China.,University of Chinese Academy of Sciences , Beijing 100049 , China
| |
Collapse
|
15
|
Xiao W, Gao Y, Zhang Y, Li J, Liu Z, Nie J, Li J. Enhanced 3D paper-based devices with a personal glucose meter for highly sensitive and portable biosensing of silver ion. Biosens Bioelectron 2019; 137:154-160. [PMID: 31096081 DOI: 10.1016/j.bios.2019.05.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 04/20/2019] [Accepted: 05/02/2019] [Indexed: 01/27/2023]
Abstract
A variety of routine methods are available for the detection of silver (I) (Ag+) ions, but most of them rely on expensive, sophisticated and desktop instruments. Herein, a low-cost, instrument-free and portable Ag+ biosensor was described by initially designing a new class of 3D origami microfluidic paper-based analytical devices (μPADs) into each of which one piece of reagent-loaded nanoporous membrane was integrated. It combines analyte-triggered self-growing of silver nanoparticles to block the membrane's pores in situ for rapid yet efficient signal amplification with a handheld personal glucose meter for a portable and sensitive quantitative readout based on the biocatalytic reactions between the glucose oxidase and glucose. Its utility is well demonstrated with the specific detection of the analyte with a limit of detection as low as ∼58.1 pM (3σ), which makes this new biosensing method one of the most sensitive Ag+ assays in comparison with many other typical methods recently reported. Moreover, the satisfactory recovery of analyzing several types of real water examples, i.e., tap water, drinking water, pond water and soil water, additionally validates its feasibility for practical applications.
Collapse
Affiliation(s)
- Wencheng Xiao
- College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, PR China
| | - Yiming Gao
- College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, PR China
| | - Yun Zhang
- College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, PR China.
| | - Jiao Li
- College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, PR China
| | - Zhaoying Liu
- College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, PR China
| | - Jinfang Nie
- College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, PR China.
| | - Jianping Li
- College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, PR China
| |
Collapse
|
16
|
Colorimetric assay for ultrasensitive detection of Ag(I) ions based on the formation of gold nanoparticle oligomers. Anal Bioanal Chem 2019; 411:2439-2445. [DOI: 10.1007/s00216-019-01685-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 02/10/2019] [Accepted: 02/12/2019] [Indexed: 10/27/2022]
|
17
|
Dielectrophoresis Manipulation: Versatile Lateral and Vertical Mechanisms. BIOSENSORS-BASEL 2019; 9:bios9010030. [PMID: 30813614 PMCID: PMC6468784 DOI: 10.3390/bios9010030] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Revised: 01/24/2019] [Accepted: 01/30/2019] [Indexed: 12/11/2022]
Abstract
Discussing the topic of the capability of dielectrophoresis (DEP) devices in terms of the selective detection and rapid manipulation of particles based on the DEP force (FDEP) via contactless methods is challenging in medical research, drug discovery and delivery. Nonetheless, the process of the selective detection and rapid manipulation of particles via contactless DEP based on dielectric particles and the surrounding medium can reduce the effects of major issues, including physical contact with the particles and medium contamination to overcome operational difficulties. In this review, DEP microelectromechanical system (MEMS) microelectrodes with a tapered profile for the selective detection and rapid manipulation of particles were studied and compared with those of conventional designs with a straight-cut profile. The main objective of this manuscript is to review the versatile mechanism of tapered DEP MEMS microelectrodes for the purpose of selective detection and rapid manipulation. Thus, this review provides a versatile filtration mechanism with the potential for a glomerular-based membrane in an artificial kidneys’ development solution for implementing engineered particles and cells by lateral attraction as well as vertical repulsion in the development of lab-on-a-chip applications. For tapered DEP MEMS microelectrodes, the scope of this study methodology involved the characterisation of DEP, modelling of the polarisation factor and the dynamic dielectric changes between the particles and medium. Comprehensive discussions are presented on the capability of tapered DEP microelectrodes to drive the selected particles and the simulation, fabrication and testing of the tapered profile. This study revealed an outstanding performance with the capability of producing two regions of high electric field intensity at the bottom and top edges of the side wall of tapered microelectrodes. Observations on particle separation mainly by the lateral attraction force of particles with positive DEP on the y-axis and vertical repulsion force of particles with negative DEP on the z-axis proved an efficient and uniform FDEP produced by tapered electrodes. In conclusion, this study confirmed the reliability and efficiency of the tapered DEP microelectrodes in the process of selective detection and rapid manipulation at a higher efficiency rate than straight-cut microelectrodes, which is significant in DEP technology applications.
Collapse
|
18
|
Lee D, Lee H, Lee G, Kim I, Lee SW, Kim W, Lee SW, Lee JH, Park J, Yoon DS. Extremely sensitive and wide-range silver ion detection via assessing the integrated surface potential of a DNA-capped gold nanoparticle. NANOTECHNOLOGY 2019; 30:085501. [PMID: 30524017 DOI: 10.1088/1361-6528/aaf66f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
With the rapid development of nanotechnology and its associated waste stream, public concern is growing over the potential toxicity exposure to heavy metal ions poses to the human body and the environment. Herein, we report an extremely sensitive Kelvin probe force microscopy (KPFM)-based platform for detecting nanotoxic materials (e.g. Ag+) accomplished by probing the integrated surface potential differences of a single gold nanoparticle on which an interaction between probe DNA and target DNA occurs. This interaction can amplify the surface potential of the nanoparticle owing to the coordination bond mediated by Ag+ (cytosine-Ag+-cytosine base pairs). Interestingly, compared with conventional methods, this platform is capable of extremely sensitive Ag+ detection (∼1 fM) in a remarkably wide-range (1 fM to 1 μM). Furthermore, this platform enables Ag+ detection in a practical sample (general drinking water), and this KPFM-based technique may have the potential to detect other toxic heavy metal ions and single nucleotide polymorphisms by designing specific DNA sequences.
Collapse
Affiliation(s)
- Dongtak Lee
- School of Biomedical Engineering, Korea University, Seoul 02841, Republic of Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Cheng Z, Bai Z, Dai Y, Luo L, Liu X. Benzimidazole-containing aramid nanofiber for naked-eye detection of heavy metal ions. Analyst 2018; 143:5225-5233. [DOI: 10.1039/c8an01484a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The rapid detection of heavy metal ions in wastewater has received significant attention in modern society.
Collapse
Affiliation(s)
- Zheng Cheng
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Material and Engineering
- Sichuan University
- Chengdu 610065
- People's Republic of China
| | - Zhenyuan Bai
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Material and Engineering
- Sichuan University
- Chengdu 610065
- People's Republic of China
| | - Yu Dai
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Material and Engineering
- Sichuan University
- Chengdu 610065
- People's Republic of China
| | - Longbo Luo
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Material and Engineering
- Sichuan University
- Chengdu 610065
- People's Republic of China
| | - Xiangyang Liu
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Material and Engineering
- Sichuan University
- Chengdu 610065
- People's Republic of China
| |
Collapse
|
20
|
Yan Z, Zhao Q, Wen M, Hu L, Zhang X, You J. A novel polydentate ligand chromophore for simultaneously colorimetric detection of trace Ag + and Fe3 . SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 186:17-22. [PMID: 28600992 DOI: 10.1016/j.saa.2017.06.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Revised: 05/31/2017] [Accepted: 06/05/2017] [Indexed: 06/07/2023]
Abstract
A novel polydentate ligand chromophore, 3,6-di-(N-ethyl-N-ethoxyl phenylazo) acridine (EEPA), was identified and synthesized. After its structure was characterized by FTIR, 1H NMR, mass spectra and element analyses, it was noted to find that there was a simultaneously colorimetric response to Ag+ and Fe3+ accompanying with different color changes, i.e., from brown to light purple for Ag+ and further to purple-red for Fe3+, respectively. Their different action mechanisms, a 1:2 complex mode for EEPA-Ag+ and 1:1 for EEPA-Fe3+, were investigated and confirmed by means of Job's plot and theoretical calculation. EEPA would be a potential colorimetric chemo-dosimeter for simultaneous detection of Ag+ and Fe3+ with the detection limits of 1.6nmol·L-1 and 69nmol·L-1, respectively.
Collapse
Affiliation(s)
- Zhengquan Yan
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China; Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu 273165, China.
| | - Qi Zhao
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China; Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu 273165, China
| | - Meijun Wen
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China; Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu 273165, China
| | - Lei Hu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China; Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu 273165, China.
| | - Xuezhong Zhang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China; Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu 273165, China
| | - Jinmao You
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China; Shandong Key Laboratory of Life-Organic Analysis, Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, Qufu Normal University, Qufu 273165, China.
| |
Collapse
|
21
|
Automated Dielectrophoretic Tweezers-Based Force Spectroscopy System in a Microfluidic Device. SENSORS 2017; 17:s17102272. [PMID: 28976941 PMCID: PMC5677021 DOI: 10.3390/s17102272] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 09/22/2017] [Accepted: 09/29/2017] [Indexed: 11/17/2022]
Abstract
We reported an automated dielectrophoretic (DEP) tweezers-based force spectroscopy system to examine intermolecular weak binding interactions, which consists of three components: (1) interdigitated electrodes and micro-sized polystyrene particles used as DEP tweezers and probes inside a microfluidic device, along with an arbitrary function generator connected to a high voltage amplifier; (2) microscopy hooked up to a high-speed charge coupled device (CCD) camera with an image acquisition device; and (3) a computer aid control system based on the LabVIEW program. Using this automated system, we verified the measurement reliability by measuring intermolecular weak binding interactions, such as hydrogen bonds and Van der Waals interactions. In addition, we also observed the linearity of the force loading rates, which is applied to the probes by the DEP tweezers, by varying the number of voltage increment steps and thus affecting the linearity of the force loading rates. This system provides a simple and low-cost platform to investigate intermolecular weak binding interactions.
Collapse
|
22
|
Li Z, Liu R, Xing G, Wang T, Liu S. A novel fluorometric and colorimetric sensor for iodide determination using DNA-templated gold/silver nanoclusters. Biosens Bioelectron 2017; 96:44-48. [DOI: 10.1016/j.bios.2017.01.005] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Accepted: 01/04/2017] [Indexed: 11/24/2022]
|
23
|
Gupta S, Kumar V, Joshi KB. Solvent mediated photo-induced morphological transformation of AgNPs-peptide hybrids in water-EtOH binary solvent mixture. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.03.114] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|