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Majeed N, ul Amin N, Masood Siddiqi H. Non‐Enzymatic Liquid Crystal‐Based Detection of Copper Ions in Water. ChemistrySelect 2023. [DOI: 10.1002/slct.202204433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Nasir Majeed
- Department of Chemistry Quaid-i-Azam University Islamabad Pakistan
| | - Noor ul Amin
- Department of Chemistry Quaid-i-Azam University Islamabad Pakistan
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2
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Wang S, Qi Y, Chen Q, Zhang G, Liu B, Xiao F, Zhou J, Wu Z, Yu R. Control of Liquid Crystal Microarray Optical Signals Using a Microspectral Mode Based on Photonic Crystal Structures. Anal Chem 2021; 93:11887-11895. [PMID: 34398607 DOI: 10.1021/acs.analchem.1c02920] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, a novel liquid crystal microarray (LCM) film with optical regulation ability is first constructed by combining liquid crystals (LC) and the highly ordered microporous structure of inverse opal photonic crystals (IOPhCs). The LCM films are fabricated by infiltrating LC molecules into the LC polymer with the structure of IOPhCs, and their properties are very different from those without the LC. Interestingly, the optical property of LCM films can be controlled by changing the orientation of LC molecules, which varies with the interfacial force. In combination with polarization images, spectral reflection peak, circular dichroism spectra, potential difference, and fluorescence images of LCM films, the mechanism of this change is investigated. It is found that the exposed basic group of single-stranded DNA is the key to the change of the optical property of LC microarrays. Meanwhile, the optical signals of LC microarrays based on the PhCs provide a novel LC signal mode for an LC sensing system (microspectral signal mode), and it can be recorded by a fiber-optic spectrometer, which is a great improvement on LC sensing signals. Therefore, the LC microarray sensing signal can be used for accurate analysis of targets by the change of the reflection peak intensity of PhCs. When the LC molecules are induced by different aptamers, the LC microarray sensing interface can be further used for the determination of different targets, such as cocaine and Hg2+. The research on LCM films is of significant value for the development of LC sensing technology and also shows great application prospects in biochemical sensing fields.
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Affiliation(s)
- Shihong Wang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Yue Qi
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Qianshan Chen
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Guannan Zhang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Bing Liu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Fubing Xiao
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China.,Hunan Province Key Laboratory of Typical Environmental Pollution and Health Hazards, College of Public Health, University of South China, Hengyang 421001, People's Republic of China
| | - Jun Zhou
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Zhaoyang Wu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Ruqin Yu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
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3
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Sun H, Qiu Y, Lu Y, Kong J, Zhang X. Ultrasensitive DNA electrochemical biosensor based on MnTBAP biomimetic catalyzed AGET ATRP signal amplification reaction. Chem Commun (Camb) 2020; 56:6636-6639. [DOI: 10.1039/d0cc02176h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In this paper, an ultrasensitive, highly selective and green electrochemical biosensor for quantifying DNA sequences (aM DNA) based on a MnTBAP catalyst for AGET ATRP reaction is proposed.
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Affiliation(s)
- Haobo Sun
- Research Center for Biomedical and Health Science
- Anhui Science and Technology University
- Fengyang 233100
- P. R. China
- School of Environmental and Biological Engineering
| | - Yunliang Qiu
- Department of Criminal Science and Technology
- Nanjing Forest Police College
- Nanjing 210023
- P. R. China
| | - Yajie Lu
- Research Center for Biomedical and Health Science
- Anhui Science and Technology University
- Fengyang 233100
- P. R. China
| | - Jinming Kong
- School of Environmental and Biological Engineering
- Nanjing University of Science and Technology
- Nanjing 210094
- P. R. China
| | - Xueji Zhang
- School of Biomedical Engineering
- Shenzhen University Health Science Center
- Shenzhen
- P. R. China
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4
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Wang S, Zhang G, Chen Q, Zhou J, Wu Z. Sensing of cocaine using polarized optical microscopy by exploiting the conformational changes of an aptamer at the water/liquid crystal interface. Mikrochim Acta 2019; 186:724. [DOI: 10.1007/s00604-019-3855-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 09/19/2019] [Indexed: 11/29/2022]
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5
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Preparation of DNA-functionalized surfaces for simultaneous homeotropic orientation of liquid crystals and optical recognition of analytes: application to the determination of progesterone. Mikrochim Acta 2019; 186:443. [PMID: 31197484 DOI: 10.1007/s00604-019-3558-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 05/24/2019] [Indexed: 12/13/2022]
Abstract
The work describes a simplified method for the preparation of liquid crystal (LC) bioassay using DNA-based capture molecules and having lower detection limits. The capture DNA probes of the stem-loop structure were immobilized on the surface of a glass slide. A homeotropic orientation of LC molecules can be obtained with the proper surface coverage of capture DNA probes. In the presence of analytes (specifically shown here for the progesterone as a model analyte), the molecular binding between capture DNA probes and progesterone opens the loop of the capture DNA probes. The opened sequence is then amenable to hybridization with a reporter DNA probe that is immobilized on gold nanoparticles. This changes the surface microstructure, disrupts the orientation of LC molecules, and results in an enhanced optical response, expressed as the average grey value of the images. This new kind of surface treatment for simultaneous recognition of target molecules and homeotropic anchoring of LCs reduces the number of preparation steps and makes the process of LC bioassay easier. This method has a detection limit as low as 0.1 pmol·L-1 of progesterone. Graphical abstract Schematic presentation of the liquid crystal-based DNA assay. DMOAP: Dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride; TEA: Triethoxsilylbutyraldehyde; 5CB: 4-cyano-4'-pentylbiphenyl; P4: progesterone.
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Wang Y, Hu Q, Tian T, Gao Y, Yu L. A liquid crystal-based sensor for the simple and sensitive detection of cellulase and cysteine. Colloids Surf B Biointerfaces 2016; 147:100-105. [DOI: 10.1016/j.colsurfb.2016.07.059] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Revised: 07/26/2016] [Accepted: 07/28/2016] [Indexed: 01/31/2023]
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7
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Kim HJ, Jang CH. Micro-capillary sensor for imaging trypsin activity using confined nematic liquid crystals. J Mol Liq 2016. [DOI: 10.1016/j.molliq.2016.07.099] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Padmini V, Babu PN, Nair GG, Rao DSS, Yelamaggad CV. Optically Biaxial, Re-entrant and Frustrated Mesophases in Chiral, Non-symmetric Liquid Crystal Dimers and Binary Mixtures. Chem Asian J 2016; 11:2897-2910. [DOI: 10.1002/asia.201600918] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Vediappen Padmini
- Centre for Nano and Soft Matter Sciences; P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru 560013 India
- Department of Organic Chemistry; School of Chemistry, Madurai Kamaraj University; Madurai 625021, Tamil Nadu India
| | - Palakurthy Nani Babu
- Centre for Nano and Soft Matter Sciences; P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru 560013 India
| | - Geetha G. Nair
- Centre for Nano and Soft Matter Sciences; P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru 560013 India
| | - D. S. Shankar Rao
- Centre for Nano and Soft Matter Sciences; P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli Bengaluru 560013 India
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Lee K, Gupta KC, Park SY, Kang IK. Anti-IgG-anchored liquid crystal microdroplets for label free detection of IgG. J Mater Chem B 2016; 4:704-715. [DOI: 10.1039/c5tb02131f] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
AIgG anchored LC microdroplets showing configurational transition from radial (a) to bipolar (b) upon interaction with IgG.
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Affiliation(s)
- Kyubae Lee
- Department of Polymer Science and Engineering
- Kyungpook National University
- Daegu 702-701
- Republic of Korea
| | - Kailash Chandra Gupta
- Department of Polymer Science and Engineering
- Kyungpook National University
- Daegu 702-701
- Republic of Korea
- Polymer Research Laboratory
| | - Soo-Young Park
- Department of Polymer Science and Engineering
- Kyungpook National University
- Daegu 702-701
- Republic of Korea
| | - Inn-Kyu Kang
- Department of Polymer Science and Engineering
- Kyungpook National University
- Daegu 702-701
- Republic of Korea
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A cationic surfactant-decorated liquid crystal sensing platform for simple and sensitive detection of acetylcholinesterase and its inhibitor. Biosens Bioelectron 2015; 72:25-30. [PMID: 25957073 DOI: 10.1016/j.bios.2015.05.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 04/25/2015] [Accepted: 05/01/2015] [Indexed: 01/15/2023]
Abstract
In this paper, construction of the liquid crystal (LC)-based sensing platform for simple and sensitive detection of acetylcholinesterase (AChE) and its inhibitor using a cationic surfactant-decorated LC interface was demonstrated. A change of the optical images of LCs from bright to dark appearance was observed when the cationic surfactant, myristoylcholine chloride (Myr), was transferred onto the aqueous/LC interface, due to the formation of a stable surfactant monolayer at the interface. A dark-to-bright change of the optical appearance was then observed when AChE was transferred onto the Myr-decorated LC interface. The sensitivity of this new type of LC-based sensor is 3 orders of magnitude higher in the serum albumin solution than that only in the buffer solution. Noteworthy is that the AChE LC sensor shows a very high sensitivity for the detection of the enzyme inhibitor, which is around 1 fM. The constructed low-cost LC-based sensor is quite simple and convenient, showing high promise for label-free detection of AChE and its inhibitors.
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11
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Zhou CH, Wu Z, Chen JJ, Xiong C, Chen Z, Pang DW, Zhang ZL. Biometallization-Based Electrochemical Magnetoimmunosensing Strategy for Avian Influenza A (H7N9) Virus Particle Detection. Chem Asian J 2015; 10:1387-93. [DOI: 10.1002/asia.201500105] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Indexed: 12/15/2022]
Affiliation(s)
- Chuan-Hua Zhou
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education); College of Chemistry and Molecular Sciences; State Key Laboratory of Virology; Wuhan University; Wuhan 430072 P. R. China
- Key Laboratory of Medicinal Chemistry for Natural Resource (Ministry of Education); School of Chemical Science and Technology; Yunnan University; Kunming 650091 P. R. China
| | - Zhen Wu
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education); College of Chemistry and Molecular Sciences; State Key Laboratory of Virology; Wuhan University; Wuhan 430072 P. R. China
| | - Jian-Jun Chen
- CAS Key Laboratory of Special Pathogens and Biosafety; Wuhan Institute of Virology; Chinese Academy of Sciences; Wuhan 430071 P. R. China
| | - Chaochao Xiong
- CAS Key Laboratory of Special Pathogens and Biosafety; Wuhan Institute of Virology; Chinese Academy of Sciences; Wuhan 430071 P. R. China
| | - Ze Chen
- Shanghai Institute of Biological Products; P. R. China
| | - Dai-Wen Pang
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education); College of Chemistry and Molecular Sciences; State Key Laboratory of Virology; Wuhan University; Wuhan 430072 P. R. China
| | - Zhi-Ling Zhang
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education); College of Chemistry and Molecular Sciences; State Key Laboratory of Virology; Wuhan University; Wuhan 430072 P. R. China
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12
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Tan H, Li X, Liao S, Yu R, Wu Z. Highly-sensitive liquid crystal biosensor based on DNA dendrimers-mediated optical reorientation. Biosens Bioelectron 2014; 62:84-9. [DOI: 10.1016/j.bios.2014.06.029] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 05/25/2014] [Accepted: 06/13/2014] [Indexed: 10/25/2022]
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13
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Hu Q, Hu W, Kong J, Zhang X. PNA-based DNA assay with attomolar detection limit based on polygalacturonic acid mediated in-situ deposition of metallic silver on a gold electrode. Mikrochim Acta 2014. [DOI: 10.1007/s00604-014-1351-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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14
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Zhang M, Jang CH. Sensitive detection of trypsin using liquid-crystal droplet patterns modulated by interactions between poly-L-lysine and a phospholipid monolayer. Chemphyschem 2014; 15:2569-74. [PMID: 24850496 DOI: 10.1002/cphc.201402120] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Indexed: 01/08/2023]
Abstract
Liquid-crystal (LC) droplet patterns are formed on a glass slide by evaporating a solution of nematic LC dissolved in heptane. In the presence of an anionic phospholipid, 1,2-dioleoyl-sn-glycero-3-phospho-rac-(1-glycerol) (DOPG), the LCs display a dark cross pattern, indicating a homeotropic orientation. When LC patterns are incubated with an aqueous mixture of DOPG and poly-L-lysine (PLL), there is a transition in the LC pattern from a dark cross to a bright fan shape due to the electrostatic interaction between DOPG and PLL. Known to catalyze the hydrolysis of PLL into oligopeptide fragments, trypsin is preincubated with PLL, significantly decreasing the interactions between PLL and DOPG. LCs adopt a perpendicular orientation at the water-LC droplet interface, which gives rise to a dark cross pattern. This optical response of LC droplets is the basis for a quick and sensitive biosensor for trypsin.
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Affiliation(s)
- Minmin Zhang
- Department of Chemistry, Gachon University, Seongnam-Si, Gyeonggi-Do 461-701 (Korea)
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15
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1,2,4-Oxadiazole-Based Bent-Core Liquid Crystals with Cybotactic Nematic Phases. Chemphyschem 2014; 15:1323-35. [DOI: 10.1002/cphc.201301070] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Indexed: 11/07/2022]
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16
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Xu JJ, Zhao WW, Song S, Fan C, Chen HY. Functional nanoprobes for ultrasensitive detection of biomolecules: an update. Chem Soc Rev 2013; 43:1601-11. [PMID: 24342982 DOI: 10.1039/c3cs60277j] [Citation(s) in RCA: 171] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
With the rapidly increasing demands for ultrasensitive biodetection, the design and applications of functional nanoprobes have attracted substantial interest for biosensing with optical, electrochemical, and various other means. In particular, given the comparable sizes of nanomaterials and biomolecules, there exists plenty of opportunities to develop functional nanoprobes with biomolecules for highly sensitive and selective biosensing. Over the past decade, numerous nanoprobes have been developed for ultrasensitive bioaffinity sensing of proteins and nucleic acids in both laboratory and clinical applications. In this review, we provide an update on the recent advances in this direction, particularly in the past two years, which reflects new progress since the publication of our last review on the same topic in Chem. Soc. Rev. The types of probes under discussion include: (i) nanoamplifier probes: one nanomaterial loaded with multiple biomolecules; (ii) quantum dots probes: fluorescent nanomaterials with high brightness; (iii) superquenching nanoprobes: fluorescent background suppression; (iv) nanoscale Raman probes: nanoscale surface-enhanced Raman resonance scattering; (v) nanoFETs: nanomaterial-based electrical detection; and (vi) nanoscale enhancers: nanomaterial-induced metal deposition.
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Affiliation(s)
- Jing-Juan Xu
- State Key Laboratory of Analytical Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
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17
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A simple strategy for detecting synthetic polymers on solid surfaces using liquid crystal. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-3015-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Yang S, Wu C, Tan H, Wu Y, Liao S, Wu Z, Shen G, Yu R. Label-Free Liquid Crystal Biosensor Based on Specific Oligonucleotide Probes for Heavy Metal Ions. Anal Chem 2012; 85:14-8. [DOI: 10.1021/ac302989h] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shengyuan Yang
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
- College of Public Health, University of South China, Hengyang 421001, P. R. China
| | - Chao Wu
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Hui Tan
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Yan Wu
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Shuzhen Liao
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Zhaoyang Wu
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Guoli Shen
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Ruqin Yu
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
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Park MK, Jang CH. High-Contrast Imaging of Biomolecular Interactions Using Liquid Crystals Supported on Roller Printed Protein Surfaces. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.10.3269] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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20
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Hu QZ, Jang CH. A simple strategy to monitor lipase activity using liquid crystal-based sensors. Talanta 2012; 99:36-9. [DOI: 10.1016/j.talanta.2012.05.016] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2012] [Revised: 05/07/2012] [Accepted: 05/09/2012] [Indexed: 10/28/2022]
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Han GR, Jang CH. Measuring ligand–receptor binding events on polymeric surfaces with periodic wave patterns using liquid crystals. Colloids Surf B Biointerfaces 2012; 94:89-94. [DOI: 10.1016/j.colsurfb.2012.01.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Revised: 12/09/2011] [Accepted: 01/18/2012] [Indexed: 10/14/2022]
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Hu QZ, Jang CH. Imaging trypsin activity through changes in the orientation of liquid crystals coupled to the interactions between a polyelectrolyte and a phospholipid layer. ACS APPLIED MATERIALS & INTERFACES 2012; 4:1791-1795. [PMID: 22394113 DOI: 10.1021/am300043d] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this study, we developed a new type of liquid crystal (LC)-based sensor for the real-time and label-free monitoring of enzymatic activity through changes in the orientation of LCs coupled to the interactions between polyelectrolyte and phospholipid. The LCs changed from dark to bright after an aqueous solution of poly-l-lysine (PLL) was transferred onto a self-assembled monolayer of the phospholipid, dioleoyl-sn-glycero-3-phospho-rac-(1-glycerol) sodium salt (DOPG), at the aqueous/LC interface. Interactions between the positively charged PLL and the negatively charged DOPG drove the reorganization of the phospholipid membrane, which induced an orientational transition in the LCs from a homeotropic to planar state. Since the serine endopeptidase trypsin can enzymatically catalyze the hydrolysis of PLL, the dark-to-bright shift in the optical response was not observed after transferring a mixed solution of PLL and trypsin onto the DOPG-decorated LC interface, indicating that no orientational transitions in the LCs occurred. However, the optical response from dark to bright was observed when the mixture in the optical cell was replaced by an aqueous solution of PLL. Control experiments with trypsin or an aqueous mixture of PLL and deactivated trypsin further confirmed the feasibility of this approach. The detection limit of trypsin was determined to be ~1 μg/mL. This approach holds great promise for use in the development of LC-based sensors for the detection of enzymatic reactions in cases where the biological polyelectrolyte substrates of enzymes could disrupt the organization of the membrane and induce orientational transitions of LCs at the aqueous/LC interface.
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Affiliation(s)
- Qiong-Zheng Hu
- Department of BioNano Technology, Gachon University, San 65, Bokjeong-Dong, Sujeong-Gu, Seongnam-City, Gyeonggi-Do, 461-701, Korea
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Hu QZ, Jang CH. A new strategy for imaging biomolecular events through interactions between liquid crystals and oil-in-water emulsions. Analyst 2012; 137:5204-7. [DOI: 10.1039/c2an35607d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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24
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Liao S, Qiao Y, Han W, Xie Z, Wu Z, Shen G, Yu R. Acetylcholinesterase Liquid Crystal Biosensor Based on Modulated Growth of Gold Nanoparticles for Amplified Detection of Acetylcholine and Inhibitor. Anal Chem 2011; 84:45-9. [DOI: 10.1021/ac202895j] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Shuzhen Liao
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Yanan Qiao
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Wenting Han
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Zhaoxia Xie
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Zhaoyang Wu
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Guoli Shen
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Ruqin Yu
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
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