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Subedi A, Yang D, Chin WK, Tamang B, Sahoo S, Yancey P, Mahbub R, Shield J, Lai RY, Xu X, Dowben PA, Rangari V. An interpretation for the components of 2 p3/2core level x-ray photoelectron spectra of the cations in some inverse spinel oxides. J Phys Condens Matter 2024; 36:285001. [PMID: 38467066 DOI: 10.1088/1361-648x/ad3271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 03/11/2024] [Indexed: 03/13/2024]
Abstract
In an effort to reconcile the various interpretations for the cation components of the 2p3/2observed in x-ray photoelectron spectroscopy (XPS) of several spinel oxide materials, the XPS spectra of both spinel alloy nanoparticles and crystalline thin films are compared. We observed that different components of the 2p3/2core level XPS spectra, of these inverse spinel thin films, are distinctly surface and bulk weighted, indicating surface-to-bulk core level shifts in the binding energies. Surface-to-bulk core level shifts in binding energies of Ni and Fe 2p3/2core levels of NiFe2O4thin film are observed in angle-resolved XPS. The ratio between surface-weighted components and bulk-weighted components of the Ni and Fe core levels shows appreciable dependency on photoemission angle, with respect to surface normal. XPS showed that the ferrite nanoparticles NixCo1-xFe2O4(x= 0.2, 0.5, 0.8, 1) resemble the surface of the NiFe2O4thin film. Surface-to-bulk core level shifts are also observed in CoFe2O4and NiCo2O4thin films but not as significantly as in NiFe2O4thin film. Estimates of surface stoichiometry of some spinel oxide nanoparticles and thin films suggested that the apportionment between cationic species present could be farther from expectations for thin films as compared to what is seen with nanoparticles.
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Affiliation(s)
- Arjun Subedi
- Department of Physics and Astronomy, Theodore Jorgensen Hall, University of Nebraska-Lincoln, 855 North 16th Street, Lincoln, NE 68588-0299, United States of America
| | - Detian Yang
- Department of Physics and Astronomy, Theodore Jorgensen Hall, University of Nebraska-Lincoln, 855 North 16th Street, Lincoln, NE 68588-0299, United States of America
| | - Wai Kiat Chin
- Department of Physics and Astronomy, Theodore Jorgensen Hall, University of Nebraska-Lincoln, 855 North 16th Street, Lincoln, NE 68588-0299, United States of America
| | - Binny Tamang
- Department of Chemistry, Hamilton Hall, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, United States of America
| | - Sushrisangita Sahoo
- Department of Material Science and Engineering, Tuskegee University, Tuskegee, AL 36088, United States of America
| | - Paul Yancey
- Department of Mechanical Engineering, Materials Processing Laboratory, Tuskegee University, Tuskegee, AL 36088, United States of America
| | - Rifat Mahbub
- Department of Mechanical and Materials Engineering, 339 Nebraska Hall, University of Nebraska, Lincoln, NE 68588-0526, United States of America
| | - Jeffrey Shield
- Department of Mechanical and Materials Engineering, 339 Nebraska Hall, University of Nebraska, Lincoln, NE 68588-0526, United States of America
| | - Rebecca Y Lai
- Department of Chemistry, Hamilton Hall, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, United States of America
| | - Xiaoshan Xu
- Department of Physics and Astronomy, Theodore Jorgensen Hall, University of Nebraska-Lincoln, 855 North 16th Street, Lincoln, NE 68588-0299, United States of America
| | - Peter A Dowben
- Department of Physics and Astronomy, Theodore Jorgensen Hall, University of Nebraska-Lincoln, 855 North 16th Street, Lincoln, NE 68588-0299, United States of America
| | - Vijaya Rangari
- Department of Material Science and Engineering, Tuskegee University, Tuskegee, AL 36088, United States of America
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Lamichhane S, Timalsina R, Schultz C, Fescenko I, Ambal K, Liou SH, Lai RY, Laraoui A. Nitrogen-Vacancy Magnetic Relaxometry of Nanoclustered Cytochrome C Proteins. Nano Lett 2024; 24:873-880. [PMID: 38207217 DOI: 10.1021/acs.nanolett.3c03843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
Nitrogen-vacancy (NV) magnetometry offers an alternative tool to detect paramagnetic centers in cells with a favorable combination of magnetic sensitivity and spatial resolution. Here, we employ NV magnetic relaxometry to detect cytochrome C (Cyt-C) nanoclusters. Cyt-C is a water-soluble protein that plays a vital role in the electron transport chain of mitochondria. Under ambient conditions, the heme group in Cyt-C remains in the Fe3+ state, which is paramagnetic. We vary the concentration of Cyt-C from 6 to 54 μM and observe a reduction of the NV spin-lattice relaxation time (T1) from 1.2 ms to 150 μs, which is attributed to the spin noise originating from the Fe3+ spins. NV T1 imaging of Cyt-C drop-casted on a nanostructured diamond chip allows us to detect the relaxation rates from the adsorbed Fe3+ within Cyt-C.
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Affiliation(s)
- Suvechhya Lamichhane
- Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Rupak Timalsina
- Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Cody Schultz
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Ilja Fescenko
- Laser Center, University of Latvia, Riga, LV-1004, Latvia
| | - Kapildeb Ambal
- Department of Mathematics, Statistics, and Physics, Wichita State University, Wichita, Kansas 67260, United States
| | - Sy-Hwang Liou
- Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Rebecca Y Lai
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Abdelghani Laraoui
- Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
- Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
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3
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Wu G, Zhang ET, Qiang Y, Esmonde C, Chen X, Wei Z, Song Y, Zhang X, Schneider MJ, Li H, Sun H, Weng Z, Santaniello S, He J, Lai RY, Li Y, Bruchas MR, Zhang Y. Long-Term In Vivo Molecular Monitoring Using Aptamer-Graphene Microtransistors. bioRxiv 2023:2023.10.18.562080. [PMID: 37905115 PMCID: PMC10614860 DOI: 10.1101/2023.10.18.562080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
Long-term, real-time molecular monitoring in complex biological environments is critical for our ability to understand, prevent, diagnose, and manage human diseases. Aptamer-based electrochemical biosensors possess the promise due to their generalizability and a high degree of selectivity. Nevertheless, the operation of existing aptamer-based biosensors in vivo is limited to a few hours. Here, we report a first-generation long-term in vivo molecular monitoring platform, named aptamer-graphene microtransistors (AGMs). The AGM incorporates a layer of pyrene-(polyethylene glycol)5-alcohol and DNase inhibitor-doped polyacrylamide hydrogel coating to reduce biofouling and aptamer degradation. As a demonstration of function and generalizability, the AGM achieves the detection of biomolecules such as dopamine and serotonin in undiluted whole blood at 37 °C for 11 days. Furthermore, the AGM successfully captures optically evoked dopamine release in vivo in mice for over one week and demonstrates the capability to monitor behaviorally-induced endogenous dopamine release even after eight days of implantation in freely moving mice. The results reported in this work establish the potential for chronic aptamer-based molecular monitoring platforms, and thus serve as a new benchmark for molecular monitoring using aptamer-based technology.
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Affiliation(s)
- Guangfu Wu
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Eric T. Zhang
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
- Center for Neurobiology of Addiction, Pain, and Emotion, University of Washington, Seattle, WA 98195, USA
| | - Yingqi Qiang
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Colin Esmonde
- Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL 32306, USA
| | - Xingchi Chen
- Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL 32306, USA
| | - Zichao Wei
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA
| | - Yang Song
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Xincheng Zhang
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Michael J. Schneider
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
| | - Huijie Li
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - He Sun
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Zhengyan Weng
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Sabato Santaniello
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
| | - Jie He
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA
| | - Rebecca Y. Lai
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - Yan Li
- Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, FL 32306, USA
| | - Michael R. Bruchas
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
- Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, WA 98195, USA
- Center for Neurobiology of Addiction, Pain, and Emotion, University of Washington, Seattle, WA 98195, USA
- Department of Pharmacology, University of Washington, Seattle, WA 98195, USA
| | - Yi Zhang
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
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Abstract
Polymersomes are polymeric analogues of liposomes with exceptional physical and chemical properties. Despite being dubbed as next-generation vesicles since their inception nearly three decades ago, polymersomes have yet to experience translation into the clinical or industrial settings. This is due to a lack of reliable methods to upscale production without compromising control over polymersome properties. Herein we report a continuous flow methodology capable of producing near-monodisperse polymersomes at scale (≥3 g/h) with the possibility of performing downstream polymersome manipulation. Unlike conventional polymersomes, our polymersomes exhibit metastability under ambient conditions, persisting for a lifetime of ca. 7 days, during which polymersome growth occurs until a dynamic equilibrium state is reached. We demonstrate how this metastable state is key to the implementation of downstream processes to manipulate polymersome size and/or shape in the same continuous stream. The methodology operates in a plug-and-play fashion and is applicable to various block copolymers.
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Affiliation(s)
- Chin Ken Wong
- School of Chemistry, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia.
| | - Rebecca Y Lai
- School of Chemistry, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - Martina H Stenzel
- School of Chemistry, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia.
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Zhang Y, Song Y, Weng Z, Yang J, Avery L, Dieckhaus KD, Lai RY, Gao X, Zhang Y. A point-of-care microfluidic biosensing system for rapid and ultrasensitive nucleic acid detection from clinical samples. Lab Chip 2023; 23:3862-3873. [PMID: 37539483 DOI: 10.1039/d3lc00372h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
Rapid and ultrasensitive point-of-care RNA detection plays a critical role in the diagnosis and management of various infectious diseases. The gold-standard detection method of reverse transcription-quantitative polymerase chain reaction (RT-qPCR) is ultrasensitive and accurate yet limited by the lengthy turnaround time (1-2 days). On the other hand, an antigen test offers rapid at-home detection (typically ~15 min) but suffers from low sensitivity and high false-negative rates. An ideal point-of-care diagnostic device would combine the merits of PCR-level sensitivity and rapid sample-to-result workflow comparable to antigen testing. However, the existing detection platforms typically possess superior sensitivity or rapid sample-to-result time, but not both. This paper reports a point-of-care microfluidic device that offers ultrasensitive yet rapid detection of viral RNA from clinical samples. The device consists of a microfluidic chip for precisely manipulating small volumes of samples, a miniaturized heater for viral lysis and ribonuclease inactivation, a Cas13a-electrochemical sensor for target preamplification-free and ultrasensitive RNA detection, and a smartphone-compatible potentiostat for data acquisition. As demonstrations, the devices achieve the detection of heat-inactivated SARS-CoV-2 samples with a limit of detection down to 10 aM within 25 minutes, which is comparable to the sensitivity of RT-PCR and rapidness of an antigen test. The platform also successfully distinguishes all nine positive unprocessed clinical SARS-CoV-2 nasopharyngeal swab samples from four negative samples within 25 minutes of sample-to-result time. Together, this device provides a point-of-care solution that can be deployed in diverse settings beyond laboratory environments for rapid and accurate detection of RNA from clinical samples. The device can potentially be expandable to detect other viral targets, such as human immunodeficiency virus self-testing and Zika virus, where rapid and ultrasensitive point-of-care detection is required.
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Affiliation(s)
- Yuxuan Zhang
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA.
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Yang Song
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA.
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Zhengyan Weng
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA.
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
| | - Jie Yang
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX 77005, USA
| | - Lori Avery
- Department of Pathology and Laboratory Medicine, UConn Health, Farmington, CT 06030, USA
| | - Kevin D Dieckhaus
- Division of Infectious Diseases, Department of Medicine, UConn Health, Farmington, CT 06030, USA
| | - Rebecca Y Lai
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - Xue Gao
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, TX 77005, USA
- Department of Bioengineering, Rice University, Houston, TX 77005, USA
- Department of Chemistry, Rice University, Houston, TX 77005, USA
| | - Yi Zhang
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT 06269, USA.
- Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
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Lamichhane S, McElveen KA, Erickson A, Fescenko I, Sun S, Timalsina R, Guo Y, Liou SH, Lai RY, Laraoui A. Nitrogen-Vacancy Magnetometry of Individual Fe-Triazole Spin Crossover Nanorods. ACS Nano 2023; 17:8694-8704. [PMID: 37093121 DOI: 10.1021/acsnano.3c01819] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
[Fe(Htrz)2(trz)](BF4) (Fe-triazole) spin crossover molecules show thermal, electrical, and optical switching between high spin (HS) and low spin (LS) states, making them promising candidates for molecular spintronics. The LS and HS transitions originate from the electronic configurations of Fe(II) and are considered to be diamagnetic and paramagnetic, respectively. The Fe(II) LS state has six paired electrons in the ground states with no interaction with the magnetic field and a diamagnetic behavior is usually observed. While the bulk magnetic properties of Fe-triazole compounds are widely studied by standard magnetometry techniques, their magnetic properties at the individual level are missing. Here we use nitrogen vacancy (NV) based magnetometry to study the magnetic properties of the Fe-triazole LS state of nanoparticle clusters and individual nanorods of size varying from 20 to 1000 nm. Scanning electron microscopy (SEM) and Raman spectroscopy are performed to determine the size of the nanoparticles/nanorods and to confirm their respective spin states. The magnetic field patterns produced by the nanoparticles/nanorods are imaged by NV magnetic microscopy as a function of applied magnetic field (up to 350 mT) and correlated with SEM and Raman. We found that in most of the nanorods the LS state is slightly paramagnetic, possibly originating from the surface oxidation and/or the greater Fe(III) presence along the nanorods' edges. NV measurements on the Fe-triazole LS state nanoparticle clusters revealed both diamagnetic and paramagnetic behavior. Our results highlight the potential of NV quantum sensors to study the magnetic properties of spin crossover molecules and molecular magnets.
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Affiliation(s)
- Suvechhya Lamichhane
- Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, 855 North 16th Street, Lincoln, Nebraska 68588, United States
| | - Kayleigh A McElveen
- Department of Chemistry, University of Nebraska-Lincoln, 639 N 12 Street, 651 Hamilton Hall, Lincoln, Nebraska 68588, United States
| | - Adam Erickson
- Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, 900 North 16th Street, West Nebraska Hall 342, Lincoln, Nebraska 68588, United States
| | - Ilja Fescenko
- Laser Center, University of Latvia, Jelgavas St 3, Riga LV-1004, Latvia
| | - Shuo Sun
- Department of Chemistry, University of Nebraska-Lincoln, 639 N 12 Street, 651 Hamilton Hall, Lincoln, Nebraska 68588, United States
| | - Rupak Timalsina
- Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, 900 North 16th Street, West Nebraska Hall 342, Lincoln, Nebraska 68588, United States
| | - Yinsheng Guo
- Department of Chemistry, University of Nebraska-Lincoln, 639 N 12 Street, 651 Hamilton Hall, Lincoln, Nebraska 68588, United States
| | - Sy-Hwang Liou
- Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, 855 North 16th Street, Lincoln, Nebraska 68588, United States
| | - Rebecca Y Lai
- Department of Chemistry, University of Nebraska-Lincoln, 639 N 12 Street, 651 Hamilton Hall, Lincoln, Nebraska 68588, United States
| | - Abdelghani Laraoui
- Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, 855 North 16th Street, Lincoln, Nebraska 68588, United States
- Department of Mechanical & Materials Engineering, University of Nebraska-Lincoln, 900 North 16th Street, West Nebraska Hall 342, Lincoln, Nebraska 68588, United States
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Mishra E, Ekanayaka TK, Panagiotakopoulos T, Le D, Rahman TS, Wang P, McElveen KA, Phillips JP, Zaid Zaz M, Yazdani S, N'Diaye AT, Lai RY, Streubel R, Cheng R, Shatruk M, Dowben PA. Electronic structure of cobalt valence tautomeric molecules in different environments. Nanoscale 2023; 15:2044-2053. [PMID: 36597843 DOI: 10.1039/d2nr06834f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Future molecular microelectronics require the electronic conductivity of the device to be tunable without impairing the voltage control of the molecular electronic properties. This work reports the influence of an interface between a semiconducting polyaniline polymer or a polar poly-D-lysine molecular film and one of two valence tautomeric complexes, i.e., [CoIII(SQ)(Cat)(4-CN-py)2] ↔ [CoII(SQ)2(4-CN-py)2] and [CoIII(SQ)(Cat)(3-tpp)2] ↔ [CoII(SQ)2(3-tpp)2]. The electronic transitions and orbitals are identified using X-ray photoemission, X-ray absorption, inverse photoemission, and optical absorption spectroscopy measurements that are guided by density functional theory. Except for slightly modified binding energies and shifted orbital levels, the choice of the underlying substrate layer has little effect on the electronic structure. A prominent unoccupied ligand-to-metal charge transfer state exists in [CoIII(SQ)(Cat)(3-tpp)2] ↔ [CoII(SQ)2(3-tpp)2] that is virtually insensitive to the interface between the polymer and tautomeric complexes in the CoII high-spin state.
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Affiliation(s)
- Esha Mishra
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
| | - Thilini K Ekanayaka
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
| | | | - Duy Le
- Department of Physics, University of Central Florida, Orlando, FL 32816, USA.
| | - Talat S Rahman
- Department of Physics, University of Central Florida, Orlando, FL 32816, USA.
| | - Ping Wang
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA
| | - Kayleigh A McElveen
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Jared P Phillips
- Department of Physics, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA
| | - M Zaid Zaz
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
| | - Saeed Yazdani
- Department of Physics, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA
| | - Alpha T N'Diaye
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Rebecca Y Lai
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Robert Streubel
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
- Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - Ruihua Cheng
- Department of Physics, Indiana University-Purdue University Indianapolis, Indianapolis, Indiana 46202, USA
| | - Michael Shatruk
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL 32306, USA
| | - Peter A Dowben
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
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Zhou RH, Hou XY, Cheng XH, Pan J, Lai RY, Chen GM, Zhang H, Wei LJ, Zhang L, Liu JX. [Effectiveness of a whole-process health education model among inpatients with ascites type of advanced schistosomiasis]. Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi 2023; 34:626-629. [PMID: 36642904 DOI: 10.16250/j.32.1374.2022124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
OBJECTIVE To evaluate the effectiveness of a whole-process health education model among inpatients with ascites type of advanced schistosomiasis. METHODS A "admission-hospitalization-discharge" whole-process health education model was created, 101 inpatients with ascites type of advanced schistosomiasis were given the whole-process health education. The scores of schistosomiasis control knowledge, attitudes towards schistosomiasis control and healthy behaviors, and awareness of schistosomiasis control knowledge, correct rate of attitudes towards schistosomiasis control and correct rate of healthy behaviors were compared among inpatients with ascites type of advanced schistosomiasis before and after implementation of the whole-process health education. RESULTS The scores of schistosomiasis control knowledge, schistosomiasis control attitudes and healthy behaviors were all significantly higher among inpatients with ascites type of advanced schistosomiasis after implementation of the whole-process health education than before implementation (Z = -7.688, -3.576 and -4.328, all P values < 0.01). In addition, the awareness of schistosomiasis control knowledge increased from 54.3% to 82.7% (χ2 = 188.886, P < 0.01), and the correct rate of attitudes towards schistosomiasis control increased from 88.4% to 98.0% (χ2 = 22.001, P < 0.01), while the correct rate of healthy behaviors increased from 48.2% to 59.7% (χ2 = 11.767, P < 0.01). CONCLUSIONS The whole-process health education model may remarkably improve the awareness of schistosomiasis control knowledge and promote the formation of positive attitudes towards schistosomiasis control and correct behaviors among inpatients with ascites type of advanced schistosomiasis, which is of great significance to facilitate patients' cure.
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Affiliation(s)
- R H Zhou
- Affiliated Xiangyue Hospital of Hunan Provincial Institute of Schistosomiasis Control; WHO Collaborating Center on Schistosomiasis Control in Lake Region of China; Hunan Provincial Key Laboratory of Immunology and Transmission Control on Schistosomiasis Control, Yueyang, Hunan 414000, China
| | - X Y Hou
- Affiliated Xiangyue Hospital of Hunan Provincial Institute of Schistosomiasis Control; WHO Collaborating Center on Schistosomiasis Control in Lake Region of China; Hunan Provincial Key Laboratory of Immunology and Transmission Control on Schistosomiasis Control, Yueyang, Hunan 414000, China
| | - X H Cheng
- Affiliated Xiangyue Hospital of Hunan Provincial Institute of Schistosomiasis Control; WHO Collaborating Center on Schistosomiasis Control in Lake Region of China; Hunan Provincial Key Laboratory of Immunology and Transmission Control on Schistosomiasis Control, Yueyang, Hunan 414000, China
| | - J Pan
- Affiliated Xiangyue Hospital of Hunan Provincial Institute of Schistosomiasis Control; WHO Collaborating Center on Schistosomiasis Control in Lake Region of China; Hunan Provincial Key Laboratory of Immunology and Transmission Control on Schistosomiasis Control, Yueyang, Hunan 414000, China
| | - R Y Lai
- Affiliated Xiangyue Hospital of Hunan Provincial Institute of Schistosomiasis Control; WHO Collaborating Center on Schistosomiasis Control in Lake Region of China; Hunan Provincial Key Laboratory of Immunology and Transmission Control on Schistosomiasis Control, Yueyang, Hunan 414000, China
| | - G M Chen
- Affiliated Xiangyue Hospital of Hunan Provincial Institute of Schistosomiasis Control; WHO Collaborating Center on Schistosomiasis Control in Lake Region of China; Hunan Provincial Key Laboratory of Immunology and Transmission Control on Schistosomiasis Control, Yueyang, Hunan 414000, China
| | - H Zhang
- Affiliated Xiangyue Hospital of Hunan Provincial Institute of Schistosomiasis Control; WHO Collaborating Center on Schistosomiasis Control in Lake Region of China; Hunan Provincial Key Laboratory of Immunology and Transmission Control on Schistosomiasis Control, Yueyang, Hunan 414000, China
| | - L J Wei
- Affiliated Xiangyue Hospital of Hunan Provincial Institute of Schistosomiasis Control; WHO Collaborating Center on Schistosomiasis Control in Lake Region of China; Hunan Provincial Key Laboratory of Immunology and Transmission Control on Schistosomiasis Control, Yueyang, Hunan 414000, China
| | - L Zhang
- Affiliated Xiangyue Hospital of Hunan Provincial Institute of Schistosomiasis Control; WHO Collaborating Center on Schistosomiasis Control in Lake Region of China; Hunan Provincial Key Laboratory of Immunology and Transmission Control on Schistosomiasis Control, Yueyang, Hunan 414000, China
| | - J X Liu
- Affiliated Xiangyue Hospital of Hunan Provincial Institute of Schistosomiasis Control; WHO Collaborating Center on Schistosomiasis Control in Lake Region of China; Hunan Provincial Key Laboratory of Immunology and Transmission Control on Schistosomiasis Control, Yueyang, Hunan 414000, China
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9
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Mishra E, Schultz CM, Lai RY, Dowben PA. Coordination Chemistry of Uranyl Ions with Surface-Immobilized Peptides: An XPS Study. Molecules 2022; 27:molecules27248960. [PMID: 36558092 PMCID: PMC9784848 DOI: 10.3390/molecules27248960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 12/08/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022]
Abstract
The coordination chemistry of uranyl ions with surface immobilized peptides was studied using X-ray photoemission spectroscopy (XPS). All the peptides in the study were modified using a six-carbon alkanethiol as a linker on a gold substrate with methylene blue as the redox label. The X-ray photoemission spectra reveal that each modified peptide interacts differently with the uranyl ion. For all the modified peptides, the XPS spectra were taken in both the absence and presence of the uranium, and their comparison reveals that the interaction depends on the chemical group present in the peptides. The XPS results show that, among all the modified peptides in the current study, the (arginine)9 (R9) modified peptide showed the largest response to uranium. In the order of response to uranium, the second largest response was shown by the modified (arginine)6 (R6) peptide followed by the modified (lysine)6 (K6) peptide. Other modified peptides, (alanine)6 (A6), (glutamic acid)6 (E6) and (serine)6 (S6), did not show any response to uranium.
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Affiliation(s)
- Esha Mishra
- Department of Physics and Astronomy, Theodore Jorgensen Hall, 855 North 16th Street, University of Nebraska-Lincoln, Lincoln, NE 68588-0299, USA
| | - Cody M. Schultz
- Department of Chemistry, Hamilton Hall, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA
| | - Rebecca Y. Lai
- Department of Chemistry, Hamilton Hall, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA
| | - Peter A. Dowben
- Department of Physics and Astronomy, Theodore Jorgensen Hall, 855 North 16th Street, University of Nebraska-Lincoln, Lincoln, NE 68588-0299, USA
- Correspondence:
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10
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Thompson CC, Lai RY. Threonine Phosphorylation of an Electrochemical Peptide-Based Sensor to Achieve Improved Uranyl Ion Binding Affinity. Biosensors (Basel) 2022; 12:961. [PMID: 36354470 PMCID: PMC9688285 DOI: 10.3390/bios12110961] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 10/25/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
We have successfully designed a uranyl ion (U(VI)-specific peptide and used it in the fabrication of an electrochemical sensor. The 12-amino acid peptide sequence, (n) DKDGDGYIpTAAE (c), originates from calmodulin, a Ca(II)-binding protein, and contains a phosphothreonine that enhances the sequence's affinity for U(VI) over Ca(II). The sensing mechanism of this U(VI) sensor is similar to other electrochemical peptide-based sensors, which relies on the change in the flexibility of the peptide probe upon interacting with the target. The sensor was systematically characterized using alternating current voltammetry (ACV) and cyclic voltammetry. Its limit of detection was 50 nM, which is lower than the United States Environmental Protection Agency maximum contaminant level for uranium. The signal saturation time was ~40 min. In addition, it showed minimal cross-reactivity when tested against nine different metal ions, including Ca(II), Mg(II), Pb(II), Hg(II), Cu(II), Fe(II), Zn(II), Cd(II), and Cr(VI). Its reusability and ability to function in diluted aquifer and drinking water samples were further confirmed and validated. The response of the sensor fabricated with the same peptide sequence but with a nonphosphorylated threonine was also analyzed, substantiating the positive effects of threonine phosphorylation on U(VI) binding. This study places emphasis on strategic utilization of non-standard amino acids in the design of metal ion-chelating peptides, which will further diversify the types of peptide recognition elements available for metal ion sensing applications.
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11
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Gao Z, Wu G, Song Y, Li H, Zhang Y, Schneider MJ, Qiang Y, Kaszas J, Weng Z, Sun H, Huey BD, Lai RY, Zhang Y. Multiplexed Monitoring of Neurochemicals via Electrografting-Enabled Site-Selective Functionalization of Aptamers on Field-Effect Transistors. Anal Chem 2022; 94:8605-8617. [PMID: 35678711 DOI: 10.1021/acs.analchem.1c05531] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Neurochemical corelease has received much attention in understanding brain activity and cognition. Despite many attempts, the multiplexed monitoring of coreleased neurochemicals with spatiotemporal precision and minimal crosstalk using existing methods remains challenging. Here, we report a soft neural probe for multiplexed neurochemical monitoring via the electrografting-assisted site-selective functionalization of aptamers on graphene field-effect transistors (G-FETs). The neural probes possess excellent flexibility, ultralight mass (28 mg), and a nearly cellular-scale dimension of 50 μm × 50 μm for each G-FET. As a demonstration, we show that G-FETs with electrochemically grafted molecular linkers (-COOH or -NH2) and specific aptamers can be used to monitor serotonin and dopamine with high sensitivity (limit of detection: 10 pM) and selectivity (dopamine sensor >22-fold over norepinephrine; serotonin sensor >17-fold over dopamine). In addition, we demonstrate the feasibility of the simultaneous monitoring of dopamine and serotonin in a single neural probe with minimal crosstalk and interferences in phosphate-buffered saline, artificial cerebrospinal fluid, and harvested mouse brain tissues. The stability studies show that multiplexed neural probes maintain the capability for simultaneously monitoring dopamine and serotonin with minimal crosstalk after incubating in rat cerebrospinal fluid for 96 h, although a reduced sensor response at high concentrations is observed. Ex vivo studies in harvested mice brains suggest potential applications in monitoring the evoked release of dopamine and serotonin. The developed multiplexed detection methodology can also be adapted for monitoring other neurochemicals, such as metabolites and neuropeptides, by simply replacing the aptamers functionalized on the G-FETs.
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Affiliation(s)
- Zan Gao
- Department of Biomedical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Guangfu Wu
- Department of Biomedical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Yang Song
- Department of Biomedical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Huijie Li
- Department of Biomedical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Yuxuan Zhang
- Department of Biomedical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Michael J Schneider
- Department of Biomedical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Yingqi Qiang
- Department of Biomedical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Jackson Kaszas
- Department of Materials Science and Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Zhengyan Weng
- Department of Biomedical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - He Sun
- Department of Biomedical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Bryan D Huey
- Department of Materials Science and Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Rebecca Y Lai
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
| | - Yi Zhang
- Department of Biomedical Engineering and the Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
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12
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Zhang L, Cao C, Kaushik N, Lai RY, Liao J, Wang G, Ariotti N, Jin D, Stenzel MH. Controlling the Biological Behaviors of Polymer-Coated Upconverting Nanoparticles by Adjusting the Linker Length of Estrone Ligands. Biomacromolecules 2022; 23:2572-2585. [PMID: 35584062 DOI: 10.1021/acs.biomac.2c00265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The estrone ligand is used for modifying nanoparticle surfaces to improve their targeting effect on cancer cell lines. However, to date, there is no common agreement on the ideal linker length to be used for the optimum targeting performance. In this study, we aimed to investigate the impact of poly(poly ethylene glycol methyl ether methacrylate) (PPEGMEMA) linker length on the cellular uptake behavior of polymer-coated upconverting nanoparticles (UCNPs). Different triblock terpolymers, poly(poly (ethylene glycol) methyl ether methacrylate)-block-polymethacrylic acid-block-polyethylene glycol methacrylate phosphate (PPEGMEMAx-b-PMAAy-b-PEGMP3: x = 7, 15, 33, and 80; y = 16, 20, 18, and 18), were synthesized with different polymer linker chain lengths between the surface and the targeting ligand by reversible addition-fragmentation chain transfer polymerization. The estrone ligand was attached to the polymer via specific terminal conjugation. The cellular association of polymer-coated UCNPs with linker chain lengths was evaluated in MCF-7 cells by flow cytometry. Our results showed that the bioactivity of ligand modification is dependent on the length of the polymer linker. The shortest polymer PPEGMEMA7-b-PMAA16-b-PEGMP3 with estrone at the end of the polymer chain was found to have the best cellular association behavior in the estrogen receptor (ER)α-positive expression cell line MCF-7. Additionally, the anticancer drug doxorubicin•HCl was encapsulated in the nanocarrier to evaluate the 2D and 3D cytotoxicity. The results showed that estrone modification could efficiently improve the cellular uptake in ERα-positive expression cell lines and in 3D spheroid models.
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Affiliation(s)
- Lin Zhang
- Cluster for Advanced Macromolecular Design, School of Chemistry, University of New South Wales, Sydney 2052, New South Wales, Australia
| | - Cheng Cao
- Cluster for Advanced Macromolecular Design, School of Chemistry, University of New South Wales, Sydney 2052, New South Wales, Australia
| | - Natasha Kaushik
- Electron Microscope Unit, University of New South Wales, Sydney 2052, New South Wales, Australia
| | - Rebecca Y Lai
- Cluster for Advanced Macromolecular Design, School of Chemistry, University of New South Wales, Sydney 2052, New South Wales, Australia
| | - Jiayan Liao
- Institute for Biomedical Materials and Devices, Faculty of Science, University of Technology Sydney, Sydney 2006 New South Wales, Australia
| | - Guannan Wang
- Cluster for Advanced Macromolecular Design, School of Chemistry, University of New South Wales, Sydney 2052, New South Wales, Australia
| | - Nicholas Ariotti
- Electron Microscope Unit, University of New South Wales, Sydney 2052, New South Wales, Australia
| | - Dayong Jin
- Institute for Biomedical Materials and Devices, Faculty of Science, University of Technology Sydney, Sydney 2006 New South Wales, Australia
| | - Martina H Stenzel
- Cluster for Advanced Macromolecular Design, School of Chemistry, University of New South Wales, Sydney 2052, New South Wales, Australia
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13
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Ekanayaka TK, Kurz H, McElveen KA, Hao G, Mishra E, N'Diaye AT, Lai RY, Weber B, Dowben PA. Evidence for surface effects on the intermolecular interactions in Fe(II) spin crossover coordination polymers. Phys Chem Chem Phys 2022; 24:883-894. [PMID: 34908055 DOI: 10.1039/d1cp04243b] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
From X-ray absorption spectroscopy (XAS) and X-ray photoemission spectroscopy (XPS), it is evident that the spin state transition behavior of Fe(II) spin crossover coordination polymer crystallites at the surface differs from the bulk. A comparison of four different coordination polymers reveals that the observed surface properties may differ from bulk for a variety of reasons. There are Fe(II) spin crossover coordination polymers with either almost complete switching of the spin state at the surface or no switching at all. Oxidation, differences in surface packing, and changes in coordination could all contribute to making the surface very different from the bulk. Some Fe(II) spin crossover coordination polymers may be sufficiently photoactive so that X-ray spectroscopies cannot discern the spin state transition.
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Affiliation(s)
- Thilini K Ekanayaka
- Department of Physics and Astronomy, University of Nebraska, Jorgensen Hall, Lincoln, NE 68588-0299, USA.
| | - Hannah Kurz
- Inorganic Chemistry IV, University of Bayreuth, Universitätsstrasse 30, NW I, 95447 Bayreuth, Germany
| | - Kayleigh A McElveen
- Department of Chemistry, University of Nebraska, Hamilton Hall, Lincoln, NE 68588, USA
| | - Guanhua Hao
- Department of Physics and Astronomy, University of Nebraska, Jorgensen Hall, Lincoln, NE 68588-0299, USA. .,Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Esha Mishra
- Department of Physics and Astronomy, University of Nebraska, Jorgensen Hall, Lincoln, NE 68588-0299, USA.
| | - Alpha T N'Diaye
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Rebecca Y Lai
- Department of Chemistry, University of Nebraska, Hamilton Hall, Lincoln, NE 68588, USA.,Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Voetle-Keegan Nano Center, Lincoln, NE 68588, USA
| | - Birgit Weber
- Inorganic Chemistry IV, University of Bayreuth, Universitätsstrasse 30, NW I, 95447 Bayreuth, Germany
| | - Peter A Dowben
- Department of Physics and Astronomy, University of Nebraska, Jorgensen Hall, Lincoln, NE 68588-0299, USA.
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14
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Xu YD, Lai RY, Procházková E, Stenzel MH. Saturation Transfer Difference NMR Spectroscopy for the Elucidation of Supramolecular Albumin-Polymer Interactions. ACS Macro Lett 2021; 10:819-824. [PMID: 35549199 DOI: 10.1021/acsmacrolett.1c00270] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Albumin has consistently demonstrated its potential for enhancing the delivery of drugs and polymer-drug conjugates, binding via supramolecular forces within its multiple binding sites. Herein, we introduce saturation transfer difference (STD-NMR) as a method to identify the interactions between a polymer library and bovine serum albumin (BSA). With STD-NMR, the binding ability of polymers can be quickly screened by focusing on their individual structural features, making this technique more suitable for high throughput screening in comparison to traditional fluorescence studies.
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Affiliation(s)
- You D. Xu
- Centre for Advanced Macromolecular Design, School of Chemistry, The University of New South Wales, Sydney 2052, NSW, Australia
| | - Rebecca Y. Lai
- Centre for Advanced Macromolecular Design, School of Chemistry, The University of New South Wales, Sydney 2052, NSW, Australia
| | - Eliška Procházková
- Institute of Organic Chemistry and Biochemistry, The Czech Academy of Sciences, Prague 166 10, Czech Republic
| | - Martina H. Stenzel
- Centre for Advanced Macromolecular Design, School of Chemistry, The University of New South Wales, Sydney 2052, NSW, Australia
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15
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Fan L, Constantin L, Wu ZP, McElveen KA, Chen XG, He T, Wang F, Debiemme-Chouvy C, Cui B, Lai RY, Li X, Silvain JF, Lu YF. Laser vibrational excitation of radicals to prevent crystallinity degradation caused by boron doping in diamond. Sci Adv 2021; 7:7/4/eabc7547. [PMID: 33523921 PMCID: PMC7817095 DOI: 10.1126/sciadv.abc7547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 12/02/2020] [Indexed: 06/12/2023]
Abstract
Pursuing high-level doping without deteriorating crystallinity is prohibitively difficult but scientifically crucial to unleashing the hidden power of materials. This study demonstrates an effective route for maintaining lattice integrity during the combustion chemical vapor deposition of highly conductive boron-doped diamonds (BDDs) through laser vibrational excitation of a growth-critical radical, boron dihydride (BH2). The improved diamond crystallinity is attributed to a laser-enabled, thermal nonequilibrium suppression of the relative abundance of boron hydrides (BH), whose excessive presence induces boron segregation and disturbs the crystallization. The BDDs show a boron concentration of 4.3 × 1021 cm-3, a film resistivity of 28.1 milliohm·cm, and hole mobility of 55.6 cm2 V-1 s-1, outperforming a commercial BDD. The highly conductive and crystalline BDDs exhibit enhanced efficiency in sensing glucose, confirming the advantages of laser excitation in producing high-performance BDD sensors. Regaining crystallinity with laser excitation in doping process could remove the long-standing bottlenecks in semiconductor industry.
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Affiliation(s)
- L Fan
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - L Constantin
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
- The French National Centre for Scientific Research, CNRS, University of Bordeaux, Bordeaux INP, ICMCB UMR 5026, F-33608 Pessac, France
| | - Z P Wu
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - K A McElveen
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - X G Chen
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - T He
- Department of Civil and Environmental Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - F Wang
- Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - C Debiemme-Chouvy
- Laboratoire Interfaces et Systémes Electrochimiques, UMR 8235, CNRS, Sorbonne Université, F-75252 Paris Cedex, France
| | - B Cui
- Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - R Y Lai
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - X Li
- Department of Civil and Environmental Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
| | - J F Silvain
- The French National Centre for Scientific Research, CNRS, University of Bordeaux, Bordeaux INP, ICMCB UMR 5026, F-33608 Pessac, France
| | - Y F Lu
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
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16
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Zhou RH, Yu HQ, Liu JX, Xiao CL, Pan J, Lai RY, Li LL. [Effect of rational emotive therapy on negative emotion in advanced schistosomiasis patients with repeated hospitalization]. Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi 2020; 32:308-310. [PMID: 32468797 DOI: 10.16250/j.32.1374.2020098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
OBJECTIVE To examine the effect of rational emotive therapy on negative emotions among advanced schistosomiasis patients with repeated hospitalizations. METHODS A total of 97 advanced schistosomiasis patients with anxiety and depressive emotions that were hospitalized in Xiangyue Hospital of Hunan Institute of Schistosomiasis Control for three times or more were enrolled, and given rational emotive therapy for 4 weeks in addition to routine nursing care. The scores for anxiety, depression and quality of life were estimated in patients before and after the rational emotive therapy using the Self-Rating Anxiety Scale (SRS), the Self-Rating Depression Scale (SDS) and WHOQOL-BREF Form. RESULTS The SAS and SDS scores were significantly lower 4 weeks following rational emotive therapy than before the intervention (SAS score, 45.40 ± 7.77 vs. 59.25 ± 9.29, t = 14.021, P < 0.01; 51.48 ± 8.01 vs. 63.93 ± 9.59, t = 12.991, P < 0.01). The percentages of patients with moderate and severe anxiety and depression were significantly lower 4 weeks following rational emotive therapy than before the intervention (P < 0.01), and the scores for each item in the quality of life were all significantly greater 4 weeks following rational emotive therapy than before the intervention (P < 0.01). CONCLUSIONS Rational emotive therapy may improve the negative emotions and the quality of life of advanced schistosomiasis patients with repeated hospitalizations.
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Affiliation(s)
- R H Zhou
- Hunan Institute of Parasitic Diseases, WHO Collaborating Center on Schistosomiasis Control in Lake Regions, Hunan Key Laboratory of Immunology and Transmission Control of Schistosomiasis, National Key Clinical Specialty, Yueyang 414000, China
| | - H Q Yu
- Hunan Institute of Parasitic Diseases, WHO Collaborating Center on Schistosomiasis Control in Lake Regions, Hunan Key Laboratory of Immunology and Transmission Control of Schistosomiasis, National Key Clinical Specialty, Yueyang 414000, China
| | - J X Liu
- Hunan Institute of Parasitic Diseases, WHO Collaborating Center on Schistosomiasis Control in Lake Regions, Hunan Key Laboratory of Immunology and Transmission Control of Schistosomiasis, National Key Clinical Specialty, Yueyang 414000, China
| | - C L Xiao
- Hunan Institute of Parasitic Diseases, WHO Collaborating Center on Schistosomiasis Control in Lake Regions, Hunan Key Laboratory of Immunology and Transmission Control of Schistosomiasis, National Key Clinical Specialty, Yueyang 414000, China
| | - J Pan
- Hunan Institute of Parasitic Diseases, WHO Collaborating Center on Schistosomiasis Control in Lake Regions, Hunan Key Laboratory of Immunology and Transmission Control of Schistosomiasis, National Key Clinical Specialty, Yueyang 414000, China
| | - R Y Lai
- Hunan Institute of Parasitic Diseases, WHO Collaborating Center on Schistosomiasis Control in Lake Regions, Hunan Key Laboratory of Immunology and Transmission Control of Schistosomiasis, National Key Clinical Specialty, Yueyang 414000, China
| | - L L Li
- Hunan Institute of Parasitic Diseases, WHO Collaborating Center on Schistosomiasis Control in Lake Regions, Hunan Key Laboratory of Immunology and Transmission Control of Schistosomiasis, National Key Clinical Specialty, Yueyang 414000, China
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17
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Devi P, Hipp KN, Thakur A, Lai RY. Waste to wealth translation of e-waste to plasmonic nanostructures for surface-enhanced Raman scattering. Appl Nanosci 2020. [DOI: 10.1007/s13204-020-01273-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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18
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Li F, Yu Z, Han X, Lai RY. Electrochemical aptamer-based sensors for food and water analysis: A review. Anal Chim Acta 2018; 1051:1-23. [PMID: 30661605 DOI: 10.1016/j.aca.2018.10.058] [Citation(s) in RCA: 128] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 10/03/2018] [Accepted: 10/23/2018] [Indexed: 02/07/2023]
Abstract
Global food and water safety issues have prompted the development of highly sensitive, specific, and fast analytical techniques for food and water analysis. The electrochemical aptamer-based detection platform (E-aptasensor) is one of the more promising detection techniques because of its unique combination of advantages that renders these sensors ideal for detection of a wide range of target analytes. Recent research results have further demonstrated that this technique has potential for real world analysis of food and water contaminants. This review summaries the recently developed E-aptasensors for detection of analytes related to food and water safety, including bacteria, mycotoxins, algal toxins, viruses, drugs, pesticides, and metal ions. Ten different electroanalytical techniques and one opto-electroanalytical technique commonly employed with these sensors are also described. In addition to highlighting several novel sensor designs, this review also describes the strengths, limitations, and current challenges this technology faces, and future development trend.
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Affiliation(s)
- Fengqin Li
- Post-Doctoral Research Center of Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Fuling, Chongqing, 408100, China; College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin, 150040, China
| | - Zhigang Yu
- Post-Doctoral Research Center of Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Fuling, Chongqing, 408100, China; College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin, 150040, China.
| | - Xianda Han
- Post-Doctoral Research Center of Chongqing Key Laboratory of Inorganic Special Functional Materials, College of Chemistry and Chemical Engineering, Yangtze Normal University, Fuling, Chongqing, 408100, China; College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin, 150040, China
| | - Rebecca Y Lai
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, 68588-0304, United States.
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19
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Affiliation(s)
- Hamid R. Lotfi Zadeh Zhad
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, United States
| | - Rebecca Y. Lai
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, United States
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20
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Affiliation(s)
- Hamid R. Lotfi Zadeh Zhad
- Department of Chemistry, University of Nebraska—Lincoln, Lincoln, Nebraska 68588-0304, United States
| | - Rebecca Y. Lai
- Department of Chemistry, University of Nebraska—Lincoln, Lincoln, Nebraska 68588-0304, United States
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21
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Lotfi Zadeh Zhad HR, Rodríguez Torres YM, Lai RY. A reagentless and reusable electrochemical aptamer-based sensor for rapid detection of Cd(II). J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.09.022] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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22
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Affiliation(s)
| | - Rebecca Y. Lai
- Department of Chemistry; University of Nebraska-Lincoln; Lincoln NE 68588-0304
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23
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Abstract
We report the first electrochemical cisplatin sensor fabricated with a thiolated and methylene blue (MB)-modified oligo-adenine (A)-guanine (G) DNA probe. Depending on the probe coverage, the sensor can behave as a signal-off or signal-on sensor. For the high-coverage sensor, formation of intrastrand Pt(II)-AG adducts rigidifies the oligo-AG probe, resulting in a concentration-dependent decrease in the MB signal. For the low-coverage sensor, the increase in probe-to-probe spacing enables binding of cisplatin via the intrastrand GNG motif (N = A), generating a bend in the probe which results in an increase in the MB current. Although both high-coverage signal-off and low-coverage signal-on sensors are capable of detecting cisplatin, the signal-on sensing mechanism is better suited for real time analysis of cisplatin. The low-coverage sensor has a lower limit of detection, wider optimal AC frequency range, and faster response time. It has high specificity for cisplatin and potentially other Pt(II) drugs and does not cross-react with satraplatin, a Pt(IV) prodrug. It is also selective enough to be employed directly in 50% saliva and 50% urine. This detection strategy may offer a new approach for sensitive and real time analysis of cisplatin in clinical samples.
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Affiliation(s)
- Yao Wu
- Department of Chemistry, University of Nebraska-Lincoln , Lincoln, Nebraska 68588-0304, United States
| | - Rebecca Y Lai
- Department of Chemistry, University of Nebraska-Lincoln , Lincoln, Nebraska 68588-0304, United States
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24
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Affiliation(s)
- Yao Wu
- Department of Chemistry; University of Nebraska-Lincoln; Lincoln NE 68588-0304
| | - Savannah L. Baker
- Department of Chemistry; University of Nebraska-Lincoln; Lincoln NE 68588-0304
| | - Rebecca Y. Lai
- Department of Chemistry; University of Nebraska-Lincoln; Lincoln NE 68588-0304
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25
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Affiliation(s)
- Erin M. Gross
- Department of Chemistry; Creighton University; Omaha NE 68178 USA
| | - Hannah E. Durant
- Department of Chemistry; Creighton University; Omaha NE 68178 USA
| | - Kenneth N. Hipp
- Department of Chemistry; University of Nebraska-Lincoln; Lincoln NE 68588-0304 USA
| | - Rebecca Y. Lai
- Department of Chemistry; University of Nebraska-Lincoln; Lincoln NE 68588-0304 USA
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Abstract
A number of electrochemical DNA sensors based on the target-induced change in the conformation and/or flexibility of surface-bound oligonucleotides have been developed in recent years. These sensors, which are often termed E-DNA sensors, are comprised of an oligonucleotide probe modified with a redox label (e.g., methylene blue) at one terminus and attached to a gold electrode via a thiol-gold bond at the other. Binding of the target to the DNA probe changes its structure and dynamics, which, in turn, influences the efficiency of electron transfer to the interrogating electrode. Since electrochemically active contaminants are less common, these sensors are resistant to false-positive signals arising from the nonspecific adsorption of contaminants and perform well even when employed directly in serum, whole blood, and other realistically complex sample matrices. Moreover, because all of the sensor components are chemisorbed to the electrode, the E-DNA sensors are essentially label-free and readily reusable. To date, these sensors have achieved state-of-the-art sensitivity, while offering the unprecedented selectivity, reusability, and the operational convenience of direct electrochemical detection. This chapter reviews the recent advances in the development of both "signal-off" and "signal-on" E-DNA sensors. Critical aspects that dictate the stability and performance of these sensors are also addressed so as to provide a realistic overview of this oligonucleotide detection platform.
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Affiliation(s)
- Rebecca Y Lai
- University of Nebraska-Lincoln, Lincoln, NE, United States.
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Wu Y, Lai RY. A reagentless DNA-based electrochemical silver(I) sensor for real time detection of Ag(I) - the effect of probe sequence and orientation on sensor response. Biotechnol J 2016; 11:788-96. [PMID: 26901685 DOI: 10.1002/biot.201500428] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Revised: 12/11/2015] [Accepted: 02/16/2016] [Indexed: 11/09/2022]
Abstract
Ag(I) is known to interact with cytosine (C) via the formation C-Ag(I)-C complexes. The authors have utilized this concept to design six electrochemical Ag(I) sensors using C-rich DNA probes. Alternating current voltammetry and cyclic voltammetry were used to analyze the sensors. The results show that the dual-probe sensors that require the use of both 5'- and 3'-thiolated DNA probes are not suitable for this application, the differences in probe orientation impedes formation of C-Ag(I)-C complexes. Sensors fabricated with DNA probes containing both thymine (T) and C, independent of the location of the alkanethiol linker, do not response to Ag(I) either; T-T mismatches destabilize the duplex even in the presence of Ag(I). However, sensors fabricated with DNA probes containing both adenine (A) and C are ideal for this application, owing to the formation of C-Ag(I)-C complexes, as well as other lesser known interactions between A and Ag(I). Both sensors are sensitive, specific and selective enough to be used in 50% human saliva. They can also be used to detect silver sulfadiazine, a commonly prescribed antimicrobial drug. With further optimization, this sensing strategy may offer a promising approach for detection of Ag(I) in environmental and clinical samples.
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Affiliation(s)
- Yao Wu
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA
| | - Rebecca Y Lai
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, USA.
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Affiliation(s)
- Yao Wu
- University of Nebraska—Lincoln, 651 Hamilton
Hall, Lincoln, Nebraska 68588-0304, United States
| | - Rebecca Y. Lai
- University of Nebraska—Lincoln, 651 Hamilton
Hall, Lincoln, Nebraska 68588-0304, United States
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29
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Abstract
We report the design and fabrication of a reagentless and reusable electrochemical sensor for detection of satraplatin (SAT), a platinum(IV) prodrug. The detection strategy is based on the electrocatalytic reaction between the Pt(IV) center of SAT and surface-immobilized methylene blue. We systematically evaluated the effect of passivating diluent chain length on the overall sensor performance. Our results show that the use of a shorter diluent like 2-mercaptoethanol is more advantageous than using a longer and more passivating diluent such as 6-mercapto-1-hexanol. Independent of the use of cyclic voltammetry or chronoamperometry as the sensor interrogation technique, all three sensors, each passivated with a different alkanethiol diluent, have been demonstrated to be sensitive; the limit of detection is in the range of 1-10 μM. They are also highly specific and do not respond to Pt(II) drugs such as cisplatin and carboplatin. More importantly, they are selective enough to be employed directly in 50% serum. This sensing strategy has potential applications in clinical pharmacokinetics studies.
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Affiliation(s)
- Yao Wu
- 651 Hamilton Hall, University of Nebraska-Lincoln , Lincoln, Nebraska 68588-0304, United States
| | - Rebecca Y Lai
- 651 Hamilton Hall, University of Nebraska-Lincoln , Lincoln, Nebraska 68588-0304, United States
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Lotfi Zadeh Zhad HR, Lai RY. Comparison of nanostructured silver-modified silver and carbon ultramicroelectrodes for electrochemical detection of nitrate. Anal Chim Acta 2015; 892:153-9. [DOI: 10.1016/j.aca.2015.08.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 07/24/2015] [Accepted: 08/08/2015] [Indexed: 10/23/2022]
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31
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Zaitouna AJ, Maben AJ, Lai RY. Incorporation of extra amino acids in peptide recognition probe to improve specificity and selectivity of an electrochemical peptide-based sensor. Anal Chim Acta 2015; 886:157-64. [PMID: 26320648 DOI: 10.1016/j.aca.2015.05.037] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2015] [Revised: 05/17/2015] [Accepted: 05/18/2015] [Indexed: 10/23/2022]
Abstract
We investigated the effect of incorporating extra amino acids (AA) at the n-terminus of the thiolated and methylene blue-modified peptide probe on both specificity and selectivity of an electrochemical peptide-based (E-PB) HIV sensor. The addition of a flexible (SG)3 hexapeptide is, in particular, useful in improving sensor selectivity, whereas the addition of a highly hydrophilic (EK)3 hexapeptide has shown to be effective in enhancing sensor specificity. Overall, both E-PB sensors fabricated using peptide probes with the added AA (SG-EAA and EK-EAA) showed better specificity and selectivity, especially when compared to the sensor fabricated using a peptide probe without the extra AA (EAA). For example, the selectivity factor recorded in the 50% saliva was ∼2.5 for the EAA sensor, whereas the selectivity factor was 7.8 for both the SG-EAA and EK-EAA sensors. Other sensor properties such as the limit of detection and dynamic range were minimally affected by the addition of the six AA sequence. The limit of detection was 0.5 nM for the EAA sensor and 1 nM for both SG-EAA and EK-EAA sensors. The saturation target concentration was ∼200 nM for all three sensors. Unlike previously reported E-PB HIV sensors, the peptide probe functions as both the recognition element and antifouling passivating agent; this modification eliminates the need to include an additional antifouling diluent, which simplifies the sensor design and fabrication protocol.
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Affiliation(s)
- Anita J Zaitouna
- University of Nebraska-Lincoln, 651 Hamilton Hall, Lincoln, NE 68588-0304, USA
| | - Alex J Maben
- University of Nebraska-Lincoln, 651 Hamilton Hall, Lincoln, NE 68588-0304, USA
| | - Rebecca Y Lai
- University of Nebraska-Lincoln, 651 Hamilton Hall, Lincoln, NE 68588-0304, USA.
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Zaitouna AJ, Joyce J, Cerny RL, Dussault PH, Lai RY. Comparison of Mannose, Ethylene Glycol, and Methoxy-Terminated Diluents on Specificity and Selectivity of Electrochemical Peptide-Based Sensors. Anal Chem 2015; 87:6966-73. [PMID: 26057465 DOI: 10.1021/acs.analchem.5b01759] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the synthesis and application of three new antifouling diluents for the fabrication of an E-PB HIV sensor. Among the three thiolated antifouling diluents used in this study, the methoxy-terminated diluent (C6-MEG) is the most effective in alleviating both nonspecific binding and adsorption of matrix contaminants onto the sensor surface, especially when compared to the mannose- (C6-MAN) and ethylene-glycol-terminated (C6-EG) diluents. The sensor fabricated with C6-MEG has a specificity factor (∼13.5) substantially higher than the sensor passivated with only 6-mercapto-1-hexanol (∼1.5). It is functional even when employed directly in 25% serum, an achievement that has not been observed with this class of E-PB sensors. More importantly, incorporation of these antifouling diluents has negligible impact on other important sensor properties such as sensitivity and binding kinetics. This sensor passivation strategy is versatile and can potentially be used with other E-PB sensors, as well as surface-based sensors that utilize thiol-gold self-assembled monolayer chemistry.
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Affiliation(s)
- Anita J Zaitouna
- †Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, United States
| | - Jesse Joyce
- †Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, United States
| | - Ronald L Cerny
- †Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, United States
| | - Patrick H Dussault
- †Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, United States
| | - Rebecca Y Lai
- †Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, United States
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McQuistan A, Zaitouna AJ, Echeverria E, Lai RY. Use of thiolated oligonucleotides as anti-fouling diluents in electrochemical peptide-based sensors. Chem Commun (Camb) 2015; 50:4690-2. [PMID: 24668223 DOI: 10.1039/c4cc01290a] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We incorporated short thiolated oligonucleotides as passivating diluents in the fabrication of electrochemical peptide-based (E-PB) sensors, with the goal of creating a negatively charged layer capable of resisting non-specific adsorption of matrix contaminants. The E-PB HIV sensors fabricated using these diluents were found to be more specific and selective, while retaining attributes similar to the sensor fabricated without these diluents. Overall, these results highlight the advantages of using oligonucleotides as anti-fouling diluents in self-assembled monolayer-based sensors.
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Affiliation(s)
- Adam McQuistan
- Department of Chemistry, Hamilton Hall, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA.
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Abstract
We report, for the first time, the design and fabrication of an electrochemical ion (E-ION) sensor for highly specific detection of hexavalent chromium (Cr(VI)). Unlike previously developed electrochemical Cr(VI) sensors, the sensing mechanism relies on the previously unexplored electrocatalytic reaction between Cr(VI) and surface-immobilized methylene blue (MB). The sensor is sensitive, specific, and selective enough to be used in a synthetic aquifer sample. Like many sensors of this class, it is also reagentless, reusable, and compatible with gold-plated screen-printed carbon electrodes. Despite the difference in the sensing mechanism, this E-ION Cr(VI) sensor possesses attributes similar to other MB-based electrochemical sensors, sensors with potential for real world applications.
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Affiliation(s)
- Lee E Korshoj
- Department of Chemistry, University of Nebraska-Lincoln , Lincoln, Nebraska 68588-0304, United States
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Salamifar SE, Lee S, Lai RY. Electrochemical hydrogen peroxide sensors fabricated using cytochrome c immobilized on macroelectrodes and ultramicroelectrodes. Colloids Surf B Biointerfaces 2014; 123:866-9. [DOI: 10.1016/j.colsurfb.2014.10.033] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2014] [Revised: 10/04/2014] [Accepted: 10/15/2014] [Indexed: 10/24/2022]
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36
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Salamifar SE, Lai RY. Application of electrochemical surface plasmon resonance spectroscopy for characterization of electrochemical DNA sensors. Colloids Surf B Biointerfaces 2014; 122:835-839. [DOI: 10.1016/j.colsurfb.2014.07.028] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 07/05/2014] [Accepted: 07/16/2014] [Indexed: 11/25/2022]
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37
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Affiliation(s)
- Yao Wu
- 651 Hamilton Hall, University of Nebraska—Lincoln, Lincoln, Nebraska 68588-0304, United States
| | - Rebecca Y. Lai
- 651 Hamilton Hall, University of Nebraska—Lincoln, Lincoln, Nebraska 68588-0304, United States
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38
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Affiliation(s)
- S. Ehsan Salamifar
- Department
of Chemistry, University of Nebraska−Lincoln, Lincoln, NE 68588-0304, United States
| | - Rebecca Y. Lai
- Department
of Chemistry, University of Nebraska−Lincoln, Lincoln, NE 68588-0304, United States
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39
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Yu ZG, Zaitouna AJ, Lai RY. Effect of redox label tether length and flexibility on sensor performance of displacement-based electrochemical DNA sensors. Anal Chim Acta 2014; 812:176-83. [DOI: 10.1016/j.aca.2013.12.040] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Revised: 12/19/2013] [Accepted: 12/28/2013] [Indexed: 10/25/2022]
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Salamifar SE, Lai RY. Use of combined scanning electrochemical and fluorescence microscopy for detection of reactive oxygen species in prostate cancer cells. Anal Chem 2013; 85:9417-21. [PMID: 24044675 DOI: 10.1021/ac402367f] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Release of ROS from prostate cancer (PC3) cells was studied using scanning electrochemical microscopy (SECM) and fluorescence microscopy. One-directional lateral scan SECM was used as a rapid and reproducible tool for simultaneous mapping of cell topography and reactive oxygen species (ROS) release. Fluorescence microscopy was used in tandem to monitor the tip position, in addition to providing information on intracellular ROS content via the use of ROS-reactive fluorescent dyes. A unique tip current (iT) vs lateral distance profile was observed when the tip potential (ET) was set at -0.65 V. This profile reflects the combined effects of topographical change and ROS release at the PC3 cell surfaces. Differentiation between topographical-related and ROS-induced current change was achieved by comparing the scans collected at -0.65 and -0.85 V. The effects of other parameters such as tip to cell distance, solvent oxygen content, and scan direction on the profile of the scan were systematically evaluated. Cells treated with tert-butyl hydroperoxide, a known ROS stimulus, were also evaluated using the lateral scanning approach. Overall, the SECM results correlate well with the fluorescence results. The extracellular ROS level detected at the SECM tip was found to be similar to the intracellular ROS level monitored using fluorescence microscopy. While the concentration of each contributing ROS species has not been determined and is thus part of the future study, here we have successfully demonstrated the use of a simple two-potential lateral scan approach for analysis of ROS released by living cells under real physiological conditions.
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Affiliation(s)
- S Ehsan Salamifar
- Department of Chemistry, University of Nebraska-Lincoln , Lincoln, Nebraska 68588-0304, United States
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42
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Wu Y, Lai RY. Development of a "signal-on" electrochemical DNA sensor with an oligo-thymine spacer for point mutation detection. Chem Commun (Camb) 2013; 49:3422-4. [PMID: 23503676 DOI: 10.1039/c3cc41281d] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We report a reagentless and reusable "signal-on" electrochemical DNA sensor that utilizes oligo-thymine as a flexible spacer. This sensor design is sensitive, specific, and selective; it is potentially generalizable for detection of a wide range of biomedical-relevant nucleic acid sequences.
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Affiliation(s)
- Yao Wu
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
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43
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Zammit CM, Quaranta D, Gibson S, Zaitouna AJ, Ta C, Brugger J, Lai RY, Grass G, Reith F. A whole-cell biosensor for the detection of gold. PLoS One 2013; 8:e69292. [PMID: 23950889 PMCID: PMC3739760 DOI: 10.1371/journal.pone.0069292] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2011] [Accepted: 06/12/2013] [Indexed: 11/18/2022] Open
Abstract
Geochemical exploration for gold (Au) is becoming increasingly important to the mining industry. Current processes for Au analyses require sampling materials to be taken from often remote localities. Samples are then transported to a laboratory equipped with suitable analytical facilities, such as Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) or Instrumental Neutron Activation Analysis (INAA). Determining the concentration of Au in samples may take several weeks, leading to long delays in exploration campaigns. Hence, a method for the on-site analysis of Au, such as a biosensor, will greatly benefit the exploration industry. The golTSB genes from Salmonella enterica serovar typhimurium are selectively induced by Au(I/III)-complexes. In the present study, the golTSB operon with a reporter gene, lacZ, was introduced into Escherichia coli. The induction of golTSB::lacZ with Au(I/III)-complexes was tested using a colorimetric β-galactosidase and an electrochemical assay. Measurements of the β-galactosidase activity for concentrations of both Au(I)- and Au(III)-complexes ranging from 0.1 to 5 µM (equivalent to 20 to 1000 ng g(-1) or parts-per-billion (ppb)) were accurately quantified. When testing the ability of the biosensor to detect Au(I/III)-complexes(aq) in the presence of other metal ions (Ag(I), Cu(II), Fe(III), Ni(II), Co(II), Zn, As(III), Pb(II), Sb(III) or Bi(III)), cross-reactivity was observed, i.e. the amount of Au measured was either under- or over-estimated. To assess if the biosensor would work with natural samples, soils with different physiochemical properties were spiked with Au-complexes. Subsequently, a selective extraction using 1 M thiosulfate was applied to extract the Au. The results showed that Au could be measured in these extracts with the same accuracy as ICP-MS (P<0.05). This demonstrates that by combining selective extraction with the biosensor system the concentration of Au can be accurately measured, down to a quantification limit of 20 ppb (0.1 µM) and a detection limit of 2 ppb (0.01 µM).
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Affiliation(s)
- Carla M. Zammit
- The University of Adelaide, School of Earth and Environmental Sciences, Centre of Tectonics, Resources and Exploration (TRaX), Adelaide, South Australia, Australia
- The Commonwealth Scientific and Industrial Research Organisation (CSIRO) Land and Water, Environmental Biogeochemistry, PMB2, Glen Osmond, South Australia, Australia
- * E-mail: (CMZ); (FR)
| | - Davide Quaranta
- The University of Nebraska-Lincoln, School of Biological Sciences, Lincoln, Nebraska, United States of America
| | - Shane Gibson
- The University of Nebraska-Lincoln, School of Biological Sciences, Lincoln, Nebraska, United States of America
| | - Anita J. Zaitouna
- The University of Nebraska-Lincoln, Department of Chemistry, Lincoln, Nebraska, United States of America
| | - Christine Ta
- Flinders University, School of Chemical and Physical Sciences, Adelaide, South Australia, Australia
| | - Joël Brugger
- The University of Adelaide, School of Earth and Environmental Sciences, Centre of Tectonics, Resources and Exploration (TRaX), Adelaide, South Australia, Australia
- Mineralogy, South Australian Museum, Adelaide, South Australia, Australia
| | - Rebecca Y. Lai
- The University of Nebraska-Lincoln, Department of Chemistry, Lincoln, Nebraska, United States of America
| | - Gregor Grass
- The University of Nebraska-Lincoln, School of Biological Sciences, Lincoln, Nebraska, United States of America
- Bundeswehr Institute of Microbiology, Munich, Germany
| | - Frank Reith
- The University of Adelaide, School of Earth and Environmental Sciences, Centre of Tectonics, Resources and Exploration (TRaX), Adelaide, South Australia, Australia
- The Commonwealth Scientific and Industrial Research Organisation (CSIRO) Land and Water, Environmental Biogeochemistry, PMB2, Glen Osmond, South Australia, Australia
- * E-mail: (CMZ); (FR)
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Lai RY, Walker B, Stormberg K, Zaitouna AJ, Yang W. Electrochemical techniques for characterization of stem-loop probe and linear probe-based DNA sensors. Methods 2013; 64:267-75. [PMID: 23933234 DOI: 10.1016/j.ymeth.2013.07.041] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Revised: 07/29/2013] [Accepted: 07/31/2013] [Indexed: 10/26/2022] Open
Abstract
Here we present a summary of the sensor performance of the stem-loop probe (SLP) and linear probe (LP) electrochemical DNA sensors when interrogated using alternating current voltammetry (ACV), cyclic voltammetry (CV), and differential pulse voltammetry (DPV). Specifically, we identified one critical parameter for each voltammetric technique that can be adjusted for optimal sensor performance. Overall, the SLP sensor displayed good sensor performance (i.e., 60+% signal attenuation in the presence of the target) over a wider range of experimental conditions when compared to the LP sensor. When used with ACV, the optimal frequency range was found to be between 5 and 5000 Hz, larger than the 5-100 Hz range observed with the LP sensor. A similar trend was observed for the two sensors in CV; the LP sensor was operational only at scan rates between 30 and 100 V/s, whereas the SLP sensor performed well at scan rates between 1 and 1000 V/s. Unlike ACV and CV, DPV has demonstrated to be a more versatile sensor interrogation technique for this class of sensors. Despite the minor differences in total signal attenuation upon hybridization to the target DNA, both SLP and LP sensors performed optimally under most pulse widths used in this study. More importantly, when used with longer pulse widths, both sensors showed "signal-on" behavior, which is generally more desirable for sensor applications.
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Affiliation(s)
- Rebecca Y Lai
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA.
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Fisher TJ, Cañete SJP, Lai RY, Dussault PH. Design and Synthesis of a New Class of Twin-Chain Amphiphiles for Self-Assembled Monolayer-based Electrochemical Biosensor Applications. European J Org Chem 2013; 2013:3263-3270. [PMID: 24431984 PMCID: PMC3888879 DOI: 10.1002/ejoc.201201732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Indexed: 11/08/2022]
Abstract
A new class of twin-chain hydroxyalkylthiols (mercaptoalkanols) featuring a nearly constant cross-section and the potential for modification of one or both termini are available with complete regioselectivity through Pd-mediated couplings of benzene diiododitriflate, including an example of a previously unreported coupling to generate an ortho-substituted arene bis acetic acid. Self-assembled monolayers (SAMs) prepared from the new amphiphiles demonstrate improved stability in an electrochemical sensor system compared with monolayers prepared from analogous single chain thiols.
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Affiliation(s)
- Thomas J. Fisher
- Department of Chemistry and Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln, Lincoln, NE 68588
| | - Socrates Jose P. Cañete
- Department of Chemistry and Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln, Lincoln, NE 68588
| | - Rebecca Y. Lai
- Department of Chemistry and Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln, Lincoln, NE 68588
| | - Patrick H. Dussault
- Department of Chemistry and Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln, Lincoln, NE 68588
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Abstract
Here we report the effect of the signaling probe conformation on sensor performance of a "signal-on" folding-based electrochemical DNA sensor. The sensor is comprised of a methylene blue (MB)-modified signaling probe and an unlabeled capture probe that partially hybridize to each other at the distal end. In presence of the full-complement target which binds to the unlabeled capture probe, the labeled signaling probe is released. Two different signaling probes were used in this study, in which one is capable of assuming a stem-loop conformation (SLP-MB), whereas the other probe adopts a flexible linear conformation (LP-MB). In the presence of the full complement target DNA, both sensors showed a large increase in MB current when interrogated using alternating current (ac) voltammetry, verifying the release of the signaling probe. Overall, the SLP-MB sensor showed higher % signal enhancement; the LP-MB sensor, however, showed distinctly faster binding kinetics when interrogated under the same experimental conditions. The SLP-MB sensor displayed a wider usable ac frequency range when compared to the LP-MB sensor. Despite these differences, the detection limit and dynamic range were found to be similar among the two sensors. In addition to 6-mercapto-1-hexanol, longer chain hydroxyl-terminated alkanethiols were used to construct these sensors. Our results showed that sensors fabricated with longer chain diluents, independent of the sensor architecture, were not only functional, the signaling capability was significantly enhanced.
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Affiliation(s)
- Zhi-gang Yu
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province, College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin, P R China
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Ostenfeld T, Krishen A, Lai RY, Bullman J, Baines AJ, Green J, Anand P, Kelly M. Analgesic efficacy and safety of the novel p38 MAP kinase inhibitor, losmapimod, in patients with neuropathic pain following peripheral nerve injury: a double-blind, placebo-controlled study. Eur J Pain 2012; 17:844-57. [PMID: 23239139 DOI: 10.1002/j.1532-2149.2012.00256.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/06/2012] [Indexed: 12/30/2022]
Abstract
BACKGROUND Inhibitors of p38 mitogen-activated protein kinase are undergoing evaluation as a novel class of anti-rheumatic drugs, by virtue of their ability to suppress the production of pro-inflammatory cytokines. Emerging data suggests that they may also attenuate peripheral or central sensitization in neuropathic pain. A double-blind, placebo-controlled study was undertaken to evaluate the analgesic efficacy of losmapimod (GW856553), a novel p38α/β inhibitor, in subjects with neuropathic pain following traumatic peripheral nerve injury. METHODS One hundred and sixty-eight subjects with pain of at least moderate intensity (average daily score ≥4 on an 11-point pain intensity numeric rating scale; PI-NRS) at baseline were randomized to receive oral losmapimod, 7.5 mg BID or placebo for 28 days. Efficacy and safety assessments were undertaken at weekly clinic visits. RESULTS The mean treatment difference for the change in average daily pain score from baseline to week 4 of treatment based on the PI-NRS was -0.22 (95% CI -0.73, 0.28) in favour of losmapimod over placebo (p = 0.39). There were no statistically significant or clinically meaningful differences between the treatment groups over the 4-week dosing period for either the primary or secondary efficacy variables. There were no unexpected safety or tolerability findings following dosing with losmapimod. CONCLUSIONS Losmapimod could not be differentiated from placebo in terms of a primary analgesia response in patients with pain following peripheral nerve injury. The lack of response could reflect inadequate exposure at central sites of action or differences between rodent and human with respect to the target or neuropathic pain mechanisms.
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Affiliation(s)
- T Ostenfeld
- Neurosciences Discovery Medicine Unit, GlaxoSmithKline R&D, Harlow, UK.
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Gerasimov JY, Schaefer CS, Yang W, Grout RL, Lai RY. Development of an electrochemical insulin sensor based on the insulin-linked polymorphic region. Biosens Bioelectron 2012. [PMID: 23202332 DOI: 10.1016/j.bios.2012.10.046] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Here we report the design and fabrication of an electrochemical aptamer-based (E-AB) sensor for detection of insulin. The aptamer used in this study is the insulin-linked polymorphic region (ILPR) sequence, a G-rich sequence that presumably undergoes ligand-induced folding to form a G-quadruplex in presence of insulin. Our circular dichroism data, however, suggests that the ILPR sequence, even in absence of the target, is predominantly in a G-quadruplex-like form. Insulin binding, however, has shown to further induce the formation of the G-quadruplex. To evaluate the potential of the ILPR sequence as a biosensing element, we constructed two E-AB insulin sensors that are identical in all aspects but the location of the methylene blue (MB) redox label. We find that the sensor fabricated with internal MB-modified probes (In-IT) shows enhanced sensing behavior when compared to one fabricated using terminal-MB modified probes (In1). The improvements observed with the In-IT sensor could be attributed to the more effective obstruction of electron transfer upon insulin binding. Overall, both sensors perform well, affording a detection limit of 10 nM and 50 nM for the In-IT and In1 sensors, respectively.
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Affiliation(s)
- Jennifer Y Gerasimov
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE 68588-0304, USA
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Yang W, Lai RY. A dual-signalling electrochemical DNA sensor based on target hybridization-induced change in DNA probe flexibility. Chem Commun (Camb) 2012; 48:8703-5. [DOI: 10.1039/c2cc34312f] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yu ZG, Lai RY. A reagentless and reusable electrochemical DNA sensor based on target hybridization-induced stem-loop probe formation. Chem Commun (Camb) 2012; 48:10523-5. [DOI: 10.1039/c2cc35985e] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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