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Photodegradation of Azathioprine in the Presence of Sodium Thiosulfate. Int J Mol Sci 2022; 23:ijms23073975. [PMID: 35409337 PMCID: PMC8999472 DOI: 10.3390/ijms23073975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 03/24/2022] [Accepted: 03/31/2022] [Indexed: 11/17/2022] Open
Abstract
The effect of sodium thiosulfate (ST) on the photodegradation of azathioprine (AZA) was analyzed by UV-VIS spectroscopy, photoluminescence (PL), FTIR spectroscopy, Raman scattering, X-ray photoelectron (XPS) spectroscopy, thermogravimetry (TG) and mass spectrometry (MS). The PL studies highlighted that as the ST concentration increased from 25 wt.% to 75 wt.% in the AZA:ST mixture, the emission band of AZA gradual downshifted to 553, 542 and 530 nm. The photodegradation process of AZA:ST induced: (i) the emergence of a new band in the 320–400 nm range in the UV-VIS spectra of AZA and (ii) a change in the intensity ratio of the photoluminescence excitation (PLE) bands in the 280–335 and 335–430 nm spectral ranges. These changes suggest the emergence of new compounds during the photo-oxidation reaction of AZA with ST. The invoked photodegradation compounds were confirmed by studies of the Raman scattering, the FTIR spectroscopy and XPS spectroscopy through: (i) the downshift of the IR band of AZA from 1336 cm−1 to 1331 cm−1, attributed to N-C-N deformation in the purine ring; (ii) the change in the intensity ratio of the Raman lines peaking at 1305 cm−1 and 1330 cm−1 from 3.45 to 4.57, as the weight of ST in the AZA:ST mixture mass increased; and (iii) the emergence of a new band in the XPS O1s spectrum peaking at 531 eV, which was associated with the C=O bond. Through correlated studies of TG-MS, the main key fragments of ST-reacted AZA are reported.
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Kumar Mall V, Prakash Ojha R, Tiwari P, Prakash R. Immunosuppressive Drug Sensor based on MoS2-Polycarboxyindole Modified Electrodes. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Alizadeh T, Shojaeianfar M, Reza Ganjali M. Preparation of a New Copper/Mercury‐Based Amalgam Electrode with Minimal Mercury Content and Its Application for the Determination of Azathioprine in Biological Fluids. ChemistrySelect 2021. [DOI: 10.1002/slct.202000546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Taher Alizadeh
- Department of Analytical Chemistry, Faculty of Chemistry University College of Science, University of Tehran Tehran, Iran, P.O. Box 14155-6455 Tehran Iran
| | - Moslem Shojaeianfar
- Department of Analytical Chemistry, Faculty of Chemistry University College of Science, University of Tehran Tehran, Iran, P.O. Box 14155-6455 Tehran Iran
| | - Mohammad Reza Ganjali
- Department of Analytical Chemistry, Faculty of Chemistry University College of Science, University of Tehran Tehran, Iran, P.O. Box 14155-6455 Tehran Iran
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Topal BD, Sener CE, Kaya B, Ozkan SA. Nano-sized Metal and Metal Oxide Modified Electrodes for Pharmaceuticals Analysis. CURR PHARM ANAL 2021. [DOI: 10.2174/1573412916999200513110313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
:
The electrochemical analysis offers a number of important advantages such as providing
information on pharmaceuticals analysis and their in vivo redox processes and pharmacological activity.
The interest in developing electrochemical sensing devices for use in clinical assays is growing rapidly.
Metallic nanoparticles can be synthesized and modified with various chemical functional groups,
which allow them to be conjugated with antibodies, ligands, and drugs of interest.
:
In this article, the novel developments to enhance the performance of sensor modified with metal nanoparticles
of pharmaceuticals were reviewed. A discussion of the properties of metal nanostructures
and their application in drug analysis is presented. Their application as a modifier agent in determining
low levels of drugs in pharmaceutical dosage forms and biological samples is discussed. It has been
found that the electrocatalytic effect of the electrode, sensitivity and selectivity were increased using
various working electrodes modified with nano-sized metal, metal oxide and metal/metal oxide
particles.
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Affiliation(s)
- Burcu Dogan Topal
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, 06100, Tandogan, Ankara,Turkey
| | - Ceren Elif Sener
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, 06100, Tandogan, Ankara,Turkey
| | - Basak Kaya
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, 06100, Tandogan, Ankara,Turkey
| | - Sibel Aysıl Ozkan
- Department of Analytical Chemistry, Faculty of Pharmacy, Ankara University, 06100, Tandogan, Ankara,Turkey
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KoÇak ÇC, Süleyman K, KarabİberoĞlu Ş, Dursun Z. Highly improved electrocatalytic oxidation of dimethylamine borane on silver nanoparticles modified polymer composite electrode. Turk J Chem 2021; 44:125-141. [PMID: 33488148 PMCID: PMC7751808 DOI: 10.3906/kim-1906-23] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Accepted: 11/04/2020] [Indexed: 11/06/2022] Open
Abstract
Dimethylamine borane (DMAB) is a promising fuel alternative for fuel cell applications. In this work cyclic voltammetric behavior of DMAB was investigated on the polymerized aminophenol film decorated with Ag nanoparticles in alkaline media. The polymer film was formed on the glassy carbon electrode by electrochemical technique and then, the surface was modified with Ag nanoparticles. The surface of the modified electrode was identified by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and electrochemical impedance spectroscopy techniques. The developed electrode has displayed high electrocatalytic activity for DMAB oxidation in alkaline media depending on the supporting electrolyte concentration. Experimental parameters such as cycle number used in electropolymerization of p-aminophenol, deposition of Ag nanoparticles and supporting electrolyte were optimized.
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Affiliation(s)
| | - KoÇak Süleyman
- Department of Chemistry, Faculty of Science and Letters, Manisa Celal Bayar University, Manisa Turkey
| | | | - Zekerya Dursun
- Department of Chemistry, Faculty of Science, Ege University, İzmir Turkey
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Orts-Arroyo M, Castro I, Martínez-Lillo J. Detection of Hypoxanthine from Inosine and Unusual Hydrolysis of Immunosuppressive Drug Azathioprine through the Formation of a Diruthenium(III) System. BIOSENSORS 2021; 11:19. [PMID: 33440852 PMCID: PMC7827764 DOI: 10.3390/bios11010019] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 12/27/2020] [Accepted: 01/06/2021] [Indexed: 12/30/2022]
Abstract
Hypoxanthine (hpx) is an important molecule for both biochemistry research and biomedical applications. It is involved in several biological processes associated to energy and purine metabolism and has been proposed as a biomarker for a variety of disease states. Consequently, the discovery and development of systems suitable for the detection of hypoxanthine is pretty appealing in this research field. Thus, we have obtained a stable diruthenium (III) compound in its dehydrated and hydrated forms with formula [{Ru(µ-Cl)(µ-hpx)}2Cl4] (1a) and [{Ru(µ-Cl)(µ-hpx)}2Cl4]·2H2O (1b), respectively. This purine-based diruthenium(III) system was prepared from two very different starting materials, namely, inosine and azathioprine, the latter being an immunosuppressive drug. Remarkably, it was observed that an unusual azathioprine hydrolysis occurs in the presence of ruthenium, thus generating hypoxanthine instead of the expected 6-mercaptopurine antimetabolite, so that the hpx molecule is linked to two ruthenium(III) ions. 1a and 1b were characterized through IR, SEM, powder and single-crystal X-ray Diffraction and Cyclic Voltammetry (CV). The electrochemical studies allowed us to detect the hpx molecule when coordinated to ruthenium in the reported compound. The grade of sensitivity, repeatability and stability reached by this diruthenium system make it potentially useful and could provide a first step to develop new sensor devices suitable to detect hypoxanthine.
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Affiliation(s)
| | | | - José Martínez-Lillo
- Instituto de Ciencia Molecular (ICMol), Universitat de València, c/ Catedrático José Beltrán 2, Paterna, 46980 València, Spain; (M.O.-A.); (I.C.)
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Selvi SV, Nataraj N, Chen SM, Prasannan A. An electrochemical platform for the selective detection of azathioprine utilizing a screen-printed carbon electrode modified with manganese oxide/reduced graphene oxide. NEW J CHEM 2021. [DOI: 10.1039/d0nj05592a] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Scheme representing the electro-reduction of AZT at Mn2O3–rGO/SPCE.
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Affiliation(s)
- Subash Vetri Selvi
- Electroanalysis and Bioelectrochemistry Lab
- Department of Chemical Engineering and Biotechnology
- National Taipei University of Technology
- Taipei 106
- Republic of China
| | - Nandini Nataraj
- Electroanalysis and Bioelectrochemistry Lab
- Department of Chemical Engineering and Biotechnology
- National Taipei University of Technology
- Taipei 106
- Republic of China
| | - Shen-Ming Chen
- Electroanalysis and Bioelectrochemistry Lab
- Department of Chemical Engineering and Biotechnology
- National Taipei University of Technology
- Taipei 106
- Republic of China
| | - Adhimoorthy Prasannan
- Department of Materials Science and Engineering
- National Taiwan University of Science and Technology
- Taipei 10607
- Republic of China
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Mohammad Almahri A, Jabli M. Successful spectrofluorometric and chemiluminescence methods for the estimation of azathioprine as an immunosuppressive drug in pharmaceutical preparation. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2020.10.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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9
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Rizk M, Attia AK, Mohamed HY, Elshahed MS. Validated Voltammetric Method for the Simultaneous Determination of Anti‐diabetic Drugs, Linagliptin and Empagliflozin in Bulk, Pharmaceutical Dosage Forms and Biological Fluids. ELECTROANAL 2020. [DOI: 10.1002/elan.202000007] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mohamed Rizk
- Department of Analytical Chemistry, Faculty of PharmacyHelwan University, EinHelwan 11795 Cairo Egypt
| | - Ali K. Attia
- National Organization for Drug Control and Research (NODCAR) P.O. Box 29 Giza Egypt
- Chemistry Department, College of Sciences Al-ZulfiMajmaah University AL-Majmaah 11952 Saudi Arabia
| | - Heba Y. Mohamed
- National Organization for Drug Control and Research (NODCAR) P.O. Box 29 Giza Egypt
| | - Mona S. Elshahed
- Department of Analytical Chemistry, Faculty of PharmacyHelwan University, EinHelwan 11795 Cairo Egypt
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Brusač E, Jeličić ML, Amidžić Klarić D, Nigović B, Turk N, Klarić I, Mornar A. Pharmacokinetic Profiling and Simultaneous Determination of Thiopurine Immunosuppressants and Folic Acid by Chromatographic Methods. MOLECULES (BASEL, SWITZERLAND) 2019; 24:molecules24193469. [PMID: 31554326 PMCID: PMC6803969 DOI: 10.3390/molecules24193469] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 09/20/2019] [Accepted: 09/22/2019] [Indexed: 12/18/2022]
Abstract
With the increase in the number of medicines patients have to take, there has been a rapid rise of fixed-dose combinations (FDCs) in the last two decades. Prior to FDC development, pharmacokinetic properties of active pharmaceutical ingredients (APIs) have to be evaluated, as well as methods for their determination developed. So as to increase patient compliance in inflammatory bowel disease, three novel FDCs of thiopurine immunosuppressants and folic acid are proposed; physico-chemical and pharmacokinetic properties such as hydrophobicity, lipophilicity and plasma protein binding of all APIs are evaluated. Moreover, experimental results of different properties are compared to those computed by various on-line prediction platforms so as to evaluate the viability of the in silico approach. A simultaneous method for their determination is developed, optimized, validated and applied to commercial tablet formulations. The method has shown to be fast, selective, accurate and precise, showing potential for reliable determination of API content in proposed FDCs during its development.
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Affiliation(s)
- Edvin Brusač
- University of Zagreb, Faculty of Pharmacy and Biochemistry, A. Kovačića 1, 10000 Zagreb, Croatia.
| | - Mario-Livio Jeličić
- University of Zagreb, Faculty of Pharmacy and Biochemistry, A. Kovačića 1, 10000 Zagreb, Croatia.
| | - Daniela Amidžić Klarić
- University of Zagreb, Faculty of Pharmacy and Biochemistry, A. Kovačića 1, 10000 Zagreb, Croatia.
| | - Biljana Nigović
- University of Zagreb, Faculty of Pharmacy and Biochemistry, A. Kovačića 1, 10000 Zagreb, Croatia.
| | - Nikša Turk
- Clinical Hospital Center Zagreb, Kišpatićeva 12, 10000 Zagreb, Croatia.
| | - Ilija Klarić
- Public Health Brčko DC, R. Dž. Čauševića 1, 76100 Brčko DC, Bosnia and Herzegovina.
| | - Ana Mornar
- University of Zagreb, Faculty of Pharmacy and Biochemistry, A. Kovačića 1, 10000 Zagreb, Croatia.
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LIU HY, WEN JJ, HUANG ZH, MA H, XU HX, QIU YB, ZHAO WJ, GU CC. Prussian Blue Analogue of Copper-Cobalt Decorated with Multi-Walled Carbon Nanotubes Based Electrochemical Sensor for Sensitive Determination of Nitrite in Food Samples. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2019. [DOI: 10.1016/s1872-2040(19)61168-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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12
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Shpigun LK, Andryukhina EY. A New Electrochemical Sensor for Direct Detection of Purine Antimetabolites and DNA Degradation. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2019; 2019:1572526. [PMID: 30984441 PMCID: PMC6431463 DOI: 10.1155/2019/1572526] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Revised: 02/07/2019] [Accepted: 02/11/2019] [Indexed: 06/09/2023]
Abstract
The development of a reliable electrochemical sensor using a hybrid nanocomposite consisting of ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate) functionalized graphene oxide (GrO-IL) and gold nanoparticles (AuNPs) stabilized by chitosan (Chit) was described. The new sensor, labelled as GrO-IL-AuNPs-Chit/CSE, exhibited an improved electrocatalytic response to cancer drugs such as purine antimetabolites (6-thioguanine, 6-mercaptopurine, and azathioprine) in a wide concentration range with a low detection limit (20-40 nmol·L-1, S/N = 3), and satisfactory recoveries (97.1-103.0%). The sensor has been also successfully used for cyclic voltammetric study of a salmon sperm double-stranded DNA degradation and DNA-6-mercaptopurine interaction in aqueous solutions (pH 7.4).
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Affiliation(s)
- Liliya K. Shpigun
- Institute of General & Inorganic Chemistry of Russian Academy of Sciences, 119991 Moscow, Russia
| | - Elena Yu. Andryukhina
- Institute of General & Inorganic Chemistry of Russian Academy of Sciences, 119991 Moscow, Russia
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13
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In-situ decorated silver nanoparticles on electrospun poly (vinyl alcohol)/chitosan nanofibers as a plasmonic sensor for azathioprine determination. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.09.047] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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14
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Probing the antigen-antibody interaction towards ultrasensitive recognition of cancer biomarker in adenocarcinoma cell lysates using layer-by-layer assembled silver nano-cubics with porous structure on cysteamine caped GQDs. Microchem J 2018. [DOI: 10.1016/j.microc.2018.08.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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15
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Shahrokhian S, Hafezi-Kahnamouei M. Glassy carbon electrode modified with a nanocomposite of multi-walled carbon nanotube decorated with Ag nanoparticles for electrochemical investigation of Isoxsuprine. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.08.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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16
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Shpigun LK, Andryukhina EY. Electrochemical Sensor Based on Nanocomposite of Ionic Liquid Modified Graphene Oxide - Chitosan and its Application for Flow Injection Detection of Anticancer Thiopurine Drugs. ELECTROANAL 2018. [DOI: 10.1002/elan.201800358] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Liliya K. Shpigun
- Institute of General & Inorganic Chemistry of Russian Academy of Sciences; 119991 Moscow Russia
| | - Elena Yu. Andryukhina
- Institute of General & Inorganic Chemistry of Russian Academy of Sciences; 119991 Moscow Russia
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17
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Stanković DM, Ognjanović M, Martin F, Švorc Ľ, Mariano JF, Antić B. Design of titanium nitride- and wolfram carbide-doped RGO/GC electrodes for determination of gallic acid. Anal Biochem 2017; 539:104-112. [DOI: 10.1016/j.ab.2017.10.018] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Revised: 10/17/2017] [Accepted: 10/22/2017] [Indexed: 12/20/2022]
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18
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Gao N, Gao F, He S, Zhu Q, Huang J, Tanaka H, Wang Q. Graphene oxide directed in-situ deposition of electroactive silver nanoparticles and its electrochemical sensing application for DNA analysis. Anal Chim Acta 2016; 951:58-67. [PMID: 27998486 DOI: 10.1016/j.aca.2016.11.033] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 11/16/2016] [Accepted: 11/21/2016] [Indexed: 12/15/2022]
Abstract
The development of high-performance biosensing platform is heavily dependent on the recognition property of the sensing layer and the output intensity of the signal probe. Herein, we present a simple and highly sensitive biosensing interface for DNA detection on the basis of graphene oxide nanosheets (GONs) directed in-situ deposition of silver nanoparticles (AgNPs). The fabrication process and electrochemical properties of the biosensing interface were probed by electrochemical techniques and scanning electron microscopy. The results indicate that GONs can specifically adsorb at the single-stranded DNA probe surface, and induces the deposition of highly electroactive AgNPs. Upon hybridization with complementary oligonucleotides to generate the duplex DNA on the electrode surface, the GONs with the deposited AgNPs will be liberated from the sensing interface due to the inferior affinity of GONs and duplex DNA, resulting in the reduction of the electrochemical signal. Such a strategy combines the superior recognition of GONs toward single-stranded DNA and double-stranded DNA, and the strong electrochemical response of in-situ deposited AgNPs. Under optimal conditions, the biosensor can detect target DNA over a wide range from 10 fM to 10 nM with a detection limit of 7.6 fM. Also, the developed biosensor shows outstanding discriminating ability toward oligonucleotides with different mismatching degrees.
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Affiliation(s)
- Ningning Gao
- College of Chemistry and Environment, Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, 363000, PR China
| | - Feng Gao
- College of Chemistry and Environment, Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, 363000, PR China; Department of Chemistry, Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue, Shimane, 690-8504, Japan.
| | - Suyu He
- College of Chemistry and Environment, Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, 363000, PR China
| | - Qionghua Zhu
- College of Chemistry and Environment, Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, 363000, PR China
| | - Jiafu Huang
- College of Chemistry and Environment, Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, 363000, PR China
| | - Hidekazu Tanaka
- Department of Chemistry, Graduate School of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue, Shimane, 690-8504, Japan
| | - Qingxiang Wang
- College of Chemistry and Environment, Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, 363000, PR China.
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Silver nanoparticle-modified electrode for the determination of nitro compound-containing pesticides. Anal Bioanal Chem 2016; 408:2595-606. [PMID: 26873207 DOI: 10.1007/s00216-016-9367-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 01/20/2016] [Accepted: 01/26/2016] [Indexed: 02/07/2023]
Abstract
This paper reports the electroanalytical determination of pendimethalin and ethyl parathion by square-wave adsorptive stripping voltammetry using a material comprised of chitosan-stabilized silver nanoparticles to modify a glassy carbon electrode. Under optimized experimental conditions, the peak current was found to vary linearly with the concentration of pendimethalin in the range of 70 to 2000 nmol L(-1) and with concentration of ethyl parathion in the range of 40 to 8000 nmol L(-1). Detection limits of 36 and 40 nmol L(-1) were obtained for pendimethalin and ethyl parathion, respectively. The silver - nanoparticle-modified electrode was successfully employed for the analysis of pesticides in tap and mineral water (pendimethalin) and in lettuce and honey (ethyl parathion) samples. Pendimethalin recovery was between 94 and 100 %, and ethyl parathion recovery was between 97 and 101 %, indicating no significant matrix interference effects on the analytical results. The accuracy of the electroanalytical methodology using the proposed modified electrode was also compared to that of the UV-vis spectrophotometric method.
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