1
|
Xue C, Jamal R, Abdiryim T, Liu X, Liu F, Xu F, Cheng Q, Tang X, Fan N. An ionic liquid-modified PEDOT/Ti 3C 2T X based molecularly imprinted electrochemical sensor for pico-molar sensitive detection of L-Tryptophan in milk. Food Chem 2024; 449:139114. [PMID: 38581782 DOI: 10.1016/j.foodchem.2024.139114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 03/19/2024] [Accepted: 03/20/2024] [Indexed: 04/08/2024]
Abstract
L-Tryptophan (L-Trp) is essential for the human body and can only be obtained externally. It is important to develop a method to efficiently detect L-Trp in food. In this work, ionic liquid (IL) modified poly(3,4-ethylendioxythiophene)/ Titanium carbide (PEDOT/Ti3C2TX) was used as a substrate material to improve detection sensitivity. Molecular imprinted polymers (MIP) film for specific recognition of L-Trp was fabricated on the surface of modified electrodes using electrochemical polymerization. The monitoring results showed that the molecularly imprinted electrochemical sensors (MIECS) exhibited good linearity ranges (10-6 - 0.1 μM and 0.1-100 μM) with a low detection limit (LOD) of 2.09 × 10-7 μM. In addition, the MIECS exhibited remarkable stability, reproducibility, and immunity to interference. A good recovery (93.54-99.59%) was demonstrated in the detection of milk. The sensor was expected to be developed as a highly selective and sensitive portable assay, and applied to the detection of L-Trp in food.
Collapse
Affiliation(s)
- Cong Xue
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China
| | - Ruxangul Jamal
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Key Laboratory of Oil & Gas Fine Chemicals Ministry of Education & Xinjiang Uyghur Autonomous Region, School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, Xinjiang, PR China.
| | - Tursun Abdiryim
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China.
| | - Xiong Liu
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China
| | - Fangfei Liu
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China
| | - Feng Xu
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China
| | - Qian Cheng
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China
| | - Xinsheng Tang
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China
| | - Nana Fan
- State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, PR China
| |
Collapse
|
2
|
Sakalauskiene L, Brasiunas B, Popov A, Kausaite-Minkstimiene A, Ramanaviciene A. The Development of Reagentless Amperometric Glucose Biosensor Based on Gold Nanostructures, Prussian Blue and Glucose Oxidase. BIOSENSORS 2023; 13:942. [PMID: 37887135 PMCID: PMC10605372 DOI: 10.3390/bios13100942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 10/13/2023] [Accepted: 10/16/2023] [Indexed: 10/28/2023]
Abstract
Precise blood glucose detection plays a crucial role in diagnosing and medicating diabetes, in addition to aiding diabetic patients in effectively managing their condition. In this research, a first-generation reagentless amperometric glucose biosensor was developed by combining the graphite rod (GR) electrode modification by gold nanostructures (AuNS) and Prussian blue (PB) with glucose oxidase (GOx)-an enzyme that can oxidize glucose and produce H2O2. Firstly, AuNS was electrochemically deposited on the GR electrode (AuNS/GR), and then PB was electrochemically synthesized on the AuNS/GR electrode (PB/AuNS/GR). Finally, GOx was immobilized over the PB/AuNS nanocomposite with the assistance of Nafion (Nf) (Nf-GOx/PB/AuNS/GR). An application of PB in the design of a glucose biosensor enables an easy electrochemical reduction and, thus, the determination of the H2O2 produced during the GOx-catalyzed oxidation of glucose in the sample at a low operation potential of -0.05 V vs. Ag/AgCl/KCl3 mol L-1. In addition, AuNS increased the electrochemically active surface area, improved the GOx immobilization and ensured a higher analytical signal. The developed glucose biosensor based on the Nf-GOx/PB/AuNS/GR electrode exhibited a wide linear range, from 0.025 to 1 mmol L-1 of glucose, with a 0.0088 mmol L-1 limit of detection, good repeatability and high selectivity over electroactive interfering substances. The developed biosensor is convenient for the determination of glucose in the physiological environment.
Collapse
Affiliation(s)
- Laura Sakalauskiene
- NanoTechnas—Center of Nanotechnology and Materials Science, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko St. 24, LT-03225 Vilnius, Lithuania; (L.S.); (B.B.); (A.P.)
| | - Benediktas Brasiunas
- NanoTechnas—Center of Nanotechnology and Materials Science, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko St. 24, LT-03225 Vilnius, Lithuania; (L.S.); (B.B.); (A.P.)
| | - Anton Popov
- NanoTechnas—Center of Nanotechnology and Materials Science, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko St. 24, LT-03225 Vilnius, Lithuania; (L.S.); (B.B.); (A.P.)
- Department of Immunology, State Research Institute Centre for Innovative Medicine, Santariskiu St. 5, LT-08406 Vilnius, Lithuania
| | - Asta Kausaite-Minkstimiene
- NanoTechnas—Center of Nanotechnology and Materials Science, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko St. 24, LT-03225 Vilnius, Lithuania; (L.S.); (B.B.); (A.P.)
- Department of Immunology, State Research Institute Centre for Innovative Medicine, Santariskiu St. 5, LT-08406 Vilnius, Lithuania
| | - Almira Ramanaviciene
- NanoTechnas—Center of Nanotechnology and Materials Science, Faculty of Chemistry and Geosciences, Vilnius University, Naugarduko St. 24, LT-03225 Vilnius, Lithuania; (L.S.); (B.B.); (A.P.)
- Department of Immunology, State Research Institute Centre for Innovative Medicine, Santariskiu St. 5, LT-08406 Vilnius, Lithuania
| |
Collapse
|
3
|
Queiroz N, Mendes C, Nascimento J, Silva M, Oliveira JE, BEZERRA DE OLIVEIRA SEVERINOCARLOS. OXIDATION MECHANISM OF 1‐METHYL‐TRYPTOPHAN AND TRYPTOPHAN ON GLASSY CARBON ELECTRODE: A COMPARATIVE STUDY. ELECTROANAL 2022. [DOI: 10.1002/elan.202200249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
4
|
A cost-saving preparation of nickel nanoparticles/nitrogen-carbon nanohybrid as effective advanced electrode materials for highly sensitive tryptophan sensor. Microchem J 2021. [DOI: 10.1016/j.microc.2020.105744] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
5
|
Nie X, Zhang R, Tang Z, Wang H, Deng P, Tang Y. Sensitive and selective determination of tryptophan using a glassy carbon electrode modified with nano-CeO2/reduced graphene oxide composite. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105367] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
|
6
|
Atta NF, Galal A, Hassan SH. Comparative Study of Metallocene Modified Gold Nanoparticles Polymer Electrodes for Effective Determination of Dopamine. ELECTROANAL 2020. [DOI: 10.1002/elan.202060309] [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)
- Nada F. Atta
- Department of Chemistry Faculty of Science Cairo University 12613 Giza Egypt
| | - Ahmed Galal
- Department of Chemistry Faculty of Science Cairo University 12613 Giza Egypt
| | - Samar H. Hassan
- Department of Chemistry Faculty of Science Cairo University 12613 Giza Egypt
| |
Collapse
|
7
|
Rapid recognition and determination of tryptophan by carbon nanotubes and molecularly imprinted polymer-modified glassy carbon electrode. Bioelectrochemistry 2020; 131:107393. [DOI: 10.1016/j.bioelechem.2019.107393] [Citation(s) in RCA: 109] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 09/11/2019] [Accepted: 09/11/2019] [Indexed: 12/13/2022]
|
8
|
He Q, Liu J, Feng J, Wu Y, Tian Y, Li G, Chen D. Sensitive Voltammetric Sensor for Tryptophan Detection by Using Polyvinylpyrrolidone Functionalized Graphene/GCE. NANOMATERIALS 2020; 10:nano10010125. [PMID: 31936567 PMCID: PMC7023250 DOI: 10.3390/nano10010125] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2019] [Revised: 12/26/2019] [Accepted: 01/07/2020] [Indexed: 01/22/2023]
Abstract
In this paper, an electrochemical method for the measurement of tryptophan (Trp) was developed based on a glassy carbon electrode modified with polyvinylpyrrolidonefunctionalized graphene (PVP-GR)/glassy carbon electrode (GCE). In 0.1 M phosphate buffer solution (PBS, pH = 2.2), compared with bare GCE, PVP/GCE, and GR/GCE, the oxidation peak current of Trp increased dramatically at PVP-GR/GCE. The oxidation mechanism of Trp on the PVP-GR/GCE was discussed and the experimental conditions were optimized. Under the best experimental conditions, the oxidation peak current of Trp was proportional to its concentration in the range of 0.06 µM–10.0 µM and 10.0–100.0 µM, and the limit of detection (LOD) was 0.01 µM (S/N = 3). The target modified electrode with excellent repeatability, stability and selectivity, was successfully applied to detectTrp in drugs and biological samples.
Collapse
Affiliation(s)
- Quanguo He
- School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China;
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; (J.F.); (Y.W.); (Y.T.); (G.L.)
| | - Jun Liu
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; (J.F.); (Y.W.); (Y.T.); (G.L.)
- Correspondence: (J.L.); (D.C.); Tel./Fax: +86-731-2218-3383 (D.C.)
| | - Jinxia Feng
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; (J.F.); (Y.W.); (Y.T.); (G.L.)
| | - Yiyong Wu
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; (J.F.); (Y.W.); (Y.T.); (G.L.)
| | - Yaling Tian
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; (J.F.); (Y.W.); (Y.T.); (G.L.)
| | - Guangli Li
- School of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; (J.F.); (Y.W.); (Y.T.); (G.L.)
| | - Dongchu Chen
- School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China;
- Correspondence: (J.L.); (D.C.); Tel./Fax: +86-731-2218-3383 (D.C.)
| |
Collapse
|
9
|
Xia Y, Zhao F, Zeng B. A molecularly imprinted copolymer based electrochemical sensor for the highly sensitive detection of L-Tryptophan. Talanta 2020; 206:120245. [DOI: 10.1016/j.talanta.2019.120245] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 08/04/2019] [Accepted: 08/07/2019] [Indexed: 01/19/2023]
|
10
|
Poly(3,4-ethylenedioxythiophene)-modified electrodes for tryptophan voltammetric sensing. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.113309] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
11
|
Govindasamy M, Wang SF, Pan WC, Subramanian B, Ramalingam RJ, Al-Lohedan H. Facile sonochemical synthesis of perovskite-type SrTiO 3 nanocubes with reduced graphene oxide nanocatalyst for an enhanced electrochemical detection of α-amino acid (tryptophan). ULTRASONICS SONOCHEMISTRY 2019; 56:193-199. [PMID: 31101255 DOI: 10.1016/j.ultsonch.2019.04.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 03/23/2019] [Accepted: 04/01/2019] [Indexed: 05/21/2023]
Abstract
In this paper, perovskite-type SrTiO3 nanocubes decorated reduced graphene oxide is synthesized by sonochemical method. The as-synthesized SrTiO3@RGO nanocomposite was confirmed by XRD, TEM, SEM, elemental mapping and electrochemical technique. Furthermore, surface morphological and X-ray diffraction studies revealed the formation and high loading of SrTiO3 nanocubes on reduced graphene oxide matrix. The SrTiO3@RGO nanocomposite modified electrode shows an excellent electrochemical detection towards of amino acid (tryptophan). The developed sensor was showed a wide linear range from 30 nM to 917.3 µM and detection limit is 7.15 nM. Furthermore, the sensitivity was calculated to be 9.11 µA µM-1 cm2. In addition, the proposed modified sensor is exhibited good selectivity, stability, reproducibility and repeatability. The SrTiO3@RGO catalyst modified electrode was successfully applied to tryptophan analysis in biological samples.
Collapse
Affiliation(s)
- Mani Govindasamy
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao East Rd., Taipei 106, Taiwan
| | - Sea-Fue Wang
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao East Rd., Taipei 106, Taiwan.
| | - Wei Chih Pan
- Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, No. 1, Sec. 3, Chung-Hsiao East Rd., Taipei 106, Taiwan
| | - Bowya Subramanian
- Department of Electrical Engineering and Computer Science, National Taipei University of Technology, No.1, Section 3, Chung-Hsiao East Road, Taipei 106, Taiwan; Department of Information Technology, KSR College of Engineering, Tiruchengode, Tamil Nadu, India
| | - R Jothi Ramalingam
- Surfactant Research Chair, Chemistry Department, College of Science, King Saud University, P.O. Box-2455, Riyadh 11451, Saudi Arabia.
| | - Hamad Al-Lohedan
- Surfactant Research Chair, Chemistry Department, College of Science, King Saud University, P.O. Box-2455, Riyadh 11451, Saudi Arabia
| |
Collapse
|
12
|
A Simple and Efficient Molecularly Imprinted Electrochemical Sensor for the Selective Determination of Tryptophan. Biomolecules 2019; 9:biom9070294. [PMID: 31336671 PMCID: PMC6680830 DOI: 10.3390/biom9070294] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Revised: 07/17/2019] [Accepted: 07/17/2019] [Indexed: 12/30/2022] Open
Abstract
In this paper, a tryptophan (Trp) molecularly imprinted chitosan film was prepared on the surface of an acetylene black paste electrode using chitosan as the functional polymer, Trp as the template molecule and sulfuric acid as the crosslinking agent. The surface morphologies of non-imprinted and imprinted electrodes were characterized by scanning electron microscopy (SEM). The formation of hydrogen bonds between the functional polymer and the template molecule was confirmed by infrared spectroscopy. Some factors affecting the performance of the imprinted electrode such as the concentration of chitosan, the mass ratio of chitosan to Trp, the dropping amount of the chitosan-Trp mixture, the solution pH, and the accumulation potential and time were discussed. The experimental results show that the imprinted electrode exhibit good affinity and selectivity for Trp. The dynamic linear ranges of 0.01–4 μM, 4–20 μM and 20–100 μM were obtained by second derivative linear sweep voltammetry, and the detection limit was calculated to be 8.0 nM. The use of the imprinted electrode provides an effective method for eliminating the interference of potentially interfering substances. In addition, the sensor has high sensitivity, reproducibility and stability, and can be used for the determination of Trp in pharmaceutical preparations and human serum samples.
Collapse
|
13
|
Liu J, Dong S, He Q, Yang S, Xie M, Deng P, Xia Y, Li G. Facile Preparation of Fe 3O 4/C Nanocomposite and Its Application for Cost-Effective and Sensitive Detection of Tryptophan. Biomolecules 2019; 9:biom9060245. [PMID: 31234553 PMCID: PMC6627466 DOI: 10.3390/biom9060245] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 06/11/2019] [Accepted: 06/20/2019] [Indexed: 01/25/2023] Open
Abstract
In this study, we reported facile synthesis of Fe3O4/C composite and its application for the cost-effective and sensitive determination of tryptophan (Trp) in human serum samples. Fe3O4/C composites were prepared by a simple one-pot hydrothermal method followed by a mild calcination procedure, using FeCl3∙6H2O as Fe3O4 precursor, and glucose as reducing agent and carbon source simultaneously. The Fe3O4/C composite modified glassy carbon electrode (Fe3O4/C/GCE) was prepared by drop-casting method. The microstructure and morphology of Fe3O4/C composite was characterized by powder X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Due to large specific surface area and synergistic effect from Fe3O4 nanoparticles and carbon coating, Fe3O4/C composite showed excellent electrocatalytic activity toward the oxidation of Trp. As a result, the proposed Fe3O4/C/GCE displayed superior analytical performances toward Trp determination, with two wide detection ranges (1.0–80 μM and 80–800 μM) and a low detection limit (0.26 μM, S/N = 3). Moreover, successful detection of Trp in human serum samples further validate the practicability of the proposed sensor.
Collapse
Affiliation(s)
- Jun Liu
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China.
| | - Shuai Dong
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China.
| | - Quanguo He
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China.
| | - Suchun Yang
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China.
| | - Mei Xie
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China.
| | - Peihong Deng
- Key Laboratory of Functional Metal-Organic Compounds of Hunan Province; Key Laboratory of functional Organometallic Materials of Hunan Provincial Universities; Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China.
| | - Yonghui Xia
- Zhuzhou Institute for Food and Drug Control, Zhuzhou 412000, China.
| | - Guangli Li
- Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China.
| |
Collapse
|
14
|
Electrochemical Sensor for Rapid and Sensitive Detection of Tryptophan by a Cu 2O Nanoparticles-Coated Reduced Graphene Oxide Nanocomposite. Biomolecules 2019; 9:biom9050176. [PMID: 31072043 PMCID: PMC6571681 DOI: 10.3390/biom9050176] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 04/21/2019] [Accepted: 05/08/2019] [Indexed: 02/05/2023] Open
Abstract
In this paper, a nanocomposite of cuprous oxide and electrochemically reduced graphene oxide (Cu2O–ERGO) was prepared by a simple and low-cost method; hereby, a new method for the electrochemical determination of tryptophan (Trp) by this composite modified glassy carbon electrode (GCE) is proposed. The prepared materials and modified electrodes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and cyclic voltammetry (CV). The results showed that Cu2O–ERGO/GCE had good electrocatalytic activity for Trp. The effects of supporting electrolyte, scanning rate, accumulation potential, and accumulation time on the determination of Trp were studied. Under the optimum experimental conditions, Trp was quantitatively analyzed by square-wave voltammetry (SWV). The oxidation peak current of Trp had a good linear relationship with its concentration in the range of 0.02–20 μM, and the detection limit was 0.01 μM (S/N = 3). In addition, the modified electrode has high sensitivity, good repeatability, and long-term stability. Finally, the proposed method has been successfully applied in the determination of Trp concentration in practical samples.
Collapse
|
15
|
A highly selective and sensitive electrochemical sensor for tryptophan based on the excellent surface adsorption and electrochemical properties of PSS functionalized graphene. Talanta 2019; 196:309-316. [DOI: 10.1016/j.talanta.2018.12.058] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 12/05/2018] [Accepted: 12/21/2018] [Indexed: 11/17/2022]
|
16
|
Mattioli IA, Baccarin M, Cervini P, Cavalheiro ÉT. Electrochemical investigation of a graphite-polyurethane composite electrode modified with electrodeposited gold nanoparticles in the voltammetric determination of tryptophan. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2018.12.056] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
|
17
|
Nunes da Silva D, Teixeira Tarley CR, Pereira AC. Development of a Sensor Based on Modified Carbon Paste with Com Iron(III) Protoporphyrin Immobilized on SiNbZn Silica Matrix for L-tryptophan Determination. ELECTROANAL 2017. [DOI: 10.1002/elan.201700476] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Daniela Nunes da Silva
- Departamento de Ciências Naturais; Universidade Federal de São João del Rei (UFSJ); Campus Dom Bosco, Praça Dom Helvécio 74, Fábricas 36301-160 São João del Rei, mg Brazil
| | - César Ricardo Teixeira Tarley
- Departamento de Química; Universidade Estadual de Londrina (UEL), Centro de Ciências Exatas; Rodovia Celso Garcia Cid PR 445 Km 380 86050-482 Londrina, PR Brazil
| | - Arnaldo César Pereira
- Departamento de Ciências Naturais; Universidade Federal de São João del Rei (UFSJ); Campus Dom Bosco, Praça Dom Helvécio 74, Fábricas 36301-160 São João del Rei, mg Brazil
| |
Collapse
|
18
|
A l-tryptophan sensor based on tellurium nanorods modified glassy carbon electrode. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2016. [DOI: 10.1007/s13738-016-0833-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
|
19
|
Simultaneous determination of tyrosine and tryptophan by mesoporous silica nanoparticles modified carbon paste electrode using H-point standard addition method. Anal Chim Acta 2016; 902:89-96. [DOI: 10.1016/j.aca.2015.10.037] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 10/23/2015] [Accepted: 10/26/2015] [Indexed: 11/20/2022]
|
20
|
Atta NF, Ibrahim AH, Galal A. Nickel oxide nanoparticles/ionic liquid crystal modified carbon composite electrode for determination of neurotransmitters and paracetamol. NEW J CHEM 2016. [DOI: 10.1039/c5nj01804h] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ionic liquid crystals mimic the natural bio-based ionic liquid crystals such as cell membrane structures in their interactions with drugs.
Collapse
Affiliation(s)
- Nada F. Atta
- Chemistry Department
- Faculty of Science
- Cairo University
- 12013 Giza
- Egypt
| | - Asmaa H. Ibrahim
- Chemistry Department
- Faculty of Science
- Cairo University
- 12013 Giza
- Egypt
| | - Ahmed Galal
- Chemistry Department
- Faculty of Science
- Cairo University
- 12013 Giza
- Egypt
| |
Collapse
|
21
|
Wang Y, Ouyang X, Ding Y, Liu B, Xu D, Liao L. An electrochemical sensor for determination of tryptophan in the presence of DA based on poly(l-methionine)/graphene modified electrode. RSC Adv 2016. [DOI: 10.1039/c5ra24116b] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Electrocatalytic oxidation of l-Trp at poly(l-methionine)/graphene composite film modified glassy carbon electrode (PLME/GR/GCE) were investigated by differential pulse voltammetry.
Collapse
Affiliation(s)
- Yingzi Wang
- Department of Chemistry
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Xiaoqian Ouyang
- Department of Chemistry
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Yaping Ding
- Department of Chemistry
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Bingdi Liu
- Department of Chemistry
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Duo Xu
- Department of Chemistry
- Shanghai University
- Shanghai 200444
- P. R. China
| | - Lanfeng Liao
- Department of Chemistry
- Shanghai University
- Shanghai 200444
- P. R. China
| |
Collapse
|
22
|
Novel electrochemical sensor based on carbon nanodots/chitosan nanocomposite for the detection of tryptophan. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2015. [DOI: 10.1007/s13738-015-0662-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
23
|
Han J, Wang Q, Zhai J, Han L, Dong S. An amperometric sensor for detection of tryptophan based on a pristine multi-walled carbon nanotube/graphene oxide hybrid. Analyst 2015; 140:5295-300. [DOI: 10.1039/c5an00410a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A pMWCNT/GO hybrid shows excellent catalytic activity towards tryptophan oxidation and can thus be used as electrode material in a biosensor for sensing tryptophan sensitively and selectively.
Collapse
Affiliation(s)
- Junfeng Han
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Graduate School of the Chinese Academy of Sciences
- Changchun 130022
| | - Qingqing Wang
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Graduate School of the Chinese Academy of Sciences
- Changchun 130022
| | - Junfeng Zhai
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Graduate School of the Chinese Academy of Sciences
- Changchun 130022
| | - Lei Han
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Graduate School of the Chinese Academy of Sciences
- Changchun 130022
| | - Shaojun Dong
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Graduate School of the Chinese Academy of Sciences
- Changchun 130022
| |
Collapse
|
24
|
Pang TT, Du LM, Liu HL, Fu YL. Supramolecular p-sulfonated calix[4,6,8]arene for tryptophan detection. CAN J CHEM 2014. [DOI: 10.1139/cjc-2014-0150] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Numerous techniques have focused on the ability of p-sulfonated calix[n]arene to form complexes with tryptophan. Scanning electron microscopy and Fourier transform infrared spectroscopy were utilized to study the organization and molecular structure of different layers of the electrode surface. Scanning electron microscopy results showed that SC4A displayed a cubic structure whereas SC6A and SC8A displayed dendrite structures. The electrochemical properties and potential complex formation between SCnA and tryptophan were characterized by cyclic voltammetry and electrochemical impedance spectroscopy. Cyclic voltammetry experiments showed that the gold electrode was successfully functionalized by self-assembled cysteamine and SC4A. Electrochemical impedance spectroscopy results showed the observation of the tryptophan–SCnA interaction and indicated that SC4A had the highest sensitivity to tryptophan and allowed 2.04 μg L−1 tryptophan to be detected. Electrochemical impedance spectroscopy analysis and molecular modeling calculation confirmed that SC4A has higher tryptophan sensitivity than SC6A and SC8A.
Collapse
Affiliation(s)
- Tao-Tao Pang
- Analytical and Testing Center, Shanxi Normal University, Linfen 041004, P.R. China
| | - Li-Ming Du
- Analytical and Testing Center, Shanxi Normal University, Linfen 041004, P.R. China
| | - Hai-Long Liu
- Analytical and Testing Center, Shanxi Normal University, Linfen 041004, P.R. China
| | - Yun-Long Fu
- Analytical and Testing Center, Shanxi Normal University, Linfen 041004, P.R. China
| |
Collapse
|
25
|
Choudhary M, Ul Islam R, Witcomb MJ, Mallick K. In situ generation of a high-performance Pd-polypyrrole composite with multi-functional catalytic properties. Dalton Trans 2014; 43:6396-405. [PMID: 24604337 DOI: 10.1039/c3dt53567c] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on a bottom up approach for the synthesis of a Pd-polypyrrole nanocomposite material. The composite material was characterized by means of different techniques, such as UV-vis, IR, and Raman spectroscopy, which offered information about the chemical structure of the polymer, whereas electron microscopy images provided information regarding the morphology of the composite material and the distribution of the metal particles in the polymer matrix. During the synthesis of the nanocomposite, the Pd nanoparticles act as a catalyst for a model proton-coupled electron transfer reaction. The Pd-polypyrrole nanocomposite material was also used as a catalyst for the electro-catalytic detection of tryptophan, a precursor for some neurotransmitters.
Collapse
Affiliation(s)
- Meenakshi Choudhary
- Department of Chemistry, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa.
| | | | | | | |
Collapse
|
26
|
Pang TT, Cai ZF, Liu HL, Du LM, Guo MD, Fu YL. Determination of Tryptophan using ap-Sulfonated Calix [4,6,8]arene Modified Gold Electrode. ANAL LETT 2014. [DOI: 10.1080/00032719.2014.888722] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
|
27
|
Deng P, Xu Z, Feng Y. Acetylene black paste electrode modified with graphene as the voltammetric sensor for selective determination of tryptophan in the presence of high concentrations of tyrosine. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 35:54-60. [DOI: 10.1016/j.msec.2013.10.019] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 10/02/2013] [Accepted: 10/21/2013] [Indexed: 10/26/2022]
|
28
|
Boonchiangma S, Srijaranai S, Tuntulani T, Ngeontae W. A highly selective electrochemical sensor forl-tryptophan based on a screen-printed carbon electrode modified with poly-p-phenylenediamine and CdS quantum dots. J Appl Polym Sci 2014. [DOI: 10.1002/app.40356] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Suthasinee Boonchiangma
- Materials Chemistry Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry; Faculty of Science; Khon Kaen University; Khon Kaen 40002 Thailand
| | - Supalax Srijaranai
- Materials Chemistry Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry; Faculty of Science; Khon Kaen University; Khon Kaen 40002 Thailand
| | - Thawatchai Tuntulani
- Department of Chemistry; Faculty of Science; Chulalongkorn University; Bangkok 10330 Thailand
| | - Wittaya Ngeontae
- Materials Chemistry Research Unit, Department of Chemistry and Center of Excellence for Innovation in Chemistry; Faculty of Science; Khon Kaen University; Khon Kaen 40002 Thailand
| |
Collapse
|
29
|
Ghoreishi SM, Behpour M, Mousavi S, Khoobi A, Ghoreishi FS. Simultaneous electrochemical determination of dopamine, ascorbic acid and uric acid in the presence of sodium dodecyl sulphate using a multi-walled carbon nanotube modified carbon paste electrode. RSC Adv 2014. [DOI: 10.1039/c4ra04919e] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A carbon paste electrode modified with multi-walled carbon nanotubes (CPE/MWCNT) was prepared as a biosensor for the simultaneous determination of dopamine (DA), ascorbic acid (AA) and uric acid (UA) in the presence of sodium dodecyl sulphate (SDS).
Collapse
Affiliation(s)
- Sayed Mehdi Ghoreishi
- Department of Analytical Chemistry
- Faculty of Chemistry
- University of Kashan
- Kashan P.O. Box 87317-51167, I.R. Iran
| | - Mohsen Behpour
- Department of Analytical Chemistry
- Faculty of Chemistry
- University of Kashan
- Kashan P.O. Box 87317-51167, I.R. Iran
| | - Samira Mousavi
- Department of Analytical Chemistry
- Faculty of Chemistry
- University of Kashan
- Kashan P.O. Box 87317-51167, I.R. Iran
| | - Asma Khoobi
- Department of Analytical Chemistry
- Faculty of Chemistry
- University of Kashan
- Kashan P.O. Box 87317-51167, I.R. Iran
| | - Farzaneh Sadat Ghoreishi
- Department of Analytical Chemistry
- Faculty of Chemistry
- University of Kashan
- Kashan P.O. Box 87317-51167, I.R. Iran
| |
Collapse
|
30
|
Gold nanoparticles/polyaniline Langmuir–Blodgett Film modified glassy carbon electrode as voltammetric sensor for detection of epinephrine and uric acid. Talanta 2013; 117:333-7. [DOI: 10.1016/j.talanta.2013.09.035] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Revised: 09/16/2013] [Accepted: 09/19/2013] [Indexed: 11/20/2022]
|
31
|
Majidi MR, Salimi A, Alipour E. Development of Voltammetric Sensor for Determination of Tryptophan Using MWCNTs-modified Sol-gel Electrode. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201300248] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
32
|
Multi-walled carbon nanotube modified carbon paste electrode as a sensor for the amperometric detection of l-tryptophan in biological samples. J Colloid Interface Sci 2013; 402:223-9. [DOI: 10.1016/j.jcis.2013.03.059] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Revised: 03/27/2013] [Accepted: 03/28/2013] [Indexed: 11/17/2022]
|
33
|
Green synthesis of silver nanoparticles–graphene oxide nanocomposite and its application in electrochemical sensing oftryptophan. Biosens Bioelectron 2013. [DOI: 10.1016/j.bios.2012.10.029] [Citation(s) in RCA: 141] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
34
|
Moradi R, Sebt SA, Karimi-Maleh H, Sadeghi R, Karimi F, Bahari A, Arabi H. Synthesis and application of FePt/CNTs nanocomposite as a sensor and novel amide ligand as a mediator for simultaneous determination of glutathione, nicotinamide adenine dinucleotide and tryptophan. Phys Chem Chem Phys 2013; 15:5888-97. [PMID: 23486920 DOI: 10.1039/c3cp00033h] [Citation(s) in RCA: 143] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we report the synthesis and application of a FePt/CNTs nanocomposite as a highly sensitive sensor and novel amide ligand (9,10-dihydro-9,10-ethanoanthracene-11,12-dicarboximido)-4-ethylbenzene-1,2-diol as a mediator for the determination of glutathione (GSH), nicotinamide adenine dinucleotide (NADH) and tryptophan (Trp). The synthesized materials were characterized with different methods such as NMR, IR spectroscopy, TEM, XRD, FESEM, cyclic voltammetry, electrochemical impedance spectroscopy and square wave voltammetry (SWV). The modified electrode exhibited a potent and persistent electron mediating behavior followed by well-separated oxidation peaks of GSH, NADH and Trp. The peak currents were linearly dependent on GSH, NADH and Trp concentrations in the range of 0.08-220, 1.0-400 and 5.0-500 μmol L(-1), with detection limits of 0.05, 0.8 and 1.0 μmol L(-1), respectively. The modified electrode was used for the determination of these compounds in real samples.
Collapse
Affiliation(s)
- R Moradi
- Department of Physics, Science and Research Branch, Islamic Azad University, P.O. Box 14665-678, Tehran, Iran
| | | | | | | | | | | | | |
Collapse
|
35
|
A Voltammetric Sensor Based on NiO Nanoparticle-Modified Carbon-Paste Electrode for Determination of Cysteamine in the Presence of High Concentration of Tryptophan. J CHEM-NY 2013. [DOI: 10.1155/2013/946230] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|
36
|
Deng KQ, Zhou JH, Li XF. Direct electrochemical reduction of graphene oxide and its application to determination of l-tryptophan and l-tyrosine. Colloids Surf B Biointerfaces 2013; 101:183-8. [DOI: 10.1016/j.colsurfb.2012.06.007] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2012] [Revised: 06/01/2012] [Accepted: 06/11/2012] [Indexed: 10/28/2022]
|
37
|
Carvalho RC, Mandil A, Prathish KP, Amine A, Brett CMA. Carbon Nanotube, Carbon Black and Copper Nanoparticle Modified Screen Printed Electrodes for Amino Acid Determination. ELECTROANAL 2012. [DOI: 10.1002/elan.201200499] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
38
|
Electrochemical sensor for amino acids based on gold nanoparticles/macroporous carbon composites modified glassy carbon electrode. J Electroanal Chem (Lausanne) 2012. [DOI: 10.1016/j.jelechem.2012.10.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
39
|
Electrocatalytic oxidation of tyrosines shows signal enhancement in label-free protein biosensors. Trends Analyt Chem 2012. [DOI: 10.1016/j.trac.2012.07.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
40
|
Ziyatdinova GK, Ziganshina ER, Budnikov HC. Application of surfactants in voltammetric analysis. JOURNAL OF ANALYTICAL CHEMISTRY 2012. [DOI: 10.1134/s106193481211010x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
41
|
Sensitive electrochemical sensor of tryptophan based on Ag@C core–shell nanocomposite modified glassy carbon electrode. Anal Chim Acta 2012; 738:35-40. [DOI: 10.1016/j.aca.2012.06.008] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Revised: 05/30/2012] [Accepted: 06/06/2012] [Indexed: 11/19/2022]
|
42
|
Atta NF, Galal A, El-Ads EH. Gold nanoparticles-coated poly(3,4-ethylene-dioxythiophene) for the selective determination of sub-nano concentrations of dopamine in presence of sodium dodecyl sulfate. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.02.082] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
43
|
Xu CX, Huang KJ, Fan Y, Wu ZW, Li J, Gan T. Simultaneous electrochemical determination of dopamine and tryptophan using a TiO2-graphene/poly(4-aminobenzenesulfonic acid) composite film based platform. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2012. [DOI: 10.1016/j.msec.2012.02.022] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
44
|
Galal A, Atta NF, El-Ads EH. Probing cysteine self-assembled monolayers over gold nanoparticles – Towards selective electrochemical sensors. Talanta 2012; 93:264-73. [DOI: 10.1016/j.talanta.2012.02.032] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Revised: 02/11/2012] [Accepted: 02/15/2012] [Indexed: 11/28/2022]
|
45
|
Ye D, Luo L, Ding Y, Liu B, Liu X. Fabrication of Co3O4 nanoparticles-decorated graphene composite for determination of l-tryptophan. Analyst 2012; 137:2840-5. [DOI: 10.1039/c2an35175g] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
46
|
Atta NF, Galal A, El-Ads EH. A novel sensor of cysteine self-assembled monolayers over gold nanoparticles for the selective determination of epinephrine in presence of sodium dodecyl sulfate. Analyst 2012; 137:2658-68. [DOI: 10.1039/c2an16210e] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
47
|
Özcan A, Şahin Y. A novel approach for the selective determination of tryptophan in blood serum in the presence of tyrosine based on the electrochemical reduction of oxidation product of tryptophan formed in situ on graphite electrode. Biosens Bioelectron 2012; 31:26-31. [DOI: 10.1016/j.bios.2011.09.048] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Revised: 07/25/2011] [Accepted: 09/19/2011] [Indexed: 10/16/2022]
|
48
|
A carbon paste electrode modified with a cobalt(II) coordination polymer for the direct voltammetric determination of tryptophan. Mikrochim Acta 2011. [DOI: 10.1007/s00604-011-0740-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
49
|
Prabhu P, Babu RS, Narayanan SS. Electrocatalytic oxidation of l-tryptophan using copper hexacyanoferrate film modified gold nanoparticle graphite-wax electrode. Colloids Surf B Biointerfaces 2011; 87:103-8. [DOI: 10.1016/j.colsurfb.2011.05.008] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2011] [Revised: 04/30/2011] [Accepted: 05/03/2011] [Indexed: 11/25/2022]
|
50
|
Effect of surface modification of indium tin oxide by nanoparticles on the electrochemical determination of tryptophan. Talanta 2011; 85:2626-31. [DOI: 10.1016/j.talanta.2011.08.031] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Revised: 08/15/2011] [Accepted: 08/15/2011] [Indexed: 11/21/2022]
|