1
|
Dagar M, Brennessel WW, Matson EM. Elucidation of Design Criteria for V-based Redox Mediators: Structure-Function Relationships that Dictate Rates of Heterogeneous Electron Transfer. Chemistry 2024:e202400764. [PMID: 38574277 DOI: 10.1002/chem.202400764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2024] [Revised: 03/30/2024] [Accepted: 04/04/2024] [Indexed: 04/06/2024]
Abstract
Redox mediators are attractive solutions for addressing the stringent kinetic stipulations required for efficient energy conversion processes. In this work, we compare the electrochemical properties of four vanadium complexes, namely [V(acac)3], [V6O7(OMe)12], [nBu4N]3[V6O13(TRISNO2)2], and [nBu4N]5[V18O46(NO3)] in non-aqueous solutions on glassy carbon electrodes. The goal of this study is to investigate the electron transfer kinetics and diffusivity of these compounds under identical experimental conditions to develop an understanding of structure-function relationships that dictate the physicochemical properties of vanadium oxide assemblies. Complex selection was dictated by two criteria - (1) nuclearity of the transition metal complexes (2) distribution of electron density in the native electronic configuration. Our analyses establish that electronic communication between metal centers significantly impacts charge transfer kinetics of these vanadium-based compounds.
Collapse
Affiliation(s)
- Mamta Dagar
- University of Rochester, Department of Chemistry, Rochester, NY 14627, USA
| | | | - Ellen M Matson
- University of Rochester, Department of Chemistry, Rochester, NY 14627, USA
| |
Collapse
|
2
|
Yulkifli Y, Yandes WP, Isa IM, Hashim N, Ulianas A, Sharif SNM, Saidin MI, Ahmad MS, Yazid SNAM, Suyanta S, Nuryadi R, Abd Azis N. A Nanocomposite Paste Electrode Sensor for Simultaneous Detection of Uric Acid and Bisphenol A Using Zinc Hydroxide Nitrate-Sodium Dodecylsulfate Bispyribac. SENSORS (BASEL, SWITZERLAND) 2023; 23:8366. [PMID: 37896460 PMCID: PMC10610553 DOI: 10.3390/s23208366] [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: 07/27/2023] [Revised: 09/29/2023] [Accepted: 10/07/2023] [Indexed: 10/29/2023]
Abstract
The fabrication of a zinc hydroxide nitrate-sodium dodecylsulfate bispyribac modified with multi-walled carbon nanotube (ZHN-SDS-BP/MWCNT) paste electrode for uric acid and bisphenol A detection was presented in this study. Electrochemical impedance spectroscopy, chronocoulometry, square-wave voltammetry, and cyclic voltammetry were all used to examine the electrocatalytic activities of modified paste electrodes. The modified electrode's sensitivity and selectivity have been considered in terms of the composition of the modifier in percentages, the types of supporting electrolytes used, the pH of the electrolyte, and square-wave voltammetry parameters like frequency, pulse size, and step increment. Square-wave voltammetry is performed by applying a small amplitude square-wave voltage to a scanning potential from -0.3 V to +1.0 V, demonstrating a quick response time and high sensitivity. The ZHN-SDS-BP/MWCNT sensor demonstrated a linear range for uric acid and bisphenol A from 5.0 µM to 0.7 mM, with a limit of detection of 0.4 µM and 0.8 µM, respectively, with good reproducibility, repeatability, and stability as well. The modified paste electrode was successfully used in the determination of uric acid and bisphenol A in samples of human urine and lake water.
Collapse
Affiliation(s)
- Yulkifli Yulkifli
- Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Padang 25131, Indonesia
| | - Widya Putri Yandes
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim 35900, Perak, Malaysia; (W.P.Y.); (N.H.); (S.N.M.S.); (M.I.S.); (M.S.A.); (S.N.A.M.Y.)
| | - Illyas Md Isa
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim 35900, Perak, Malaysia; (W.P.Y.); (N.H.); (S.N.M.S.); (M.I.S.); (M.S.A.); (S.N.A.M.Y.)
| | - Norhayati Hashim
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim 35900, Perak, Malaysia; (W.P.Y.); (N.H.); (S.N.M.S.); (M.I.S.); (M.S.A.); (S.N.A.M.Y.)
| | - Alizar Ulianas
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Padang 25131, Indonesia;
| | - Sharifah Norain Mohd Sharif
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim 35900, Perak, Malaysia; (W.P.Y.); (N.H.); (S.N.M.S.); (M.I.S.); (M.S.A.); (S.N.A.M.Y.)
| | - Mohamad Idris Saidin
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim 35900, Perak, Malaysia; (W.P.Y.); (N.H.); (S.N.M.S.); (M.I.S.); (M.S.A.); (S.N.A.M.Y.)
| | - Mohamad Syahrizal Ahmad
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim 35900, Perak, Malaysia; (W.P.Y.); (N.H.); (S.N.M.S.); (M.I.S.); (M.S.A.); (S.N.A.M.Y.)
| | - Siti Nur Akmar Mohd Yazid
- Department of Chemistry, Faculty of Science and Mathematics, Universiti Pendidikan Sultan Idris, Tanjong Malim 35900, Perak, Malaysia; (W.P.Y.); (N.H.); (S.N.M.S.); (M.I.S.); (M.S.A.); (S.N.A.M.Y.)
| | - Suyanta Suyanta
- Department of Chemistry Education, Faculty of Mathematics and Natural Science, Yogyakarta State University, Yogyakarta 55281, Indonesia;
| | - Ratno Nuryadi
- Center for Materials Technology, Agency for the Assessment and Application of Technology, Puspiptek Building #224, South Tangerang, Banten 15314, Indonesia;
| | - Nurashikin Abd Azis
- Department of Academic Affairs, North Borneo University College, Wisma Angkatan Hebat, 1 Borneo, Jalan Sulaman, Kota Kinabalu 88400, Sabah, Malaysia;
| |
Collapse
|
3
|
Fil BA, Günaslan S. Treatment of Slaughterhouse Wastewaters with Ti/IrO2/RuO2 Anode and Investigation of Energy Consumption. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2022. [DOI: 10.1007/s13369-022-07233-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
|
4
|
Evaluation of Antioxidant Potential of Commercial Cinnamon Samples and Its Vasculature Effects. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:1992039. [PMID: 35368871 PMCID: PMC8967587 DOI: 10.1155/2022/1992039] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 02/01/2022] [Accepted: 02/25/2022] [Indexed: 12/17/2022]
Abstract
Growing concerns on free radicals are the oxidative processes associated with physiological damage. The consumption of functional foods and use of plants with antioxidant capacity are widespread. Given the importance of determining antioxidant capacity in relation to the therapeutic effect, this study was aimed at evaluating cinnamon extract (Cinnamomum sp.) in commercial samples by spectrophotometric and voltammetric methods and assessing the vascular activity of some samples. The spectrophotometric methods performed were DPPH (1,1-diphenyl-2-picrihydrazine), ABTS (2,21-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid)), and Folin-Ciocalteu radical sequestration assays. For the electrochemical experiments, a three-electrode system was used, consisting of carbon paste electrode, platinum wire, and Ag/AgCl/KClsat, representing the working, auxiliary, and reference electrodes, respectively. The electroanalytical methods used were differential pulse, square wave, and cyclic voltammetries. The extracts were prepared in hydroalcoholic solution. A calibration curve with gallic acid was calculated to quantify their equivalent amounts in the analyzed extract. The correlation between the electrochemical approach and the total phenols calculated by the ABTS, DPPH, and Folin-Ciocalteu methods was 0.63, 0.7, and 0.73, respectively, with 1 being an ideal directly proportional correlation. The correlation between spectrophotometric methods was 0.83. A biosensor was developed in a carbon paste electrode using the enzyme laccase, obtained by the fungus Marasmiellus colocasiae. It was observed that the antioxidant profile of the cinnamon samples had an analytical sign improvement of up to 4 times when compared with the electrode without the modification. The samples were analyzed by mass spectrometer, and the main chemical markers found were coumarin, cinnamaldehyde, and eugenol. Pharmacological trials showed that these samples also induce a significant vasorelaxant effect associated to antioxidant potential on vascular injury induced by oxidative stress. Thus, cinnamon showed a high antioxidant capacity, in agreement with the results obtained in other studies, emphasizing its importance as a functional food.
Collapse
|