Article
Chemistry, Analytical
Ancuta Dinu, Constantin Apetrei
Summary: This study reports the determination of ascorbic acid using platinum-based voltammetric sensors modified with potassium hexacyanoferrate-doped polypyrrole. The modified electrodes showed excellent sensitivity for ascorbic acid detection, with a detection limit of 2.5×10(-7) M. The analyses of pharmaceutical products with different concentrations of ascorbic acid validated the accuracy of the method.
Article
Chemistry, Analytical
Gizaw Tesfaye, Negussie Negash, Tesfu Hailu, Merid Tessema
Summary: An efficient sensor has been developed for simultaneous determination of gallic and folic acid in juice samples. The sensor exhibits high electrocatalytic activity and provides accurate measurement under optimized conditions.
Article
Environmental Sciences
Tran Thanh Tam Toan, Do Mai Nguyen, Doan Manh Dung, Dang Thi Ngoc Hoa, Le Thi Thanh Nhi, Nguyen Mau Thanh, Nguyen Nho Dung, Yasser Vasseghian, Nasrin Golzadeh
Summary: In this study, RGO was synthesized using AA as a reducing agent and modified on GCE to create RGO/GCE for the detection of TB in urine samples. Voltammetric analysis, specifically DP-ASV, demonstrated higher sensitivity and selectivity compared to spectrophotometric methods in detecting TB. The RGO/GCE showed excellent repeatability, reproducibility, and long-term stability, making it more effective in detecting TB in urine samples than bare GCE.
Article
Chemistry, Physical
C. Priya, S. Anuja, R. Suresh Babu, S. Sriman Narayanan
Summary: In this study, the precise electrochemical determination of dopamine was achieved by modifying a graphite electrode. The modified electrode allowed for the selective determination of dopamine at low concentrations at a lower oxidation potential, and demonstrated advantages such as simple fabrication, low cost, high sensitivity, good selectivity, reproducibility, and stability.
Article
Chemistry, Analytical
Yicheng Zhou, Li Dong, Tongtong Cao, Jiazheng Zhang, Xiaobo Zhang, Lin Liu, Chao Liu, Zhiwei Tong
Summary: By utilizing the ion-exchange property of lanthanum niobate KLaNb2O7, a nanocomposite of C3F7-azo+/LaNb2O7- was successfully synthesized. The nanocomposite showed excellent electrochemical performance and was capable of simultaneous detection of ascorbic acid and dopamine.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Electrochemistry
Abderrazak Hamam, Mounira Maiza
Summary: The electro-oxidation of ascorbic acid on a copper foil electrode was studied using cyclic voltammetry, showing good analytical performance. The oxidation reaction on the copper electrode is diffusion-controlled, with linear response to changes in ascorbic acid concentration. The copper electrode demonstrates good reproducibility, stability, and a low detection limit compared to other modified electrodes.
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2021)
Article
Chemistry, Analytical
Ivet Jimenez, Clara Perez-Rafols, Nuria Serrano, Manel del Valle, Jose Manuel Diaz-Cuzc
Summary: A voltammetric sensor based on the modification of a screen-printed carbon electrode with reduced graphene oxide (rGO-SPCE) was developed for the determination of capsaicin. The sensor showed improved sensitivity and repeatability compared to other modified electrodes. It achieved a low limit of detection and provided accurate results for the determination of capsaicin in various samples.
MICROCHEMICAL JOURNAL
(2023)
Article
Environmental Sciences
Pegah Kargarghomsheh, Mahsa Naghashan, Soraya Farhadiyan, Majid Arabameri, Fahimeh Tooryan, Nabi Shariatifar
Summary: In this study, the levels of 6 phthalic acid esters (PAEs) in fruit juice samples were measured using magnetic solid phase extraction (MSPE) method and gas chromatography-mass spectrometry (GC/MS) technique. The average concentration of total PAEs in all samples was 3.55 +/- 0.66 μg/L. DEHP (bis(2-ethylhexyl) phthalate) had a mean concentration of 0.82 +/- 0.31 μg/L, which was below the drinking water standard set by the United States Environmental Protection Agency (USEPA). The highest and lowest mean levels of PAEs were found in pineapple juice samples (4.44 +/- 0.57 μg/L) and mango juice samples (2.77 +/- 0.1 μg/L), respectively. Brand B (3.76 +/- 0.87 μg/L) and samples within the expiration date (3.64 +/- 0.72 μg/L) had the highest PAE levels.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Applied
Fabricio Alves Borges, Lucimara Mendonca Costa, Cesar Ricardo Teixeira Tarley, Giovana de Fatima Lima Martins, Eduardo Costa Figueiredo
Summary: The direct magnetic sorbent sampling flame atomic absorption spectrometry (DMSS-FAAS) was used to determine the lead levels in soy-based juice, whole grape juice, reconstituted grape juice, and orange nectar samples. Lead was extracted using a magnetic orange peel powder through dispersive solid phase extraction (d-SPE), and the analysis was performed using a magnetic probe in flame atomic absorption spectrometry (FAAS). The DMSS-FAAS method showed a sensitivity at least 14 times higher than the conventional d-SPE followed by FAAS analysis, allowing for easy quantification of lead in juice samples at very low concentrations without the need for mineralization.
Article
Spectroscopy
Wael I. Mortada, Hanan E. Zedan, Magdi E. Khalifa
Summary: An ion pair-based surfactant-assisted dispersive liquid-liquid microextraction with solidification of floating organic drop (IP-SA-DLLME-SFOD) method was developed for extraction of vanadium followed by spectrophotometric determination. Tannic acid (TA) and cetyl trimethylammonium bromide (CTAB) were used as complexing and ion-pairing agents, respectively. Under optimized conditions, the method showed good sensitivity, with low detection and quantification limits. The proposed method was successfully applied for spectrophotometric quantification of vanadium in fresh fruit juice samples.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Inorganic & Nuclear
K. M. Pallavi, G. P. Mamatha, G. Nagaraju, T. L. Soundarya
Summary: A novel electrochemical sensor based on NaTaO3 nanoparticles immobilized modified GCE was fabricated for sensitive and selective determination of dopamine in the presence of Ascorbic acid. The NaTaO3 nanoparticles were synthesized using a facile hydrothermal method and characterized using various analytical techniques. The modified electrode exhibited good electrochemical sensing properties for dopamine at low concentrations.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Thi Kim Thuong Nguyen, Thi Huong Giang Le, Nhan Thi Thanh Pham, Thi Hoa Hoang, Ha Phuong Nguyen, Mua Xuan Nguyen, Minh Huong Giang Dang, Huy Hoang Do, Thi Thao Ta, Xuan Thanh Bui
Summary: In this study, a glassy carbon electrode modified with electrochemical reduced graphene oxide (ErGO/GCE) was used to determine amaranth in soft drink and candy samples by adsorptive stripping voltammetry. The ErGO/GCE was fabricated through an electrochemical reduction process, and the characteristics of the graphene oxide and reduced graphene oxide were studied. The optimal conditions for determining amaranth were determined, and the proposed method can be applied for amaranth dye analysis in food.
MICROCHEMICAL JOURNAL
(2023)
Article
Multidisciplinary Sciences
Zaklina Z. Tasic, Marija B. Petrovic Mihajlovic, Milan B. Radovanovic, Ana T. Simonovic, Dragana Medic, Milan M. Antonijevic
Summary: The research aimed to develop a cheap and non-toxic electrochemical sensor for determining a target analyte and reducing electronic waste. The sensor was prepared using a graphite rod from zinc-carbon batteries and was used to detect L-tryptophan in a Britton-Robinson buffer solution. Two electrochemical methods, differential pulse voltammetry and cyclic voltammetry, were employed in the experiment. The pH value of the support solution, scan rate, and L-tryptophan concentration were found to affect the current response. The oxidation of L-tryptophan was determined to be an irreversible two-electron/two-proton reaction controlled by a mixture of adsorption and diffusion.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Xin Xu, Chuan-Hua Li, Hong Zhang, Xi-Ming Guo
Summary: In this study, Cu-TCPP@MOFs thin films were synthesized and utilized for the sensitive detection of ascorbic acid (AA) using electrochemical and photoelectrochemical methods. The Cu-TCPP@MOFs/GCE exhibited excellent electrocatalytic activities towards AA, allowing for the establishment of linear relationships and ideal detection limits in various electrochemical techniques. The Cu-TCPP MOFs@GCE sensing platform demonstrated a wider linear concentration range, lower detection limits, and higher sensitivity than other electrochemical methods. The proposed platform was successfully applied to accurately determine the AA concentration in real human serum samples.
Article
Chemistry, Analytical
Mahmoud AbdAllah, A. A. Hathoot, M. Abdel-Azzem
Summary: This study investigated the electrochemical oxidation of Thioctic Acid (TA) on a Carbon Paste Electrode (CPE) modified with copper-cobalt nanostructures and poly (1,5-Diaminonaphthalene) using square-wave voltammetry and cyclic voltammetry. The voltammetric sensor showed sensitivity to TA oxidation and the effects of deposition cycles, electro-polymerization, scan rate, and pH were optimized. The sensor exhibited good identification capabilities for TA with a linear response range of 0.6 µM to 150 µM and a detection limit of 0.48 µM. The oxidation of TA was controlled by the adsorption process. The proposed sensor and method were successfully used for TA determination in real samples.
