Article
Multidisciplinary Sciences
N. Hareesha, J. G. Manjunatha, Ammar M. Tighezza, Munirah D. Albaqami, Mika Sillanpaa
Summary: In this research, a low-cost, simple, and green carbon nanotube paste electrode activated with electropolymerized riboflavin (PRF) was successfully used for the selective and sensitive detection of catechol (CT) in the presence of resorcinol (RS) in 0.2 M phosphate buffer solution. The PRF-activated electrode showed improved electrochemical properties compared to a bare carbon nanotube paste electrode (BCNTPE), including increased electrochemical current and decreased electrochemical potential, resulting in outstanding sensitivity, stability, selectivity, reproducibility, and repeatability for the redox feature of CT. The CT concentrations were quantified using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods, with detection and quantification limits of 0.025 mu M and 0.085 mu M (CV method) and 0.0039 mu M and 0.0132 mu M (DPV method), respectively. The prepared PRFMCNTPE material showed promising results for real-time detection of CT in environmentally important tap water samples.
Article
Chemistry, Multidisciplinary
Hareesha Nagarajappa, Jamballi G. Manjunatha, Abdullah A. Al-Kahtani, Ammar M. Tighezza, Narges Ataollahi
Summary: The bare carbon nanotube paste electrode (BCNTPE) can be chemically modified for selective determination of riboflavin (RF) in the presence of dopamine (DA). A poly(titan yellow) modified carbon nanotubes paste electrode (PTYMCNTPE) was constructed using a simple and eco-friendly procedure and showed high electrocatalytic activity for the redox reaction of RF. The proposed sensor has great potential for the determination of RF in pharmaceutical samples.
Article
Chemistry, Inorganic & Nuclear
K. Abhayashri Kamath, J. G. Manjunatha, T. Girish, Mika Sillanpaa, M. Ammar, Munirah D. Albaqami
Summary: This study presents a sensitive electrochemical analysis of riboflavin using a modified electrode. The modified electrode showed excellent sensitivity and stability, and was capable of quantitative and qualitative analysis of riboflavin in medicinal samples.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
Radoslaw Porada, Nadine Wenninger, Christina Bernhart, Katarzyna Fendrych, Jolanta Kochana, Boguslaw Bas, Kurt Kalcher, Astrid Ortner
Summary: This work presents the targeted modification of carbon paste (CP) by adding conductive graphene oxide (GO) and mesoporous natural zeolite with Ni2+ cations (NiZ), which enhances the electrocatalytic properties. A univariate optimization showed that 5% (w/w) of NiZ and GO in the CP led to a threefold increase in peak current, decreased overpotential of paracetamol (PAR) oxidation, low background current, and high signal-to-noise ratio. The CPE/NiZ/GO sensor exhibited a linear response in the PAR concentration range of 0.004 to 0.12 mg L-1, with a low limit of detection of 0.0012 mg L-1 (0.0078 μM) and high stability (RSD = 3%). The proposed method demonstrated good selectivity and robustness to interference, and was successfully applied for the determination of PAR in pharmaceuticals, human urine, and serum.
MICROCHEMICAL JOURNAL
(2023)
Article
Chemistry, Analytical
Kader Vural, Serkan Karakaya, Didem Giray Dilgin, Hatice Ismet Gokcel, Yusuf Dilgin
Summary: To reduce the progression of COVID-19, new treatments and drug substances are needed. One such drug is Molnupiravir (MNP), which has shown effectiveness in reducing the virus and viral RNA. Accurate and quick detection of MNP in pharmaceutical or biological samples is crucial. This study describes the electrochemical behavior and sensitive voltammetric determination of MNP using a magnetite nanoparticle modified electrode.
MICROCHEMICAL JOURNAL
(2023)
Article
Biochemistry & Molecular Biology
Ewelina Skowron, Kaja Spilarewicz-Stanek, Dariusz Guziejewski, Kamila Koszelska, Radovan Metelka, Sylwia Smarzewska
Summary: The analytical performance of clay paste electrode and graphene paste electrode was compared using square wave voltammetry and cyclic voltammetry methods for the determination of paracetamol. The influence of pH and SWV parameters on the results was investigated.
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.
Article
Chemistry, Multidisciplinary
Nambudumada S. Prinith, Jamballi G. Manjunatha, Girish Tigari, Zeid A. ALOthman, Amer M. Alanazi, Anup Pandith
Summary: The study focused on the fabrication and application of Poly (serine) modified graphite carbon nanotube composite paste electrode for determining Riboflavin, showing enhanced catalytic performance and linear dependence for extended concentration range with low detection limit. The electrode was reproducible, highly stable, and successfully validated for various sample types, showcasing potential for electrochemical sensing of Riboflavin.
Article
Electrochemistry
P. M. Tembo, N. Dhabarde, V Subramanian
Summary: This study focused on the electrochemical detection of cyanide in water using anodized titanium dioxide nanotubes with iron and sulfur as sensing elements. The sensor showed a detection limit of 0.49 mu M and a sensitivity of -13.8 mAcm(-2) mu M-1. The sensor demonstrated high selectivity and could effectively detect low cyanide concentrations in water over several months.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
P. A. Pushpanjali, J. G. Manjunatha, N. Hareesha, B. M. Amrutha, C. Raril, Zeid A. ALOthman, Amer M. Alanazi, Anup Pandith
Summary: This study utilized a poly(L-ApA) layered graphene nanoplatelets paste electrode for the electrochemical study of riboflavin, optimizing parameters to achieve high sensing performance and proposing the redox mechanism of RF. The electrode was successfully applied for analyzing pharmaceutical samples and biological fluids with adequate recovery.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Inorganic & Nuclear
Sukanya, B. E. Kumara Swamy, J. K. Shashikumara, S. C. Sharma
Summary: A simple, novel, and cost-effective modified carbon paste electrode was fabricated for the detection of paracetamol. The electrode exhibited excellent electrocatalytic activity and fast electron transfer rate, resulting in accurate detection of paracetamol.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Arefeh Mohammadnavaz, Hadi Beitollahi, Sina Modiri
Summary: We developed a new electrochemical sensing platform for detecting L-Cysteine using a modified carbon paste electrode with multi-walled carbon nanotubes-Co3O4 nanocomoisite/benzoyl ferrocene/ionic liquid. The nanocomposite was fabricated through a facile hydrothermal protocol and characterized using various techniques. The modified electrode exhibited excellent catalytic activity towards L-Cys oxidation, as demonstrated by cyclic voltammetry. The sensor had a narrow detection limit, broad linear dynamic range, and good sensitivity.
INORGANICA CHIMICA ACTA
(2023)
Article
Chemistry, Analytical
Patricia Rebelo, Joao G. Pacheco, Iuliia V. Voroshylova, Andre Melo, M. Natalia D. S. Cordeiro, Cristina Delerue-Matos
Summary: The study developed a selective molecularly imprinted polymer (MIP) for detecting FZD in environmental waters, showing high efficiency and selectivity in the detection of the antibiotic.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Biochemistry & Molecular Biology
Aisha Ganash, Sahar Alshammari, Entesar Ganash
Summary: In this study, gold nanoparticles (AuNPs) were electrodeposited on a carbon-paste electrode (CPE) with varying thicknesses. The prepared AuNPs were characterized using different techniques. The fabricated modified electrode (AuNPs/CPE) exhibited high efficiency for the electrochemical determination of Congo red (CR) dye with high selectivity and sensitivity.
Article
Engineering, Electrical & Electronic
J. L. Nikhil, J. G. Manjunatha, N. Hareesha, B. Kanthappa, C. S. Karthik, P. Mallu, Zeid A. ALOthman
Summary: This study presents the analysis of electrochemical behavior of methyl orange (MO) with phosphate buffer solution in natural water sample using a carbon paste electrode modified with L-serine (LS). The modified electrode showed intensified electrochemical activity for the oxidation of MO, with 1.5-fold enhancement compared to the unmodified electrode. The results suggest that the PLSMCPE has potential for use in environmental monitoring and water quality analysis applications.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Analytical
Suresh N. Kodlady, B. Narayana, B. K. Sarojini, B. U. Gauthama, J. G. Manjunatha
Summary: A new colorimetric anion sensor ATH was synthesized and confirmed, which showed high selectivity for detecting fluoride ions and responded to fluoride ion stimulation through deprotonation and intramolecular charge transfer sensing mechanism. The sensing mechanism of fluoride ions was confirmed and the binding constant and binding ratio between fluoride ions and probe ATH were determined.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Karnayana P. Moulya, Jamballi G. Manjunatha, Ahmed Muteb Aljuwayid, Mohamed A. Habila, Mika Sillanpaa
Summary: The electrode for analyzing tartrazine was fabricated by electro-polymerization of niacin on the electrode surface. Cyclic voltammetry, electrochemical impedance spectroscopy, and field emission scanning electron microscopy were used to study the electrochemical response and surface morphology of the electrode. Various parameters were analyzed, and the limits of detection and quantification for tartrazine were determined. The fabricated electrode was also used to analyze tartrazine in food samples.
RESULTS IN CHEMISTRY
(2023)
Review
Biochemical Research Methods
Madikeri Manjunth Charithra, Jamballi Gangadarappa Gowda Manjunatha, Nagarajappa Hareesha, Subbaiah Nambudamada Prinith, Doddarsikere K. Ravishankar, Huligerepura J. Arpitha
Summary: This review article focuses on the voltammetric detection of neurotransmitters using carbon-based electrodes, highlighting their simplicity and high sensitivity. The achievements in the determination of various neurotransmitters with high selectivity and sensitivity using carbon-based electrodes are surveyed, with emphasis on the promising modification of the working electrode for further analysis.
COMBINATORIAL CHEMISTRY & HIGH THROUGHPUT SCREENING
(2023)
Article
Chemistry, Analytical
N. Hareesha, J. G. Manjunatha, T. Girish, Zeid A. ALOthman
Summary: This research presents a low-cost and green electrochemical method for the detection of the ecological toxin catechol. The electro-polymerised methyl orange-activated carbon paste electrode (Poly(MO)ACPE) was used as an electrocatalyst. The Poly(MO)ACPE demonstrated good electrocatalytic activity for the redox reaction of catechol, showing higher peak current response compared to the bare carbon paste electrode (BCPE).
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
(2023)
Article
Food Science & Technology
Sharmila Battira Madappa, Jamballi Gangadarappa Gowda Manjunatha, Ahmed Muteb Aljuwayid, Mohamed A. Habila, Mika Sillanpaa
Summary: An electropolymerized niacin modified carbon paste electrode was developed for the cyclic voltammetric analysis of indigo carmine. The electrode showed good sensitivity and selectivity towards indigo carmine, making it suitable for the detection of indigo carmine in food and water samples.
JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION
(2023)
Article
Chemistry, Multidisciplinary
B. Kanthappa, J. G. Manjunatha, N. Hareesha, Ammar M. M. Tighezza, Munirah D. D. Albaqami, Mika Sillanpaa
Summary: The study developed a sensitive, economical, green, and simple voltammetric sensor for detecting the redox behavior of rutin using an electrochemical polymerization method. The modified electrode (Poly(DL-PN)MGPE) demonstrated higher electrocatalytic activity and active sites compared to the bare graphene paste electrode (BGPE), enabling the analysis of rutin in phosphate-buffered saline (PBS) of pH 6.5. The Poly(DL-PN)MGPE exhibited excellent reproducibility, antifouling nature, repeatability, and stability for rutin detection, with a detection limit of 8.31 nM. The applicability of Poly(DL-PN)MGPE for rutin detection in citrus fruit juice samples was also discussed.
Article
Chemistry, Analytical
Kanthappa Bhimaraya, Jamballi G. Manjunatha, Karnayana P. Moulya, Ammar M. Tighezza, Munirah D. Albaqami, Mika Sillanpaa
Summary: The electrochemically polymerized glycine layered carbon paste electrode (EPGNLCPE) was used as an easy and rapid analytical tool for the analysis of levofloxacin (LN). The EPGNLCPE sensor, compared to the bare carbon paste electrode (BCPE), showed improved surface features and activities. Under optimized conditions, the differential pulse voltammetry method using EPGNLCPE exhibited good linearity, low limit of detection, and low limit of quantification for the analysis of LN. Real-time application of the sensor showed good recovery of LN in medicinal samples.
Article
Multidisciplinary Sciences
N. Hareesha, J. G. Manjunatha, Ammar M. Tighezza, Munirah D. Albaqami, Mika Sillanpaa
Summary: In this research, a low-cost, simple, and green carbon nanotube paste electrode activated with electropolymerized riboflavin (PRF) was successfully used for the selective and sensitive detection of catechol (CT) in the presence of resorcinol (RS) in 0.2 M phosphate buffer solution. The PRF-activated electrode showed improved electrochemical properties compared to a bare carbon nanotube paste electrode (BCNTPE), including increased electrochemical current and decreased electrochemical potential, resulting in outstanding sensitivity, stability, selectivity, reproducibility, and repeatability for the redox feature of CT. The CT concentrations were quantified using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods, with detection and quantification limits of 0.025 mu M and 0.085 mu M (CV method) and 0.0039 mu M and 0.0132 mu M (DPV method), respectively. The prepared PRFMCNTPE material showed promising results for real-time detection of CT in environmentally important tap water samples.
Article
Engineering, Electrical & Electronic
J. L. Nikhil, J. G. Manjunatha, N. Hareesha, B. Kanthappa, C. S. Karthik, P. Mallu, Zeid A. ALOthman
Summary: This study presents the analysis of electrochemical behavior of methyl orange (MO) with phosphate buffer solution in natural water sample using a carbon paste electrode modified with L-serine (LS). The modified electrode showed intensified electrochemical activity for the oxidation of MO, with 1.5-fold enhancement compared to the unmodified electrode. The results suggest that the PLSMCPE has potential for use in environmental monitoring and water quality analysis applications.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Pemmatte A. Pushpanjali, Jamballi G. Manjunatha, Nagarajappa Hareesha, Ammar M. Tighezza, Munirah D. Albaqami, Mika Sillanpaa
Summary: An inexpensive and efficient sensor was developed for the electrochemical analysis of cetirizine (CTZ). The active sites on the carbon nanotube paste electrode surface were improved by electropolymerization of poly(Glutamine). The modified electrode showed enhanced electrochemical response and was successfully applied to determine CTZ in tablet and human urine samples.
Article
Food Science & Technology
Girish Tigari, Jamballi G. Manjunatha, Hareesha Nagarajappa, Ammar M. Tighezza, Munirah D. Albaqami, Mika Sillanpaa
Summary: The article presents the use of eco-friendly and efficient materials including riboflavin, graphite, and graphene nanoplatelets in the fabrication of electrochemical sensors. The modified electrode, poly(riboflavin)/NaOH/graphene-nanoplatelets modified graphite paste electrode (PRFGMGPE), demonstrates excellent binding selectivity and anti-interference features for rutin detection. The electrode shows high sensitivity and low detection limit using differential pulse voltammetry (DPV), making it suitable for real-time testing in tea and blood serum samples with good recoveries.
JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION
(2023)
Article
Chemistry, Multidisciplinary
M. Asha, J. G. Manjunatha, K. P. Moulya, Samar A. Aldossari, Mohammed S. Mushab, S. Nagashree
Summary: The purpose of this study was to develop an electrochemical method for the detection of methyl orange and evaluate its behavior on different electrodes. The results showed that PRFMCPS had good stability and reproducibility under certain conditions, as determined by parameters such as pH value and scan rate. Additionally, the electrode showed a high detection limit and quantification limit for methyl orange.
MONATSHEFTE FUR CHEMIE
(2023)