Rajeev, Rijo., Benny, Libina., Roy, Moulisha., Mathew, Agnus
T., Akshaya, K B., Varghese, Anitha., Hegde, Gurumurthy. | <em><strong>A facile and economic electrochemical sensor for methylmalonic acid: A potential biomarker for vitamin B12 deficiency /</strong></em> | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:New Journal of Chemistry, Vol.46, Issue 9, pp.4114- 4125, ISSN No: 1144-0546 (Print) 1369-9261 (Online). A facile and cost-effective method based on a modified pencil graphite electrode (PGE) has been developed for the sensing of methylmalonic acid (MMA). The electrode (Ag–PEDOT/PGE) was designed by the electrodeposition of Ag nanoparticles (NPs) on carbon fibre paper (CFP) coated with poly(3,4-ethylenedioxythiophene) (PEDOT). Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and other electroanalytical techniques were used to characterize the modified electrodes. [show more]
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| Bharath, M., Mathew, Agnus T., Akshaya, K B., Sirimahachai, Uraiwan., Varghese, Anitha., Hegde, Gurumurthy. | <em><strong>Influence of electrochemical co-deposition of bimetallic Pt–Pd nanoclusters on polypyrrole modified ITO for enhanced oxidation of 4-(hydroxymethyl) pyridine /</strong></em> | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:New Journal of Chemistry, Vol.46, Issue 27, pp.17036-17048, ISSN No: 1144-0546 (Print) 1369-9261 (Online). Bimetallic Pt–Pd nanoparticles were dispersed on polypyrrole coated indium-tin oxide coated polyethylene terephthalate sheets (ITO-PET sheets). The excellent filming property of pyrrole gives a high porous uniform active area for the proper adsorption of bimetallic transition metal nanoparticles. Electrochemical behavior of the modified electrodes was determined using cyclic voltammetry and impedance studies. The physicochemical properties of the modified electrodes were analyzed by scanning electron microscopy, X-ray diffraction spectroscopy, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. [show more]
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| Kolaprath, Mrinalini Kalyani Ayilliath., Benny, Libina., Varghese Anitha. | A facile, green synthesis of carbon quantum dots from Polyalthia longifolia and its application for the selective detection of cadmium / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Dyes and Pigments, Vol.210, ISSN No: 0143-7208.
Carbon quantum dots (CQDs) has received world-wide recognition for their outstanding physicochemical properties that have the ability to substitute the semiconductor quantum dots. Herein, we have developed a strategy to determine the presence of Cd<sup>2+</sup> using CQDs as a fluorescence probe. The CQDs were synthesized from the leaves of <em>Polyalthia longifolia</em> (a natural source) through a one-step hydrothermal method. The CQDs obtained from <em>Polyalthia longifolia</em> (p-CQDs) was characterized using XRD, TEM, FTIR, Raman Spectroscopy, XPS Studies, UV–Visible spectroscopy and PL Spectroscopy. The p-CQDs displayed bright red fluorescence under the UV light, with good water solubility, and appreciable photostability and a quantum yield of 22%. The p-CQDs had a quasi-spherical morphology with an average particle size of 3.33 nm. [show more]
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| Jose, Sandra., Rajeev, Rijo., Thadathil, Ditto Abraham., Varghese, Anitha., Hegde, Gurumurthy. | A road map on nanostructured surface tuning strategies of carbon fiber paper electrode: Enhanced electrocatalytic applications / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Journal of Science: Advanced Materials and Devices, Vol.7, Issue 3, ISSN No: 2468-2179.
Impressive characteristics of carbon fiber paper (CFP) electrodes propound greater demand in electrochemical applications. CFP has a network structure composed of interwoven carbon fibers (CFs). The macroporous structure, chemical inertness, high conductivity, low cost, corrosion resistance, good electrical properties, mechanical strength, and self-standing capabilities have led to the large-scale acceptance of CFP. This review appraises the current progress of CFP based electrodes for electrocatalytic applications in the field of electrochemical sensors, electrochemical capacitors, batteries, electro Fenton oxidation, electrooxidation of alcohols, water splitting, hydrogen evolution reaction (HER), and oxygen evolution reaction (OER) together with the different fabrication strategies on the CFP substrate in an organized manner. [show more]
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| Meghana, M C., Nandhini, C., Benny, LIbina., George, Louis., Varghese, Anitha. | A road map on synthetic strategies and applications of biodegradable polymers / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Polymer Bulletin, Vol.79, ISSN No: 0170-0839 ( print) 1436-2449 (Online).
Biodegradable polymers have emerged as fascinating materials due to their non-toxicity, environmentally benign nature and good mechanical strength. The toxic effects of non-biodegradable plastics paved way for the development of sustainable and biodegradable polymers. The engineering of biodegradable polymers employing various strategies like radical ring opening polymerization, enzymatic ring opening polymerization, anionic ring opening polymerization, photo-initiated radical polymerization, chemoenzymatic method, enzymatic polymerization, ring opening polymerization and coordinative ring opening polymerization have been discussed in this review. [show more]
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| Abbo, Hanna., Cherian, Anila Rose., Titinchi, Salam., Varghese, Anitha. | An efficient inclusion complex based fluorescent sensor for mercury (II) and its application in live-cell imaging / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Journal of Fluorescence, Vol.32, pp.1109–1124, ISSN No: 1573-4994.
The formation of an inclusion complex between hydroxypropyl-β-cyclodextrin (H-CD) and 4-acetylphenyl-4-(((6-chlorobenzo[d]thiazol-2-yl)-imino)-methyl)-benzoate (L) was investigated by FT-IR, 1H-NMR, X-ray diffraction (XRD), FT-Raman, scanning electron microscope (SEM) techniques in the solid-state, absorption and emission spectroscopy in the liquid state and the virtual state as molecular docking technique. The binding properties of the inclusion complex (H-CD: L) with cations in deionized water was observed via absorbance and photoluminescence (PL) emission spectroscopy. [show more]
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| Thadathil, Ditto Abraham., Bharath, M., Varghese, Anitha., Ghosh, Munmun. | Anchored ferrocene based heterogeneous electrocatalyst for the synthesis of benzimidazoles / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Electrochimica Acta, Vol.435, ISSN No: 0013-4686.
A facile and sustainable electrochemical synthetic strategy for phenyl <a href="https://www.sciencedirect.com/topics/chemistry/benzimidazole" title="Learn more about benzimidazoles from ScienceDirect's AI-generated Topic Pages" class="topic-link">benzimidazoles</a> has been developed using a ferrocene-based <a href="https://www.sciencedirect.com/topics/chemistry/electrocatalyst" title="Learn more about electrocatalyst from ScienceDirect's AI-generated Topic Pages" class="topic-link">electrocatalyst</a> anchored on Toray carbon paper (TCP) coated with conducting polymeric film. The developed electrode was used for the electrochemical dehydrogenative <a href="https://www.sciencedirect.com/topics/chemistry/cyclization-reaction" title="Learn more about cyclization reaction from ScienceDirect's AI-generated Topic Pages" class="topic-link">cyclization reaction</a> of </span><em>o</em><span>-phenylene <a href="https://www.sciencedirect.com/topics/chemistry/diamine" title="Learn more about diamine from ScienceDirect's AI-generated Topic Pages" class="topic-link">diamine</a> and <a href="https://www.sciencedirect.com/topics/chemistry/benzaldehyde" title="Learn more about benzaldehyde from ScienceDirect's AI-generated Topic Pages" class="topic-link">benzaldehyde</a> using lithium perchlorate/acetonitrile as electrolyte. The surface characteristic properties of the developed electrode were characterized by <a href="https://www.sciencedirect.com/topics/chemistry/field-emission-scanning-electron-microscopy" title="Learn more about FESEM from ScienceDirect's AI-generated Topic Pages" class="topic-link">FESEM</a>, Optical profilometer and X-ray photoelectron spectroscopy. </span> [show more]
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| Agnihotri, Ananya S., Maria, CG Ann., Varghese, Anitha., Mane, Pratap., Chakraborty, Brahmananda., Nidhin, M. | CoFe2O4-APTES nanocomposite for the selective determination of tacrolimus in dosage forms: Perspectives from computational studies / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Surfaces and Interfaces, Vol.35, ISSN No: 2468-0230.
An innovative and cost effective electrochemical sensor was fabricated to determine tacrolimus (TAC) in pharmaceutical samples. In the present study, cobalt ferrite nanoparticles (CFO) were synthesized hydrothermally using chitosan as the template and were further functionalized using (3-Aminopropyl) triethoxysilane (APTES). The synthesized CFO were characterized using various analytical techniques such as X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, vibrating sample magnetometry and high- resolution transmission electron microscopy. The CFO and CFO-APTES were further drop-casted on to the glassy carbon electrode (CFO-NH2/GCE) for the electrochemical determination of TAC. [show more]
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| Mattam, Liya Benny., Bijoy, Anusha., Thadathil, Ditto Abraham., George, Louis., Varghese, Anitha. | Conducting polymers: A versatile material for biomedical applications / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:ChemistrySelect, Vol.7, Issue 42, ISSN No: 2365-6549.
Conducting polymers (CPs) are organic polymers with metallic conductivity or semiconducting properties which have drawn considerable attention globally. They are versatile materials because of their excellent environmental stability, electrical conductivity, economic importance as well as optical and electronic properties. CPs are interesting because they can be functionalized in several ways and the chemical properties are fine-tuned by incorporating new functionalities, making them more suitable in biomedical and other applications. [show more]
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| Keerthana, P., Cherian, Anila Rose., Sirimahachai, Uraiwan., Thadathil, Ditto Abraham., Varghese, Anitha., Hegde, Gurumurthy. | Detection of picric acid in industrial effluents using multifunctional green fluorescent B/N-carbon quantum dots / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Journal of Environmental Chemical Engineering, Vol.10, Issue 2, ISSN No: 2213-3437.
Carbon quantum dots have recently gained widespread attention due to their excellent physicochemical features. The rapid escalation in the dumping of hazardous chemicals into water, spurred demand for developing efficient and selective sensors for toxic chemicals. Herein, we have developed a novel fluorescence sensor for picric acid which is a major pollutant in industrial effluents. The new strategy exploits the development of a fluorescence sensor based on N-doped carbon quantum dots (N-CQDs) followed by boron functionalization. The N-CQDs were synthesized in a rapid single-step microwave technique by employing L-serine and citric acid. [show more]
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| Cherian, Anila Rose., Benny, LIbina., George, Ashlay., Sirimahachai, Uraiwan., Varghese, Anitha., Hegde, Gurumurthy. | Electro fabrication of molecularly imprinted sensor based on Pd nanoparticles decorated poly-(3 thiophene acetic acid) for progesterone detection / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Electrochimica Acta, Vol.408, ISSN No: 0013-4686.
In recent years, scientific community has witnessed substantial interest in the design and engineering of electrodes as sensing platforms towards sensitive and selective detection of hormones. An electrochemical strategy for the detection of progesterone was proposed by generating a composite film comprising of palladium nanoparticles with 3-thiophene acetic acid (3-TAA) coupled with molecular imprinting technology. Progesterone molecule was employed as the template while generating molecular imprints by electropolymerization on the surface of the Carbon Fibre Paper (CFP) electrode. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry were used to analyse the various modified working electrodes (CV). [show more]
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| Thadathil, Ditto Abraham., Varghese, Anitha., Ahamed, Chekrain Valappil Shihas., Krishnakumar, K A., Varma, Sanjay Suresh., Lankalapalli, Ravi S., Radhakrishnan, Kokkuvayil Vasu. | Enzyme based bioelectrocatalysis over laccase immobilized poly-thiophene supported carbon fiber paper for the oxidation of D-ribofuranose to D-ribonolactone / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Molecular Catalysis, Vol.524, ISSN No: 2468-8231.
A modified electrode based on laccase immobilized poly-thiophene-3-carboxylic acid supported on carbon fiber paper was developed for the electrocatalytic oxidation of D-ribofuranose to otherwise difficult-to-access D-ribonolactone, a precursor for C-nucleoside based drug like Remdesivir. The electrochemical oxidation of D-ribofuranose was achieved by the TEMPO-mediated electrochemical process. The experimental parameters were optimized and validated using Design of Experiment (DoE) statistical tool indicating the concentration of TEMPO and stirring as important parameters in bulk electrolysis. [show more]
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| Babu, Ann Mariella., Bijoy, Geethanjali., Keerthana, P., Varghese, Anitha. | Fluorescent detection of Pb2+ pollutant in water samples with the help of Delonix regia leaf-derived CQDs / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Synthetic Metals, Vol.291, ISSN No: 0379-6779.
Heavy metals released from different sources into water bodies are a major concern in the view of environmental protection. Their non-biodegradability and the numerous health hazards add to the issue. Scientists worldwide have emphasized the issue and are trying to resolve it by different means. Among all the methods, the fluorescent method stands out for its simplicity and rapid results. Here, the study focuses on the development of an efficient and sustainable method for the detection of lead in waste-water effluents. Carbon quantum dots (GCDs), a highly non-toxic substance developed from <em>Delonix regia</em> leaves for the purpose via a simple hydrothermal method. [show more]
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| Cherian, Anila Rose., Keerthana, P., Bhat, Vinay S., Sirimahachai, Uraiwan., Varghese, Anitha., Hegde, Gurumurthy. | Label free electrochemical detection of stress hormone cortisol using sulphur doped graphitic carbon nitride on carbon fiber paper electrode / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:New Journal of Chemistry, Vol.46, Issue 41, pp.19975-19983, ISSN No: 1144-0546 (Print) 1369-9261 (Online).
Sulphur doped graphitic carbon nitride (SGCN) was effectively prepared and comprehensively described. A straightforward synthetic process based on thermal condensation was reported for the synthesis of SGCN using thiourea as a precursor. Cyclic voltammetry (CV) and differential pulse voltammetry were used to evaluate the electrochemical performance of cortisol. SGCN sheets were used to boost the electro-catalytic activity, exhibiting very exceptional electrochemical behaviour towards cortisol. As a result, we obtained a broad linear response range of 0.1–100 μM, as well as a comparatively low detection limit (15.8 × 10−8 M). Furthermore, the fabricated SGCN/CFP electrode shows excellent selectivity in the presence of a large number of possible interfering species. [show more]
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| Benny, Libina., Cherian, Anila Rose., Keerthana, P., Varghese, Anitha., Hegde, Gurumurthy. | Laccase mediated electrosynthesis of heliotropin on mango-kernel derived carbon nanosphere composite: A sustainable approach / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Journal of Science: Advanced Materials and Devices, Vol.7, Issue 4, pp.1-11, ISSN No: 2468-2179.
Facile fabrication of enzyme immobilized carbon nanospheres (CNS) based catalysts with high electrical conductivity and catalytic efficiency are of decisive importance for their electrocatalysis. A novel, green and highly efficient synthesis route is reported here for the development of an electrode surface with enhanced electrical conductivity and better catalytic activity for the electrochemical synthesis of heliotropin. The obtained biowaste (mango seed kernels) was pyrolyzed and subjected to acid treatment to form functionalized CNS (f-CNS). The functionalized carbon fiber paper (CFP) electrode was employed as a template for laccase immobilization which was further treated with free laccase resulting in the formation of Lac-fCNS/CFP electrode. [show more]
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| Rajeev, Rijo., Thadathil, Ditto Abraham., Varghese, Anitha. | New horizons in surface topography modulation of MXenes for electrochemical sensing toward potential biomarkers of chronic disorders / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Critical Reviews in Solid State and Materials Sciences, Vol.7, Issue 3, pp.1-43, ISSN No: 1547-6561.
MXenes are recently advanced two-dimensional layered nanomaterials that have various characteristic properties for developing electrochemical sensors for bioanalytical applications, such as hydrophilicity, good biocompatibility, electrical conductivity, heightened ion transportation, and ease of functionalization. MXenes are revealed to be having applications in various other fields including energy storage, and catalysis. The combination of a layered structure, biocompatibility, and high surface functionalities makes MXene a highly versatile material for electrochemical sensing applications. The effect of various synthesis and functionalization strategies on tuning the properties of MXenes toward improving sensing abilities has been comprehensively discussed. [show more]
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| Sumana, V S., Sudhakar, Y N., Varghese, Anitha., Nagaraja, G K. | Pt nanoflower-poly(aniline) electrode material with the synchronized concept of energy storage in supercapacitor / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Applied Surface Science, Vol.589, ISSN No: 0169-4332.
Electrochemically deposited porous film of poly(aniline) (PANI) on stainless steel (SS) current collector is employed as the support for electrodeposition of platinum (Pt). PANI facilitates the formation of Pt nanoflowers with an enhanced electrochemically active surface area compared with sub-micron size Pt particles deposited on the bare SS electrode. Hence, a new concept Pt nanoflower-PANI electrode materials with synchronization between redox mode in PANI and double-layer mode of charge storage in Pt nanoflower is discussed. Remarkably, Pt is distributed like a nano-flower on the surface of PANI and prevents PANI from stripping during the charge-discharge process, thereby minimizing the issue of stripping in conducting polymer-based electrodes. [show more]
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| Rison, Sherin., Mathew, Agnus T., George, Louis., Hegde, Gurumurthy., Varghese, Anitha. | Pt nanospheres decorated graphene-β-CD modified pencil graphite electrode for the electrochemical determination of vitamin B6 / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Topics in Catalysis, Vol.65, pp.1-11, ISSN No: 1572-9028.
An electrochemical sensor for Vitamin B6 determination has been prepared by the electrochemical deposition of Pt nanospheres on graphene-β-CD coated Pencil Graphite Electrode (PGE). Cyclic voltammetric (CV) and electrochemical impedance spectroscopic (EIS) studies were employed to explore the electrochemical properties of the modified electrode. The physicochemical properties of the modified electrodes were characterized by X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and optical profilometric studies. [show more]
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| S, Athira Sradha., George, Louis., Varghese, Anitha. | Recent advances in electrochemical and optical sensing of the organophosphate chlorpyrifos: A review / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:Critical Reviews in Toxicology, Vol.52, Issue 6, ISSN No: 1040-8444.
Chlorpyrifos (CP) is one of the most popular organophosphorus pesticides that is commonly used in agricultural and nonagricultural environments to combat pests. However, several concerns regarding contamination due to the unmitigated use of chlorpyrifos have come up over recent years. This has popularized research on various techniques for chlorpyrifos detection. Since conventional methods do not enable smooth detection, the recent trends of chlorpyrifos detection have shifted toward electrochemical and optical sensing techniques that offer higher sensitivity and selectivity. [show more]
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| Rodrigues, Roopa Margaret., Thadathil, Ditto Abraham., Ponmudi, Keerthana., George, Ashlay., Varghese, Anitha. | Recent advances in electrochemical synthesis of nitriles: A sustainable approach / | Research Publication | Chemistry |
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Type:Research Publication Subject:Chemistry |
Description:ChemistrySelect, Vol.7, Issue 12, ISSN No: 2365-6549.
Nitriles unveil widespread applications in pharmaceuticals, agrochemicals, textiles, rubber, polymers, and constitute a significant intermediate in several organic transformations, necessitating the design of simple and environmentally benign pathways for their synthesis. Over the recent years, electro-organic reactions have found widespread attention in developing effective and selective organic synthesis. They possess several advantages: high atom economy, selectivity, minimal waste production, and shorter routes to multistep traditional organic reactions. The development of novel strategies for greener and sustainable electro-organic synthesis of nitriles is therefore commendable. [show more]
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