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Balamurugan M, Jang JH, Kim JE, Choi WI, Jo YI, Park S, Varathan E, Nam KT. Tuning the CO 2 Reduction Selectivity of an Immobilized Molecular Ag Complex beyond CO. Inorg Chem 2024; 63:7992-8000. [PMID: 38627375 DOI: 10.1021/acs.inorgchem.4c01140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2024]
Abstract
The electrochemical reduction of carbon dioxide (CO2) to produce fuels and chemicals has garnered significant attention. However, achieving control over the selectivity of the resulting products remains a challenging task, particularly within molecular systems. In this study, we employed a molecular silver complex immobilized on graphitized mesoporous carbon (GMC) as a catalyst for converting CO2 into CO, achieving an impressive selectivity of over 90% at -1.05 V vs RHE. Notably, the newly formed silver nanoparticles emerged as the active sites responsible for this high CO selectivity rather than the molecular system. Intriguingly, the introduction of copper ions into the restructured Ag-nanoparticle-decorated carbon altered the product selectivity. At -1.1 V vs RHE in 0.1 M KCl, we achieved a high C2 selectivity of 75%. Furthermore, not only the Ag-Cu bimetallic nanoparticle but also the small-sized Ag-Cu nanocluster decorated over GMC was proposed as active sites during catalytic reactions. Our straightforward approach offers valuable insights for fine-tuning the product selectivity of immobilized molecular systems, extending beyond C1 products.
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Affiliation(s)
- Mani Balamurugan
- Department of Materials Science Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
- Soft Foundry, Seoul National University, Seoul 08826, South Korea
| | - Jun Ho Jang
- Department of Materials Science Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Jeong Eun Kim
- Department of Materials Science Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Won Il Choi
- Department of Materials Science Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Young In Jo
- Department of Materials Science Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Sunghak Park
- Department of Materials Science Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Elumalai Varathan
- Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur 603203, Tamil Nadu, India
| | - Ki Tae Nam
- Department of Materials Science Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
- Soft Foundry, Seoul National University, Seoul 08826, South Korea
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2
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Balamurugan M, Meera DS. Hybrid optimized temporal convolutional networks with long short-term memory for heart disease prediction with deep features. Comput Methods Biomech Biomed Engin 2024:1-25. [PMID: 38584483 DOI: 10.1080/10255842.2024.2310075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Accepted: 01/10/2024] [Indexed: 04/09/2024]
Abstract
A heart attack is intended as top prevalent among all ruinous ailments. Day by day, the number of affected people count is increasing globally. The medical field is struggling to detect heart disease in the initial step. Early prediction can help patients to save their life. Thus, this paper implements a novel heart disease prediction model with the help of a hybrid deep learning strategy. The developed framework consists of various steps like (i) Data collection, (ii) Deep feature extraction, and (iii) Disease prediction. Initially, the standard medical data from various patients are acquired from the clinical standard datasets. Here, a One-Dimensional Convolutional Neural Network (1DCNN) is utilized for extracting the deep features from the acquired medical data to minimize the number of redundant data from the gathered large-scale data. The acquired deep features are directly fed to the Hybrid Optimized Deep Classifier (HODC) with the integration of Temporal Convolutional Networks (TCN) with Long Short-Term Memory (LSTM), where the parameters in both classifiers are optimized using the newly suggested Enhanced Forensic-Based Investigation (EFBI) inspired meta-optimization algorithm. Throughout the result analysis, the accuracy and precision rate of the offered approach is 98.67% and 99.48%. The evaluation outcomes show that the recommended system outperforms the extant systems in terms of performance metrics examination.
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Affiliation(s)
- M Balamurugan
- Research Scholar, Department of Computer Science and Engineering, Vels Institute of Science, Technology & Advanced Studies (VISTAS), Chennai, India
| | - Dr S Meera
- Associate Professor, Vels Institute of Science, Technology & Advanced Studies (VISTAS), Pallavaram, Chennai, Tamil Nadu, India
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3
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Choi S, Choi WI, Lee JS, Lee CH, Balamurugan M, Schwarz AD, Choi ZS, Randriamahazaka H, Nam KT. A Reflection on Sustainable Anode Materials for Electrochemical Chloride Oxidation. Adv Mater 2023; 35:e2300429. [PMID: 36897816 DOI: 10.1002/adma.202300429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 02/28/2023] [Indexed: 06/18/2023]
Abstract
Chloride oxidation is a key industrial electrochemical process in chlorine-based chemical production and water treatment. Over the past few decades, dimensionally stable anodes (DSAs) consisting of RuO2 - and IrO2 -based mixed-metal oxides have been successfully commercialized in the electrochemical chloride oxidation industry. For a sustainable supply of anode materials, considerable efforts both from the scientific and industrial aspects for developing earth-abundant-metal-based electrocatalysts have been made. This review first describes the history of commercial DSA fabrication and strategies to improve their efficiency and stability. Important features related to the electrocatalytic performance for chloride oxidation and reaction mechanism are then summarized. From the perspective of sustainability, recent progress in the design and fabrication of noble-metal-free anode materials, as well as methods for evaluating the industrialization of novel electrocatalysts, are highlighted. Finally, future directions for developing highly efficient and stable electrocatalysts for industrial chloride oxidation are proposed.
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Affiliation(s)
- Seungwoo Choi
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea
- Soft Foundry, Seoul National University, Seoul, 08826, South Korea
| | - Won Il Choi
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea
| | - Jun-Seo Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea
| | - Chang Hyun Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea
| | - Mani Balamurugan
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea
| | - Andrew D Schwarz
- Milton Hill Business and Technology Centre, Infineum, Abingdon, OX13 6BB, UK
| | - Zung Sun Choi
- Infineum Singapore LLP, Singapore, 098632, Singapore
| | | | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea
- Soft Foundry, Seoul National University, Seoul, 08826, South Korea
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Choi WI, Choi S, Balamurugan M, Park S, Cho KH, Seo H, Ha H, Nam KT. Ru-Doped Co 3O 4 Nanoparticles as Efficient and Stable Electrocatalysts for the Chlorine Evolution Reaction. ACS Omega 2023; 8:35034-35043. [PMID: 37779938 PMCID: PMC10536866 DOI: 10.1021/acsomega.3c04525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Accepted: 08/31/2023] [Indexed: 10/03/2023]
Abstract
The electrochemical chlorine evolution reaction (CER) is one of the most important electrochemical reactions. Typically, iridium (Ir)- or ruthenium (Ru)-based mixed metal oxides have been used as electrocatalysts for the CER due to their high activities and durabilities. However, the scarcity of Ir and Ru has indicated the need to develop alternative earth-abundant transition-metal-based CER catalysts. In this study, we report a Co3O4 nanoparticle (NP) catalyst synthesized by a hydrothermal method. Furthermore, Ru was successfully incorporated into the Co3O4 NPs (RuxCo3-xO4 NPs) for further improvement of catalytic performance in chlorine generation. Electrokinetic analyses combined with in situ X-ray absorption near-edge structure (XANES) results suggested an identical CER mechanism for the Co3O4 NPs and RuxCo3-xO4 NPs. Various characterization techniques demonstrated that the homogeneous substitution of Ru4+ ions into the Co3+ octahedral sites enhanced the structural disorder and changed the electronic state of Co3O4, resulting in additional exposed active sites. Remarkably, the Ru0.09Co2.91O4 NP electrode exhibited outstanding stability for more than 150 h even at a high current density of 500 mA/cm2, which shows its commercial viability for active chlorine generation.
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Affiliation(s)
- Won Il Choi
- Department
of Materials Science and Engineering, Seoul
National University, 1 Gwanak-ro, Seoul 08826, Republic of Korea
| | - Seungwoo Choi
- Department
of Materials Science and Engineering, Seoul
National University, 1 Gwanak-ro, Seoul 08826, Republic of Korea
- Soft
Foundry, Seoul National University, 1 Gwanak-ro, Seoul 08826, Republic of Korea
| | - Mani Balamurugan
- Department
of Materials Science and Engineering, Seoul
National University, 1 Gwanak-ro, Seoul 08826, Republic of Korea
- Soft
Foundry, Seoul National University, 1 Gwanak-ro, Seoul 08826, Republic of Korea
| | - Sunghak Park
- Department
of Materials Science and Engineering, Seoul
National University, 1 Gwanak-ro, Seoul 08826, Republic of Korea
| | - Kang Hee Cho
- Department
of Materials Science and Engineering, Seoul
National University, 1 Gwanak-ro, Seoul 08826, Republic of Korea
| | - Hongmin Seo
- Department
of Materials Science and Engineering, Seoul
National University, 1 Gwanak-ro, Seoul 08826, Republic of Korea
| | - Heonjin Ha
- Department
of Materials Science and Engineering, Seoul
National University, 1 Gwanak-ro, Seoul 08826, Republic of Korea
| | - Ki Tae Nam
- Department
of Materials Science and Engineering, Seoul
National University, 1 Gwanak-ro, Seoul 08826, Republic of Korea
- Soft
Foundry, Seoul National University, 1 Gwanak-ro, Seoul 08826, Republic of Korea
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Song I, Eom Y, P MA, Hong DH, Balamurugan M, Boppella R, Kim DH, Kim TK. Geometric and Electronic Structural Engineering of Isolated Ni Single Atoms for a Highly Efficient CO 2 Electroreduction. Small 2023:e2300049. [PMID: 37058139 DOI: 10.1002/smll.202300049] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 03/21/2023] [Indexed: 06/19/2023]
Abstract
Tuning the coordination environment and geometric structures of single atom catalysts is an effective approach for regulating the reaction mechanism and maximize the catalytic efficiency of single-atom centers. Here, a template-based synthesis strategy is proposed for the synthesis of high-density NiNx sites anchored on the surface of hierarchically porous nitrogen-doped carbon nanofibers (Ni-HPNCFs) with different coordination environments. First-principles calculations and advanced characterization techniques demonstrate that the single Ni atom is strongly coordinated with both pyrrolic and pyridinic N dopants, and that the predominant sites are stabilized by NiN3 sites. This dual engineering strategy increases the number of active sites and utilization efficiency of each single atom as well as boosts the intrinsic activity of each active site on a single-atom scale. Notably, the Ni-HPNCF catalyst achieves a high CO Faradaic efficiency (FECO ) of 97% at a potential of -0.7 V, a high CO partial current density (jCO ) of 49.6 mA cm-2 (-1.0 V), and a remarkable turnover frequency of 24 900 h-1 (-1.0 V) for CO2 reduction reactions (CO2 RR). Density functional theory calculations show that compared to pyridinic-type NiNx , the pyrrolic-type NiN3 moieties display a superior CO2 RR activity over hydrogen evolution reactions, resulting in their superior catalytic activity and selectivity.
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Affiliation(s)
- Inae Song
- Department of Chemistry, Yonsei University, Seoul, 03722, Republic of Korea
| | - Yaeeun Eom
- Department of Chemistry, Yonsei University, Seoul, 03722, Republic of Korea
| | - Muthu Austeria P
- Division of Science Education, Graduate School of Department of Energy Storage/Conversion Engineering, Jeonbuk National University Jeonju, Jeonbuk, 54896, Republic of Korea
| | - Da Hye Hong
- Department of Chemistry, Yonsei University, Seoul, 03722, Republic of Korea
| | - Mani Balamurugan
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Ramireddy Boppella
- Department of Chemistry, Yonsei University, Seoul, 03722, Republic of Korea
- Department of Mechanical Engineering, Colorado State University, Fort Collins, CO, 80526, USA
| | - Do Hwan Kim
- Division of Science Education, Graduate School of Department of Energy Storage/Conversion Engineering, Jeonbuk National University Jeonju, Jeonbuk, 54896, Republic of Korea
| | - Tae Kyu Kim
- Department of Chemistry, Yonsei University, Seoul, 03722, Republic of Korea
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6
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Senkamalavalli R, Balamurugan M, Sundara RN, Ramshankar N. Improved classification of breast cancer data using hybrid techniques. CM 2023. [DOI: 10.18137/cardiometry.2023.26.487490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023] Open
Abstract
Breast cancer is the second leading cancer for women in developed countries including India. Many new cancer detection and treatment approaches were developed. The most effective way to reduce breast cancer deaths is detect it earlier. The frequent occurrence of breast cancer and its serious consequences have attracted world wide attention in recent years. Problems such as low rate of accuracy and poor self-adaptability still exist in traditional diagnosis. In order to solve these problems, an Ada Boost-SVM classification algorithm, Combined with k-means is proposed in this research for the early diagnosis of breast cancer. The effectiveness of the proposed methods are examined by calculating its accuracy, confusion matrix which give important clues to the physicians for early diagnosis of breast cancer
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Udendhran R, Balamurugan M. Retraction Note: Towards secure deep learning architecture for smart farming-based applications. COMPLEX INTELL SYST 2022. [DOI: 10.1007/s40747-022-00935-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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8
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Rajeev A, Balamurugan M, Sankaralingam M. Rational Design of First-Row Transition Metal Complexes as the Catalysts for Oxidation of Arenes: A Homogeneous Approach. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01928] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anjana Rajeev
- Bioinspired & Biomimetic Inorganic Chemistry Lab, Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala 673601, India
| | - Mani Balamurugan
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Muniyandi Sankaralingam
- Bioinspired & Biomimetic Inorganic Chemistry Lab, Department of Chemistry, National Institute of Technology Calicut, Kozhikode, Kerala 673601, India
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Patnam S, Samal R, Koyyada R, Joshi P, Singh AD, Nagalla B, Soma MR, Sannareddy RR, Ippili K, Raju S, Boola RG, Lath R, Ranjan A, Ghosh S, Balamurugan M, Ray A, Manda SV. Exosomal PTEN as a Predictive Marker of Aggressive Gliomas. Neurol India 2022; 70:215-222. [PMID: 35263886 DOI: 10.4103/0028-3886.338731] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
BACKGROUND Liquid biopsies have emerged as convenient alternative diagnostic methods to invasive biopsies, by evaluating disease-specific biomarkers and monitoring the disease risk noninvasively. Phosphatase and tensin homolog deleted in chromosome 10 (PTEN) is a potent tumor suppressor, and its deletion/mutations are common in gliomas. OBJECTIVE Evaluate the feasibility of non-invasive detection of PTEN and its downstream genes in serum exosomes of glioma patients. MATERIALS AND METHODS PTEN, Yes-associated-protein 1 (YAP1), and lysyl oxidase (LOX) transcript expression were monitored through polymerase chain reaction (PCR) in serum exosomes and their paired tumor tissues. The impact of PTEN and its axis genes expression on the overall survival (OS) was monitored. RESULTS Out of the 106 glioma serum samples evaluated, PTEN was retained/lost in 65.4%/34.6% of the tumor samples while it was retained/lost in 67.1%/32.9% of their paired exosomal fractions. PTEN expression in both tissue and paired exosomal fractions was observed in 48.11% of the samples. Sanger sequencing detected three mutations (Chr10: 89720791(A>G), Chr10:89720749(C>T), and Chr10:89720850(A>G). Both PTEN-responsive downstream genes (YAP1) and LOX axis were upregulated in the PTEN-deficient samples. PTEN loss was associated with poor survival in the glioma patients (hazard ratio (HR) 0.68, confidence interval (CI): 0.35-1.31, P = 0.28). The OS of the exosomal PTEN cohort coincided with the tumor-tissue PTEN devoid group (HR 1.08, CI: 0.49-2.36, P = 0.85). While, old age yielded the worst prognosis; gender, location, and grade were not prognostic of OS in the multivariate analysis. CONCLUSIONS PTEN and its responsive genes YAP1 and LOX can be detected in serum exosomes and can serve as essential tools for the non-invasive evaluation/identification of aggressive gliomas.
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Affiliation(s)
- Sreekanth Patnam
- Apollo Hospitals Educational and Research Foundation (AHERF), Hyderabad; Indian Institute of Technology Hyderabad (IITH), Sangareddy, Telangana, India
| | - Rasmita Samal
- Apollo Hospitals Educational and Research Foundation (AHERF), Hyderabad, Telangana; Central University of Karnataka, Kadaganchi, Karnataka, India
| | - Rajeswari Koyyada
- Apollo Hospitals Educational and Research Foundation (AHERF), Hyderabad, Telangana, India
| | - Partha Joshi
- Department of Neurosurgery, Apollo Hospitals, Hyderabad, Telangana, India
| | - Anula D Singh
- Apollo Hospitals Educational and Research Foundation (AHERF), Hyderabad; Indian Institute of Technology Hyderabad (IITH), Sangareddy, Telangana, India
| | - Balakrishna Nagalla
- Apollo Institute of Medical Sciences and Research, Hyderabad, Telangana, India
| | - Madan R Soma
- Department of Neurosurgery, Apollo Hospitals, Hyderabad, Telangana, India
| | | | - Kaushal Ippili
- Department of Neurosurgery, Apollo Hospitals, Hyderabad, Telangana, India
| | - Subodh Raju
- Department of Neurosurgery, Apollo Hospitals, Hyderabad, Telangana, India
| | - Ratnam G Boola
- Department of Neurosurgery, Apollo Hospitals, Hyderabad, Telangana, India
| | - Rahul Lath
- Department of Neurosurgery, Apollo Hospitals, Hyderabad, Telangana, India
| | - Alok Ranjan
- Department of Neurosurgery, Apollo Hospitals, Hyderabad, Telangana, India
| | - Siddharth Ghosh
- Apollo Institute of Medical Sciences and Research, Hyderabad, Telangana, India
| | - M Balamurugan
- Department of Neurosurgery, Apollo Hospitals, Chennai, Tamil Nadu, India
| | - Amitava Ray
- Department of Neurosurgery, Apollo Hospitals, Hyderabad, Telangana, India
| | - Sasidhar V Manda
- Apollo Hospitals Educational and Research Foundation (AHERF); Urvogelbio Pvt Ltd, Hyderabad, Telangana, India
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Kim JE, Jang JH, Lee KM, Balamurugan M, Jo YI, Lee MY, Choi S, Im SW, Nam KT. Electrochemical Synthesis of Glycine from Oxalic Acid and Nitrate. Angew Chem Int Ed Engl 2021; 60:21943-21951. [PMID: 34324785 DOI: 10.1002/anie.202108352] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Indexed: 11/05/2022]
Abstract
In manufacturing C-N bond-containing compounds, it is an important challenge to alternate the conventional methodologies that utilize reactive substrates, toxic reagents, and organic solvents. In this study, we developed an electrochemical method to synthesize a C-N bond-containing molecule avoiding the use of cyanides and amines by harnessing nitrate (NO3 - ) as a nitrogen source in an aqueous electrolyte. In addition, we utilized oxalic acid as a carbon source, which can be obtained from electrochemical conversion of CO2. Thus, our approach can provide a route for the utilization of anthropogenic CO2 and nitrate wastes, which cause serious environmental problems including global warming and eutrophication. Interestingly, the coreduction of oxalic acid and nitrate generated reactive intermediates, which led to C-N bond formation followed by further reduction to an amino acid, namely, glycine. By carefully controlling this multireduction process with a fabricated Cu-Hg electrode, we demonstrated the efficient production of glycine with a faradaic efficiency (F.E.) of up to 43.1 % at -1.4 V vs. Ag/AgCl (current density≈90 mA cm-2 ).
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Affiliation(s)
- Jeong Eun Kim
- Department of Materials Science and Engineering, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Jun Ho Jang
- Department of Materials Science and Engineering, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Kyu Min Lee
- Department of Materials Science and Engineering, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Mani Balamurugan
- Department of Materials Science and Engineering, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Young In Jo
- Department of Materials Science and Engineering, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Moo Young Lee
- Department of Materials Science and Engineering, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Seungwoo Choi
- Department of Materials Science and Engineering, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Sang Won Im
- Department of Materials Science and Engineering, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea
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Kim JE, Jang JH, Lee KM, Balamurugan M, Jo YI, Lee MY, Choi S, Im SW, Nam KT. Electrochemical Synthesis of Glycine from Oxalic Acid and Nitrate. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202108352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jeong Eun Kim
- Department of Materials Science and Engineering Seoul National University Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea
| | - Jun Ho Jang
- Department of Materials Science and Engineering Seoul National University Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea
| | - Kyu Min Lee
- Department of Materials Science and Engineering Seoul National University Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea
| | - Mani Balamurugan
- Department of Materials Science and Engineering Seoul National University Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea
| | - Young In Jo
- Department of Materials Science and Engineering Seoul National University Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea
| | - Moo Young Lee
- Department of Materials Science and Engineering Seoul National University Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea
| | - Seungwoo Choi
- Department of Materials Science and Engineering Seoul National University Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea
| | - Sang Won Im
- Department of Materials Science and Engineering Seoul National University Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering Seoul National University Gwanak-ro, Gwanak-gu Seoul 08826 Republic of Korea
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Balamurugan M, Suresh E, Palaniandavar M. μ-Oxo-bridged diiron(iii) complexes of tripodal 4N ligands as catalysts for alkane hydroxylation reaction using m-CPBA as an oxidant: substrate vs. self hydroxylation. RSC Adv 2021; 11:21514-21526. [PMID: 35478792 PMCID: PMC9034113 DOI: 10.1039/d1ra03135j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Accepted: 05/28/2021] [Indexed: 11/23/2022] Open
Abstract
A series of non-heme μ-oxo-bridged dinuclear iron(iii) complexes of the type [Fe2(μ-O)(L1–L6)2Cl2]Cl21–6 have been isolated and their catalytic activity towards oxidative transformation of alkanes into alcohols has been studied using m-choloroperbenzoic acid (m-CPBA) as an oxidant. All the complexes were characterized by CHN, electrochemical, and UV-visible spectroscopic techniques. The molecular structures of 2 and 5 have been determined successfully by single crystal X-ray diffraction analysis and both possesses octahedral coordination geometry and each iron atom is coordinated by four nitrogen atoms of the 4N ligand and a bridging oxygen. The sixth position of each octahedron is coordinated by a chloride ion. The (μ-oxo)diiron(iii) core is linear in 2 (Fe–O–Fe, 180.0°), whereas it is non-linear (Fe–O–Fe, 161°) in 5. All the diiron(iii) complexes show quasi-reversible one electron transfer in the cyclic voltammagram and catalyze the hydroxylation of alkanes like cyclohexane, adamantane with m-CPBA as an oxidant. In acetonitrile solution, adding excess m-CPBA to the diiron(iii) complex 2 without chloride ions leads to intramolecular hydroxylation reaction of the oxidant. Interestingly, 2 catalyzes alkane hydroxylation in the presence of chloride ions, but intramolecular hydroxylation in the absence of chloride ions. The observed selectivity for cyclohexane (A/K, 5–7) and adamantane (3°/2°, 9–18) suggests the involvement of high-valent iron–oxo species rather than freely diffusing radicals in the catalytic reaction. Moreover, 4 oxidizes (A/K, 7) cyclohexane very efficiently up to 513 TON while 5 oxidizes adamantane with good selectivity (3°/2°, 18) using m-CPBA as an oxidant. The electronic effects of ligand donors dictate the efficiency and selectivity of catalytic hydroxylation of alkanes. The ligand stereoelectronic effect of diiron(iii) complexes determines the efficiency and selectivity of catalytic alkane hydroxylation with m-CPBA as an oxidant.![]()
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Affiliation(s)
- Mani Balamurugan
- School of Chemistry, Bharathidasan University Tiruchirappalli 620 024 Tamil Nadu India
| | - Eringathodi Suresh
- Analytical Science Discipline, Central Salt and Marine Chemicals Research Institute Bhavnagar 364 002 India
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Saravanan N, Balamurugan M, Shalini Devi KS, Nam KT, Senthil Kumar A. Vitamin B12-Immobilized Graphene Oxide for Efficient Electrocatalytic Carbon Dioxide Reduction Reaction. ChemSusChem 2020; 13:5620-5624. [PMID: 32946198 DOI: 10.1002/cssc.202001378] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 08/31/2020] [Indexed: 05/14/2023]
Abstract
A naturally occurring water-soluble cobalt-complex cyanocobalamin (Vitamin B12) has been identified as a new and efficient electrocatalyst for the CO2 -to-CO reduction reaction in aqueous solution. Heterogeneous B12-electrocatalysts prepared by a simple electrochemical immobilization technique on graphene-oxide (GO)-modified glassy carbon and carbon paper (CP) electrodes, without any non-degradable polymer-binders, showed a highly stable and well-defined surface-confined redox peak at E'=-0.138 V vs. RHE with a surface-excess value, ΓB12 =4.28 nmol cm-2 . This new electrocatalyst exhibits 93 % Faradaic efficiency for CO2 -to-CO conversion at an electrolysis potential, -0.882 V vs. RHE (an optimal condition) with a high current density, 29.4 mA cm-2 and turn-over-frequency value, 5.2 s-1 , without any surface-fouling problem, in 0.5 m KHCO3 . In further, it follows an eco-friendly, sustainable and water-based approach with the involvement of biodegradable and non-toxic chemicals/materials like B12, GO and CP.
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Affiliation(s)
- Natarajan Saravanan
- Nano and Bioelectrochemistry Research Laboratory, Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology University, Vellore, 632 014, India
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Mani Balamurugan
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - K S Shalini Devi
- Nano and Bioelectrochemistry Research Laboratory, Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology University, Vellore, 632 014, India
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Annamalai Senthil Kumar
- Carbon Dioxide Research and Green Technology Centre, Vellore Institute of Technology University, Vellore, 632 014, India
- Nano and Bioelectrochemistry Research Laboratory, Department of Chemistry, School of Advanced Sciences, Vellore Institute of Technology University, Vellore, 632 014, India
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15
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Balamurugan M, Jeong HY, Choutipalli VSK, Hong JS, Seo H, Saravanan N, Jang JH, Lee KG, Lee YH, Im SW, Subramanian V, Kim SH, Nam KT. Electrocatalytic Reduction of CO 2 to Ethylene by Molecular Cu-Complex Immobilized on Graphitized Mesoporous Carbon. Small 2020; 16:e2000955. [PMID: 32468643 DOI: 10.1002/smll.202000955] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Revised: 04/17/2020] [Accepted: 04/26/2020] [Indexed: 06/11/2023]
Abstract
The electrochemical reduction of carbon dioxide (CO2 ) to hydrocarbons is a challenging task because of the issues in controlling the efficiency and selectivity of the products. Among the various transition metals, copper has attracted attention as it yields more reduced and C2 products even while using mononuclear copper center as catalysts. In addition, it is found that reversible formation of copper nanoparticle acts as the real catalytically active site for the conversion of CO2 to reduced products. Here, it is demonstrated that the dinuclear molecular copper complex immobilized over graphitized mesoporous carbon can act as catalysts for the conversion of CO2 to hydrocarbons (methane and ethylene) up to 60%. Interestingly, high selectivity toward C2 product (40% faradaic efficiency) is achieved by a molecular complex based hybrid material from CO2 in 0.1 m KCl. In addition, the role of local pH, porous structure, and carbon support in limiting the mass transport to achieve the highly reduced products is demonstrated. Although the spectroscopic analysis of the catalysts exhibits molecular nature of the complex after 2 h bulk electrolysis, morphological study reveals that the newly generated copper cluster is the real active site during the catalytic reactions.
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Affiliation(s)
- Mani Balamurugan
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Seoul, 08826, Republic of Korea
| | - Hui-Yun Jeong
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Seoul, 08826, Republic of Korea
| | - Venkata Surya Kumar Choutipalli
- Inorganic and Physical Chemistry Laboratory, CSIR-Central Leather Research Institute, Adyar, Chennai, 600 020, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-CLRI Campus, Chennai, 600020, India
| | - Jung Sug Hong
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Seoul, 08826, Republic of Korea
| | - Hongmin Seo
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Seoul, 08826, Republic of Korea
| | - Natarajan Saravanan
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Seoul, 08826, Republic of Korea
| | - Jun Ho Jang
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Seoul, 08826, Republic of Korea
| | - Kang-Gyu Lee
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Seoul, 08826, Republic of Korea
| | - Yoon Ho Lee
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Seoul, 08826, Republic of Korea
| | - Sang Won Im
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Seoul, 08826, Republic of Korea
| | - Venkatesan Subramanian
- Inorganic and Physical Chemistry Laboratory, CSIR-Central Leather Research Institute, Adyar, Chennai, 600 020, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-CLRI Campus, Chennai, 600020, India
| | - Sun Hee Kim
- Western Seoul Center, Korea Basic Science Institute (KBSI), 150, Bukahyeon-ro, Seodaemun-gu, Seoul, 120-140, Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Seoul, 08826, Republic of Korea
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16
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Choi S, Balamurugan M, Lee KG, Cho KH, Park S, Seo H, Nam KT. Mechanistic Investigation of Biomass Oxidation Using Nickel Oxide Nanoparticles in a CO 2-Saturated Electrolyte for Paired Electrolysis. J Phys Chem Lett 2020; 11:2941-2948. [PMID: 32223169 DOI: 10.1021/acs.jpclett.0c00425] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A highly efficient CO2 electrolysis system could be created by introducing biomass oxidation as an alternative anodic reaction to the sluggish oxygen evolution reaction in a CO2-saturated and near-neutral electrolyte. Here, we successfully demonstrate anodic biomass oxidation by synthesizing 5 nm nickel oxide nanoparticles (NiO NPs). NiO NPs show a unique electrocatalytic activity for 5-hydroxymethylfurfural (HMF) oxidation under near-neutral conditions, exhibiting an anodic current onset (1 mA cm-2) at 1.524 V versus the reversible hydrogen electrode and a total Faradaic efficiency of ≤70%. Electrokinetic and in situ ultraviolet-visible spectroscopic analyses suggest that a redox active nickel hydroxide species is formed on the surface of NiO electrocatalysts during HMF oxidation, and this oxidation of Ni(II) hydroxide to Ni(III) oxyhydroxide could be the rate-determining step. This mechanistic study of biomass oxidation in a CO2-saturated electrolyte provides insight into constructing a highly efficient system for the paired electrolysis of CO2 reduction and biomass oxidation.
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Affiliation(s)
- Seungwoo Choi
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Mani Balamurugan
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Kang-Gyu Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Kang Hee Cho
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Sunghak Park
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Hongmin Seo
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea
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17
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Kim Y, Park GD, Balamurugan M, Seo J, Min BK, Nam KT. Electrochemical β-Selective Hydrocarboxylation of Styrene Using CO 2 and Water. Adv Sci (Weinh) 2020; 7:1900137. [PMID: 32042549 PMCID: PMC7001630 DOI: 10.1002/advs.201900137] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 11/12/2019] [Indexed: 06/10/2023]
Abstract
The carboxylation of hydrocarbons using CO2 as a one-carbon building block is an attractive route for the synthesis of carboxylic acids and their derivatives. Until now, chemical carboxylation catalyzed by organometallic nucleophiles and reductants has been generally adopted particularly for the precise selectivity control of carboxylation sites. As another approach, electrochemical carboxylation has been attempted but these carboxylation reactions are limited to only a few pathways. In the case of styrene, dicarboxylation at the α- and β-positions is mostly observed with electrochemical carboxylation while site-selective hydrocarboxylations are hardly achieved. In this study, electrochemical β-selective hydrocarboxylation of styrene using CO2 and water is developed, in which the site selectivity can be precisely controlled between β-hydrocarboxylation and dicarboxylation without the aid of homogeneous catalysts. In this platform, water is used as proton source in the β-hydrocarboxylation of styrene where its addition results in significant enhancement of the selectivity toward β-hydrocarboxylation. This work provides insights into new strategies for site-selectivity-controllable carboxylation with CO2 using an electrochemical platform.
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Affiliation(s)
- Younghye Kim
- Department of Materials Science and EngineeringSeoul National UniversitySeoul151‐744Republic of Korea
- Clean Energy Research CenterKorea Institute of Science and Technology5 Hwarang‐ro 14‐gil, Seongbuk‐guSeoul02792Republic of Korea
| | - Gyeong Do Park
- Department of Materials Science and EngineeringSeoul National UniversitySeoul151‐744Republic of Korea
| | - Mani Balamurugan
- Department of Materials Science and EngineeringSeoul National UniversitySeoul151‐744Republic of Korea
| | - Jiwon Seo
- Department of ChemistrySchool of Physics and ChemistryGwangju Institute of Science and TechnologyGwangju61005Republic of Korea
| | - Byoung Koun Min
- Clean Energy Research CenterKorea Institute of Science and Technology5 Hwarang‐ro 14‐gil, Seongbuk‐guSeoul02792Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and EngineeringSeoul National UniversitySeoul151‐744Republic of Korea
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18
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Abstract
Plasmonic metamaterials are artificially designed materials which exhibit optical properties that cannot be found in nature. They have unique and special abilities related to electromagnetic wave control, including strong field enhancement in the vicinity of the surfaces. Over the years, scientists have succeeded in dramatically improving the detection limit of molecular chirality utilizing a variety of plasmonic metamaterial platforms. In this mini-review, we will discuss the principles of most recent issues in chiral sensing applications of plasmonic metamaterials, including suggested formulas for signal enhancement of chiroptical plasmonic sensors, and studies on various platforms that employ different sensing mechanisms.
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Affiliation(s)
- Yoon Young Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Ryeong Myeong Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Sang Won Im
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Mani Balamurugan
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
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19
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Ju M, Cho OH, Lee J, Namgung SD, Song MK, Balamurugan M, Kwon JY, Nam KT. Quantitative analysis of the coupling between proton and electron transport in peptide/manganese oxide hybrid films. Phys Chem Chem Phys 2020; 22:7537-7545. [DOI: 10.1039/c9cp05581a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A novel platform is proposed to quantify the coupling phenomenon between electrons and protons in tyrosine-rich peptide/manganese oxide hybrid films at room temperature.
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Affiliation(s)
- Misong Ju
- Department of Materials Science and Engineering
- Seoul National University
- Seoul
- South Korea
| | - Ouk Hyun Cho
- Department of Materials Science and Engineering
- Seoul National University
- Seoul
- South Korea
| | - Jaehun Lee
- Department of Materials Science and Engineering
- Seoul National University
- Seoul
- South Korea
| | - Seok Daniel Namgung
- School of Integrated Technology
- Yonsei University
- Incheon
- South Korea
- Yonsei Institute of Convergence Technology
| | - Min-Kyu Song
- School of Integrated Technology
- Yonsei University
- Incheon
- South Korea
- Yonsei Institute of Convergence Technology
| | - Mani Balamurugan
- Department of Materials Science and Engineering
- Seoul National University
- Seoul
- South Korea
| | - Jang-Yeon Kwon
- School of Integrated Technology
- Yonsei University
- Incheon
- South Korea
- Yonsei Institute of Convergence Technology
| | - Ki Tae Nam
- Department of Materials Science and Engineering
- Seoul National University
- Seoul
- South Korea
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20
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Kandasamy S, Jeyakumari D, Premalatha E, Srirangaramasamy J, Balamurugan M. Seroprevalence of Rubella Immunity (IgG Antibody) among Female Health Care Workers in a Hospital in Southern India. J Clin Diagn Res 2019. [DOI: 10.7860/jcdr/2019/40961.12996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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21
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Jeong H, Balamurugan M, Choutipalli VSK, Jo J, Baik H, Subramanian V, Kim M, Sim U, Nam KT. Frontispiece: Tris(2‐benzimidazolylmethyl)amine‐Directed Synthesis of Single‐Atom Nickel Catalysts for Electrochemical CO Production from CO
2. Chemistry 2018. [DOI: 10.1002/chem.201886963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hui‐Yun Jeong
- Department of Materials Science and EngineeringSeoul National University Seoul 08826 Republic of Korea
| | - Mani Balamurugan
- Department of Materials Science and EngineeringSeoul National University Seoul 08826 Republic of Korea
| | - Venkata Surya Kumar Choutipalli
- Inorganic and Physical Chemistry LaboratoryCSIR-Central Leather Research Institute Adyar Chennai 600020 India
- Academy of Scientific and Innovative Research (AcSIR) CSIR-CLRI Campus Chennai 600020 India
| | - Janghyun Jo
- Department of Materials Science and EngineeringSeoul National University Seoul 08826 Republic of Korea
| | - Hionsuck Baik
- Seoul Center of Analytical ResearchKorea Basic Science Institute Anam-ro 145, Seongbuk-gu Seoul 136713 Republic of Korea
| | - Venkatesan Subramanian
- Inorganic and Physical Chemistry LaboratoryCSIR-Central Leather Research Institute Adyar Chennai 600020 India
- Academy of Scientific and Innovative Research (AcSIR) CSIR-CLRI Campus Chennai 600020 India
| | - Miyoung Kim
- Department of Materials Science and EngineeringSeoul National University Seoul 08826 Republic of Korea
| | - Uk Sim
- Department of Materials Science and EngineeringChonnam National University Gwangju 61186 Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and EngineeringSeoul National University Seoul 08826 Republic of Korea
- Research Institute of Advanced Materials Seoul 08826 Republic of Korea
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22
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Jeong HY, Balamurugan M, Choutipalli VSK, Jo J, Baik H, Subramanian V, Kim M, Sim U, Nam KT. Tris(2-benzimidazolylmethyl)amine-Directed Synthesis of Single-Atom Nickel Catalysts for Electrochemical CO Production from CO 2. Chemistry 2018; 24:18444-18454. [PMID: 30133021 DOI: 10.1002/chem.201803615] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2018] [Revised: 08/16/2018] [Indexed: 12/14/2022]
Abstract
The electrochemical reduction of carbon dioxide (CO2 ) to value-added products is a promising approach to reducing excess CO2 in the atmosphere. However, the development of electrocatalysts for highly selective and efficient electrochemical CO2 reduction has been challenging because protons are usually easier to reduce than CO2 in an aqueous electrolyte. Recently, single-atom catalysts (SACs) have been suggested as candidate CO2 reduction catalysts due to their unique catalytic properties. To prepare single-atom metal active sites, the stabilization of metal atoms over conductive supports such as graphene sheets to prevent metal aggregation is crucial. To address this issue, a facile method was developed to prepare single-atom nickel active sites on reduced graphene oxide (RGO) sheets for the selective production of carbon monoxide (CO) from CO2 . The tris(2-benzimidazolylmethyl)amine (NTB) ligand was introduced as a linker that can homogeneously disperse nickel atoms on the graphene oxide (GO) sheets. Because the NTB ligands form strong interactions with the GO sheets by π-π interactions and with nickel ions by ligation, they can effectively stabilize nickel ions on GO sheets by forming Ni(NTB)-GO complexes. High-temperature annealing of Ni(NTB)-GO under inert atmosphere produces nickel- and nitrogen-doped reduced graphene oxide sheets (Ni-N-RGO) with single-atom Ni-N4 active sites. Ni-N-RGO shows high CO2 reduction selectivity in the reduction of CO2 to CO with 97 % faradaic efficiency at -0.8 V vs. RHE (reversible hydrogen electrode).
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Affiliation(s)
- Hui-Yun Jeong
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Mani Balamurugan
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Venkata Surya Kumar Choutipalli
- Inorganic and Physical Chemistry Laboratory, CSIR-Central Leather Research Institute, Adyar, Chennai, 600020, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-CLRI Campus, Chennai, 600020, India
| | - Janghyun Jo
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Hionsuck Baik
- Seoul Center of Analytical Research, Korea Basic Science Institute, Anam-ro 145, Seongbuk-gu, Seoul, 136713, Republic of Korea
| | - Venkatesan Subramanian
- Inorganic and Physical Chemistry Laboratory, CSIR-Central Leather Research Institute, Adyar, Chennai, 600020, India.,Academy of Scientific and Innovative Research (AcSIR), CSIR-CLRI Campus, Chennai, 600020, India
| | - Miyoung Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea
| | - Uk Sim
- Department of Materials Science and Engineering, Chonnam National University, Gwangju, 61186, Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea.,Research Institute of Advanced Materials, Seoul, 08826, Republic of Korea
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Balamurugan M, Saravanan N, Ha H, Lee YH, Nam KT. Involvement of high-valent manganese-oxo intermediates in oxidation reactions: realisation in nature, nano and molecular systems. Nano Converg 2018; 5:18. [PMID: 30101051 PMCID: PMC6061251 DOI: 10.1186/s40580-018-0150-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 06/19/2018] [Indexed: 05/12/2023]
Abstract
Manganese plays multiple role in many biological redox reactions in which it exists in different oxidation states from Mn(II) to Mn(IV). Among them the high-valent manganese-oxo intermediate plays important role in the activity of certain enzymes and lessons from the natural system provide inspiration for new developments of artificial systems for a sustainable energy supply and various organic conversions. This review describes recent advances and key lessons learned from the nature on high-valent Mn-oxo intermediates. Also we focus on the elemental science developed from the natural system, how the novel strategies are realised in nano particles and molecular sites at heterogeneous and homogeneous reaction conditions respectively. Finally, perspectives on the utilisation of the high-valent manganese-oxo species towards other organic reactions are proposed.
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Affiliation(s)
- Mani Balamurugan
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744 South Korea
| | - Natarajan Saravanan
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744 South Korea
| | - Heonjin Ha
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744 South Korea
| | - Yoon Ho Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744 South Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744 South Korea
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24
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Jin K, Seo H, Hayashi T, Balamurugan M, Jeong D, Go YK, Hong JS, Cho KH, Kakizaki H, Bonnet-Mercier N, Kim MG, Kim SH, Nakamura R, Nam KT. Mechanistic Investigation of Water Oxidation Catalyzed by Uniform, Assembled MnO Nanoparticles. J Am Chem Soc 2017; 139:2277-2285. [PMID: 28029792 DOI: 10.1021/jacs.6b10657] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The development of active water oxidation catalysts is critical to achieve high efficiency in overall water splitting. Recently, sub-10 nm-sized monodispersed partially oxidized manganese oxide nanoparticles were shown to exhibit not only superior catalytic performance for oxygen evolution, but also unique electrokinetics, as compared to their bulk counterparts. In the present work, the water-oxidizing mechanism of partially oxidized MnO nanoparticles was investigated using integrated in situ spectroscopic and electrokinetic analyses. We successfully demonstrated that, in contrast to previously reported manganese (Mn)-based catalysts, Mn(III) species are stably generated on the surface of MnO nanoparticles via a proton-coupled electron transfer pathway. Furthermore, we confirmed as to MnO nanoparticles that the one-electron oxidation step from Mn(II) to Mn(III) is no longer the rate-determining step for water oxidation and that Mn(IV)═O species are generated as reaction intermediates during catalysis.
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Affiliation(s)
- Kyoungsuk Jin
- Department of Materials Science and Engineering, Seoul National University , Seoul 151-742, Korea
| | - Hongmin Seo
- Department of Materials Science and Engineering, Seoul National University , Seoul 151-742, Korea
| | - Toru Hayashi
- Department of Applied Chemistry, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.,Biofunctional Catalyst Research Team, RIKEN Center for Sustainable Resource Science (CSRS) , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Mani Balamurugan
- Department of Materials Science and Engineering, Seoul National University , Seoul 151-742, Korea
| | - Donghyuk Jeong
- Western Seoul Center, Korea Basic Science Institute (KBSI) , 150, Bukahyeon-ro, Seodaemun-gu, Seoul 120-140, Korea
| | - Yoo Kyung Go
- Western Seoul Center, Korea Basic Science Institute (KBSI) , 150, Bukahyeon-ro, Seodaemun-gu, Seoul 120-140, Korea
| | - Jung Sug Hong
- Department of Materials Science and Engineering, Seoul National University , Seoul 151-742, Korea
| | - Kang Hee Cho
- Department of Materials Science and Engineering, Seoul National University , Seoul 151-742, Korea
| | - Hirotaka Kakizaki
- Department of Applied Chemistry, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.,Biofunctional Catalyst Research Team, RIKEN Center for Sustainable Resource Science (CSRS) , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Nadège Bonnet-Mercier
- Biofunctional Catalyst Research Team, RIKEN Center for Sustainable Resource Science (CSRS) , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Min Gyu Kim
- Pohang Accelerator Laboratory, Pohang University of Science and Technology (POSTECH) , Pohang 790-784, Korea
| | - Sun Hee Kim
- Western Seoul Center, Korea Basic Science Institute (KBSI) , 150, Bukahyeon-ro, Seodaemun-gu, Seoul 120-140, Korea
| | - Ryuhei Nakamura
- Biofunctional Catalyst Research Team, RIKEN Center for Sustainable Resource Science (CSRS) , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University , Seoul 151-742, Korea
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25
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Kasiviswanathan KS, Saravanan S, Balamurugan M, Saravanan K. Genetic programming based monthly groundwater level forecast models with uncertainty quantification. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/s40808-016-0083-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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26
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Balamurugan M, Suresh E, Palaniandavar M. Non-heme μ-Oxo- and bis(μ-carboxylato)-bridged diiron(iii) complexes of a 3N ligand as catalysts for alkane hydroxylation: stereoelectronic factors of carboxylate bridges determine the catalytic efficiency. Dalton Trans 2016; 45:11422-36. [DOI: 10.1039/c6dt01059h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The stereoelectronic factors of carboxylate bridges in diiron(iii) complexes determine the efficiency of catalytic alkane hydroxylation with m-CPBA.
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Affiliation(s)
- Mani Balamurugan
- School of Chemistry
- Bharathidasan University
- Tiruchirappalli - 620024
- India
| | - Eringathodi Suresh
- Analytical Science Discipline
- Central Salt and Marine Chemicals Research Institute
- Bhavnagar - 364 002
- India
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27
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Vijaykumar S, Saravanakumar SG, Balamurugan M. Unique Sense: Smart Computing Prototype for Industry 4.0 Revolution with IOT and Bigdata Implementation Model. ACTA ACUST UNITED AC 2015. [DOI: 10.17485/ijst/2015/v8i35/86698] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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28
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Gupta AK, Batra P, Mathur P, Karoung A, Thanbuana B, Thomas S, Balamurugan M, Gunjiyal J, Misra MC. Microbial epidemiology and antimicrobial susceptibility profile of wound infections in out-patients at a level 1 trauma centre. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.jpsic.2015.06.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Srinivasamurthy B, Balamurugan M, Velu AK. Clinicopathologic significance of Papanicolaou smear study of postmenopausal women in a rural tertiary care center. Clin Cancer Investig J 2015. [DOI: 10.4103/2278-0513.152735] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Srinivasamurthy B, Balamurugan M, Velu AR. Clinicopathologic significance of Papanicolaou smear study of postmenopausal women in a rural tertiary care center. Clin Cancer Investig J 2015. [DOI: 10.4103/2278-0513.151934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Balamurugan M, Vadivelu P, Palaniandavar M. Iron(iii) complexes of tripodal tetradentate 4N ligands as functional models for catechol dioxygenases: the electronic vs. steric effect on extradiol cleavage. Dalton Trans 2014; 43:14653-68. [DOI: 10.1039/c3dt52145a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Brain stem lesions are pathologically heterogeneous. Pre-operative radiological diagnoses prove to be wrong in 10 to 20% of cases. It is therefore imperative to have a tissue diagnosis for appropriate therapeutic measures. We report a series of 24 patients (14 males, ten females, age range: 6-17 years) CT guided stereotactic biopsy for brain stem lesions approached via the suboccipital transcerebellar route in semi sitting position with principle used to violate only one pial plane with the biopsy probe not entering the ventral surface of the cerebellum. The inclusion and exclusion criteria with detailed material and method are discussed. Histological diagnosis was established in 23 patients (96%) with no procedure-related mortality. Our results indicate that stereotaxic approach to brain-stem lesions provides a high yield of positive histological diagnoses with a low incidence of morbidity. Awake CT-guided stereotactic biopsy via the suboccipital transcerebellar route in a semi-sitting position is a safe, reliable, and effective method for brainstem lesions that can obtain adequate tissue for histological diagnosis, thus providing each patient with the best available treatment.
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Affiliation(s)
- Purav Patel
- Department of Neurosurgery, Apollo Speciality Hospital, Chennai, India
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Balamurugan M, Kumar S, Kamachi Mudali U, Natarajan R. Measurement of dispersion numbers for 36 and 100% tri-isoamyl phosphate solvents equilibrated with aqueous nitric acid solutions. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1092-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Balamurugan M, Mayilmurugan R, Suresh E, Palaniandavar M. Nickel(ii) complexes of tripodal 4N ligands as catalysts for alkane oxidation using m-CPBA as oxidant: ligand stereoelectronic effects on catalysis. Dalton Trans 2011; 40:9413-24. [DOI: 10.1039/c1dt10902b] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Krishnamohan J, Srinivasan T, Manjunath S, Murugan P, Srinivasan V, Thamaraikannan P, Tholcopiyan L, Preethy S, Balamurugan M, Abraham S. Successful in vitro expansion and Characterization of Human Enteric Neuronal cells- A step towards Cell based therapies for Hirschsprung's disease. J Stem Cells Regen Med 2010; 6:170-171. [PMID: 24693162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Affiliation(s)
- J Krishnamohan
- Institute of Child Health and Hospital for Children , Chennai, India
| | - T Srinivasan
- Nichi-In Centre for Regenerative Medicine , Chennai, India
| | - S Manjunath
- Nichi-In Centre for Regenerative Medicine , Chennai, India
| | - P Murugan
- Nichi-In Centre for Regenerative Medicine , Chennai, India
| | - V Srinivasan
- Nichi-In Centre for Regenerative Medicine , Chennai, India
| | | | - L Tholcopiyan
- Nichi-In Centre for Regenerative Medicine , Chennai, India
| | - Sp Preethy
- Nichi-In Centre for Regenerative Medicine , Chennai, India
| | - M Balamurugan
- Sri Manakula Vinayagar Medical College & Hospitals , Pondicherry, India
| | - S Abraham
- Nichi-In Centre for Regenerative Medicine , Chennai, India ; Yamanashi University - Faculty of Medicine , Chuo, Japan
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Cooper EL, Balamurugan M. Unearthing a source of medicinal molecules. Drug Discov Today 2010; 15:966-72. [PMID: 20932936 DOI: 10.1016/j.drudis.2010.09.004] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2010] [Revised: 09/14/2010] [Accepted: 09/23/2010] [Indexed: 11/24/2022]
Affiliation(s)
- Edwin L Cooper
- Laboratory of Comparative Neuroimmunology, Department of Neurobiology, David Geffen School of Medicine at UCLA, University of California, Los Angeles, CA 90095-1763, USA.
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Manivannan S, Balamurugan M, Parthasarathi K, Gunasekaran G, Ranganathan LS. Effect of vermicompost on soil fertility and crop productivity--beans (Phaseolus vulgaris). J Environ Biol 2009; 30:275-281. [PMID: 20121031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Field experiments were conducted at Sivapuri, Chidambaram, Tamil Nadu to evaluate the efficacy of vermicompost, in comparison to inorganic fertilizers-NPK, on the physio-chemical and biological characteristics of the soils--clay loam soil (CLS) and sandy loam soil (SLS) and on the growth, yield and nutrient content of beans--Phaseolus vulgaris. Results showed that the application of vermicompost @ 5 tonnes ha(-1) had enhanced significantly the pore space (1.09 and 1.02 times), water holding capacity (1.1 and 1.3 times), cation exchange capacity (1.2 and 1.2 times). It reduced particles (1.2 and 1.2 times), and bulk density (1.2 and 1.2 times), pH (1 and 1.02 times) and electrical conductivity (1.4 and 1.2 times) and increased organic carbon (37 and 47 times), micro (Ca 3.07 and 1.9 times, Mg 1.6 and 1.6 times, Na 2.4 and 3.8 times, Fe 7 and 7.6 times, Mn 8.2 and 10.6 times, Zn 50 and 52 times and Cu 14 and 22 times) and macro (N 1.6 and 1.7 times, P 1.5 and 1.7 times, K 1.5 and 1.4 times) nutrients and microbial activity (1.4 and 1.5 times) in both soil types, particularly more in CLS. The growth, yield (1.6 times) and quality (protein (1.05 times) and sugar (1.01 times) content in seed) of bean were enhanced in CLS than SLS. On the other hand, the application of inorganic fertilizers @ 20:80:40 kg ha(-1) has resulted in reduced porosity (1.03 and 1.01 times), organic carbon (1.04 and 9.5 times) and microbial activity (1.02 and 1.03 times) in both soil types.
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Affiliation(s)
- S Manivannan
- Division of Vermibiotechnology, Department of Zoology, Annamalai University, Annamalainagar, India.
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Balamurugan M, Parthasarathi K, Cooper EL, Ranganathan LS. Anti-inflammatory and anti-pyretic activities of earthworm extract-Lampito mauritii (Kinberg). J Ethnopharmacol 2009; 121:330-332. [PMID: 19022370 DOI: 10.1016/j.jep.2008.10.021] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2007] [Revised: 09/25/2008] [Accepted: 10/23/2008] [Indexed: 05/27/2023]
Abstract
AIM OF THE STUDY Experiments were conducted to understand the therapeutic properties such as anti-inflammatory and anti-pyretic activities of biologically active extract isolated from whole earthworm (Lampito mauritii, Kinberg). MATERIALS AND METHODS Inflammation in the hind paw of Wistar albino rat, Rattus norvegicus, was induced by histamine, granuloma pouch was induced by turpentine and pyrexia induced by Brewer's yeast in rats were followed as earlier studies. Anti-inflammatory drug-indomethacin and anti-pyretic drug-paracetamol were used as standard drug for comparison. RESULTS Administration of indomethacin (10mg/kg), paracetamol (150 mg/kg) and/or different doses of earthworm extract (EE) (50, 100 and 200mg/kg) reduced and restored to normal conditions in a dose-dependent manner of histamine and turpentine induced inflammation, and Brewer's yeast induced pyretic in rats. CONCLUSIONS The most significant inhibition of paw oedema and granuloma and also the significant reduction in hyperpyrexia in rats when treated with standard drugs as well as different doses of EE, reflect the presence of anti-inflammatory and anti-pyretic properties of EE similar to glycoprotein complex (G-90).
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Affiliation(s)
- M Balamurugan
- Division of Vermibiotechnology, Department of Zoology, Annamalai University, Annamalai Nagar 608002, India.
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Balamurugan M. Restoration of histoarchitecture in the paracetamol-induced liver damaged rat by earthworm extract, Lampito mauritii (Kinberg). Eur Rev Med Pharmacol Sci 2007; 11:407-411. [PMID: 18306909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Lampito mauritii, an earthworm widely used in Siddha as well as Ayurveda, has been reported to have anti-inflammatory, anti-ulceral and anti-oxidative properties. The present investigation shows its hepatoprotective role. Whole tissue extract of Lampito mauritii protect the paracetamol (2 g/kg body weight. p.o.) induced liver damage rat as a dose dependent manner (100, 200 and 300 mg/kg body weight p.o.) by significantly (P < 0.05) decreasing the hepatic marker enzymes--aspartate transaminase, alanine transaminase and alkaline phosphatase similar to silymarin (150 mg/kg b.w. p.o.). Histopathological observations of liver tissues corroborated these findings.
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Affiliation(s)
- M Balamurugan
- Division of Vermibiotechnology, Department of Zoology, Annamalai University, Annamalai Nagar, India.
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Gupta A, Prajapati SK, Balamurugan M, Singh M, Bhatia D. Design and Development of a Proniosomal Transdermal Drug Delivery System for Captopril. TROP J PHARM RES 2007. [DOI: 10.4314/tjpr.v6i2.14647] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Abstract
The aim of the present study was to design a proniosomal drug delivery system of captopril to overcome the limitations of conventional dosage form and to optimize encapsulation parameters to achieve a delivery system suitable for in vitro investigations. Proniosomes are dry powders, which makes richer processing and packing possible. A surfactant coated carrier method was utilized to formulate proniosomal powder containing captopril as a model drug. This system was evaluated in vitro for drug loading, vesicle size, angle of repose, encapsulation efficiency, and stability studies. This method of proniosome loading resulted in 54.16-70.10% of encapsulation. This study examined critical parameters such as type and composition of surfactant. Proniosomes were investigated by transmission electron microscopy for characterization. Four week stability data for proniosomal powder is reported, and at all sampling points significantly higher drug retention was observed. Thus, it can be concluded that the encapsulation of captopril in proniosomes facilitates the controlled release and constitutes a good choice.
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Affiliation(s)
- Ankur Gupta
- Jaipur College of Pharmacy, ISI-15, RIICO Institutional Area, Sitapura, Jaipur-302022, Rajasthan, India.
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Balamurugan M, Parthasarathi K, Cooper EL, Ranganathan LS. Earthworm paste (Lampito mauritii, Kinberg) alters inflammatory, oxidative, haematological and serum biochemical indices of inflamed rat. Eur Rev Med Pharmacol Sci 2007; 11:77-90. [PMID: 17552137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Experiments were conducted to understand the therapeutic properties such as anti-inflammatory, anti-oxidative, haematological and serum biochemical markers of earthworm paste (EP) derived from an indigenous species Lampito mauritii (Kinberg), in comparison with the standard anti-inflammatory drug- aspirin, on Wistar albino rat (Rattus norvegicus). Administration of earthworm paste of Lampito mauritii at the rate of 80 mg/kg into albino rats which were induced of inflammation, was found to reduce inflammation, restore the levels of antioxidants-reduced glutathione, glutathione peroxidase, superoxide dismutase, catalase and thiobarbituric acid reactive substances, normalise the values of erythrocyte, leukocyte, differential levels of neutrophils, lymphocytes, eosinophils, haemoglobin and serum biochemical contents e.g., protein, albumin, glucose, cholesterol, acid and alkaline phosphatase, electrolytes e.g., sodium, potassium and chloride. The anti-inflammatory activity together with antioxidant property of EP seems to be due to the high polyphenolic content of earthworm tissue.
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Affiliation(s)
- M Balamurugan
- Division of Vermibiotechnology, Department of Zoology, Annamalai University, Annamalainagar, India.
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Prakash M, Balamurugan M, Parthasarathi K, Gunasekaran G, Cooper EL, Ranganathan LS. Anti-ulceral and anti-oxidative properties of "earthworm paste" of Lampito mauritii (Kinberg) on Rattus Norvegicus. Eur Rev Med Pharmacol Sci 2007; 11:9-15. [PMID: 17405344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Studies have been made to understand the anti-ulceral and anti-oxidant properties of the "earthworm paste" derived from Lampito mauritii (Kinberg), an indigenous species, in comparison with the standard anti-ulceral drug-ranitidine, on the Wistar strain albino rats Rattus norvegicus. Administration of 200 mg/kg aspirin was found to increase the volume of gastric juice secretion, total acidity, free acidity, ulcer index and reduce the pH. It also had decreased the anti-oxidant levels such as reduced glutathione, glutathione peroxidase, catalase, superoxide dismutase and increased the level of thiobarbituric acid reactive substances. Pretreatment with the standard drug-ranitidine (50 mg/kg) and different doses of "earthworm paste" (20, 40, 80, 160 and 320 mg/kg) in ulcer induced animal had enhanced the pH, decreased the volume of gastric juice, free acidity, total acidity and reduced the ulcer index. Further the activities of reduced glutathione, glutathione peroxidase, catalase, superoxide dismutase were increased whereas the thiobarbituric acid reactive substance had decreased. The results were more significant in rats administered with 160 mg/kg "earthworm paste" than the application of ranitidine and other doses of "earthworm paste". This indicates the presence of antiulcer and anti-oxidative effects in "earthworm paste". In conclusion, administration of 160 mg "earthworm paste"/kg was found to have better therapeutic properties.
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Affiliation(s)
- M Prakash
- Division of Vermibiotechnology, Department of Zoology, Annamalai University, Annamalainagar, India
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Patel P, Reginald J, Mahadev P, Mallikarjuna VS, Annapurneswari S, Balamurugan M. Cerebellomedullary ganglioglioma: A case report and review of literature. J Pediatr Neurosci 2007. [DOI: 10.4103/1817-1745.32003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Patel P, Raja T, Annapurneswari S, Balamurugan M. Solitary hemorrhagic intra-cerebral metastatic osteosarcoma. J Pediatr Neurosci 2007. [DOI: 10.4103/1817-1745.36769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Purav P, Ganapathy K, Mallikarjuna VS, Annapurneswari S, Kalyanaraman S, Reginald J, Natarajan P, Bapu KRS, Balamurugan M. Rosai–Dorfman disease of the central nervous system. J Clin Neurosci 2005; 12:656-9. [PMID: 16099162 DOI: 10.1016/j.jocn.2005.06.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Rosai-Dorfman disease (RDD) is an idiopathic, non-neoplastic, lymphoproliferative disorder characterized by sinus histiocytosis and massive lymphadenopathy. When RDD involves the central nervous system the lesion simulates a meningioma. Histological and immunohistochemical confirmation is essential for a definitive diagnosis. In this paper, ten cases of RDD confined to the central nervous system are reported. Another case with orbital RDD was excluded. Nine cases involved the cranial cavity alone; in one, the cervical extradural region was also involved. Treatment consisted of surgical excision or biopsy. Histology and immunohistochemistry revealed a mixed cell population of predominantly mature histiocytes with evidence of emperipolesis and strong positivity for S100 protein in all cases. No recurrence was observed during follow up ranging from three months to eight years.
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Affiliation(s)
- P Purav
- Department of Neurosurgery, Apollo Specialty Hospital, Chennai, India
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Patel P, Kalyanaraman S, Reginald J, Natarajan P, Ganapathy K, Suresh Bapu KR, Thamburaj AV, Chendhilnathan B, Balamurugan M. Post-traumatic cranial nerve injury. The Indian Journal of Neurotrauma 2005. [DOI: 10.1016/s0973-0508(05)80007-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kate V, Ananthakrishnan N, Badrinath S, Amarnath SK, Balamurugan M, Ratnakar C. Helicobacter pylori infection and erosive gastritis. J Assoc Physicians India 1998; 46:436-7. [PMID: 11273284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
One hundred and eleven patients were included in the study. Thirty seven had erosive gastritis, thirty four chronic gastritis and forty were controls without any gastrointestinal diseases confirmed by symptoms and upper gastrointestinal endoscopy. Patients with erosive gastritis were divided into non-steroidal anti-inflammatory drug (NSAID) users and non-users. H pylori status was determined by urease test, serology and/or histology. The prevalence of H pylori was compared between the various groups. The prevalence of H pylori infection in erosive gastritis, chronic gastritis and controls was 68%, 76% and 65%, respectively, the difference was not significant (P > 0.05), 8 out of 11 patients with erosive gastritis and NSAID use (73%) were positive for H pylori. Likewise 17/26 patients with erosive gastritis without NSAID use (65%) were positive for H pylori (P > 0.05). Body of the stomach (65%) was the commonest site for erosions compared to antrum (43%) or fundus (27%) (P < 0.02). H pylori infection does not predispose to erosive gastritis. NSAID use does not affect H pylori prevalence. Routine H pylori eradication is, therefore, not indicated in patients with erosive gastritis infection. Body of the stomach is the most predominant site for erosions.
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Affiliation(s)
- V Kate
- Dept of Surgery, Jawaharlal Institute of Postgraduate Medical Education and Research, Pondicherry-605006
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