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Himanshu JK, Lakshmi GBVS, Verma AK, Ahlawat A, Solanki PR. Development of aptasensor for chlorpyrifos detection using paper-based screen-printed electrode. Environ Res 2024; 240:117478. [PMID: 37879395 DOI: 10.1016/j.envres.2023.117478] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 09/22/2023] [Accepted: 10/22/2023] [Indexed: 10/27/2023]
Abstract
Novel Carbon quantum dots-graphite composite ink-based Screen-printed electrodes (CQDs/SPEs) were used to assemble a highly sensitive electrochemical aptasensor against chlorpyrifos (CPF). The aptasensor showed a broad linear range from 1 pM (0.445 ng/ml) to 500 nM (0.22 mg/ml) with a detection limit (LOD) 0.834 pM (0.37 ng/ml); sensitivity 21.39 μA pM-1 cm- 2 and with good linearity of R2 = 0.973. Moreover, the aptasensor's showed better selectivity among few other pesticides. Further, the aptasensor electrode showed high stability for five months when stored at 4 °C. In the final step, the aptasensor's ability to identify CPF in real samples was evaluated on spiked potato (Solanum tuberosum) extract samples. Potato extract spiked with CPF in the electrochemical aptasensing platform showed excellent linearity of R2 = 0.981. The developed aptasensor showed good response to without spiked potato extract with increasing volumes. Hence, the developed aptasensor demonstrated reasonable applicability in real food and agriculture samples.
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Affiliation(s)
- Jayendra Kumar Himanshu
- Special Centre for Nanoscience, Jawaharlal Nehru University (JNU), New Delhi, 110067, India; Department of Biotechnology, School of Life Sciences, Mahatma Gandhi Central University, Motihari, Bihar, 845401, India
| | - G B V S Lakshmi
- Special Centre for Nanoscience, Jawaharlal Nehru University (JNU), New Delhi, 110067, India
| | - Awadhesh Kumar Verma
- Special Centre for Nanoscience, Jawaharlal Nehru University (JNU), New Delhi, 110067, India
| | - Amit Ahlawat
- Special Centre for Nanoscience, Jawaharlal Nehru University (JNU), New Delhi, 110067, India; Deenbandhu Chhotu Ram University of Science and Technology, Murthal, 131039, India
| | - Pratima R Solanki
- Special Centre for Nanoscience, Jawaharlal Nehru University (JNU), New Delhi, 110067, India.
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Poddar M, Lakshmi GBVS, Sharma M, Chaudhary N, Nigam S, Joshi M, Solanki PR. Environmental friendly Polyacrylonitrile nanofiber mats encapsulated and coated with green algae mediated Titanium oxide nanoparticles for efficient oil spill adsorption. Mar Pollut Bull 2022; 182:113971. [PMID: 35905700 DOI: 10.1016/j.marpolbul.2022.113971] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Revised: 07/14/2022] [Accepted: 07/18/2022] [Indexed: 06/15/2023]
Abstract
Oil spill causes extreme environmental damage, from aquatic life to seabirds, disrupting the entire ecosystem. Herein, we have synthesized high scale, economical and bio-compatible, green algae mediated Titanium oxide (TiO2) nanoparticles and Polyacrylonitrile (PAN) nanofiber mats. We have studied the effect of encapsulation and coating of TiO2 nanoparticles over nanofiber mats for highly efficient oil spill adsorption. TiO2 encapsulated and coated PAN (TECP) nanofibers showed a maximum of 62.34 g g-1 adsorption capacity of petroleum oil from the water surface. Moreover, the composite mats show maximum adsorption within 45 s for up to 5 repeated cycles. Further, it has been observed that the adsorption capacity has increased by increasing the weight of the composite nanofiber mats, which confirms its commercial applicability. Thus, this work provides rapid, large-scale, economical, bio-compatible, and highly effective adsorbents for oil spill cleaning and extraction over natural waterbodies.
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Affiliation(s)
- Mrinal Poddar
- Amity Institute of Nanotechnology, Amity University, Noida, Uttar Pradesh, India
| | - G B V S Lakshmi
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi, India
| | - Mahima Sharma
- Amity Institute of Nanotechnology, Amity University, Noida, Uttar Pradesh, India
| | - Navneet Chaudhary
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi, India; Department of Biotechnology, Delhi Technological University, New Delhi, India
| | - Subhasha Nigam
- Amity Institute of Biotechnology, Amity University, Noida, Uttar Pradesh, India
| | - Monika Joshi
- Amity Institute of Nanotechnology, Amity University, Noida, Uttar Pradesh, India.
| | - Pratima R Solanki
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi, India
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Singh AK, Dhiman TK, Lakshmi GBVS, Raj R, Jha SK, Solanki PR. Rapid and label-free detection of Aflatoxin-B1 viamicrofluidic electrochemical biosensor based on manganese (III) oxide (Mn 3O 4) synthesized by co-precipitation route at room temperature. Nanotechnology 2022; 33:285501. [PMID: 35299158 DOI: 10.1088/1361-6528/ac5ee2] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 03/17/2022] [Indexed: 06/14/2023]
Abstract
Aflatoxin B1 (AFB1) is the most toxic mycotoxin, naturally occurring in food items, and it causes several types of lethal diseases. Therefore, a rapid and convenient detection method for AFB1 is the first step toward overcoming the effect of AFB1. The current work presents the development of an efficient microfluidic electrochemical-based biosensor using tri-manganese tetroxide nanoparticles (Mn3O4nps) for AFB1 detection. The Mn3O4nps were synthesized at room temperature through the co-precipitation route. Its phase purity, structural and morphological studies have been characterized through x-ray diffraction, Raman spectroscopy, energy-dispersive x-ray, Fourier transform infrared spectroscopy and transmission electron microscopy. The mask-less UV-lithography was carried out to fabricate the three-electrode chip and microfluidic channel of the microfluidic electrochemical biosensing system. The designed microfluidic immunosensor (BSA/Ab-AFB1/Mn3O4/ITO) was fabricated using the three-electrode chip, microfluidic channel in poly-dimethyl siloxane. The fabricated sensor exhibited the 3.4μA ml ng-1cm-2sensitivity and had the lowest lower detection limit of 0.295 pg ml-1with the detection range of 1 pg ml-1to 300 ng ml-1. Additionally, the spiked study was also performed with this immunoelectrode and a recovery rate was obtained of 108.2%.
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Affiliation(s)
- Avinash Kumar Singh
- Special Centre for Nanoscience, Jawaharlal Nehru University (JNU), New Delhi-110067, India
- School of Physical Sciences, JNU, New Delhi-110067, India
| | - Tarun Kumar Dhiman
- Special Centre for Nanoscience, Jawaharlal Nehru University (JNU), New Delhi-110067, India
| | - G B V S Lakshmi
- Special Centre for Nanoscience, Jawaharlal Nehru University (JNU), New Delhi-110067, India
| | - Rishi Raj
- Indian Institute of Technology, New Delhi-110067, India
| | | | - Pratima R Solanki
- Special Centre for Nanoscience, Jawaharlal Nehru University (JNU), New Delhi-110067, India
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Sri S, Lakshmi GBVS, Gulati P, Chauhan D, Thakkar A, Solanki PR. Simple and facile carbon dots based electrochemical biosensor for TNF-α targeting in cancer patient's sample. Anal Chim Acta 2021; 1182:338909. [PMID: 34602194 DOI: 10.1016/j.aca.2021.338909] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Revised: 07/31/2021] [Accepted: 08/02/2021] [Indexed: 01/05/2023]
Abstract
Tumour Necrosis Factor (TNF-α) is a pro-inflammatory cytokine having key roles in cell death, differentiation, survival, proliferation, migration and is a modulator of immune system. Therefore, TNF-α is an ideal biomarker for several disease diagnosis including cancer. However, out of all the biomarkers of cancer, TNF-α) is less explored for cancer detection. Only a few reports are available of developing biosensors for TNF-α targeting in human serum samples. Also, Carbon Dots (CDs) remains less explored in biosensor application. In this regard, for the first time, a sensitive and low-cost electrochemical biosensor based on CDs has developed. CDs were synthesized by simple yet facile microwave pyrolysis. Poly methyl methacrylate (PMMA) was selected as the matrix to hold CDs to fabricate the biosensing platform. This novel CD-PMMA nanocomposite featuring excellent biocompatibility, exceptional electrocatalytic conductivity, and large surface area. CD-PMMA was applied as transducing material to efficiently conjugate antibodies specific towards TNF-α and fabricate electrochemical immunosensor for specific detection of TNF-α. The fabricated immunosensor was used for the detection of TNF-α within a wide dynamic range of 0.05-160 pg mL-1 with a lower detection limit of 0.05 pg mL-1 and sensitivity of 5.56 pg mL-1 cm-2. Furthermore, this CDs based immunosensor retains high sensitivity, selectivity, and stability. This immunosensor demonstrated a high correlation with the conventional technique, Enzyme-Linked Immunosorbent Assay for early screening of cancer patient serum samples.
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Affiliation(s)
- Smriti Sri
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi, 110067, India
| | - G B V S Lakshmi
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Payal Gulati
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Deepika Chauhan
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Alok Thakkar
- All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110029, India
| | - Pratima R Solanki
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi, 110067, India.
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Lakshmi GBVS, Kaushik A, Kumar A, Solanki PR. Editorial: National Conference on Nano/Bio-Technology 2019, India. Front Nanotechnol 2021. [DOI: 10.3389/fnano.2021.742043] [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: 11/13/2022] Open
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Kamiya K, Kayama K, Nobuoka M, Sakaguchi S, Sakurai T, Kawata M, Tsutsui Y, Suda M, Idesaki A, Koshikawa H, Sugimoto M, Lakshmi GBVS, Avasthi DK, Seki S. Ubiquitous organic molecule-based free-standing nanowires with ultra-high aspect ratios. Nat Commun 2021; 12:4025. [PMID: 34188041 PMCID: PMC8241875 DOI: 10.1038/s41467-021-24335-x] [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] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 06/08/2021] [Indexed: 11/08/2022] Open
Abstract
The critical dimension of semiconductor devices is approaching the single-nm regime, and a variety of practical devices of this scale are targeted for production. Planar structures of nano-devices are still the center of fabrication techniques, which limit further integration of devices into a chip. Extension into 3D space is a promising strategy for future; however, the surface interaction in 3D nanospace make it hard to integrate nanostructures with ultrahigh aspect ratios. Here we report a unique technique using high-energy charged particles to produce free-standing 1D organic nanostructures with high aspect ratios over 100 and controlled number density. Along the straight trajectory of particles penetrating the films of various sublimable organic molecules, 1D nanowires were formed with approximately 10~15 nm thickness and controlled length. An all-dry process was developed to isolate the nanowires, and planar or coaxial heterojunction structures were built into the nanowires. Electrical and structural functions of the developed standing nanowire arrays were investigated, demonstrating the potential of the present ultrathin organic nanowire systems.
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Affiliation(s)
- Koshi Kamiya
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Kazuto Kayama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Masaki Nobuoka
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Shugo Sakaguchi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Tsuneaki Sakurai
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan.
| | - Minori Kawata
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Yusuke Tsutsui
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Masayuki Suda
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Akira Idesaki
- Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, Takasaki, Gunma, Japan
| | - Hiroshi Koshikawa
- Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, Takasaki, Gunma, Japan
| | - Masaki Sugimoto
- Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, Takasaki, Gunma, Japan
| | - G B V S Lakshmi
- Special Center for Nanoscience, Jawaharlal Nehru University, New Delhi, India
| | - D K Avasthi
- Department of Physics, School of Engineering, University of Petroleum and Energy Studies, Dehradun, India
| | - Shu Seki
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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Singh AK, Lakshmi GBVS, Dhiman TK, Kaushik A, Solanki PR. Bio-Active Free Direct Optical Sensing of Aflatoxin B1 and Ochratoxin A Using a Manganese Oxide Nano-System. Front Nanotechnol 2021. [DOI: 10.3389/fnano.2020.621681] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Aflatoxins-B1 (AFB1) and Ochratoxin-A (OchA) are the two types of major mycotoxin produced by Aspergillus flavus, Aspergillus parasiticus fungi, Aspergillus carbonarius, Aspergillus niger, and Penicillium verrocusumv. These toxins are mainly found in metabolite cereals, corn, coffee beans, and other oil-containing food items. Excessive consumption of these toxins can be carcinogenic and lead to cancer. Thus, their rapid testing became essential for food quality control. Herein, manganese oxide nanoparticles (MnO2 nps) have been proposed to explore the interaction with AFB1 and OchA using UV-visible spectroscopy. MnO2 nps were synthesized using the co-precipitation method. They were pure and crystalline with an average crystallite size of 5–6 nm. In the UV-vis study, the maximum absorbance for MnO2 nps was observed around 260 nm. The maximum absorbance for AFB1 and OchA was observed at 365 and 380 nm, respectively, and its intensity enhanced with the addition of MnO2 nps. Sequential changes were observed with varying the concentration of AFB1 and OchA with a fixed concentration of MnO2 nps, resulting in proper interaction. The binding constant (kb) and Gibbs free energy for MnO2 nps-AFB1 and OchA were observed as 1.62 × 104 L g−1 and 2.67 × 104 L g−1, and −24.002 and −25.256 kJ/mol, respectively. The limit of detection for AFB1 and OchA was measured as 4.08 and 10.84 ng/ml, respectively. This bio‐active free direct sensing approach of AFB1 and OchA sensing can be promoted as a potential analytical tool to estimate food quality rapidly and affordable manner at the point of use.
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Lakshmi GBVS, Yadav AK, Mehlawat N, Jalandra R, Solanki PR, Kumar A. Gut microbiota derived trimethylamine N-oxide (TMAO) detection through molecularly imprinted polymer based sensor. Sci Rep 2021; 11:1338. [PMID: 33446682 PMCID: PMC7809026 DOI: 10.1038/s41598-020-80122-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 12/15/2020] [Indexed: 01/29/2023] Open
Abstract
Trimethylamine N-oxide (TMAO), a microbiota-derived metabolite has been implicated in human health and disease. Its early detection in body fluids has been presumed to be significant in understanding the pathogenesis and treatment of many diseases. Hence, the development of reliable and rapid technologies for TMAO detection may augment our understanding of pathogenesis and diagnosis of diseases that TMAO has implicated. The present work is the first report on the development of a molecularly imprinted polymer (MIP) based electrochemical sensor for sensitive and selective detection of TMAO in body fluids. The MIP developed was based on the polypyrrole (PPy), which was synthesized via chemical oxidation polymerization method, with and without the presence of TMAO. The MIP, NIP and the non-sonicated polymer (PPy-TMAO) were separately deposited electrophoretically onto the hydrolyzed indium tin oxide (ITO) coated glasses. The chemical, morphological, and electrochemical behavior of MIP, non-imprinted polymer (NIP), and PPy-TMAO were characterized using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and electrochemical techniques. The detection response was recorded using differential pulse voltammetry (DPV), which revealed a decrease in the peak current with the increase in concentration of TMAO. The MIP sensor showed a dynamic detection range of 1-15 ppm with a sensitivity of 2.47 µA mL ppm-1 cm-2. The developed sensor is easy to construct and operate and is also highly selective to detect TMAO in body fluids such as urine. The present research provides a basis for innovative strategies to develop sensors based on MIP to detect other metabolites derived from gut microbiota that are implicated in human health and diseases.
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Affiliation(s)
- G. B. V. S. Lakshmi
- grid.10706.300000 0004 0498 924XSpecial Center for Nanoscience, Jawaharlal Nehru University, New Delhi, India
| | - Amit K. Yadav
- grid.10706.300000 0004 0498 924XSpecial Center for Nanoscience, Jawaharlal Nehru University, New Delhi, India
| | - Neha Mehlawat
- grid.444644.20000 0004 1805 0217Amity Institute of Applied Sciences, Amity University, Uttar Pradesh, Noida, India
| | - Rekha Jalandra
- grid.411524.70000 0004 1790 2262Department of Zoology, Maharshi Dayanand University, Rohtak, 124001 India ,grid.19100.390000 0001 2176 7428National Institute of Immunology, New Delhi, India
| | - Pratima R. Solanki
- grid.10706.300000 0004 0498 924XSpecial Center for Nanoscience, Jawaharlal Nehru University, New Delhi, India
| | - Anil Kumar
- grid.19100.390000 0001 2176 7428National Institute of Immunology, New Delhi, India
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Sulania I, Pricilla RB, Lakshmi GBVS. Investigating the Nanocomposite Thin Films of Hematite α-Fe2O3 and Nafion for Cholesterol Biosensing Applications. Front Nanotechnol 2020. [DOI: 10.3389/fnano.2020.585721] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Nanocomposite materials are multi-phase materials, usually solids, which have two or more component materials having different chemical and physical properties. When blended together, a newer material is formed with distinctive properties which make them an eligible candidate for many important applications. In the present study, thin films of nafion (polymer) and hematite or α-Fe2O3 (nanoparticles) nanocomposite is fabricated on indium tin oxide (ITO) coated glass substrates, due to its enhanced ionic conductivity, for cholesterol biosensor applications. Scanning electron microscopy and Atomic force microscopy revealed the formation of nanorod structured α-Fe2O3 in the films. The cyclic voltammetry (CV) studies of nafion-α-Fe2O3/ITO revealed the redox properties of the nanocomposites. The sensing studies were performed on nafion-α-Fe2O3/CHOx/ITO bioelectrode using differential pulse voltammetry (DPV) at various concentrations of cholesterol. The enzyme immobilization leaded to the selective detection of cholesterol with a sensitivity of 64.93 × 10−2 μA (mg/dl)−1 cm−2. The enzyme substrate interaction (Michaelis–Menten) constant Km, was obtained to be 19 mg/dl.
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Srivastava P, Lakshmi GBVS, Sri S, Chauhan D, Chakraborty A, Singh S, Solanki PR. Potential of electrospun cellulose acetate nanofiber mat integrated with silver nanoparticles from Azadirachta indica as antimicrobial agent. J Polym Res 2020. [DOI: 10.1007/s10965-020-02308-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Pachauri N, Lakshmi GBVS, Sri S, Gupta PK, Solanki PR. Silver molybdate nanoparticles based immunosensor for the non-invasive detection of Interleukin-8 biomarker. Mater Sci Eng C Mater Biol Appl 2020; 113:110911. [PMID: 32487373 DOI: 10.1016/j.msec.2020.110911] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Revised: 03/14/2020] [Accepted: 03/31/2020] [Indexed: 12/14/2022]
Abstract
In this study, we report the silver molybdate nanoparticles (β-Ag2MoO4 NPs) based non-invasive and sensitive electrochemical immunosensor for label-free detection of Interleukin-8 (IL-8) biomarker. The X-ray diffraction and Raman spectroscopy studies confirm the cubic spinel structures of β-Ag2MoO4 NPs. High-resolution transmission electron microscopy study depicted average size of β-Ag2MoO4 NPs as 27.15 nm. The cleaned indium tin oxide coated glass substrates were coated with spin-coated thin films of Ag2MoO4 NPs. These electrodes used for covalently immobilization of antibodies specific to IL-8 (Anti-IL-8) using EDC-NHS chemistry and unbound activated sites blocked by bovine serum albumin. Electrochemical response was obtained in the range of 1 fg mL-1 to 40 ng mL-1 and the sensitivity was found to be 7.03 μA ng-1mL cm-2 with LOD of 90 pg mL-1. Spiked samples prepared by human saliva were tested and found efficient detection with this immunoelectrode.
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Affiliation(s)
- Namrata Pachauri
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India
| | - G B V S Lakshmi
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India
| | - Smriti Sri
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India
| | - Pramod K Gupta
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India
| | - Pratima R Solanki
- Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India.
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12
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Dhiman TK, Lakshmi GBVS, Roychoudhury A, Jha SK, Solanki PR. Ceria‐Nanoparticles‐Based Microfluidic Nanobiochip Electrochemical Sensor for the Detection of Ochratoxin‐A. ChemistrySelect 2019. [DOI: 10.1002/slct.201803752] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Tarun K. Dhiman
- Special Centre for NanoscienceJawaharlal Nehru University New Delhi- 110067
| | - GBVS Lakshmi
- Special Centre for NanoscienceJawaharlal Nehru University New Delhi- 110067
| | - Appan Roychoudhury
- Centre for Biomedical EngineeringIndian Institute of Technology Delhi, Hauz Khas New Delhi- 110016
| | - Sandeep K. Jha
- Centre for Biomedical EngineeringIndian Institute of Technology Delhi, Hauz Khas New Delhi- 110016
| | - Pratima R. Solanki
- Special Centre for NanoscienceJawaharlal Nehru University New Delhi- 110067
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Tyagi C, Lakshmi GBVS, Jaiswal V, Avasthi DK, Tripathi A. Gold –graphene oxide nanocomposites for enzyme-less glucose monitoring. Biomed Phys Eng Express 2018. [DOI: 10.1088/2057-1976/aadd5f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Lakshmi GBVS, Sharma A, Solanki PR, Avasthi DK. Mesoporous polyaniline nanofiber decorated graphene micro-flowers for enzyme-less cholesterol biosensors. Nanotechnology 2016; 27:345101. [PMID: 27419910 DOI: 10.1088/0957-4484/27/34/345101] [Citation(s) in RCA: 15] [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] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In the present work, we have studied a nanocomposite of polyaniline nanofiber-graphene microflowers (PANInf-GMF), prepared by an in situ rapid mixing polymerization method. The structural and morphological studies of the nanocomposite (PANInf-GMF) were carried out by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared (FTIR) and Raman spectroscopy. The mesoporous, nanofibrous and microflower structures were observed by scanning electron microscopy. The functional groups and synergetic effects were observed by FTIR and micro-Raman measurements. The water wettability was carried out by a contact angle measurement technique and found to be super hydrophilic in nature towards water. This nanocomposite was deposited onto indium-tin-oxide coated glass substrate by a drop casting method and used for the detection of cholesterol using an electrochemical technique. The differential pulse voltammetry studies show the appreciable increase in the current with the addition of 1.93 to 464.04 mg dl(-1) cholesterol concentration. It is also found that the electrodes were highly selective towards cholesterol when compared to other biological interfering analytes, such as glucose, urea, citric acid, cysteine and ascorbic acid. The sensitivity of the sensor is estimated as 0.101 μA mg(-1) dl cm(-2) and the lower detection limit as 1.93 mg dl(-1). This work will throw light on the preparation of non-enzymatic biosensors based on PANInf-carbon nanostructure composites.
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Affiliation(s)
- G B V S Lakshmi
- Inter University Accelerator Centre (IUAC), New Delhi, India
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Horio A, Sakurai T, Lakshmi GBVS, Kumar Avasthi D, Sugimoto M, Yamaki T, Seki S. Formation of nanowires via single particle-triggered linear polymerization of solid-state aromatic molecules. Nanoscale 2016; 8:14925-14931. [PMID: 27355341 DOI: 10.1039/c6nr03297d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Nanowires occupy a prestigious place in nanoelectronics, nanomechanics, and biomimetics. Although there are notable methods to grow nanowires via self-assembly, there is a key drawback in the need to find out the specific conditions appropriate for each system. In this sense, universal techniques to fabricate such nanowires from various organic materials have been sought for the continued progress of the related research field. Here we report one of the promising and facile methodologies to quantitatively produce nanowires with controlled geometrical parameters. In this method, referred to as "Single Particle-Triggered Linear Polymerization (STLiP)", organic thin films on a supporting substrate were irradiated with high-energy charged particles, accelerated by particle accelerators. Each particle penetrates from the top of the films to the substrate while gradually releasing kinetic energy along its trajectory (ion track), generating reactive intermediates such as radical species that eventually induce propagation reactions. The resulting polymerized products were integrated into nanowires with uniform diameter and length that can be isolated via development with appropriate organic solvents. Considering the widely applicable nature of STLiP to organic materials, the present technique opens a new door for access to a number of functional nanowires and their assembly.
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Affiliation(s)
- Akifumi Horio
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.
| | - Tsuneaki Sakurai
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.
| | - G B V S Lakshmi
- Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
| | - Devesh Kumar Avasthi
- Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India and Amity Institute of Nanotechnology, Amity University, Noida 201313, India
| | - Masaki Sugimoto
- Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, 1233 Watanuki-machi, Takasaki, Gunma 370-1292, Japan
| | - Tetsuya Yamaki
- Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, 1233 Watanuki-machi, Takasaki, Gunma 370-1292, Japan
| | - Shu Seki
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.
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Joshi N, Sharma A, Rawat K, Asokan K, Solanki PR, Lakshmi GBVS, Kanjilal D, Bohidar HB. Comparative evaluation of enzyme-free nanoclay-ionic liquid based electrodes for detection of bioanalytes. RSC Adv 2016. [DOI: 10.1039/c6ra11514d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Enzyme-free electrodes were fabricated using mixed nanoclays and ionic liquids.
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Affiliation(s)
- Nidhi Joshi
- Polymer and Biophysics Laboratory
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
| | - Abhimanyu Sharma
- Special Center for Nanosciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
- Inter University Accelerator Centre
| | - Kamla Rawat
- Special Center for Nanosciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
- Inter University Accelerator Centre
| | - K. Asokan
- Inter University Accelerator Centre
- New Delhi 110067
- India
| | - P. R. Solanki
- Special Center for Nanosciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
| | | | - D. Kanjilal
- Inter University Accelerator Centre
- New Delhi 110067
- India
| | - H. B. Bohidar
- Polymer and Biophysics Laboratory
- School of Physical Sciences
- Jawaharlal Nehru University
- New Delhi 110067
- India
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Ali V, Kaur R, Lakshmi GBVS, Kumar A, Kumari K, Kumar S. Electrical conductivity and dielectric parameters of polyaniline doped with CuClO4· 4BN in aqueous DMSO solvent. Adv Polym Technol 2011. [DOI: 10.1002/adv.20260] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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