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Sharma P, Naithani S, Layek S, Kumar A, Rawat R, Kaja S, Nag A, Kumar S, Goswami T. Development of low-cost copper nanoclusters for highly selective "turn-on" sensing of Hg 2+ ions. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 297:122697. [PMID: 37071963 DOI: 10.1016/j.saa.2023.122697] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Revised: 03/29/2023] [Accepted: 03/31/2023] [Indexed: 05/03/2023]
Abstract
The development of low-cost earth abundant metal based fluorescent sensors for a rapid and selective nanomolar level detection of Hg2+ is essential due to the increasing world-wide concern of its detrimental effect on humans as well as the environment. Herein, we present a perylene tetracarboxylic acid functionalized copper nanoclusters (CuNCs) based "turn-on" fluorescence probe for highly selective detection of toxic Hg2+ ions. The fabricated CuNCs exhibited high photostability with emission maximum centered at 532 nm (λex = 480 nm). The fluorescence intensity of CuNCs was remarkably enhanced upon the addition of Hg2+ over other competing ions and neutral analytes. Notably, the 'turn-on' fluorescence response exhibits highly sensitive detection limit as low as 15.9 nM (S/N ∼ 3). The time resolved fluorescence spectroscopy suggested the energy transfer between CuNCs and Hg2+ ions following either inhibited fluorescence resonance energy transfer (FRET) or surface modification of CuNCs during Hg2+ sensing. This study offers the systematic design and development of new fluorescent 'turn-on' nanoprobes for rapid and selective recognition of heavy metal ions.
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Affiliation(s)
- Pooja Sharma
- Department of Chemistry, Applied Sciences Cluster, University of Petroleum & Energy Studies (UPES), Energy Acres Building, Dehradun 248007, Uttarakhand, India
| | - Sudhanshu Naithani
- Department of Chemistry, Applied Sciences Cluster, University of Petroleum & Energy Studies (UPES), Energy Acres Building, Dehradun 248007, Uttarakhand, India
| | - Samar Layek
- Department of Physics, Applied Sciences Cluster, University of Petroleum & Energy Studies (UPES), Energy Acres Building, Dehradun 248007, Uttarakhand, India
| | - Amit Kumar
- Department of Chemistry, Applied Sciences Cluster, University of Petroleum & Energy Studies (UPES), Energy Acres Building, Dehradun 248007, Uttarakhand, India
| | - Reema Rawat
- School of Health Sciences and Technology, University of Petroleum and Energy Studies, Dehradun 248007, India
| | - Sravani Kaja
- Department of Chemistry, BITS Pilani, Hyderabad 5000078, India
| | - Amit Nag
- Department of Chemistry, BITS Pilani, Hyderabad 5000078, India
| | - Sushil Kumar
- Department of Chemistry, Applied Sciences Cluster, University of Petroleum & Energy Studies (UPES), Energy Acres Building, Dehradun 248007, Uttarakhand, India.
| | - Tapas Goswami
- Department of Chemistry, Applied Sciences Cluster, University of Petroleum & Energy Studies (UPES), Energy Acres Building, Dehradun 248007, Uttarakhand, India.
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Hyder A, Buledi JA, Nawaz M, Rajpar DB, Shah ZUH, Orooji Y, Yola ML, Karimi-Maleh H, Lin H, Solangi AR. Identification of heavy metal ions from aqueous environment through gold, Silver and Copper Nanoparticles: An excellent colorimetric approach. ENVIRONMENTAL RESEARCH 2022; 205:112475. [PMID: 34863692 DOI: 10.1016/j.envres.2021.112475] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 11/01/2021] [Accepted: 11/24/2021] [Indexed: 05/25/2023]
Abstract
Heavy metal pollution has become a severe threat to human health and the environment for many years. Their extensive release can severely damage the environment and promote the generation of many harmful diseases of public health concerns. These toxic heavy metals can cause many health problems such as brain damage, kidney failure, immune system disorder, muscle weakness, paralysis of the limbs, cardio complaint, nervous system. For many years, researchers focus on developing specific reliable analytical methods for the determination of heavy metal ions and preventing their acute toxicity to a significant extent. The modern researchers intended to utilize efficient and discerning materials, e.g. nanomaterials, especially the metal nanoparticles to detect heavy metal ions from different real sources rapidly. The metal nanoparticles have been broadly utilized as a sensing material for the colorimetric detection of toxic metal ions. The metal nanoparticles such as Gold (Au), Silver (Ag), and Copper (Cu) exhibited localized plasmon surface resonance (LPSR) properties which adds an outstanding contribution to the colorimetric sensing field. Though, the stability of metal nanoparticles was major issue to be exploited colorimetric sensing of heavy emtal ions, but from last decade different capping and stabilizing agents such as amino acids, vitmains, acids and ploymers were used to functionalize the metal surface of metal nanoparticles. These capping agents prevent the agglomeration of nanoparticles and make them more active for prolong period of time. This review covers a comprehensive work carried out for colorimetric detection of heavy metals based on metal nanoparticles from the year 2014 to onwards.
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Affiliation(s)
- Ali Hyder
- National Centre of Excellence in Analytical Chemistry, University of Sindh, 76080, Jamshoro, Pakistan
| | - Jamil A Buledi
- National Centre of Excellence in Analytical Chemistry, University of Sindh, 76080, Jamshoro, Pakistan
| | - Muhammad Nawaz
- National Centre of Excellence in Analytical Chemistry, University of Sindh, 76080, Jamshoro, Pakistan
| | - Dhani B Rajpar
- National Centre of Excellence in Analytical Chemistry, University of Sindh, 76080, Jamshoro, Pakistan
| | - Zia-Ul-Hassan Shah
- Department of Soil Science, Sindh Agriculture University, Tandojam, Pakistan
| | - Yasin Orooji
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China.
| | - Mehmet Lütfi Yola
- Hasan Kalyoncu University, Faculty of Health Sciences, Department of Nutrition and Dietetics, Gaziantep, Turkey
| | - Hassan Karimi-Maleh
- Department of Chemical Engineering and Energy, Quchan University of Technology, Quchan, Iran.
| | - Hongjun Lin
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China
| | - Amber R Solangi
- National Centre of Excellence in Analytical Chemistry, University of Sindh, 76080, Jamshoro, Pakistan.
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3
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Simple and highly sensitive 2-hydroxy-1,4-naphthoquinone/glassy carbon sensor for the electrochemical detection of [Ni(CN)4]2− in metallurgical industry wastewater. J APPL ELECTROCHEM 2022. [DOI: 10.1007/s10800-022-01691-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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4
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El-Rab SMFG, Basha S, Ashour AA, Enan ET, Alyamani AA, Felemban NH. Green Synthesis of Copper Nano-Drug and Its Dental Application upon Periodontal Disease-Causing Microorganisms. J Microbiol Biotechnol 2021; 31:1656-1666. [PMID: 34489380 PMCID: PMC9706032 DOI: 10.4014/jmb.2106.06008] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 09/04/2021] [Accepted: 09/06/2021] [Indexed: 12/15/2022]
Abstract
Dental pathogens lead to chronic diseases like periodontitis, which causes loss of teeth. Here, we examined the plausible antibacterial efficacy of copper nanoparticles (CuNPs) synthesized using Cupressus macrocarpa extract (CME) against periodontitis-causing bacteria. The antimicrobial properties of CME-CuNPs were then assessed against oral microbes (M. luteus. B. subtilis, P. aerioginosa) that cause periodontal disease and were identified using morphological/ biochemical analysis, and 16S-rRNA techniques. The CME-CuNPs were characterized, and accordingly, the peak found at 577 nm using UV-Vis spectrometer showed the formation of stable CME-CuNPs. Also, the results revealed the formation of spherical and oblong monodispersed CME-CuNPs with sizes ranged from 11.3 to 22.4 nm. The FTIR analysis suggested that the CME contains reducing agents that consequently had a role in Cu reduction and CME-CuNP formation. Furthermore, the CME-CuNPs exhibited potent antimicrobial efficacy against different isolates which was superior to the reported values in literature. The antibacterial efficacy of CME-CuNPs on oral bacteria was compared to the synergistic solution of clindamycin with CME-CuNPs. The solution exhibited a superior capacity to prevent bacterial growth. Minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), and fractional inhibitory concentration (FIC) of CME-CuNPs with clindamycin recorded against the selected periodontal disease-causing microorganisms were observed between the range of 2.6-3.6 μg/ml, 4-5 μg/ml and 0.312-0.5, respectively. Finally, the synergistic antimicrobial efficacy exhibited by CME-CuNPs with clindamycin against the tested strains could be useful for the future development of more effective treatments to control dental diseases.
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Affiliation(s)
- Sanaa M. F. Gad El-Rab
- Department of Biotechnology, Faculty of Science, Taif University, P.O. Box 888, Taif 21974, KSA,Department of Botany and Microbiology, Faculty of Science, Assiut University, Assiut 71516, Egypt,Corresponding author Phone: +00201025475454 E-mail:
| | - Sakeenabi Basha
- Department of Preventive and Community Dentistry, Faculty of Dentistry, Taif University, Taif 26571, Saudi Arabia
| | - Amal A. Ashour
- Department of Oral and Maxillofacial Surgery and Diagnostic Sciences, Oral Pathology Division, Faculty of Dentistry, Taif University, Taif 21431, Saudi Arabia
| | - Enas Tawfik Enan
- Dental Biomaterials, Faculty of Dentistry, Taif University, Taif 26571, Saudi Arabia,Dental Biomaterials, Faculty of Dentistry, Mansoura University, Dakahleya 35516, Egypt
| | - Amal Ahmed Alyamani
- Department of Biotechnology, Faculty of Science, Taif University, P.O. Box 888, Taif 21974, KSA
| | - Nayef H. Felemban
- Preventive dentistry department, Faculty of Dentistry, Taif University, Taif 26571, Saudi Arabia
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Abdollahiyan P, Hasanzadeh M, Pashazadeh-Panahi P, Seidi F. Application of Cys A@AuNPs supported amino acids towards rapid and selective identification of Hg(II) and Cu(II) ions in aqueous solution: An innovative microfluidic paper-based (μPADs) colorimetric sensing platform. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117020] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Rotake D, Darji A, Kale N. Fabrication, calibration, and preliminary testing of microcantilever-based piezoresistive sensor for BioMEMS applications. IET Nanobiotechnol 2021; 14:357-368. [PMID: 32691737 DOI: 10.1049/iet-nbt.2019.0277] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
In this study, the authors demonstrate the fabrication, calibration, and testing of a piezoresistive microcantilever-based sensor for biomedical microelectromechanical system (BioMEMS) application. To use any sensor in BioMEMS application requires surface modification to capture the targeted biomolecules. The surface alteration comprises self-assembled monolayer (SAM) formation on gold (Au)/chromium (Cr) thin films. So, the Au/Cr coating is essential for most of the BioMEMS applications. The fabricated sensor uses the piezoresistive technique to capture the targeted biomolecules with the SAM/Au/Cr layer on top of the silicon dioxide layer. The stiffness (k) of the cantilever-based biosensor is a crucial design parameter for the low-pressure range and also influence the sensitivity of the microelectromechanical system-based sensor. Based on the calibration data, the average stiffness of the fabricated microcantilever with and without Au/Cr thin film is 141.39 and 70.53 mN/m, respectively, which is well below the maximum preferred range of stiffness for BioMEMS applications. The fabricated sensor is ultra-sensitive and selective towards Hg2+ ions in the presence of other heavy metal ions (HMIs) and good enough to achieve a lower limit of detection 0.75 ng/ml (3.73 pM/ml).
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Affiliation(s)
- Dinesh Rotake
- Electronics Engineering Department, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India.
| | - Anand Darji
- Electronics Engineering Department, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, India
| | - Nitin Kale
- NanoSniff Technologies Pvt. Ltd, Indian Institute of Technology (IITB) Research Park, Old CSE Building, Powai, Mumbai-76, India
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7
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Ding L, Zhao Y, Li H, Zhang Q, Yang W, Pan Q. A Simple Colorimetric Probe for Sensitive Detection of Hg
2+
Based on MnO
2
Nanosheets and Monothioglycerol. ChemistrySelect 2020. [DOI: 10.1002/slct.202002969] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Lu Ding
- Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education School of Science Hainan University Haikou 570228 China
| | - Yanyu Zhao
- Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education School of Science Hainan University Haikou 570228 China
| | - Huihui Li
- Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education School of Science Hainan University Haikou 570228 China
| | - Qiujuan Zhang
- Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education School of Science Hainan University Haikou 570228 China
| | - Weiting Yang
- Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education School of Science Hainan University Haikou 570228 China
| | - Qinhe Pan
- Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education School of Science Hainan University Haikou 570228 China
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Sengan M, Kamlekar RK, Veerappan A. Highly selective rapid colorimetric sensing of Pb 2+ ion in water samples and paint based on metal induced aggregation of N-decanoyltromethamine capped gold nanoparticles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 239:118485. [PMID: 32450540 DOI: 10.1016/j.saa.2020.118485] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 05/06/2020] [Accepted: 05/12/2020] [Indexed: 06/11/2023]
Abstract
Lead is highly toxic. The detection of lead in the environmental bodies is difficult, because it is colourless and odourless. Herein, we report the synthesis of gold nanoparticles (AuNPs) using the interdigitized vesicles formed by N-decanoyltromethamine (NDTM). AuNPs stabilized by NDTM was pink in colour with spherical shape and the size is 29 ± 7 nm. The optical property of the NDTM-AuNPs was explored for the first time to detect toxic chemical, Pb2+. The addition of toxic metal ion Pb2+ to NDTM-AuNPs rapidly (< 1 min) alters the colour from pink to violet due to aggregation, which was confirmed by particle size analyser and TEM. The aggregation induced colour changes were realized via broad spectra in UV-Vis spectroscopy. NDTM-AuNPs showed a selective and sensitive spectrophotometric signal with Pb2+ when compared with other metal ions. The colorimetric change as a function of Pb2+ concentration gave a linear response in the range of 0-30 μM (R2 = 0.9942). The detection limit was found at 10 μM by naked eye and 0.35 μM by spectrophotometry. The proposed method was successfully applied for the determination of Pb2+ ions in tap water and sewage water. Moreover, as a proof of concept, the NDTM-AuNPs sensor system was applied for the detection of lead in commercial paints. The results of the quantitative estimation of lead in paints by NDTM-AuNPs colorimetric sensor were as good as the standard method, atomic absorption spectroscopy.
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Affiliation(s)
- Megarajan Sengan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613 401, Tamil Nadu, India
| | - Ravi Kanth Kamlekar
- Department of Chemistry, School of Advanced Sciences, VIT, Vellore, Tamil Nadu 632014, India
| | - Anbazhagan Veerappan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613 401, Tamil Nadu, India.
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9
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Hao Z, Xu N, Feng Y, Chen Y, Xiao C, Zhang X. Polyacrylonitrile homogeneous blend hollow fiber membrane with stable structure as a substrate to support Fe/Mn oxide and its enhanced capability to purify dye wastewater. JOURNAL OF POLYMER ENGINEERING 2020. [DOI: 10.1515/polyeng-2019-0378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Blending different molecular weight polyacrylonitrile (PAN) was adopted to solve the shrinkage problem of high molecular weight PAN hollow fiber membrane, to enhance the application performance of low molecular weight PAN membrane, and to adjust the porosity, pore size distribution, and hydrophilicity of the end product. The structurally-optimized membrane was chosen as a substrate to support Fe/Mn oxides and then used as a reactor to remove dyes from their solutions in the presence of H2O2. The results showed that the flux of methylene blue (MB) aqueous solution was 83.7 L/m2 h for the PAN homogeneous blend membrane, much higher than 29.1 L/m2 h of high molecular weight PAN membrane; MB removal efficiency was 97.3%, higher than 62.3% of low molecular weight PAN membrane, and it could be reused 25 times to remove dyes from their solutions without any loss in removal efficiency. The membrane was also found to have the application advantages of decreasing H2O2 dosage, reducing operation pressure, and raising MB removal efficiency compared with other membranes reported in the pieces of literature. Therefore, we were confident that the hollow fiber membrane fabricated by us would exhibit great application potential in the field of decontaminating dye wastewater.
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Affiliation(s)
- Zhifen Hao
- State Key Laboratory of Separation Membranes and Membrane Processes, College of Material Science and Engineering , Tiangong University , No. 399 Binshui West Road, Xiqing District , Tianjin, 300387 , PR China
| | - Naiku Xu
- State Key Laboratory of Separation Membranes and Membrane Processes, College of Material Science and Engineering , Tiangong University , No. 399 Binshui West Road, Xiqing District , Tianjin, 300387 , PR China
| | - Yan Feng
- State Key Laboratory of Separation Membranes and Membrane Processes, College of Material Science and Engineering , Tiangong University , No. 399 Binshui West Road, Xiqing District , Tianjin, 300387 , PR China
| | - Yu Chen
- State Key Laboratory of Separation Membranes and Membrane Processes, College of Material Science and Engineering , Tiangong University , No. 399 Binshui West Road, Xiqing District , Tianjin, 300387 , PR China
| | - Changfa Xiao
- State Key Laboratory of Separation Membranes and Membrane Processes, College of Material Science and Engineering , Tiangong University , No. 399 Binshui West Road, Xiqing District , Tianjin, 300387 , PR China
| | - Xiangwu Zhang
- Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry, and Science, Wilson College of Textiles , North Carolina State University , Raleigh , NC , USA
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Yaqub A, Malkani N, Shabbir A, Ditta SA, Tanvir F, Ali S, Naz M, Kazmi SAR, Ullah R. Novel Biosynthesis of Copper Nanoparticles Using Zingiber and Allium sp. with Synergic Effect of Doxycycline for Anticancer and Bactericidal Activity. Curr Microbiol 2020; 77:2287-2299. [PMID: 32535649 DOI: 10.1007/s00284-020-02058-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 05/25/2020] [Indexed: 01/28/2023]
Abstract
Copper nanoparticles (CuNPs), due to their cost-effective synthesis, interesting properties, and a wide range of applications in conductive inks, cooling fluids, biomedical field, and catalysis, have attracted the attention of scientific community in recent years. The aim of the present study was to develop and characterize antibacterial and anticancer CuNPs synthesized via chemical and biological methods, and further synthesize CuNPs conjugated with doxycycline to study their synergic effect. During the chemical synthesis, ascorbic acid was used as a stabilizing agent, while Zingiber officinale and Allium sativum-derived extracts were used during the biological methods for synthesis of CuNPs. Characterization of CuNPs was performed by transmission electron microscopy (TEM), UV-visible spectroscopy, Fourier transform infrared spectroscopy (FTIR), and X-ray crystallography (XRD). Antimicrobial evaluation of the nanomaterials against Pseudomonas aeruginosa and Escherichia coli was performed by using disk diffusion method, while anticancer behavior against HeLa and HepG2 cell lines was studied by MTT assay. TEM revealed spherical-shaped nanoparticles with mean size of 22.70 ± 5.67, 35.01 ± 5.84, and 19.02 ± 2.41 nm for CuNPs, Gin-CuNPs, and Gar-CuNPs, respectively, and surface plasmon resonance peaks were obtained at 570 nm, 575 nm, and 610 nm for CuNPs, Gar-CuNPs, and Gin-CuNPs, respectively. The results of FTIR confirmed the consumption of biomolecules from the plant extracts for the synthesis of CuNPs. XRD analysis also confirmed synthesis of CuNPs. Doxycycline-conjugated NPs exhibited more antibacterial effects than doxycycline or CuNPs alone. Copper nanoparticles prepared by biological synthesis are cost-effective and eco-friendly as compared to their chemical counterparts. The chemically synthesized nanoparticles displayed more significant antimicrobial activity when capped with doxycycline than Z. officinale and A. sativum-mediated CuNPs; however, green-synthesized nanoparticles showed greater anticancer activity than their chemical counterparts.
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Affiliation(s)
- Atif Yaqub
- Department of Zoology, Government College University, Lahore, 54000, Pakistan.
| | - Naila Malkani
- Department of Zoology, Government College University, Lahore, 54000, Pakistan
| | - Arifa Shabbir
- Department of Zoology, Government College University, Lahore, 54000, Pakistan
| | - Sarwar Allah Ditta
- Department of Zoology, Government College University, Lahore, 54000, Pakistan
| | - Fouzia Tanvir
- Department of Zoology, Government College University, Lahore, 54000, Pakistan
| | - Shaista Ali
- Department of Chemistry, Government College University, Lahore, 54000, Pakistan
| | - Misbah Naz
- Department of Chemistry, Government College University, Lahore, 54000, Pakistan
| | | | - Rehan Ullah
- Department of Zoology, Government College University, Lahore, 54000, Pakistan
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11
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Raj SI, Jaiswal A, Uddin I. Ultrasmall aqueous starch-capped CuS quantum dots with tunable localized surface plasmon resonance and composition for the selective and sensitive detection of mercury(ii) ions. RSC Adv 2020; 10:14050-14059. [PMID: 35498474 PMCID: PMC9051936 DOI: 10.1039/c9ra09306k] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Accepted: 03/17/2020] [Indexed: 01/03/2023] Open
Abstract
Ultrasmall starch-capped CuS quantum dots (QDs) with controllable size were chemically fabricated in an aqueous medium. The phase of the CuS QDs was confirmed via X-ray diffraction (XRD), whereas the characteristic localized surface plasmon resonance (LSPR) peak in the near-infrared (NIR) region was measured using UV-Vis spectroscopy. Transmission electron microscopy and high bandgap analysis confirmed the formation of ultrasmall CuS QDs in the size range of 4-8 nm. CuS QDs have been used for the selective and sensitive detection of Hg2+ ions through colorimetric and spectroscopic techniques. The selective sensing of Hg2+ ions from various metal ions was detected via a remarkable change in color, damping in LSPR intensity, significant change in the Fourier-transform infrared spectra and X-ray photoelectron spectroscopic measurements. The mechanism of interaction between the CuS QDs and Hg2+ ions has been deeply explored in terms of the role played by the starch and the reorganization of sulfide and disulfide bonds to facilitate the access of Hg2+ ions into the CuS lattice. Finally, an intermediate Cu2-x Hg x S nanostructure resulted in the leaching of Cu+ ions into the solution, which were further recovered and reused for the formation of fluorescent Cu2S nanoparticles. Thus, the entire process of synthesis, sensing and reuse paves the way for sustainable nanotechnology.
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Affiliation(s)
- S Irudhaya Raj
- Department of Chemistry, Indira Gandhi National Tribal University Amarkantak MP India
| | - Adhish Jaiswal
- Department of Chemistry, Indira Gandhi National Tribal University Amarkantak MP India
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