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Microwave-assisted green synthesis of fluorescent carbon quantum dots from Mexican Mint extract for Fe3+ detection and bio-imaging applications.
Architha, Natarajan; Ragupathi, Murugesan; Shobana, Chellappan; Selvankumar, Thangasamy; Kumar, Ponnuchamy; Lee, Yun Sung; Kalai Selvan, Ramakrishnan.
Afiliação
  • Architha N; Department of Physics, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India.
  • Ragupathi M; Department of Physics, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India.
  • Shobana C; Department of Zoology, Kongunadu Arts and Science College (Autonomous), G. N. Mills, Coimbatore, 641 029, India.
  • Selvankumar T; Department of Biotechnology, Mahendra Arts & Science College, Kalippatti, Namakkal, 637501, Tamil Nadu, India.
  • Kumar P; Department of Animal Health and Management, Alagappa University, Karaikudi, 630 003, India.
  • Lee YS; Faculty of Applied Chemical Engineering, Chonnam National University, Gwangju, 500-757, South Korea.
  • Kalai Selvan R; Department of Physics, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India. Electronic address: selvankram@buc.edu.in.
Environ Res ; 199: 111263, 2021 08.
Article em En | MEDLINE | ID: mdl-33939978
Biomass-derived carbon quantum dots have drawn special interest owing to their admirable photostability, biocompatibility, fluorescence, high solubility, sensitivity and environmentally friendly properties. In the present work, the Carbon Quantum Dots (CQDs) was synthesized from the Plectranthus amboinicus (Mexican Mint) leaves via the microwave-assisted reflux method. The strong absorption peaks observed from UV-vis spectra at 291 and 330 nm corresponds to the π-π* and n-π* transitions, respectively, reveal the formation of CQDs. The synthesized CQDs showed bright blue fluorescence under UV irradiation with a fluorescence quantum yield of 17% and a maximum emission of 436 nm in the blue region at an excitation wavelength of 340 nm. The HRTEM analysis elucidates that the synthesized CQDs were crystalline and spherical in shape with a particle size of 2.43 ± 0.02 nm. The FT-IR spectroscopy confirms the presence of the different functional groups such as -OH, -CH, CO and C-O. The chemical composition of CQD was revealed through XPS analysis. The synthesized CQDs were used as a fluorescent probe to detect different metal ions, where high selectivity was obtained for Fe3+ ions through quenching phenomenon. The emission intensity of CQD showed a good linear relationship with R2 = 0.9111 with the concentration of Fe3+ ions in the range of 0-15 µM. The fluorescence emission of CQD was turned OFF upon the binding of Fe3+ ions and turned - ON with the addition of ascorbic acid. With this fluorescent turn ON-OFF behaviour of CQD, the NOT and IMPLICATION logic gates were constructed and studied for different input conditions. The biocompatibility of CQD was tested via MTT assay using MCF7 breast cancer cell line, which revealed that CQD synthesized from the Mexican Mint leaves possess less cytotoxicity. Further, the prepared CQD was applied effectively as fluorescent probes in a cell imaging application.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Mentha / Pontos Quânticos Tipo de estudo: Diagnostic_studies País/Região como assunto: Mexico Idioma: En Revista: Environ Res Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Índia País de publicação: Holanda
Texto completo
Adicionar na Minha BVS
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Mentha / Pontos Quânticos Tipo de estudo: Diagnostic_studies País/Região como assunto: Mexico Idioma: En Revista: Environ Res Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Índia País de publicação: Holanda