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H Krishne D, Sharma K, Reddy AJ, Koppal VV. Exploring the molecular binding mechanism of 6-fluoro, 4-hydroxy, 2- methyl quinoline with TiO 2 nanoparticles: A spectroscopic, thermodynamic, and insights into the solvatochromic effect. J Fluoresc 2024:10.1007/s10895-024-03829-z. [PMID: 38958908 DOI: 10.1007/s10895-024-03829-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2024] [Accepted: 06/24/2024] [Indexed: 07/04/2024]
Abstract
This study investigates the interaction between titanium oxide nanoparticles (TiO2 NPs) and the heterocyclic fluorophore 6-fluoro,4-hydroxy,2-methylquinoline (6-FHMQ), aiming to understand fluorescence quenching mechanisms and thermodynamic characteristics. Spectroscopic techniques including spectrofluorometry (FL) and spectrophotometry (UV-Vis) were used, with a lifetime decay (τ) of 0.18 ns for 6-FHMQ measured using time correlated single photon counting (TCSPC). The interaction between 6-FHMQ and TiO2 NPs revealed a mix of static and dynamic fluorescence quenching mechanisms, with increasing quenching constants (Ksv) and a higher bimolecular quenching rate constant (Kq). The dynamic nature was highlighted by a temperature-dependent increase in binding sites from 1 to ~ 2. Spontaneous complexation was affirmed by negative change in free energy (ΔG), with negative change in enthalpy (ΔH) and a positive change in entropy (ΔS) values indicating favorable electrostatic and ionic interactions. The impact of varying TiO2 NP concentrations on 6-FHMQ absorption was analyzed using the Benesi-Hildbrand equation, with a quantum yield of 0.61 determined. By forster resonance energy transfer (FRET) theory, the proximity between 6-FHMQ and TiO2 NPs was found to be less than 70 Å. Ground and excited state dipole moments of 6-FHMQ in different solvents were calculated to demonstrate solvent sensing ability and charge transfer properties. Ultimately, this study serves as a testament to the power of scientific innovation in the realms of drug delivery and tissue engineering.
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Affiliation(s)
- Deepa H Krishne
- Department of Physics, M S Ramaiah Institute of Technology (Affiliated to VTU), Bangalore, 560054, Karnataka, India.
| | - Kalpana Sharma
- Department of Physics, M S Ramaiah Institute of Technology (Affiliated to VTU), Bangalore, 560054, Karnataka, India
| | - A Jagannatha Reddy
- Department of Physics, M S Ramaiah Institute of Technology (Affiliated to VTU), Bangalore, 560054, Karnataka, India
| | - V V Koppal
- Department of Physics, KLE Technological University, Hubli, 580031, Karnataka, India
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Arjunan N, Thiruvengadam V, Sushil SN. Nanoparticle-mediated dsRNA delivery for precision insect pest control: a comprehensive review. Mol Biol Rep 2024; 51:355. [PMID: 38400844 DOI: 10.1007/s11033-023-09187-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Accepted: 12/19/2023] [Indexed: 02/26/2024]
Abstract
Nanoparticle-based delivery systems have emerged as powerful tools in the field of pest management, offering precise and effective means of delivering double-stranded RNA (dsRNA), a potent agent for pest control through RNA interference (RNAi). This comprehensive review aims to evaluate and compare various types of nanoparticles for their suitability in dsRNA delivery for pest management applications. The review begins by examining the unique properties and advantages of different nanoparticle materials, including clay, chitosan, liposomes, carbon, gold and silica. Each material's ability to protect dsRNA from degradation and its potential for targeted delivery to pests are assessed. Furthermore, this review delves into the surface modification strategies employed to enhance dsRNA delivery efficiency. Functionalization with oligonucleotides, lipids, polymers, proteins and peptides is discussed in detail, highlighting their role in improving stability, cellular uptake, and specificity of dsRNA delivery.This review also provides valuable guidance on choosing the most suitable nanoparticle-based system for delivering dsRNA effectively and sustainably in pest management. Moreover, it identifies existing knowledge gaps and proposes potential research directions aimed at enhancing pest control strategies through the utilization of nanoparticles and dsRNA.
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Affiliation(s)
- Nareshkumar Arjunan
- Division of Molecular Entomology, Department of Zoology, School of Life Sciences, Periyar University, Salem, 636011, India.
| | - Venkatesan Thiruvengadam
- Division of Genomic Resources, ICAR-National Bureau of Agricultural Insect Resources, H.A. Farm Post, Hebbal, P.B. No. 2491, Bangalore, 560024, India.
| | - S N Sushil
- Division of Genomic Resources, ICAR-National Bureau of Agricultural Insect Resources, H.A. Farm Post, Hebbal, P.B. No. 2491, Bangalore, 560024, India
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Silina EV, Ivanova OS, Manturova NE, Medvedeva OA, Shevchenko AV, Vorsina ES, Achar RR, Parfenov VA, Stupin VA. Antimicrobial Activity of Citrate-Coated Cerium Oxide Nanoparticles. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:354. [PMID: 38392727 PMCID: PMC10893433 DOI: 10.3390/nano14040354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 02/01/2024] [Accepted: 02/07/2024] [Indexed: 02/24/2024]
Abstract
The purpose of this study was to investigate the antimicrobial activity of citrate-stabilized sols of cerium oxide nanoparticles at different concentrations via different microbiological methods and to compare the effect with the peroxidase activity of nanoceria for the subsequent development of a regeneration-stimulating medical and/or veterinary wound-healing product providing new types of antimicrobial action. The object of this study was cerium oxide nanoparticles synthesized from aqueous solutions of cerium (III) nitrate hexahydrate and citric acid (the size of the nanoparticles was 3-5 nm, and their aggregates were 60-130 nm). Nanoceria oxide sols with a wide range of concentrations (10-1-10-6 M) as well as powder (the dry substance) were used. Both bacterial and fungal strains (Bacillus subtilis, Bacillus cereus, Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Proteus vulgaris, Candida albicans, Aspergillus brasielensis) were used for the microbiological studies. The antimicrobial activity of nanoceria was investigated across a wide range of concentrations using three methods sequentially; the antimicrobial activity was studied by examining diffusion into agar, the serial dilution method was used to detect the minimum inhibitory and bactericidal concentrations, and, finally, gas chromatography with mass-selective detection was performed to study the inhibition of E. coli's growth. To study the redox activity of different concentrations of nanocerium, we studied the intensity of chemiluminescence in the oxidation reaction of luminol in the presence of hydrogen peroxide. As a result of this study's use of the agar diffusion and serial dilution methods followed by sowing, no significant evidence of antimicrobial activity was found. At the same time, in the current study of antimicrobial activity against E. coli strains using gas chromatography with mass spectrometry, the ability of nanoceria to significantly inhibit the growth and reproduction of microorganisms after 24 h and, in particular, after 48 h of incubation at a wide range of concentrations, 10-2-10-5 M (48-95% reduction in the number of microbes with a significant dose-dependent effect) was determined as the optimum concentration. A reliable redox activity of nanoceria coated with citrate was established, increasing in proportion to the concentration, confirming the oxidative mechanism of the action of nanoceria. Thus, nanoceria have a dose-dependent bacteriostatic effect, which is most pronounced at concentrations of 10-2-10-3 M. Unlike the effects of classical antiseptics, the effect was manifested from 2 days and increased during the observation. To study the antimicrobial activity of nanomaterials, it is advisable not to use classical qualitative and semi-quantitative methods; rather, the employment of more accurate quantitative methods is advised, in particular, gas chromatography-mass spectrometry, during several days of incubation.
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Affiliation(s)
- Ekaterina Vladimirovna Silina
- Department of Pathological Physiology, Sklifosovsky Institute of Clinical Medicine, I.M. Sechenov First Moscow State Medical University (Sechenov University), 119991 Moscow, Russia;
| | - Olga Sergeevna Ivanova
- Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Science, Leninskiy Pr., 31, Bldg. 4, 119071 Moscow, Russia;
| | - Natalia Evgenevna Manturova
- Department of Plastic and Reconstructive Surgery, Cosmetology and Cell Technologies, Pirogov Russian National Research Medical University, 117997 Moscow, Russia;
| | - Olga Anatolyevna Medvedeva
- Department of Microbiology, Virology, Immunology, Kursk State Medical University, Karl Marx St, 3, 305041 Kursk, Russia; (O.A.M.); (A.V.S.); (E.S.V.)
| | - Alina Vladimirovna Shevchenko
- Department of Microbiology, Virology, Immunology, Kursk State Medical University, Karl Marx St, 3, 305041 Kursk, Russia; (O.A.M.); (A.V.S.); (E.S.V.)
| | - Ekaterina Sergeevna Vorsina
- Department of Microbiology, Virology, Immunology, Kursk State Medical University, Karl Marx St, 3, 305041 Kursk, Russia; (O.A.M.); (A.V.S.); (E.S.V.)
| | - Raghu Ram Achar
- Division of Biochemistry, School of Life Sciences, Mysuru, JSS Academy of Higher Education and Research, Mysuru 570015, Karnataka, India;
| | - Vladimir Anatolevich Parfenov
- Department of Pathological Physiology, Sklifosovsky Institute of Clinical Medicine, I.M. Sechenov First Moscow State Medical University (Sechenov University), 119991 Moscow, Russia;
| | - Victor Aleksandrovich Stupin
- Department of Hospital Surgery No.1, Pirogov Russian National Research Medical University, 117997 Moscow, Russia;
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