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Kaffash M, Tolou-Shikhzadeh-Yazdi S, Soleimani S, Hoseinpoor S, Saberi MR, Chamani J. Spectroscopy and molecular simulation on the interaction of Nano-Kaempferol prepared by oil-in-water with two carrier proteins: An investigation of protein-protein interaction. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 309:123815. [PMID: 38154302 DOI: 10.1016/j.saa.2023.123815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 11/28/2023] [Accepted: 12/23/2023] [Indexed: 12/30/2023]
Abstract
In this work, the interaction of human serum albumin (HSA) and human holo-transferrin (HTF) with the prepared Nano-Kaempferol (Nano-KMP) through oil-in-water procedure was investigated in the form of binary and ternary systems by the utilization of different spectroscopy techniques along with molecular simulation and cancer cell experiments. According to fluorescence spectroscopy outcomes, Nano-KMP is capable of quenching both proteins as binary systems by a static mechanism, while in the form of (HSA-HTF) Nano-KMP as the ternary system, an unlinear Stern-Volmer plot was elucidated with the occurrence of both dynamic and static fluorescence quenching mechanisms in the binding interaction. In addition, the two acquired Ksv values in the ternary system signified the existence of two sets of binding sites with two different interaction behaviors. The binding constant values of HSA-Nano KMP, HTF-Nano-KMP, and (HSA-HTF) Nano-KMP complexes formation were (2.54 ± 0.03) × 104, (2.15 ± 0.02) × 104 and (1.43 ± 0.04) × 104M-1at the first set of binding sites and (4.68 ± 0.05) × 104 M-1 at the second set of binding sites, respectively. The data of thermodynamic parameters confirmed the major roles of hydrogen binding and van der Waals forces in the formation of HSA-Nano KMP and HTF-Nano KMP complexes. The thermodynamic parameter values of (HSA-HTF) Nano KMP revealed the dominance of hydrogen binding and van der Waals forces in the first set of binding sites and hydrophobic forces for the second set of binding sites. Resonance light scattering (RLS) analysis displayed the existence of a different interaction behavior for HSA-HTF complex in the presence of Nano-KMP as the ternary system. Moreover, circular dichroism (CD) technique affirmed the conformational changes of the secondary structure of proteins as binary and ternary systems. Molecular docking and molecular dynamics simulations (for 100 ns) were performed to investigate the mechanism of KMP binding to HSA, HTF, and HSA-HTF. Next to observing a concentration and time-dependent cytotoxicity, the down regulation of PI3K/AkT/mTOR pathway resulted in cell cycle arrest in SW480 cells.
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Affiliation(s)
- Maryam Kaffash
- Department of Biology, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| | | | - Samane Soleimani
- Department of Biology, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| | - Saeideh Hoseinpoor
- Department of Biology, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| | - Mohammad Reza Saberi
- Department of Medicinal Chemistry, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Jamshidkhan Chamani
- Department of Biology, Mashhad Branch, Islamic Azad University, Mashhad, Iran.
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Liu Q, Luo J, Tang J, Chen Z, Chen Z, Lin Q. Remediation of cadmium and lead contaminated soils using Fe-OM based materials. CHEMOSPHERE 2022; 307:135853. [PMID: 35948099 DOI: 10.1016/j.chemosphere.2022.135853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Revised: 07/18/2022] [Accepted: 07/23/2022] [Indexed: 06/15/2023]
Abstract
Iron oxide-lignin composites (GLS) were prepared based on the significant role of Fe-OM in the environmental behaviour of heavy metals and lignin binding with iron oxide preferentially in soil. GLS was applied in Cd/Pb immobilization and the stability under acid rain was investigated. The results show that the iron oxide appeared weakly crystalline or amorphous similar to 2-line ferrihydrite after the addition of lignin. Agglomerates of nanoparticles with higher adsorption capacity were observed for GLS. The mobility factor (MF) of Cd/Pb in the soil decreased rapidly after adding GLS. At the 3% dosage, the MF of Cd and Pb in the soil was decreased by 58.94% and 78.15% respectively, which was approximately 5 times that of goethite (GE). The mobile and exchangeable Cd/Pb were converted to organic, amorphous Fe oxide-bound and residue fractions. Under acid rain conditions, MF continues to decline for the GLS group, increasing the organic and amorphous Fe oxide-bound fractions, while for control group (CK) and GE, the trend was the opposite. Lignin could inhibit iron oxide dissolution and stabilize the combination of Cd/Pb and iron oxides in soil. The better stability performance of GLS for Cd/Pb may be related to the higher adsorption capacity and microstructural difference after iron oxide combined with lignin.
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Affiliation(s)
- Qianjun Liu
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China.
| | - Jiayi Luo
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China
| | - Jiepeng Tang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China
| | - Zhiliang Chen
- Guangdong Engineering Technology Research Center of Heavy Metal Pollution Control and Restoration in Farmland Soil, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510275, PR China.
| | - Zhaowei Chen
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China
| | - Qintie Lin
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, PR China
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Vinayagam R, Pai S, Murugesan G, Varadavenkatesan T, Narayanasamy S, Selvaraj R. Magnetic activated charcoal/Fe 2O 3 nanocomposite for the adsorptive removal of 2,4-Dichlorophenoxyacetic acid (2,4-D) from aqueous solutions: Synthesis, characterization, optimization, kinetic and isotherm studies. CHEMOSPHERE 2022; 286:131938. [PMID: 34426299 DOI: 10.1016/j.chemosphere.2021.131938] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 07/04/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
Magnetic activated charcoal/Fe2O3 nanocomposite (AC/Fe2O3NC) was fabricated using Spondias dulcis leaf extract by a facile method and used for the adsorptive removal of 2,4-Dichlorophenoxyacetic acid (2,4-D) from aqueous solutions for the first time. The nanocomposite was characterized by methods such as FE-SEM, EDS, XRD, FTIR, TGA, VSM, and BET to identify and confirm the surface morphology, elemental composition, crystalline nature, functional groups, thermal stability, magnetic behavior, and surface area respectively. Box-Behnken Design (BBD) - an optimization method, which belongs to the Response surface methodology (RSM) and a modeling tool - Artificial Neural Network (ANN) were employed to design, optimize and predict the relationship between the input parameters (pH, initial concentration of 2,4-D, time and agitation speed) versus the output parameter (adsorption efficiency of 2,4-D). Adsorption efficiency of 98.12% was obtained at optimum conditions (pH: 2.05, initial concentration: 32 ppm, contact time: 100 min, agitation speed: 130 rpm, temperature: 30 °C, and dosage: 0.2 g/L). The predictive ability of the ANN was superior (R2 = 0.99) than the quadratic model, given by the RSM (R2 = 0.93). The equilibrium data were best-fitted to Langmuir isotherm (R2 = 0.9944) and the kinetics obeyed pseudo-second-order model (R2 = 0.9993) satisfactorily. Thermodynamic studies revealed the spontaneity and exothermic nature of adsorption. The maximum adsorption capacity, qm was found to be 255.10 mg/g, substantially larger than the reported values for 2,4-D adsorption by other magnetic nanoadsorbents. Therefore, this nanoadsorbent may be utilized as an excellent alternative for the elimination of 2,4-D from the waterbodies.
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Affiliation(s)
- Ramesh Vinayagam
- Department of Chemical Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India
| | - Shraddha Pai
- Department of Chemical Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India
| | - Gokulakrishnan Murugesan
- Department of Biotechnology, M.S.Ramaiah Institute of Technology, Bengaluru, 560054, Karnataka, India
| | - Thivaharan Varadavenkatesan
- Department of Biotechnology, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India
| | - Selvaraju Narayanasamy
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - Raja Selvaraj
- Department of Chemical Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, 576104, Karnataka, India.
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Interaction of silver nanoparticles with catechol O-methyltransferase: Spectroscopic and simulation analyses. Biochem Biophys Rep 2021; 26:101013. [PMID: 34027136 PMCID: PMC8131974 DOI: 10.1016/j.bbrep.2021.101013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 04/30/2021] [Accepted: 05/02/2021] [Indexed: 11/24/2022] Open
Abstract
Catechol O-methyltransferase, an enzyme involved in the metabolism of catechol containing compounds, catalyzes the transfer of a methyl group between S-adenosylmethionine and the hydroxyl groups of the catechol. Furthermore it is considered a potential drug target for Parkinson’s disease as it metabolizes the drug levodopa. Consequently inhibitors of the enzyme would increase levels of levodopa. In this study, absorption, fluorescence and infrared spectroscopy as well as computational simulation studies investigated human soluble catechol O-methyltransferase interaction with silver nanoparticles. The nanoparticles form a corona with the enzyme and quenches the fluorescence of Trp143. This amino acid maintains the correct structural orientation for the catechol ring during catalysis through a static mechanism supported by a non-fluorescent fluorophore–nanoparticle complex. The enzyme has one binding site for AgNPs in a thermodynamically spontaneous binding driven by electrostatic interactions as confirmed by negative ΔG and ΔH and positive ΔS values. Fourier transform infrared spectroscopy within the amide I region of the enzyme indicated that the interaction causes relaxation of its β−structures, while simulation studies indicated the involvement of six polar amino acids. These findings suggest AgNPs influence the catalytic activity of catechol O-methyltransferase, and therefore have potential in controlling the activity of the enzyme. A recombinant soluble human catechol O-methyltransferase was inhibited by silver nanoparticles. Inhibition by AgNPs was concentration and size dependent. The binding mechanism was through spontaneous static quenching, driven by positive ΔS, and negative ΔH and ΔG. Stern-Volmer analysis suggested binding of AgNPs with Trp143. In silico indicate relaxation of β-sheets and the interaction of AgNPs with 6 amino acids in the enzyme’s helical structures.
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Liu Q, Tang J, Li X, Lin Q, Xiao R, Zhang M, Yin G, Zhou Y. Effect of lignosulfonate on the adsorption performance of hematite for Cd(II). THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 738:139952. [PMID: 32534277 DOI: 10.1016/j.scitotenv.2020.139952] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 05/25/2020] [Accepted: 06/02/2020] [Indexed: 06/11/2023]
Abstract
Lignin is a precursor of humus in soil and sediment. Lignin can be separated from vascular plants in the form of lignosulfonate via pulping processes. On the other hand, composites of iron oxide and organic matter can adsorb heavy metals, and thus influence the migration of these heavy metals in the environment. In this paper, a hematite/lignosulfonate composite (HLS) was prepared via coprecipitation to compare the adsorption performance of hematite (α-Fe2O3) toward Cd(II) before and after the incorporation of lignosulfonate (LS). The HLS is found to exhibit a weakly crystalline structure and possess a large number of nanoscale particles. Specific surface area of HLS (291.97 m2/g) is about 11 times that of α-Fe2O3, and the pore volume of HLS (0.22 cm3/g) is twice that of α-Fe2O3. The adsorption of Cd(II) is well illustrated by the pseudo-second-order adsorption kinetics and the initial adsorption rate (h) of HLS is 13.83 times that of α-Fe2O3. The maximum adsorption capacities are significantly improved from 4.89-6.35 mg/g (α-Fe2O3) to 39.03-53.65 mg/g (HLS). A greater affinity and more favorable association between Cd(II) and HLS is observed via fitting models. The incorporation of LS provides HLS with significantly better adsorption properties toward Cd(II) than α-Fe2O3, as is further confirmed by FT-IR and XPS characterization. Fe-O-O-H and Fe-O-H structures as well as more hydroxyl groups are observed, which promote the adsorption performance since the process are mainly influenced by complexation via coordination bonds.
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Affiliation(s)
- Qianjun Liu
- Guangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China.
| | - Jiepeng Tang
- Guangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Xiang Li
- Guangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Qintie Lin
- Guangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Rongbo Xiao
- Guangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Min Zhang
- School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China.
| | - Guangcai Yin
- Guangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Yangmei Zhou
- Guangdong Industrial Contaminated Site Remediation Technology and Equipment Engineering Research Center, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
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Jacob JM, Rajan R, Kurup GG. Biologically synthesized ZnS quantum dots as fluorescent probes for lead (II) sensing. LUMINESCENCE 2020; 35:1328-1337. [PMID: 32510819 DOI: 10.1002/bio.3895] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 05/31/2020] [Accepted: 06/02/2020] [Indexed: 12/25/2022]
Abstract
This manuscript presents a robust strategy for selective Pb(II) sensing based on a fluorescence turn-off mechanism using ZnS quantum dots (QDs) biosynthesized using Aspergillus sp. The biogenic nanoprobe displayed marked sensing efficiency in the presence of Pb ions over concentration ranges from 5 to 100 μM with limits of detection of around 2.45 μM. Performance optimization studies revealed that the maximum fluorescence quenching efficiency was obtained in the presence of [ZnS NPs] at 4 mg/ml, and alkaline pH of 10 recorded under stable ambient temperature for approximately 5 min for the quenching process. Advanced morphological analysis indicated that the bio-sensing mechanism was essentially a surface-based phenomenon in which the Pb ions were in very close proximity to the QDs and formed stable ground-state Pb-ZnS complexes, resulting in a quenched fluorescence of the QDs. Simultaneously, a larger fraction of Pb ions interacted via collisions with the excited ZnS QDs and resulted in an effective energy transfer from the excited QDs to the Pb ions, therefore resulting in an obvious decrease in QD fluorescence. These insights were well supported by theoretical analysis using Stern-Volmer plots and sphere-of-action models.
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Affiliation(s)
- Jaya Mary Jacob
- Department of Biotechnology & Biochemical Engineering, Sree Buddha College of Engineering, Pattoor, Alappuzha, Kerala, India
| | - Reju Rajan
- Department of Biotechnology & Biochemical Engineering, Sree Buddha College of Engineering, Pattoor, Alappuzha, Kerala, India
| | - Gayathri G Kurup
- Department of Biotechnology & Biochemical Engineering, Sree Buddha College of Engineering, Pattoor, Alappuzha, Kerala, India
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Mokaberi P, Babayan-Mashhadi F, Amiri Tehrani Zadeh Z, Saberi MR, Chamani J. Analysis of the interaction behavior between Nano-Curcumin and two human serum proteins: combining spectroscopy and molecular stimulation to understand protein-protein interaction. J Biomol Struct Dyn 2020; 39:3358-3377. [DOI: 10.1080/07391102.2020.1766570] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Parisa Mokaberi
- Department of Biology, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| | - Fatemeh Babayan-Mashhadi
- Department of Biology, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| | - Zeinab Amiri Tehrani Zadeh
- Department of Medicinal Chemistry, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohammad Reza Saberi
- Department of Medicinal Chemistry, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Jamshidkhan Chamani
- Department of Biology, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
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Kolosnjaj-Tabi J, Kralj S, Griseti E, Nemec S, Wilhelm C, Plan Sangnier A, Bellard E, Fourquaux I, Golzio M, Rols MP. Magnetic Silica-Coated Iron Oxide Nanochains as Photothermal Agents, Disrupting the Extracellular Matrix, and Eradicating Cancer Cells. Cancers (Basel) 2019; 11:cancers11122040. [PMID: 31861146 PMCID: PMC6966508 DOI: 10.3390/cancers11122040] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 12/11/2019] [Accepted: 12/13/2019] [Indexed: 12/20/2022] Open
Abstract
Cancerous cells and the tumor microenvironment are among key elements involved in cancer development, progression, and resistance to treatment. In order to tackle the cells and the extracellular matrix, we herein propose the use of a class of silica-coated iron oxide nanochains, which have superior magnetic responsiveness and can act as efficient photothermal agents. When internalized by different cancer cell lines and normal (non-cancerous) cells, the nanochains are not toxic, as assessed on 2D and 3D cell culture models. Yet, upon irradiation with near infrared light, the nanochains become efficient cytotoxic photothermal agents. Besides, not only do they generate hyperthermia, which effectively eradicates tumor cells in vitro, but they also locally melt the collagen matrix, as we evidence in real-time, using engineered cell sheets with self-secreted extracellular matrix. By simultaneously acting as physical (magnetic and photothermal) effectors and chemical delivery systems, the nanochain-based platforms offer original multimodal possibilities for prospective cancer treatment, affecting both the cells and the extracellular matrix.
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Affiliation(s)
- Jelena Kolosnjaj-Tabi
- Institute of Pharmacology and Structural Biology, 205 Route de Narbonne, 31400 Toulouse, France; (E.G.); (E.B.); (M.G.); (M.-P.R.)
- Correspondence: (J.K.-T.); (S.K.)
| | - Slavko Kralj
- Department for Materials Synthesis, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia;
- Faculty of Pharmacy, University of Ljubljana, Askerceva cesta 7, 1000 Ljubljana, Slovenia;
- Correspondence: (J.K.-T.); (S.K.)
| | - Elena Griseti
- Institute of Pharmacology and Structural Biology, 205 Route de Narbonne, 31400 Toulouse, France; (E.G.); (E.B.); (M.G.); (M.-P.R.)
| | - Sebastjan Nemec
- Department for Materials Synthesis, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia;
- Faculty of Pharmacy, University of Ljubljana, Askerceva cesta 7, 1000 Ljubljana, Slovenia;
| | - Claire Wilhelm
- Laboratoire Matière et Systèmes Complexes (MSC), UMR 7057, Bâtiment Condorcet, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, 75205 Paris, France;
| | - Anouchka Plan Sangnier
- Faculty of Pharmacy, University of Ljubljana, Askerceva cesta 7, 1000 Ljubljana, Slovenia;
| | - Elisabeth Bellard
- Institute of Pharmacology and Structural Biology, 205 Route de Narbonne, 31400 Toulouse, France; (E.G.); (E.B.); (M.G.); (M.-P.R.)
| | - Isabelle Fourquaux
- Centre de Microscopie Electronique Appliquée à la Biologie (CMEAB), Faculté de Médecine Rangueil, 133 Route de Narbonne, 31400 Toulouse, France;
| | - Muriel Golzio
- Institute of Pharmacology and Structural Biology, 205 Route de Narbonne, 31400 Toulouse, France; (E.G.); (E.B.); (M.G.); (M.-P.R.)
| | - Marie-Pierre Rols
- Institute of Pharmacology and Structural Biology, 205 Route de Narbonne, 31400 Toulouse, France; (E.G.); (E.B.); (M.G.); (M.-P.R.)
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Souza LRR, Bernardes LE, Barbetta MFS, da Veiga MAMS. Iron oxide nanoparticle phytotoxicity to the aquatic plant Lemna minor: effect on reactive oxygen species (ROS) production and chlorophyll a/chlorophyll b ratio. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:24121-24131. [PMID: 31228067 DOI: 10.1007/s11356-019-05713-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 06/07/2019] [Indexed: 06/09/2023]
Abstract
Although iron oxide occurs naturally in the environment, iron oxide nanoparticles have distinct mobility, reactivity, and toxicity, which can harm the human health and nature. This scenario has motivated the investigation of the toxic effects of iron oxide nanoparticles (akaganeite predominance + hematite) on the aquatic plant Lemna minor. First, nanoparticles were synthesized and characterized; then, different iron oxide NP concentrations were added to Lemna minor culture. After 7 days, all the Lemna minor leaves died, irrespective of the added NP concentration. The iron oxide NP impact on the plant was evaluated based on malondialdehyde (MDA) production from thiobarbituric acid reactive substances (TBARS), which was dose-dependent; i.e., lipid peroxidation in the plant increased with rising iron oxide NP concentration. The chlorophyll content decreased at high iron oxide NP concentrations, which disrupted the light absorption mechanism. Fe accumulation in Lemna minor roots also occurred, which can harm nutrient uptake. Therefore, the iron oxide NP toxic impact on plants and related ecosystems requires further studies in order to prevent environmental damage.
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Affiliation(s)
- Lilian Rodrigues Rosa Souza
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes 3900, Monte Alegre, Ribeirão Preto, SP, 14040-901, Brazil
| | - Luís Eduardo Bernardes
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes 3900, Monte Alegre, Ribeirão Preto, SP, 14040-901, Brazil
| | - Maike Felipe Santos Barbetta
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes 3900, Monte Alegre, Ribeirão Preto, SP, 14040-901, Brazil
| | - Márcia Andreia Mesquita Silva da Veiga
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes 3900, Monte Alegre, Ribeirão Preto, SP, 14040-901, Brazil.
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Pattanayak S, Chakraborty S, Biswas S, Chattopadhyay D, Chakraborty M. Degradation of Methyl Parathion, a common pesticide and fluorescence quenching of Rhodamine B, a carcinogen using β-d glucan stabilized gold nanoparticles. JOURNAL OF SAUDI CHEMICAL SOCIETY 2018. [DOI: 10.1016/j.jscs.2018.02.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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The application of hematite (α-Fe2O3) nanoparticles in coagulation and flocculation processes of River Nile Rosetta branch surface water. SN APPLIED SCIENCES 2018. [DOI: 10.1007/s42452-018-0006-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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Cao B, Jiang Z, Li J, Zhang X, Hu Y, Chen J, Zhang Y. Different dissolved organic matter (DOM) characteristics lead to diverse atrazine adsorption traits on the non-rhizosphere and rhizosphere soil of Pennisetum americanum (L.) K. Schum. CHEMOSPHERE 2018; 209:608-616. [PMID: 29957521 DOI: 10.1016/j.chemosphere.2018.06.069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2017] [Revised: 05/19/2018] [Accepted: 06/10/2018] [Indexed: 06/08/2023]
Abstract
Plant activities might alter the environmental behavior of organic pollutants in rhizosphere soil during phytoremediation. To further illustrate the mechanisms underlying the varying adsorption about the different adsorbing abilities of rhizosphere soil (RS) and non-rhizosphere soil (NRS) for the same pollutant, atrazine was selected to investigate the adsorption traits in the NRS and RS of Pennisetum americanum (L.) K. Schum (P. americanum), a potential phytoremediator of atrazine pollution. Furthermore, the different fluorescence spectral properties of the dissolved organic matter (DOM) extracted from RS and NRS when binding with atrazine were also investigated. RS exhibited a higher atrazine adsorption capacity than NRS, although the kinetic and isothermal properties of atrazine adsorption onto the two kinds soil were described by a pseudo second-order model and the Freundlich model. The DOM extracted from RS showed a stronger atrazine-binding ability than that extracted from NRS, as proven by the much more obvious decrease in fluorescence intensity when binding with atrazine. Although synchronous fluorescence spectra analysis suggested that both DOM types bind atrazine using a static fluorescence quenching mechanism, Fourier transform infrared spectroscopy showed that some distinct functional groups, which might liable to combine with atrazine, were found in only the DOM extracted from RS. Considering the findings mentioned above and the fact that the typical chemical characteristics of RS were different from those of NRS, we concluded that the P. americanum enhances the atrazine adsorption ability of RS by regulating the chemical characteristics and atrazine-binding ability of DOM in RS.
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Affiliation(s)
- Bo Cao
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, PR China
| | - Zhao Jiang
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, PR China
| | - Jinmei Li
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, PR China
| | - Xiuyuan Zhang
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, PR China
| | - Yang Hu
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, PR China
| | - Jianing Chen
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, PR China
| | - Ying Zhang
- School of Resources & Environment, Northeast Agricultural University, Harbin, 150030, PR China.
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Mansour SA, Elsad RA, Izzularab MA. Dielectric spectroscopic analysis of polyvinyl chloride nanocomposites loaded with Fe2
O3
nanocrystals. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4359] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sh. A. Mansour
- Advanced Materials/Solar Energy and Environmental Sustainability (AMSEES) Laboratory; Menoufia University, Faculty of Engineering; Shebin El-Kom Egypt
- Basic Engineering Science Department, Faculty of Engineering; Menoufia University; 32511 Shebin El-Kom Egypt
| | - R. A. Elsad
- Basic Engineering Science Department, Faculty of Engineering; Menoufia University; 32511 Shebin El-Kom Egypt
| | - M. A. Izzularab
- Electrical Engineering Department, Faculty of Engineering; Menoufia University; 32511 Shebin El-Kom Egypt
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14
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Mansab S, Rafique U, Akhtar MJ. Synthesis of a cobalt-based photoluminescent coordination complex to study quenching mechanisms of nitro compounds. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1473570] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Saira Mansab
- Department of Environmental Sciences, Fatima Jinnah Women University, Rawalpindi, Pakistan
- Physics Division, Pakistan Institute of Nuclear Science and Technology, Islamabad, Pakistan
| | - Uzaira Rafique
- Department of Environmental Sciences, Fatima Jinnah Women University, Rawalpindi, Pakistan
| | - Muhammad Javed Akhtar
- Physics Division, Pakistan Institute of Nuclear Science and Technology, Islamabad, Pakistan
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15
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Alphandéry E, Abi Haidar D, Seksek O, Thoreau M, Trautmann A, Bercovici N, Gazeau F, Guyot F, Chebbi I. Nanoprobe Synthesized by Magnetotactic Bacteria, Detecting Fluorescence Variations under Dissociation of Rhodamine B from Magnetosomes following Temperature, pH Changes, or the Application of Radiation. ACS APPLIED MATERIALS & INTERFACES 2017; 9:36561-36572. [PMID: 29035036 DOI: 10.1021/acsami.7b09720] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We report a method of fabrication of fluorescent magnetosomes, designated as MCR400, in which 400 μM of rhodamine B are introduced in the growth medium of AMB-1 magnetotactic bacteria and fluorescent magnetosomes are then extracted from these bacteria. These fluorescent magnetosomes behave differently from most fluorescent nanoprobes, which often lead to fluorescence losses over time due to photobleaching. Indeed, when MCR400 are heated to 30-90 °C, brought to an acidic pH, or exposed to radiations, we observed that their fluorescence intensity increased. We attributed this behavior to the dissociation of rhodamine B from the magnetosomes. Interestingly, enhanced fluorescence was also observed in vitro when MCR400 were mixed with either primary macrophages or tumor cells (TC1-GFP or RG2-Cells) or in vivo when MCR400 were introduced in rat glioblastoma. We showed that MCR400 internalize in tumor and immune cells (macrophages) leading to enhanced fluorescence, suggesting that fluorescent magnetosomes could be used during cancer treatments such as magnetic hyperthermia to image cells of interest such as immune or tumor cells.
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Affiliation(s)
- Edouard Alphandéry
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR 7590 CNRS, Sorbonne Universités, UPMC, University Paris 06, Muséum National d'Histoire Naturelle , 4 Place Jussieu, 75005 Paris, France
- Nanobacterie SARL , 36 Boulevard Flandrin, 75116 Paris, France
| | - Darine Abi Haidar
- CNRS UMR 8165, Imagerie et Modelisation en Neurobiologie, et Cancerologie, Paris-Saclay University , Campus d'Orsay, Bêt 440, 91405 Orsay, France
- Paris Diderot University , F-75013, Paris, France
| | - Olivier Seksek
- CNRS UMR 8165, Imagerie et Modelisation en Neurobiologie, et Cancerologie, Paris-Saclay University , Campus d'Orsay, Bêt 440, 91405 Orsay, France
| | | | | | | | - Florence Gazeau
- Laboratoire de Matière et Systèmes Complexes, MSC, Université Paris Diderot , Bâtiment Condorcet, Case 7056, 75205 Paris Cedex 13, France
| | - François Guyot
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR 7590 CNRS, Sorbonne Universités, UPMC, University Paris 06, Muséum National d'Histoire Naturelle , 4 Place Jussieu, 75005 Paris, France
| | - Imène Chebbi
- Nanobacterie SARL , 36 Boulevard Flandrin, 75116 Paris, France
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Belay A, Kim HK, Hwang YH. Spectroscopic study of binding of chlorogenic acid with the surface of ZnO nanoparticles. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2017. [DOI: 10.1134/s0036024417090023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Zhang H, Huang Y, Hu Z, Tong C, Zhang Z, Hu S. Carbon dots codoped with nitrogen and sulfur are viable fluorescent probes for chromium(VI). Mikrochim Acta 2017. [DOI: 10.1007/s00604-017-2132-4] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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18
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Shojaei TR, Salleh MAM, Sijam K, Rahim RA, Mohsenifar A, Safarnejad R, Tabatabaei M. Fluorometric immunoassay for detecting the plant virus Citrus tristeza using carbon nanoparticles acting as quenchers and antibodies labeled with CdTe quantum dots. Mikrochim Acta 2016. [DOI: 10.1007/s00604-016-1867-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Belay A, Kim HK, Hwang YH. Probing the interaction of caffeic acid with ZnO nanoparticles. LUMINESCENCE 2015; 31:654-9. [DOI: 10.1002/bio.3007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 06/25/2015] [Accepted: 07/17/2015] [Indexed: 12/27/2022]
Affiliation(s)
- Abebe Belay
- Department of Nanomaterial Engineering & BK 21 Plus Nanoconvergence Technology Division; Pusan National University; Miryang 627-706 Korea
- Department of Applied Physics, School of Applied Natural Sciences; Adama Science and Technology University; P.O.Box 1888 Adama Ethiopia
| | - Hyung Kook Kim
- Department of Nanomaterial Engineering & BK 21 Plus Nanoconvergence Technology Division; Pusan National University; Miryang 627-706 Korea
| | - Yoon-Hwae Hwang
- Department of Nanomaterial Engineering & BK 21 Plus Nanoconvergence Technology Division; Pusan National University; Miryang 627-706 Korea
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20
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Wang H, Li C, Gao M, Fang F, Wang W, Ma M, Wang X. Effects of room temperature ionic liquids on fluorescence properties of bisphenol A in β-cyclodextrin. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.10.039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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21
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Vedakumari WS, Priya VM, Sastry TP. Deposition of superparamagnetic nanohydroxyapatite on iron–fibrin substrates: Preparation, characterization, cytocompatibility and bioactivity studies. Colloids Surf B Biointerfaces 2014; 120:208-14. [DOI: 10.1016/j.colsurfb.2014.04.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2014] [Revised: 04/02/2014] [Accepted: 04/23/2014] [Indexed: 01/21/2023]
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22
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Effect of folic acid decorated magnetic fluorescent nanoparticles on the sedimentation of starch molecules. INTERNATIONAL NANO LETTERS 2014. [DOI: 10.1007/s40089-014-0104-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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23
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Shen S, Guo X, Wu L, Wang M, Wang X, Kong F, Shen H, Xie M, Ge Y, Jin Y. Dual-core@shell-structured Fe3O4–NaYF4@TiO2 nanocomposites as a magnetic targeting drug carrier for bioimaging and combined chemo-sonodynamic therapy. J Mater Chem B 2014; 2:5775-5784. [DOI: 10.1039/c4tb00841c] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Dual-core@shell-structured Fe3O4–NaYF4@TiO2 nanocomposites as a magnetic targeting drug carrier for bioimaging and combined chemo-sonodynamic therapy.
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Affiliation(s)
- Song Shen
- College of Pharmaceutical Sciences
- Jiangsu University
- Zhenjiang, China
- College of Pharmaceutical Sciences
- Zhejiang University
| | - Xiaomeng Guo
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou, China
| | - Lin Wu
- Affiliated Hospital of Jiangsu University
- Zhenjiang, China
| | - Meng Wang
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou, China
| | - Xinshi Wang
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou, China
| | - Fenfen Kong
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou, China
| | - Haijun Shen
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou, China
| | - Meng Xie
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou, China
| | - Yanru Ge
- College of Pharmaceutical Sciences
- Jiangsu University
- Zhenjiang, China
| | - Yi Jin
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou, China
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25
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Mandal S, Chatterjee N, Das S, Saha KD, Chaudhuri K. Magnetic core–shell nanoprobe for sensitive killing of cancer cells via induction with a strong external magnetic field. RSC Adv 2014. [DOI: 10.1039/c4ra01407c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The title system, composed of a highly magnetic core surrounded by a thin arsenite shell, has been synthesized and applied to the magnetically facilitated targeting of anticancer agent (sodium arsenite) at lower dose with minimal side effects and higher efficacy in a biocompatible manner.
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Affiliation(s)
- Samir Mandal
- Molecular and Human Genetics Division
- CSIR-Indian Institute of Chemical Biology
- Kolkata-700 032, India
| | - Nabanita Chatterjee
- Cancer Biology and Inflammatory Disorder Division
- CSIR-Indian Institute of Chemical Biology
- Kolkata 700032, India
| | - Subhadip Das
- Cancer Biology and Inflammatory Disorder Division
- CSIR-Indian Institute of Chemical Biology
- Kolkata 700032, India
| | - Krishna Das Saha
- Cancer Biology and Inflammatory Disorder Division
- CSIR-Indian Institute of Chemical Biology
- Kolkata 700032, India
| | - Keya Chaudhuri
- Molecular and Human Genetics Division
- CSIR-Indian Institute of Chemical Biology
- Kolkata-700 032, India
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Adeyemi OS, Whiteley CG. Interaction of metal nanoparticles with recombinant arginine kinase from Trypanosoma brucei: thermodynamic and spectrofluorimetric evaluation. Biochim Biophys Acta Gen Subj 2013; 1840:701-6. [PMID: 24184914 DOI: 10.1016/j.bbagen.2013.10.038] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 09/21/2013] [Accepted: 10/25/2013] [Indexed: 10/26/2022]
Abstract
BACKGROUND Trypanosoma brucei, responsible for African sleeping sickness, is a lethal parasite against which there is need for new drug protocols. It is therefore relevant to attack possible biomedical targets with specific preparations and since arginine kinase does not occur in humans but is present in the parasite it becomes a suitable target. METHODS Fluorescence quenching, thermodynamic analysis and FRET have shown that arginine kinase from T. brucei interacted with silver or gold nanoparticles. RESULTS The enzyme only had one binding site. At 25°C the dissociation (Kd) and Stern-Volmer constants (KSV) were 15.2nM, 0.058nM(-1) [Ag]; and 43.5nM, 0.052nM(-1) [Au] and these decreased to 11.2nM, 0.041nM(-1) [Ag]; and 24.2nM, 0.039nM(-1) [Au] at 30°C illustrating static quenching and the formation of a non-fluorescent fluorophore-nanoparticle complex. Silver nanoparticles bound to arginine kinase with greater affinity, enhanced fluorescence quenching and easier access to tryptophan molecules than gold. Negative ΔH and ΔG values implied that the interaction of both Ag and Au nanoparticles with arginine kinase was spontaneous with electrostatic forces. FRET confirmed that the nanoparticles were bound 2.11nm [Ag] and 2.26nm [Au] from a single surface tryptophan residue. CONCLUSIONS The nanoparticles bind close to the arginine substrate through a cysteine residue that controls the electrophilic and nucleophilic characters of the substrate arginine-guanidinium group crucial for enzymatic phosphoryl transfer between ADP and ATP. GENERAL SIGNIFICANCE The nanoparticles of silver and gold interact with arginine kinase from T. brucei and may prove to have far reaching consequences in clinical trials.
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Affiliation(s)
- O S Adeyemi
- Department of Biochemistry, Microbiology & Biotechnology, Rhodes University, Grahamstown, South Africa
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28
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Targeting intracellular compartments by magnetic polymeric nanoparticles. Eur J Pharm Sci 2013; 50:130-8. [DOI: 10.1016/j.ejps.2013.04.004] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Revised: 03/12/2013] [Accepted: 04/08/2013] [Indexed: 11/23/2022]
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29
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Padayachee ER, Whiteley CG. Interaction of glycine zipper fragments of Aβ-peptides with neuronal nitric oxide synthase: kinetic, thermodynamic and spectrofluorimetric analysis. Neuropeptides 2013; 47:171-8. [PMID: 23375441 DOI: 10.1016/j.npep.2012.12.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2012] [Revised: 11/13/2012] [Accepted: 12/24/2012] [Indexed: 01/05/2023]
Abstract
Five peptide fragments [Aβ(17-21); Aβ(25-29); Aβ(29-33); Aβ(33-37); Aβ(25-37)] of the toxic Aβ(1-40(42)) amyloid peptide were shown to bind with neuronal nitric oxide synthase by means of hydrophobic-hydrophobic forces. The enzyme has a single site for the amyloid peptide binding, which resulted in a quenching of the intrinsic fluorescence of the enzyme. Binding constants determined from Stern-Volmer analysis were between 9×10(-3) and 1.8×10(-2) μM(-1). As temperature increased these binding constants increased reflecting that the interaction of the amyloid peptides with nNOS was endothermic and the quenching was dynamic. Kinetic analysis revealed a non-competitive interaction of the amyloid peptides to the enzyme with inhibitor constants of 5.1 μM for Aβ(17-21) to about 8-12 μM for the other peptides. According to the van't Hoff relationship the thermodynamic parameters, ΔH, ΔS and ΔG for the interaction of the amyloid peptides were all positive and between 41.28 and 77.86 kJ mol(-1)K(-1), 104.92 and 220.82 J mol(-1)K(-1) and 9.92 and 13.13 kJ mol(-1)K(-1), respectively. This suggested that the transition state, created by the amyloid peptide-nNOS complex and generated during the initial stages of Aβ aggregation had to, initially, overcome an activation barrier. Since the ΔG values decreased as temperature increased it not only implied a non-spontaneous interaction but that hydrophobic forces were operative during the binding. By FRET analysis the distance between the donor enzyme and the acceptor amyloid peptide was between 2.7 and 2.8 nm. As the temperature increased from 298 K through 313 K (and higher) the fraction of these tryptophan residues that became exposed increased, to approach a value of 1. There was strong support for the initial interaction being through the glycine zipper regions of Aβ(25-37).
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Affiliation(s)
- E R Padayachee
- Department of Biochemistry, Microbiology and Biotechnology, Rhodes University, Grahamstown, South Africa
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30
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Wang H, Mao J, Duan A, Che B, Wang W, Ma M, Wang X. Fluorescence quenching of 4-tert-octylphenol by room temperature ionic liquids and its application. J Fluoresc 2013; 23:323-31. [PMID: 23207872 PMCID: PMC3590417 DOI: 10.1007/s10895-012-1150-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Accepted: 11/20/2012] [Indexed: 11/24/2022]
Abstract
The interactions between room temperature ionic liquids (RTILs) and weak fluorescent chemicals still remain unclear, which hinders the complete and efficient utilization of these "green" solvents in fluorescent analyses of organic chemicals. Herein, we reported the effects of four RTILs, [C8MIM]BF4, [C14MIM]BF4, [C8MIM]PF6 and [C14MIM]PF6, on fluorescence behavior of 4-tert-octylphenol (4-t-OP). In the fortified concentration range of 0.2-1.0 mM, the quenching effects were increased with increasing concentrations of RTILs. However, no obvious variation of peak shape of 4-t-OP was observed in the quenching process, suggesting no formation of ground-state complex between fluorophores in 4-t-OP and quencher (ionic liquids). As for anion effect, the fluorescence quenching efficiency of 4-t-OP by BF4(-) was greater than PF6(-), but the carbon chain length on the imidazolium ring had no significant relationship with fluorescence intensity of 4-t-OP. Both Ksv values (>1.0 × 10(3) L/mol.s) and the different temperature effects demonstrated that the quenching of 4-t-OP by four RTILs was the presence of dynamic and static quenching mechanism. The FI of dansyl chloride within [C8MIM]BF4 increased nearly 5-fold as compared to the control, showing a sensitizing effect on the strong fluorescent chemicals, while a quenching effect on 4-t-OP belonging to weak fluorescent chemicals. The fluorescence-enhanced amplitude of dansyl chloride in [C8MIM]PF6 was greater than [C8MIM]BF4. The fluorescence quenching of 4-t-OP by [C8MIM]PF6 did not belong to FRET phenomenon because of no overlap of emission spectrum of 4-t-OP and absorption spectrum of [C8MIM]PF6. When 0.6 mM [C8MIM]PF6 in acetonitrile was used as the solvent, the detection limit of 4-t-OP was 3.7 μg/L, and the linearity range was 0.01-0.8 mg/L (R(2) = 0.9990). In summary, these results provide a theoretical foundation for the application of RTILs in weak fluorescent chemicals.
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Affiliation(s)
- Huili Wang
- School of Life Science, Wenzhou Medical College, University-Town, Wenzhou, Zhejiang China 325035
| | - Jingwen Mao
- Department of Environmental Science, Wenzhou Medical College, University-Town, Wenzhou, Zhejiang China 325035
| | - Ailian Duan
- Department of Environmental Science, Wenzhou Medical College, University-Town, Wenzhou, Zhejiang China 325035
| | - Baoguang Che
- Department of Environmental Science, Wenzhou Medical College, University-Town, Wenzhou, Zhejiang China 325035
| | - Wenwei Wang
- School of Life Science, Wenzhou Medical College, University-Town, Wenzhou, Zhejiang China 325035
| | - Meiping Ma
- School of Life Science, Wenzhou Medical College, University-Town, Wenzhou, Zhejiang China 325035
| | - Xuedong Wang
- Department of Environmental Science, Wenzhou Medical College, University-Town, Wenzhou, Zhejiang China 325035
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Panchompoo J, Aldous L, Baker M, Wallace MI, Compton RG. One-step synthesis of fluorescein modified nano-carbon for Pd(II) detection via fluorescence quenching. Analyst 2012; 137:2054-62. [PMID: 22421892 DOI: 10.1039/c2an16261j] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Carbon black (CB) nanoparticles modified with fluorescein, a highly fluorescent molecule, were prepared using a facile and efficient methodology. Simply stirring CB in aqueous solution containing fluorescein resulted in the strong physisorption of fluorescein onto the CB surface. The resulting Fluorescein/CB was then characterised by means of X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), fluorescence microscopy and fluorescence spectroscopy. The optimum experimental conditions for fluorescence of Fluorescein/CB viz. fluorescence excitation and emission wavelengths, O(2) removal and the amount of Fluorescein/CB used, were investigated. The Fluorescein/CB was used as a fluorescent probe for the sensitive detection of Pd(II) in water, based on fluorescence quenching. The results demonstrated that the fluorescence intensity of Fluorescein/CB decreased with increasing Pd(II) concentration, and the fluorescence quenching process could be described by the Stern-Volmer equation. The limit of detection (LOD) for the fluorescence quenching of Fluorescein/CB by Pd(II) in aqueous solution was found to be 1.07 μM (based on 3σ). Last, approaches were studied for the removal of Fe(III) which interferes with the fluorescence quenching of Fluorescein/CB. Complexation of Fe(III) with salicylic acid was used to enhance and control the selectivity of Fluorescein/CB sensor towards Pd(II) in the presence of Fe(III).
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Affiliation(s)
- Janjira Panchompoo
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QZ, UK
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