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Liang M, Di H, Hong Y, Song L, Dai J, Yang K, Zhang L. Inhibition of Fe4Ge3O12 formation in the leaching process of zinc oxide dust containing germanium by ultrasonic and iron powder. ARAB J CHEM 2023. [DOI: 10.1016/j.arabjc.2023.104794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023] Open
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2
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S S, Pasha MA. Catalyst-free ultrasound assisted novel one pot pseudo five component synthesis of aryl-bis-[1H-pyrazol-5-ol-4-yl]methanes, het(aryl)-bis-[1H-pyrazol-5-ol-4-yl]methanes and their 1-phenyl derivatives in aqueous medium. GREEN SYNTHESIS AND CATALYSIS 2022. [DOI: 10.1016/j.gresc.2022.03.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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3
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Kim J, Lee J. Acoustic Power Measurement and Thermal Bioeffect Evaluation of Therapeutic Langevin Transducers. SENSORS 2022; 22:s22020624. [PMID: 35062584 PMCID: PMC8779280 DOI: 10.3390/s22020624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 01/10/2022] [Accepted: 01/12/2022] [Indexed: 12/01/2022]
Abstract
We recently proposed an analytical design method of Langevin transducers for therapeutic ultrasound treatment by conducting parametric study to estimate the effect of compression force on resonance characteristics. In this study, experimental investigations were further performed under various electrical conditions to observe the acoustic power of the fully equipped transducer and to assess its heat-related bioeffect. Thermal index (TI) tests were carried out to examine temperature rise and thermal damage induced by the acoustic energy in fatty porcine tissue. Acoustic power emission, TI values, temperature characteristics, and depth/size of thermal ablation were measured as a function of transducer’s driving voltage. By exciting the transducer with 300 Vpp sinusoidal continuous waveform, for instance, the average power was 23.1 W and its corresponding TI was 4.1, less than the 6 specified by the Food and Drug Administration (FDA) guideline. The maximum temperature and the depth of the affected site were 74.5 °C and 19 mm, respectively. It is shown that thermal ablation is likely to be more affected by steep heat surge for a short duration rather than by slow temperature rise over time. Hence, the results demonstrate the capability of our ultrasonic transducer intended for therapeutic procedures by safely interrogating soft tissue and yet delivering enough energy to thermally stimulate the tissue in depth.
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Martínez RF, Cravotto G, Cintas P. Organic Sonochemistry: A Chemist's Timely Perspective on Mechanisms and Reactivity. J Org Chem 2021; 86:13833-13856. [PMID: 34156841 PMCID: PMC8562878 DOI: 10.1021/acs.joc.1c00805] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Indexed: 01/17/2023]
Abstract
Sonochemistry, the use of sound waves, usually within the ultrasonic range (>20 kHz), to boost or alter chemical properties and reactivity constitutes a long-standing and sustainable technique that has, however, received less attention than other activation protocols despite affordable setups. Even if unnecessary to underline the impact of ultrasound-based strategies in a broad range of chemical and biological applications, there is considerable misunderstanding and pitfalls regarding the interpretation of cavitational effects and the actual role played by the acoustic field. In this Perspective, with an eye on mechanisms in particular, we discuss the potentiality of sonochemistry in synthetic organic chemistry through selected examples of past and recent developments. Such examples illustrate specific controlling effects and working rules. Looking back at the past while looking forward to advancing the field, some essentials of sonochemical activation will be distilled.
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Affiliation(s)
- R. Fernando Martínez
- Department
of Organic and Inorganic Chemistry, Faculty of Sciences, and IACYS-Green
Chemistry and Sustainable Development Unit, University of Extremadura, 06006 Badajoz, Spain
| | - Giancarlo Cravotto
- Dipartimento
di Scienza e Tecnologia del Farmaco, Universita
degli Studi di Torino, via P. Giuria 9, Torino 10125, Italy
| | - Pedro Cintas
- Department
of Organic and Inorganic Chemistry, Faculty of Sciences, and IACYS-Green
Chemistry and Sustainable Development Unit, University of Extremadura, 06006 Badajoz, Spain
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5
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Fernández GA, Schiel MA, Silbestri GF. On the catalytic activation of water-soluble NHC-Au(I) complexes by sonication and microwave irradiation: A comparative assessment. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121452] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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6
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Trujillo FJ. A strict formulation of a nonlinear Helmholtz equation for the propagation of sound in bubbly liquids. Part II: Application to ultrasonic cavitation. ULTRASONICS SONOCHEMISTRY 2020; 65:105056. [PMID: 32172147 DOI: 10.1016/j.ultsonch.2020.105056] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Revised: 12/22/2019] [Accepted: 03/03/2020] [Indexed: 06/10/2023]
Abstract
This paper addresses one of the greatest challenges in sonochemistry that has impaired scaling up ultrasonic processes, which is the lack of models capable of predicting the pressure distribution in sonoreactors. This work studies the effect of acoustic pressure on the transmission of sound thought cavitating bubbly liquids by utilizing the nonlinear Helmholtz equation that was demonstrated on the paper part I. The model showed that the wave number and the attenuation can be estimated from the bubble dynamics of inertial bubbles and the local bubble density. The linear model of Commander and Prosperetti is encompassed by the nonlinear model. The model was employed to predict the pressure distribution below an ultrasonic horn tip achieving a relatively close prediction of the experimental data and certainly an accurate qualitative description of the distribution of the pressure field in spite of the simplifications of the model and the assumptions of unknown variables such as the bubble density, bubble distribution and the vessel boundary conditions.
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7
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Synthesis and assessment of a novel ionic material for removing polycyclic aromatic hydrocarbons with ultrasound. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2016.11.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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8
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Ultrasound-assisted catalyst-free phenol-yne reaction for the synthesis of new water-soluble chitosan derivatives and their nanoparticles with enhanced antibacterial properties. Int J Biol Macromol 2019; 139:103-113. [DOI: 10.1016/j.ijbiomac.2019.07.203] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 07/24/2019] [Accepted: 07/29/2019] [Indexed: 01/10/2023]
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9
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Navarro-Brull FJ, Teixeira AR, Giri G, Gómez R. Enabling low power acoustics for capillary sonoreactors. ULTRASONICS SONOCHEMISTRY 2019; 56:105-113. [PMID: 31101244 DOI: 10.1016/j.ultsonch.2019.03.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 03/08/2019] [Accepted: 03/12/2019] [Indexed: 06/09/2023]
Abstract
Capillary reactors demonstrate outstanding potential for on-demand flow chemistry applications. However, non-uniform distribution of multiphase flows, poor solid handling, and the risk of clogging limit their usability for continuous manufacturing. While ultrasonic irradiation has been traditionally applied to address some of these limitations, their acoustic efficiency, uniformity and scalability to larger reactor systems are often disregarded. In this work, high-speed microscopic imaging reveals how cavitation-free ultrasound can unclog and prevent the blockage of capillary reactors. Modeling techniques are then adapted from traditional acoustic designs and applied to simulate and prototype sonoreactors with wider and more uniform sonication areas. Blade-, block- and cylindrical shape sonotrodes are optimized to accommodate longer capillary lengths in sonoreactors resonating at 28 kHz. Finally, a novel helicoidal capillary sonoreactor is proposed to potentially deal with a high concentration of solid particles in miniaturized flow chemistry. The acoustic designs and first principle rationalization presented here offer a transformative step forward in the scale-up of efficient capillary sonoreactors.
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Affiliation(s)
- Francisco J Navarro-Brull
- Institut Universitari d'Electroquímica i Departament de Química Física, Universitat d'Alacant, Apartat 99, E-03080 Alicante, Spain
| | - Andrew R Teixeira
- Department of Chemical Engineering, Worcester Polytechnic Institute, Worcester, MA 01609, United States
| | - Gaurav Giri
- Department of Chemical Engineering, University of Virginia, Charlottesville, VA 22904, United States
| | - Roberto Gómez
- Institut Universitari d'Electroquímica i Departament de Química Física, Universitat d'Alacant, Apartat 99, E-03080 Alicante, Spain.
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10
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Tachallait H, Driowya M, Álvarez E, Benhida R, Bougrin K. Water Promoted One-pot Three-Step Synthesis of Novel N-Saccharin Isoxazolines/Isoxazoles Using KI/Oxone Under Ultrasonic Activation. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190621115726] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A green and efficient regioselective protocol was developed for the preparation
of novel isoxazolines and isoxazoles of N-saccharin derivatives via the water-promoted cycloaddition
reaction of nitrile oxides with alkenes and alkynes. It is noteworthy that
KI/Oxone/water-promoted one-pot three-component reactions of aldehyde, hydroxylamine
hydrochloride, and alkene or alkyne were observed to be very satisfactory. The synthesis
of all adducts (4a-j/5a-j) has been carried out by this method with high to excellent yields
(70-95%) at 25°C within 30 min, using ultrasonic probe. All the new compounds were
thoroughly characterized by spectroscopic techniques and also 5b, 5c and 5f were structurally
identified by single-crystal X-ray diffraction methods. X-ray crystallography structure
analysis clearly supported the regioselectivity of the cycloaddition reaction.
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Affiliation(s)
- Hamza Tachallait
- Department of Chemistry, Equipe de Chimie des Plantes et de Synthese Organique et Bioorganique, URAC23, Faculty of Science, B.P. 1014, GEOPAC Research Center, Mohammed V University, Rabat, Morocco
| | - Mohsine Driowya
- Department of Chemistry, Equipe de Chimie des Plantes et de Synthese Organique et Bioorganique, URAC23, Faculty of Science, B.P. 1014, GEOPAC Research Center, Mohammed V University, Rabat, Morocco
| | - Eleuterio Álvarez
- Instituto de Investigaciones Quimicas, CSICUniversidad de Sevilla, Avda. Americo Vespucio, 49, Isla de La Cartuja, 41092 Sevilla, Spain
| | - Rachid Benhida
- Universite Cote d'Azur, CNRS, Institut de Chimie de Nice UMR 7272, 06108 Nice, France
| | - Khalid Bougrin
- Department of Chemistry, Equipe de Chimie des Plantes et de Synthese Organique et Bioorganique, URAC23, Faculty of Science, B.P. 1014, GEOPAC Research Center, Mohammed V University, Rabat, Morocco
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11
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Liu L, Cai R, Wang Y, Tao G, Ai L, Wang P, Yang M, Zuo H, Zhao P, Shen H, Umar A, He H. Preparation and Characterization of AgNPs In Situ Synthesis on Polyelectrolyte Membrane Coated Sericin/Agar Film for Antimicrobial Applications. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E1205. [PMID: 30011809 PMCID: PMC6073696 DOI: 10.3390/ma11071205] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 06/29/2018] [Accepted: 07/09/2018] [Indexed: 11/17/2022]
Abstract
Antibacterial materials are of great importance in preventing bacterial adhesion and reproduction in daily life. Silver nanoparticle (AgNP) is a broad-spectrum antibacterial nanomaterial that has attracted significant attentions for its ability to endow natural materials with antibacterial ability. Silk sericin (SS) has a great advantage for biomaterial application, as it is a natural protein with excellent hydrophilicity and biodegradability. In this study, we prepared AgNPs and polyelectrolyte membrane (PEM) modified SS/Agar films through the layer-by-layer adsorption technique and ultraviolet-assisted AgNPs synthesis method. The film was well characterized by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction, fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy. Other properties such as water contact angle, wettability and tensile strength, the release of silver were also studied. The antimicrobial activity of AgNPs-PEM-SS/Agar film was investigated against Escherichia coli and Staphylococcus aureus as the model microorganisms by the inhibition zone and bacterial growth curve assays. The results suggested that the AgNPs-PEM-SS/Agar film had excellent mechanical performance, high hydrophilicity, prominent water absorption ability, as well as outstanding and durable antibacterial activity. Therefore, the prepared novel AgNPs-PEM-SS/Agar composite film is proposed as a potentially favorable antibacterial biomaterial for biomedical applications.
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Affiliation(s)
- Liying Liu
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China.
| | - Rui Cai
- College of Biotechnology, Southwest University, Chongqing 400715, China.
| | - Yejing Wang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China.
- College of Biotechnology, Southwest University, Chongqing 400715, China.
| | - Gang Tao
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China.
| | - Lisha Ai
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China.
| | - Peng Wang
- College of Biotechnology, Southwest University, Chongqing 400715, China.
| | - Meirong Yang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China.
| | - Hua Zuo
- College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, China.
| | - Ping Zhao
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China.
- Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing 400715, China.
| | - Hong Shen
- College of Resources and Environment, Southwest University, Chongqing 400715, China.
| | - Ahmad Umar
- Department of Chemistry, College of Science and Arts and Promising Centre for Sensors and Electronics Devices (PCSED), Najran University, P.O. Box: 1988, Najran 11001, Saudi Arabia.
| | - Huawei He
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, China.
- Chongqing Engineering and Technology Research Center for Novel Silk Materials, Southwest University, Chongqing 400715, China.
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12
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Alaoui S, Driowya M, Demange L, Benhida R, Bougrin K. Ultrasound-assisted facile one-pot sequential synthesis of novel sulfonamide-isoxazoles using cerium (IV) ammonium nitrate (CAN) as an efficient oxidant in aqueous medium. ULTRASONICS SONOCHEMISTRY 2018; 40:289-297. [PMID: 28946427 DOI: 10.1016/j.ultsonch.2017.07.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2016] [Revised: 05/23/2017] [Accepted: 07/10/2017] [Indexed: 06/07/2023]
Abstract
A series of novel 3,5-disubstituted isoxazoles have been synthesized, using a new, green, and versatile "one-pot three-steps" methodology. The key step is an oxidative 1,3-dipolar cycloaddition under ultrasonic irradiation, occurring in aqueous media, and mediated by cerium (IV) ammonium nitrate (CAN). CAN is a one-electron oxidant, highly soluble in water, slightly toxic and inexpensive, that allows the in situ conversion of the intermediate aldoximes into nitrile oxide. The syntheses are highly regioselective, as illustrated by the structures of the final compounds, which have been fully assessed by spectral analyses (1H and 13C NMR, MS). This study illustrates the potency of the ultrasound activation to synthesize a set of highly functionalized heterocycles, with potential applications in biology, in short reaction times and following an eco-friendly process.
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Affiliation(s)
- Soukaina Alaoui
- Laboratoire de Chimie des Plantes et de Synthèse Organique et Bioorganique, URAC23, Université Mohammed V, Faculté des Sciences, B.P. 1014 Rabat, Morocco
| | - Mohsine Driowya
- Laboratoire de Chimie des Plantes et de Synthèse Organique et Bioorganique, URAC23, Université Mohammed V, Faculté des Sciences, B.P. 1014 Rabat, Morocco
| | - Luc Demange
- Université Côte d'Azur, Institut de Chimie de Nice, ICN, UMR CNRS 7272, 28 avenue de Valrose, 06108 Nice Cedex 2, France; Département de Chimie, Université Paris Descartes, Sorbonne Paris Cité, UFR des Sciences Pharmaceutiques, 4 avenue de l'Observatoire & UFR Biomédicale des Saints Pères, 45 rue des Saints Pères, 75006 Paris, France
| | - Rachid Benhida
- Université Côte d'Azur, Institut de Chimie de Nice, ICN, UMR CNRS 7272, 28 avenue de Valrose, 06108 Nice Cedex 2, France
| | - Khalid Bougrin
- Laboratoire de Chimie des Plantes et de Synthèse Organique et Bioorganique, URAC23, Université Mohammed V, Faculté des Sciences, B.P. 1014 Rabat, Morocco.
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Zhang Y, Guo Z, Gao Y, Du X. Acoustic wave propagation in bubbly flow with gas, vapor or their mixtures. ULTRASONICS SONOCHEMISTRY 2018; 40:40-45. [PMID: 28389057 DOI: 10.1016/j.ultsonch.2017.03.048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 02/18/2017] [Accepted: 03/27/2017] [Indexed: 06/07/2023]
Abstract
Presence of bubbles in liquids could significantly alter the acoustic waves in terms of wave speed and attenuation. In the present paper, acoustic wave propagation in bubbly flows with gas, vapor and gas/vapor mixtures is theoretically investigated in a wide range of parameters (including frequency, bubble radius, void fraction, and vapor mass fraction). Our finding reveals two types of wave propagation behavior depending on the vapor mass fraction. Furthermore, the minimum wave speed (required for the closure of cavitation modelling in the sonochemical reactor design) is analyzed and the influences of paramount parameters on it are quantitatively discussed.
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Affiliation(s)
- Yuning Zhang
- Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing 102206, China.
| | - Zhongyu Guo
- Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing 102206, China
| | - Yuhang Gao
- Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing 102206, China
| | - Xiaoze Du
- Key Laboratory of Condition Monitoring and Control for Power Plant Equipment, Ministry of Education, North China Electric Power University, Beijing 102206, China
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14
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In Situ Synthesis of Silver Nanoparticles on the Polyelectrolyte-Coated Sericin/PVA Film for Enhanced Antibacterial Application. MATERIALS 2017; 10:ma10080967. [PMID: 28820482 PMCID: PMC5578333 DOI: 10.3390/ma10080967] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 07/26/2017] [Accepted: 08/17/2017] [Indexed: 12/03/2022]
Abstract
To develop silk sericin (SS) as a potential antibacterial biomaterial, a novel composite of polyelectrolyte multilayers (PEMs) coated sericin/poly(vinyl alcohol) (SS/PVA) film modified with silver nanoparticles (AgNPs) has been developed using a layer-by-layer assembly technique and ultraviolet-assisted AgNPs synthesis method. Ag ions were enriched by PEMs via the electrostatic attraction between Ag ions and PEMs, and then reduced to AgNPs in situ with the assistance of ultraviolet irradiation. PEMs facilitated the high-density growth of AgNPs and protected the synthesized AgNPs due to the formation of a 3D matrix, and thus endowed SS/PVA film with highly effective and durable antibacterial activity. Scanning electron microscopy, energy dispersive spectroscopy, X-ray diffractometry, Fourier transfer infrared spectroscopy, water contact angle, mechanical property and thermogravimetric analysis were applied to characterize SS/PVA, PEMs-SS/PVA and AgNPs-PEMs-SS/PVA films, respectively. AgNPs-PEMs-SS/PVA film has exhibited good mechanical performance, hydrophilicity, water absorption capability as well as excellent and durable antibacterial activity against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa and good stability and degradability. This study has developed a simple method to design and prepare AgNPs-PEMs-SS/PVA film for potential antibacterial application.
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17
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Rezki N. A Green Ultrasound Synthesis, Characterization and Antibacterial Evaluation of 1,4-Disubstituted 1,2,3-Triazoles Tethering Bioactive Benzothiazole Nucleus. Molecules 2016; 21:505. [PMID: 27096862 PMCID: PMC6273572 DOI: 10.3390/molecules21040505] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 04/08/2016] [Accepted: 04/12/2016] [Indexed: 11/16/2022] Open
Abstract
The synthesis of N-(benzo[d]thiazol-2-yl)-2-(4-substituted-1H-1,2,3-triazol-1-yl)acetamides 5a–r via the 1,3-dipolar cycloaddition reaction between 2-azido-N-(benzo[d]thiazol-2-yl)acetamide derivatives 3a–c and different alkynes were performed in the presence and absence of ultrasound irradiation. The synthesis was carried out using t-BuOH/H2O (1:1, v/v) as reaction solvents and CuSO4·5H2O/sodium ascorbate as the catalyst. The copper catalyst was implemented to provide the regioselective 1,4-disubstituted 1,2,3-triazoles 5a–r. Significant reductions in reaction times with comparably higher yields were observed when the reactions were carried out under ultrasound irradiation. The structures of the newly synthesized 1,2,3-triazoles were elucidated by IR, NMR, MS, and elemental analyses. They were also screened for their antimicrobial activity against three gram-positive (Streptococcus pneumonia, Bacillus subtilis, and Staphylococcus aureus), three gram-negative (Pseudomonasaeuroginosa, Escherichia coli, and Klebsiella pneumonia), and two fungal strains (Aspergillus fumigates and Candida albicans). Most of the tested compounds displayed promising antimicrobial activities at a Minimum Inhibition Concentration (MIC) of 4–16 μg/mL.
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Affiliation(s)
- Nadjet Rezki
- Department of Chemistry, Faculty of Sciences, Taibah University, Al-Madinah Al-Munawarah 30002, Saudi Arabia.
- Laboratoire de Chimie & Electrochimie des Complexes Métalliques (LCECM), USTO-MB, Department of Chemistry, Faculty of Sciences, University of Sciences, and Technology Mohamed Boudiaf, B.p. 1505 El M'nouar, Oran 31000, Algeria.
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18
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Ultrasound-promoted two-step synthesis of 3-arylselenylindoles and 3-arylthioindoles as novel combretastatin A-4 analogues. Sci Rep 2016; 6:23986. [PMID: 27045272 PMCID: PMC4820744 DOI: 10.1038/srep23986] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 03/17/2016] [Indexed: 02/02/2023] Open
Abstract
A series of 3-(3′-hydroxy-4′-methoxyphenyl)selenyl-5,6,7-trimethoxy-1H-indoles and 3-(3′-hydroxy-4′-methoxyphenyl)thio-5,6,7-trimethoxy-1H-indoles were obtained as a new class of combretastatin A-4 (CA-4) analogues via a convenient ultrasound (US)-assisted two-step process involving 3-selenenylation/sulfenylation followed by O-deallylation. With the assistance of US irradiation, both the reaction rates and yields of selenenylation, sulfenylation and O-deallylation could be significantly improved. A comparison of the reaction rates of O-deallylation and ester reduction demonstrated that O-deallylation was more sensitive to US irradiation. Finally, these products were evaluated for their antiproliferative activities, and most of them showed moderate to potent activities against three human cancer cell lines in vitro.
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19
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Cravotto G, Caporaso M, Jicsinszky L, Martina K. Enabling technologies and green processes in cyclodextrin chemistry. Beilstein J Org Chem 2016; 12:278-94. [PMID: 26977187 PMCID: PMC4778522 DOI: 10.3762/bjoc.12.30] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Accepted: 01/29/2016] [Indexed: 01/05/2023] Open
Abstract
The design of efficient synthetic green strategies for the selective modification of cyclodextrins (CDs) is still a challenging task. Outstanding results have been achieved in recent years by means of so-called enabling technologies, such as microwaves, ultrasound and ball mills, that have become irreplaceable tools in the synthesis of CD derivatives. Several examples of sonochemical selective modification of native α-, β- and γ-CDs have been reported including heterogeneous phase Pd- and Cu-catalysed hydrogenations and couplings. Microwave irradiation has emerged as the technique of choice for the production of highly substituted CD derivatives, CD grafted materials and polymers. Mechanochemical methods have successfully furnished greener, solvent-free syntheses and efficient complexation, while flow microreactors may well improve the repeatability and optimization of critical synthetic protocols.
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Affiliation(s)
- Giancarlo Cravotto
- Dipartimento di Scienza e Tecnologia del Farmaco and NIS - Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, 10125 Turin, Italy
| | - Marina Caporaso
- Dipartimento di Scienza e Tecnologia del Farmaco and NIS - Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, 10125 Turin, Italy
| | - Laszlo Jicsinszky
- Dipartimento di Scienza e Tecnologia del Farmaco and NIS - Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, 10125 Turin, Italy
| | - Katia Martina
- Dipartimento di Scienza e Tecnologia del Farmaco and NIS - Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, 10125 Turin, Italy
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Abstract
The carbon–carbon (C–C) bond forms the ‘backbone’ of nearly every organic molecule, and lies at the heart of the chemical sciences! Let us explore designing of carbon–carbon frameworks at ambient conditions.
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Affiliation(s)
- Goutam Brahmachari
- Laboratory of Natural Products & Organic Synthesis
- Department of Chemistry
- Visva-Bharati (a Central University)
- Santiniketan-731235
- India
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Cappelletti L, Vaghi L, Rinaldi L, Rotolo L, Palmisano G, Cravotto G, Penoni A. One-pot sonochemical synthesis of ferrocenyl derivatives via a three-component reaction in aqueous media. ULTRASONICS SONOCHEMISTRY 2015; 27:30-36. [PMID: 26186817 DOI: 10.1016/j.ultsonch.2015.04.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Revised: 03/28/2015] [Accepted: 04/14/2015] [Indexed: 06/04/2023]
Abstract
An ultrasound-assisted three-component, one-pot domino reaction with ferrocenecarboxaldehyde is herein reported. The sequence of reactions entails the allylindation and dehydrative alkylation of stabilized C-nucleophiles (e.g. electron-rich-(hetero)aromatics and stabilized enols) and N-nucleophiles (e.g. azoles). Sonochemical reactions have been performed in three different high-intensity reactors: a bath (20.3 kHz, 60 W), as well as two cup horns working at 19.9 kHz (75 W) and 300.5 kHz (70 W) giving a library of 18 new ferrocenyl derivatives.
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Affiliation(s)
- Luca Cappelletti
- Dipartimento di Scienza e Alta Tecnologia, University of Insubria, Via Valleggio 11, 22100 Como, Italy
| | - Luca Vaghi
- Dipartimento di Scienza e Alta Tecnologia, University of Insubria, Via Valleggio 11, 22100 Como, Italy
| | - Laura Rinaldi
- Dipartimento di Scienza e Tecnologia del Farmaco and NIS - Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, I-10125 Turin, Italy
| | - Laura Rotolo
- Dipartimento di Scienza e Tecnologia del Farmaco and NIS - Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, I-10125 Turin, Italy
| | - Giovanni Palmisano
- Dipartimento di Scienza e Alta Tecnologia, University of Insubria, Via Valleggio 11, 22100 Como, Italy
| | - Giancarlo Cravotto
- Dipartimento di Scienza e Tecnologia del Farmaco and NIS - Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, I-10125 Turin, Italy
| | - Andrea Penoni
- Dipartimento di Scienza e Alta Tecnologia, University of Insubria, Via Valleggio 11, 22100 Como, Italy
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22
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Vieira BM, Thurow S, Brito JS, Perin G, Alves D, Jacob RG, Santi C, Lenardão EJ. Sonochemistry: An efficient alternative to the synthesis of 3-selanylindoles using CuI as catalyst. ULTRASONICS SONOCHEMISTRY 2015; 27:192-199. [PMID: 26186837 DOI: 10.1016/j.ultsonch.2015.05.012] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 04/29/2015] [Accepted: 05/13/2015] [Indexed: 06/04/2023]
Abstract
Ultrasonic (US) irradiation was successfully used as an alternative energy source to prepare 3-selanylindoles through the direct selanylation of indoles with diorganyl diselenides using CuI (20 mol%) as catalyst and DMSO as the solvent. By using this US-promoted reaction, eleven 3-organylselanylindoles were prepared selectively and in good yields. A comparative study between the reactions under conventional heating, microwave and ultrasound irradiations was performed, and it was observed advantage in using US over the other heating systems.
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Affiliation(s)
- Beatriz M Vieira
- Laboratório de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900 Pelotas, RS, Brazil.
| | - Samuel Thurow
- Laboratório de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900 Pelotas, RS, Brazil.
| | - Juliana S Brito
- Laboratório de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900 Pelotas, RS, Brazil.
| | - Gelson Perin
- Laboratório de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900 Pelotas, RS, Brazil.
| | - Diego Alves
- Laboratório de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900 Pelotas, RS, Brazil.
| | - Raquel G Jacob
- Laboratório de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900 Pelotas, RS, Brazil.
| | - Claudio Santi
- Dipartimento di Chimica e Tecnologia del Farmaco, Group of Catalysis and Green Chemistry, Università degli Studi di Perugia, Perugia, Italy.
| | - Eder J Lenardão
- Laboratório de Síntese Orgânica Limpa - LASOL, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900 Pelotas, RS, Brazil.
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23
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Meng M, He H, Xiao J, Zhao P, Xie J, Lu Z. Controllable in situ synthesis of silver nanoparticles on multilayered film-coated silk fibers for antibacterial application. J Colloid Interface Sci 2015; 461:369-375. [PMID: 26414419 DOI: 10.1016/j.jcis.2015.09.038] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Revised: 09/12/2015] [Accepted: 09/14/2015] [Indexed: 02/02/2023]
Abstract
Layer-by-layer (LbL) assembly is a versatile technique for the preparation of multilayered polymeric films. However, fabrication of LbL polymetic film on silk for the in situ growth of high-density silver nanoparticles (AgNPs) has not been realized. Herein poly(acrylic acid) (PAA)/poly(dimethyldiallylammonium chloride) (PDDA) multilayers are constructed on silk via the LbL approach, subsequently serving as a 3-dimensional matrix for in situ synthesis of AgNPs. After 8 rounds of LbL assembly, the silk is fully covered with a layer of polymeric film. AgNPs with good crystalline structures could be in-situ generated in the silk-coated multilayers and their amount could be tailored by adjusting the bilayer numbers. The as-prepared silk could effectively kill the existing bacteria and inhibit the bacterial growth, demonstrating the antimicrobial activity. Moreover, the release of Ag(+) from the modified silk can last for 120 h, rendering the modified silk sustainable antimicrobial activity. This work may provide a novel method to prepare AgNPs-functionalized antimicrobial silk for potential applications in textile industry.
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Affiliation(s)
- Mei Meng
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China; Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China; Institute for Clean Energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China
| | - Huawei He
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China
| | - Jing Xiao
- Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China; Institute for Clean Energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China
| | - Ping Zhao
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China
| | - Jiale Xie
- Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China; Institute for Clean Energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China
| | - Zhisong Lu
- State Key Laboratory of Silkworm Genome Biology, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China; Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China; Institute for Clean Energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, 1 Tiansheng Road, Chongqing 400715, PR China.
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24
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Cravotto G, Borretto E, Oliverio M, Procopio A, Penoni A. Organic reactions in water or biphasic aqueous systems under sonochemical conditions. A review on catalytic effects. CATAL COMMUN 2015. [DOI: 10.1016/j.catcom.2014.12.014] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Rinaldi L, Martina K, Baricco F, Rotolo L, Cravotto G. Solvent-free copper-catalyzed azide-alkyne cycloaddition under mechanochemical activation. Molecules 2015; 20:2837-49. [PMID: 25671367 PMCID: PMC6272186 DOI: 10.3390/molecules20022837] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Accepted: 02/02/2015] [Indexed: 11/16/2022] Open
Abstract
The ball-mill-based mechanochemical activation of metallic copper powder facilitates solvent-free alkyne-azide click reactions (CuAAC). All parameters that affect reaction rate (i.e., milling time, revolutions/min, size and milling ball number) have been optimized. This new, efficient, facile and eco-friendly procedure has been tested on a number of different substrates and in all cases afforded the corresponding 1,4-disubstituted 1,2,3-triazole derivatives in high yields and purities. The final compounds were isolated in almost quantitative overall yields after simple filtration, making this procedure facile and rapid. The optimized CuAAC protocol was efficiently applied even with bulky functionalized β-cyclodextrins (β-CD) and scaled-up to 10 g of isolated product.
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Affiliation(s)
- Laura Rinaldi
- Dipartimento di Scienza e Tecnologia del Farmaco and NIS-Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, Turin 10125, Italy.
- Dipartimento di Biotecnologie Molecolari e Scienze per la Salute, University of Turin, Via Quarello 15, Turin 10125, Italy.
| | - Katia Martina
- Dipartimento di Scienza e Tecnologia del Farmaco and NIS-Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, Turin 10125, Italy.
| | - Francesca Baricco
- Dipartimento di Scienza e Tecnologia del Farmaco and NIS-Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, Turin 10125, Italy.
| | - Laura Rotolo
- Dipartimento di Scienza e Tecnologia del Farmaco and NIS-Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, Turin 10125, Italy.
| | - Giancarlo Cravotto
- Dipartimento di Scienza e Tecnologia del Farmaco and NIS-Centre for Nanostructured Interfaces and Surfaces, University of Turin, Via P. Giuria 9, Turin 10125, Italy.
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26
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Freitas JJR, Couto TR, Cavalcanti IH, Freitas JCR, Oliveira RA, Menezes PH. Metal free synthesis of homoallylic alcohols promoted by ultrasound. ULTRASONICS SONOCHEMISTRY 2014; 21:1609-1614. [PMID: 24751290 DOI: 10.1016/j.ultsonch.2014.04.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 03/05/2014] [Accepted: 04/01/2014] [Indexed: 06/03/2023]
Abstract
The use of ultrasound irradiation to promote the allylation of aldehydes containing different functionalities with potassium allyltrifluoroborates is described. The method features the use of a minimum amount of acetone as solvent, without any other catalyst or promoter. The products were obtained in high yields, short reaction times, at room temperature and without the need of further purification.
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Affiliation(s)
- Jucleiton José R Freitas
- Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, PE 50740-540, Brazil
| | - Túlio R Couto
- Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, PE 50740-540, Brazil
| | - Italo H Cavalcanti
- Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, PE 50740-540, Brazil
| | - Juliano C R Freitas
- Centro de Educação e Saúde, Universidade Federal de Campina Grande, Olho D'agua da Bica, s/n, Cuité, PB 58175-000, Brazil
| | - Roberta A Oliveira
- Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, PE 50740-540, Brazil
| | - Paulo H Menezes
- Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, PE 50740-540, Brazil.
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27
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Tudela I, Sáez V, Esclapez MD, Díez-García MI, Bonete P, González-García J. Simulation of the spatial distribution of the acoustic pressure in sonochemical reactors with numerical methods: a review. ULTRASONICS SONOCHEMISTRY 2014; 21:909-919. [PMID: 24355287 DOI: 10.1016/j.ultsonch.2013.11.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Revised: 11/12/2013] [Accepted: 11/17/2013] [Indexed: 06/03/2023]
Abstract
Numerical methods for the calculation of the acoustic field inside sonoreactors have rapidly emerged in the last 15 years. This paper summarizes some of the most important works on this topic presented in the past, along with the diverse numerical works that have been published since then, reviewing the state of the art from a qualitative point of view. In this sense, we illustrate and discuss some of the models recently developed by the scientific community to deal with some of the complex events that take place in a sonochemical reactor such as the vibration of the reactor walls and the nonlinear phenomena inherent to the presence of ultrasonic cavitation. In addition, we point out some of the upcoming challenges that must be addressed in order to develop a reliable tool for the proper designing of efficient sonoreactors and the scale-up of sonochemical processes.
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Affiliation(s)
- Ignacio Tudela
- The Functional Materials Applied Research Group, Faculty of Health and Life Sciences, Coventry University, Priory Street, Coventry CV1 5FB, United Kingdom.
| | - Verónica Sáez
- Grupo de Nuevos Desarrollos Tecnológicos en Electroquímica: Sonoelectroquímica y Bioelectroquímica, Departamento de Química Física e Instituto Universitario de Electroquímica, Universidad de Alicante, Ap. Correos 99, 03080 Alicante, Spain
| | - María Deseada Esclapez
- Grupo de Fotoquímica y Electroquímica de Semiconductores, Departamento de Química Física e Instituto Universitario de Electroquímica, Universidad de Alicante, Ap. Correos 99, 03080 Alicante, Spain
| | - María Isabel Díez-García
- Grupo de Fotoquímica y Electroquímica de Semiconductores, Departamento de Química Física e Instituto Universitario de Electroquímica, Universidad de Alicante, Ap. Correos 99, 03080 Alicante, Spain
| | - Pedro Bonete
- Grupo de Fotoquímica y Electroquímica de Semiconductores, Departamento de Química Física e Instituto Universitario de Electroquímica, Universidad de Alicante, Ap. Correos 99, 03080 Alicante, Spain
| | - José González-García
- Grupo de Nuevos Desarrollos Tecnológicos en Electroquímica: Sonoelectroquímica y Bioelectroquímica, Departamento de Química Física e Instituto Universitario de Electroquímica, Universidad de Alicante, Ap. Correos 99, 03080 Alicante, Spain
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28
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Abstract
Seventeen derivatives of α- and β-cyclodextrins were prepared from the cyclodextrin per-6-azide by "click" cyclization with terminal alkynes. Sixteen of these "half-channel" compounds showed significant activity as ion channels in planar bilayer members as assessed by the voltage-clamp technique. Activity ranged from persistent square-top openings to highly erratic conductance; mixed behaviours were evident in virtually all data recorded. Some of the erratic behaviours were shown to follow an apparent power-law distribution of open duration times. The activities observed for the suite were summarized using a model-free activity grid method which displays conductance, duration, and opening behaviour. The overall activity shows the clustering of conductance-duration indicating that activity arises from system properties rather that solely as a property of the compound. The activity grids also support an analysis of structure-activity relationships as they apply to the global behaviour of the compounds and reveal the complexity of a single structure change in controlling the distribution of concurrent conductance behaviours. Transient blockage of channel activity by the hydrophobic guest of the cyclodextrin (1-adamantyl carboxylate) is consistent with the formation of an end-to-end dimer channel among several other competing and interconverting structures.
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Affiliation(s)
- Jonathan K W Chui
- Department of Chemistry, University of Victoria, PO Box 3065, Victoria, BC, Canada V8W 3P6.
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29
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Cravotto G, Gaudino EC, Cintas P. On the mechanochemical activation by ultrasound. Chem Soc Rev 2014; 42:7521-34. [PMID: 23321794 DOI: 10.1039/c2cs35456j] [Citation(s) in RCA: 128] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Chemists have discovered, and recently actively exploited, the fact that subjecting certain molecules to ultrasound waves can bring about transformations that give insight into the correlation between classical tribological processes and the mechanical action caused by collapsing microbubbles when sonic waves propagate through a liquid medium. Chemical transformations induced by ultrasound take place in solution via mechanisms that are markedly different from those associated with molecular activation in the solid state. Both fields, however, share some striking similarities and numerous sonochemical reactions can be rationalized in purely mechanical terms. This tutorial review examines the tribochemical interpretation of sonochemical reactivity and how the multifaceted action of cavitational phenomena determines molecular evolution. A series of case studies involving solids, crystals, and polymers illustrate the mechanical properties of sound waves.
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Affiliation(s)
- Giancarlo Cravotto
- Dipartimento di Scienza e Tecnología del Farmaco, Università di Torino, Via P. Giuria 9, I-10125 Torino, Italy.
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30
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Raju BR, Sampaio DMF, Silva MM, Coutinho PJG, Gonçalves MST. Ultrasound promoted synthesis of Nile Blue derivatives. ULTRASONICS SONOCHEMISTRY 2014; 21:360-366. [PMID: 23769749 DOI: 10.1016/j.ultsonch.2013.05.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 04/17/2013] [Accepted: 05/15/2013] [Indexed: 06/02/2023]
Abstract
Ultrasound irradiation was used for the first time towards the synthesis of new Nile Blue related benzo[a]phenoxazinium chlorides possessing isopentylamino, (2-cyclohexylethyl)amino and phenethylamino groups at 5-position of the heterocyclic system. The efficacy of sonochemistry was investigated with some of our earlier reported synthesis of benzo[a]phenoxazinium chlorides. This newer protocol proved competent in terms of reaction times and enhanced yields. Photophysical studies carried out in ethanol, water and simulated physiological conditions, revealed that emission maxima occurred in the range 644-656 nm, with high fluorescent quantum yields. Other attractive feature exhibited by these materials includes good thermal stability. These properties might be useful in the development of fluorescent probes for biotechnology.
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Affiliation(s)
- B Rama Raju
- Centre of Physics, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal; Centre of Chemistry, University of Minho, Campus of Gualtar, 4710-057 Braga, Portugal
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31
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Koufaki M, Fotopoulou T, Heropoulos GA. Synergistic effect of dual-frequency ultrasound irradiation in the one-pot synthesis of 3,5-disubstituted isoxazoles. ULTRASONICS SONOCHEMISTRY 2014; 21:35-39. [PMID: 23769747 DOI: 10.1016/j.ultsonch.2013.05.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Revised: 05/09/2013] [Accepted: 05/18/2013] [Indexed: 06/02/2023]
Abstract
Herein is reported a one-pot three-step process for the regioselective synthesis of 3,5-disubstituted isoxazoles based on copper(I)-catalyzed cycloaddition reaction between in situ generated nitrile oxides (from the corresponding aldehydes) and alkynes, using ultrasound irradiation, avoiding toxic reagents and solvents and isolation/purification of intermediates. The combined use of 40 kHz ultrasonic bath and 20 kHz probe in the presence of copper turnings reduced reaction time to 1h and resulted in only one final purification step with increased yields, clearly indicating that there is a dual-frequency synergistic effect. In addition, under metal free conditions, the 1,3-dipolar cycloaddition was regioselective giving low to modest yields.
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Affiliation(s)
- Maria Koufaki
- National Hellenic Research Foundation, Institute of Biology, Medicinal Chemistry and Biotechnology, 48, Vas. Constantinou Ave., Athens 11635, Greece.
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32
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Cravotto G, Garella D, Beltramo L, Carnaroglio D, Mantegna S, Roggero CM. Enabling technologies for the rapid dechlorination of polychloroarenes and PCBs. CHEMOSPHERE 2013; 92:299-303. [PMID: 23601125 DOI: 10.1016/j.chemosphere.2013.03.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Revised: 02/23/2013] [Accepted: 03/16/2013] [Indexed: 06/02/2023]
Abstract
Dielectric heating and acoustic cavitation (ultrasound or high-performance disperser) may all dramatically enhance conversion rates and yields in heterogeneous metal-assisted organic reactions even when low reagent excesses are used. These so called "enabling technologies" bring with them process intensification, safer protocols, cost reduction and energy savings. We herein describe a series of rapid polychlorinated aromatic and PCBs dechlorinations (15min) carried out in a moderate excess of metallic sodium and using non-conventional techniques. We compared the results with those obtained for reactions carried out under conventional heating and with those performed with less reactive metals such as magnesium and zinc. In this comparison, high-intensity ultrasound stands out as the technique of choice.
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Affiliation(s)
- Giancarlo Cravotto
- Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Via P. Giuria 9, Torino 10125, Italy.
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33
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Lo Fiego MJ, Badajoz MA, Domini C, Chopa AB, Lockhart MT. Indium-mediated regioselective synthesis of ketones from arylstannanes under solvent-free ultrasound irradiation. ULTRASONICS SONOCHEMISTRY 2013; 20:826-32. [PMID: 23219615 DOI: 10.1016/j.ultsonch.2012.10.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Revised: 10/26/2012] [Accepted: 10/31/2012] [Indexed: 05/14/2023]
Abstract
The solvent-free indium-promoted reaction of alkanoyl chlorides with sterically and electronically diverse arylstannanes is a simple and direct method for the regioselective synthesis of primary, secondary and tertiary alkyl aryl ketones in good to excellent isolated yields (42-84%) under mild and neutral conditions. The protocol is also adequate for the synthesis of aryl vinyl ketones. Reaction times are drastically reduced (from 3-32h to 10-70min) under ultrasonic irradiation. Evidences for the involvement of a homolytic aromatic ipso-substitution mechanism, in which indium metal acts as radical initiator, are presented. It is possible the transference of two aryl groups from tin, thus improving effective mass yield, working with diarylstannanes as starting substrates.
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Affiliation(s)
- Marcos J Lo Fiego
- Instituto de Química del Sur (CONICET-UNS), Departamento de Química, Universidad Nacional del Sur, Avenida Alem 1253, Bahía Blanca B8000CPB, Argentina
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34
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Comparative Studies on Conventional and Ultrasound-Assisted Synthesis of Novel Homoallylic Alcohol Derivatives Linked to Sulfonyl Dibenzene Moiety in Aqueous Media. J CHEM-NY 2013. [DOI: 10.1155/2013/364036] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Novel homoallylic alcohols incorporating sulfone moieties were synthesized by the treatment of different carbonyl compounds with allylic bromides in aqueous mediaviasonochemical Barbier-type reaction conditions. Sulfonation ofα-bromoketones with sodium benzenesulfinate in presence of CuI/2,6-lutidine rapidly gaveβ-keto-sulfones in good yields. In general, ultrasound irradiation offered the advantages of high yields, short reaction times, and simplicity compared to the conventional methods. The structures of all the compounds were confirmed by analytical and spectral data.
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35
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Horkel E. Metalation of Pyridazine, Cinnoline, and Phthalazine. TOPICS IN HETEROCYCLIC CHEMISTRY 2013. [DOI: 10.1007/7081_2012_97] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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36
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Luong M, Domini CE, Silbestri GF, Chopa AB. Ultrasound-assisted synthesis of benzophenones by Stille cross-coupling reactions. Optimization via experimental design. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2012.10.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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37
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Laville M, Babin J, Londono I, Legros M, Nouvel C, Durand A, Vanderesse R, Leonard M, Six JL. Polysaccharide-covered nanoparticles with improved shell stability using click-chemistry strategies. Carbohydr Polym 2012; 93:537-46. [PMID: 23499094 DOI: 10.1016/j.carbpol.2012.11.050] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 11/16/2012] [Accepted: 11/18/2012] [Indexed: 10/27/2022]
Abstract
Dextran-covered PLA nanoparticles have been formulated by two strategies. On one hand, dextran-g-PLA copolymers have been synthesized by click-chemistry between azide-multifunctionalized dextran (DexN3) and alkyne end-functionalized PLA chains (α-alkyne PLA); then nanoprecipitated without any additional surfactants. On the other hand, DexN3 exhibiting surfactant properties have been emulsified with unfunctionalized or α-alkyne PLA, which are dissolved in organic phase with or without CuBr. Depending on the o/w emulsion/evaporation process experimental conditions, dextran-g-PLA copolymers have been produced in situ, by click chemistry at the liquid/liquid interface during the emulsification step. Whatever the process, biodegradable core/shell polymeric nanoparticles have been obtained, then characterized. Colloidal stability of these nanoparticles in the presence of NaCl or SDS has been studied. While the physically adsorbed polysaccharide based shell has been displaced by SDS, the covalently-linked polysaccharide based shell ensures a permanent stability, even in the presence of SDS.
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Affiliation(s)
- Maxime Laville
- Université de Lorraine, Laboratoire de Chimie Physique Macromoléculaire LCPM, UMR 7568, Nancy F-54000, France
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Bandyopadhyay D, Cruz J, Banik BK. Novel synthesis of 3-pyrrole substituted ?-lactams via microwave-induced bismuth nitrate-catalyzed reaction. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.06.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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39
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Soengas RG, Estévez AM. Indium-mediated allylation and Reformatsky reaction on glyoxylic oximes under ultrasound irradiation. ULTRASONICS SONOCHEMISTRY 2012; 19:916-920. [PMID: 22197315 DOI: 10.1016/j.ultsonch.2011.11.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Revised: 11/18/2011] [Accepted: 11/20/2011] [Indexed: 05/31/2023]
Abstract
A novel and more convenient method for the indium-promoted allylation of glyoxylic oximes based on the use of ultrasonic waves is reported. A similar procedure was used to develop the first example reported in the literature of an indium-mediated Reformatsky reaction on oxime ethers.
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Affiliation(s)
- Raquel G Soengas
- Centro Singular de Investigación en Química Biológica y Materiales Moleculares, Campus Vida, Universidad de Santiago de Compostela, c/ Jenaro de la Fuente s/n, 15782 Santiago de Compostela, Spain.
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Stefani HA, Silva NC, Manarin F, Lüdtke DS, Zukerman-Schpector J, Madureira LS, Tiekink ER. Synthesis of 1,2,3-triazolylpyranosides through click chemistry reaction. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.01.102] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Cravotto G, Orio L, Gaudino EC, Martina K, Tavor D, Wolfson A. Efficient synthetic protocols in glycerol under heterogeneous catalysis. CHEMSUSCHEM 2011; 4:1130-1134. [PMID: 21853535 DOI: 10.1002/cssc.201100106] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2011] [Indexed: 05/31/2023]
Abstract
The massive increase in glycerol production from the transesterification of vegetable oils has stimulated a large effort to find novel uses for this compound. Hence, the use of glycerol as a solvent for organic synthesis has drawn particular interest. Drawbacks of this green and renewable solvent are a low solubility of highly hydrophobic molecules and a high viscosity, which often requires the use of a fluidifying co-solvent. These limitations can be easily overcome by performing reactions under high-intensity ultrasound and microwaves in a stand-alone or combined manner. These non-conventional techniques facilitate and widen the use of glycerol as a solvent in organic synthesis. Glycerol allows excellent acoustic cavitation even at high temperatures (70-100 °C), which is otherwise negligible in water. Herein, we describe three different types of applications: 1) the catalytic transfer hydrogenation of benzaldehyde to benzyl alcohol in which glycerol plays the dual role of the solvent and hydrogen donor; 2) the palladium-catalyzed Suzuki cross-coupling; and (3) the Barbier reaction. In all cases glycerol proved to be a greener, less expensive, and safer alternative to the classic volatile organic solvents.
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Affiliation(s)
- Giancarlo Cravotto
- Dipartimento di Scienza e Tecnologia del Farmaco, Università degli Studi di Torino, Via P. Giuria 9, 10125 Torino, Italy.
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