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Janjic J, Larsson MK, Bjällmark A. In-vitro sonothrombolysis using thick-shelled polymer microbubbles - a comparison with thin-shelled microbubbles. Cardiovasc Ultrasound 2020; 18:12. [PMID: 32366318 PMCID: PMC7197129 DOI: 10.1186/s12947-020-00194-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Accepted: 04/16/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Vascular thrombosis can be treated pharmacologically, however, serious shortcomings such as bleeding may occur. Several studies suggest that sonothrombolysis can induce lysis of the clots using ultrasound. Moreover, intravenously injected thin-shelled microbubbles (MBs) combined with ultrasound can further improve clot lysis. Thick-shelled MBs have been used for drug delivery, targeting and multimodal imaging. However, their capability to enhance sonothrombolysis is unknown. In this study, using an in-vitro set-up, the enhancement of clot lysis using ultrasound and thick-shelled MBs was investigated. Thin-shelled MBs was used for comparison. METHOD The main components in the in-vitro set-up was a vessel mimicking phantom, a pressure mearing system and programmable ultrasound machine. Blood clots were injected and entrapped on a pore mesh in the vessel phantom. Four different protocols for ultrasound transmission and MB exposure (7 blood clots/protocol) were considered together with a control test were no MBs and ultrasound were used. For each protocol, ultrasound exposure of 20 min was used. The upstream pressure of the partially occluded mesh was continuously measured to assess clot burden. At the end of each protocol blood clots were removed from the phantom and the clot mass loss was computed. RESULTS For the thick-shelled MBs no difference in clot mass loss compared with the control tests was found. A 10% increase in the clot mass loss compared with the control tests was found when using thin-shelled MBs and low pressure/long pulses ultrasound exposure. Similarly, in terms of upstream pressure over exposure time, no differences were found when using the thick-shelled MBs, whereas thin-shelled MBs showed a 15% decrease achieved within the first 4 min of ultrasound exposure. CONCLUSION No increase in clot lysis was achieved using thick-shelled MBs as demonstrated by no significant change in clot mass or upstream pressure. Although thick-shelled MBs are promising for targeting and drug delivery, they do not enhance clot lysis when considering the ultrasound sequences used in this study. On the other hand, ultrasound in combination with thin-shelled MBs can facilitate thrombolysis when applying long ultrasound pulses with low pressure.
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Affiliation(s)
- Jovana Janjic
- Biosense Webster, Johnson & Johnson Medical, Via del Mare 56, 00071 Pomezia, Rome, Italy
| | - Malin K Larsson
- Karolinska University Hospital, Eugeniavägen 3, SE-171 76, Stockholm, Sweden
| | - Anna Bjällmark
- Department of Natural Science and Biomedicine, School of Health and Welfare, Jönköping University, Gjuterigatan 5, SE-553 18, Jönköping, Sweden.
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Long-term physical evolution of an elastomeric ultrasound contrast microbubble. J Colloid Interface Sci 2019; 540:185-196. [PMID: 30640066 DOI: 10.1016/j.jcis.2018.12.110] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 12/29/2018] [Accepted: 12/31/2018] [Indexed: 01/06/2023]
Abstract
HYPOTHESIS One of the main assets of crosslinked polymer-shelled microbubbles (MBs) as ultrasound-active theranostic agents is the robustness of the shells, combined with the chemical versatility in modifying the surface with ligands and/or drugs. Despite the long shelf-life, subtle modifications occur in the MB shells involving shifts in acoustic, mechanical and structural properties. EXPERIMENTS We carried out a long-term morphological and acoustic evolution analysis on elastomeric polyvinyl-alcohol (PVA)-shelled MBs, a novel platform accomplishing good acoustic and surface performances in one agent. Confocal laser scanning microscopy, acoustic spectroscopy and AFM nanomechanics were integrated to understand the mechanism of PVA MBs ageing. The changes in the MB acoustic properties were framed in terms of shell thickness and viscoelasticity using a linearised oscillation theory, and compared to MB morphology and to nanomechanical analysis. FINDINGS We enlightened a novel, intriguing ageing time evolution of the PVA MBs with double behaviour with respect to a crossover time of ∼50 days. Before, significant changes occur in MB stiffness and shell thickness, mainly due to a massive release of entangled PVA chains. Then, the MB resonance frequency increases together with shell thickening and softening. Our benchmark study is of general interest for emerging viscoelastomeric bubbles towards personalised medicine.
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Capece S, Domenici F, Brasili F, Oddo L, Cerroni B, Bedini A, Bordi F, Chiessi E, Paradossi G. Complex interfaces in "phase-change" contrast agents. Phys Chem Chem Phys 2017; 18:8378-88. [PMID: 26931337 DOI: 10.1039/c5cp07538f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper we report on the study of the interface of hybrid shell droplets encapsulating decafluoropentane (DFP), which exhibit interesting potentialities for ultrasound (US) imaging. The fabrication of the droplets is based on the deposition of a dextran methacrylate layer onto the surface of surfactants. The droplets have been stabilized against coalescence by UV curing, introducing crosslinks in the polymer layer and transforming the shell into an elastomeric membrane with a thickness of about 300 nm with viscoelastic behaviour. US irradiation induces the evaporation of the DFP core of the droplets transforming the particles into microbubbles (MBs). The presence of a robust crosslinked polymer shell introduces an unusual stability of the droplets also during the core phase transition and allows the recovery of the initial droplet state after a few minutes from switching off US. The interfacial tension of the droplets has been investigated by two approaches, the pendant drop method and an indirect method, based on the determination of the liquid ↔ gas transition point of DFP confined in the droplet core. The re-condensation process has been followed by capturing images of single MBs by confocal microscopy. The time evolution of MB relaxation to droplets was analysed in terms of a modified Church model to account for the structural complexity of the MB shell, i.e. a crosslinked polymer layer over a layer of surfactants. In this way the microrheology parameters of the shell were determined. In a previous paper (Chem. Commun., 2013, 49, 5763-5765) we showed that these systems could be used as ultrasound contrast agents (UCAs). In this work we substantiate this view assessing some key features offered by the viscoelastic nature of the droplet shell.
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Affiliation(s)
- Sabrina Capece
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy.
| | - Fabio Domenici
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy. and Dipartimento di Fisica, Università di Roma Sapienza, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Francesco Brasili
- Dipartimento di Fisica, Università di Roma Sapienza, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Letizia Oddo
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy.
| | - Barbara Cerroni
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy.
| | - Angelico Bedini
- INAIL - Settore Ricerca Certificazione e Verifica - DITSIPIA, Via Fontana Candida, 1 Monteporzio Catone, 00040 Italy
| | - Federico Bordi
- Dipartimento di Fisica, Università di Roma Sapienza, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Ester Chiessi
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy.
| | - Gaio Paradossi
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy.
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Oddo L, Cerroni B, Domenici F, Bedini A, Bordi F, Chiessi E, Gerbes S, Paradossi G. Next generation ultrasound platforms for theranostics. J Colloid Interface Sci 2016; 491:151-160. [PMID: 28024192 DOI: 10.1016/j.jcis.2016.12.030] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 12/13/2016] [Accepted: 12/14/2016] [Indexed: 01/05/2023]
Abstract
Microbubbles are a well-established contrast agent which improves diagnostic ultrasound imaging. During the last decade research has focused on expanding their use to include molecular imaging, targeted therapy and imaging modalities other than ultrasound. However, bioadhesion of targeted microbubbles under physiological flow conditions is still difficult to achieve, the main challenge being connected to the poor stability of lipid microbubbles in the body's circulation system. In this article, we investigate the use of polymeric microbubbles based on a poly (vinyl alcohol) shell as an alternative to lipid microbubbles. In particular, we report on the development of microbubble shell modification, using mild reaction conditions, with the aim of designing a multifunctional platform to enable diagnosis and therapy. Superparamagnetic iron oxide nanoparticles and a near infrared fluorescent probe, indocyanine green, are coupled to the bubbles surface in order to support magnetic resonance and fluorescence imaging. Furthermore, anchoring cyclic arginyl-glycyl-aspartic acid (RGD) peptide, and cyclodextrin molecules, allows targeting and drug loading, respectively. Last but not least, shell topography is provided by atomic force microscopy. These applications and features, together with the high echogenicity of poly (vinyl alcohol) microbubbles, may offer a more stable alternative to lipid microbubbles for the development of a multimodal theranostic platform.
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Affiliation(s)
- Letizia Oddo
- Dipartimento di Scienze e Tecnologie Chimiche, Università degli Studi di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy.
| | - Barbara Cerroni
- Dipartimento di Scienze e Tecnologie Chimiche, Università degli Studi di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy.
| | - Fabio Domenici
- Dipartimento di Scienze e Tecnologie Chimiche, Università degli Studi di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy; Dipartimento di Fisica, Università degli Studi di Roma Sapienza, P.le A. Moro 5, 00185 Roma, Italy.
| | - Angelico Bedini
- INAIL, Settore Ricerca, Certificazione e Verifica, DITSPIA, Via Fontana Candida 1, 00040 Monteporzio Catone, Italy.
| | - Federico Bordi
- Dipartimento di Fisica, Università degli Studi di Roma Sapienza, P.le A. Moro 5, 00185 Roma, Italy.
| | - Ester Chiessi
- Dipartimento di Scienze e Tecnologie Chimiche, Università degli Studi di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy.
| | - Stefan Gerbes
- MagForce AG, Max-Planck-Str. 3, 12489 Berlin, Germany.
| | - Gaio Paradossi
- Dipartimento di Scienze e Tecnologie Chimiche, Università degli Studi di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma, Italy.
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5
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Kothapalli SVVN, Wiklund M, Janerot-Sjoberg B, Paradossi G, Grishenkov D. Investigation of polymer-shelled microbubble motions in acoustophoresis. ULTRASONICS 2016; 70:275-283. [PMID: 27261567 DOI: 10.1016/j.ultras.2016.05.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 03/30/2016] [Accepted: 05/19/2016] [Indexed: 06/05/2023]
Abstract
The objective of this paper is to explore the trajectory motion of microsize (typically smaller than a red blood cell) encapsulated polymer-shelled gas bubbles propelled by radiation force in an acoustic standing-wave field and to compare the corresponding movements of solid polymer microbeads. The experimental setup consists of a microfluidic chip coupled to a piezoelectric crystal (PZT) with a resonance frequency of about 2.8MHz. The microfluidic channel consists of a rectangular chamber with a width, w, corresponding to one wavelength of the ultrasound standing wave. It creates one full wave ultrasound of a standing-wave pattern with two pressure nodes at w/4 and 3w/4 and three antinodes at 0, w/2, and w. The peak-to-peak amplitude of the electrical potential over the PZT was varied between 1 and 10V. The study is limited to no-flow condition. From Gor'kov's potential equation, the acoustic contrast factor, Φ, for the polymer-shelled microbubbles was calculated to about -60.7. Experimental results demonstrate that the polymer-shelled microbubbles are translated and accumulated at the pressure antinode planes. This trajectory motion of polymer-shelled microbubbles toward the pressure antinode plane is similar to what has been described for other acoustic contrast particles with a negative Φ. First, primary radiation forces dragged the polymer-shelled microbubbles into proximity with each other at the pressure antinode planes. Then, primary and secondary radiation forces caused them to quickly aggregate at different spots along the channel. The relocation time for polymer-shelled microbubbles was 40 times shorter than that for polymer microbeads, and in contrast to polymer microbeads, the polymer-shelled microbubbles were actuated even at driving voltages (proportional to radiation forces) as low as 1V. In short, the polymer-shelled microbubbles demonstrate the behavior attributed to the negative acoustic contrast factor particles and thus can be trapped at the antinode plane and thereby separated from particles having a positive acoustic contrast factor, such as for example solid particles and cells. This phenomenon could be utilized in exploring future applications, such as bioassay, bioaffinity, and cell interaction studies in vitro in a well-controlled environment.
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Affiliation(s)
- Satya V V N Kothapalli
- Department of Medical Engineering, School of Technology and Health, KTH Royal Institute of Technology, SE-142 51 Stockholm, Sweden
| | - Martin Wiklund
- Department of Applied Physics, KTH-Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - Birgitta Janerot-Sjoberg
- Department of Medical Engineering, School of Technology and Health, KTH Royal Institute of Technology, SE-142 51 Stockholm, Sweden; Department of Clinical Science, Intervention and Technology, Karolinska Institute, SE-142 51 Stockholm, Sweden; Department of Clinical Physiology, Karolinska University Hospital, SE-142 51 Stockholm, Sweden
| | - Gaio Paradossi
- Dipartimento di Chimica, Università di Roma Tor Vergata, 00133 Rome, Italy
| | - Dmitry Grishenkov
- Department of Medical Engineering, School of Technology and Health, KTH Royal Institute of Technology, SE-142 51 Stockholm, Sweden; Department of Clinical Science, Intervention and Technology, Karolinska Institute, SE-142 51 Stockholm, Sweden; Department of Clinical Physiology, Karolinska University Hospital, SE-142 51 Stockholm, Sweden.
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Josefsson L, Larsson MK, Bjällmark A, Emmer Å. Analysis of polyvinyl alcohol microbubbles in human blood plasma using capillary electrophoresis. J Sep Sci 2016; 39:1551-8. [PMID: 26914238 DOI: 10.1002/jssc.201501342] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 02/11/2016] [Accepted: 02/11/2016] [Indexed: 11/07/2022]
Abstract
Recently, a new type of ultrasound contrast agent that consists of air-filled microbubbles stabilized with a shell of polyvinyl alcohol was developed. When superparamagnetic nanoparticles of iron oxide are incorporated in the polymer shell, a multimodal contrast agent can be obtained. The biodistribution and elimination pathways of the polyvinyl alcohol microbubbles are essential to investigate, which is limited with today's techniques. The aim of the present study was, therefore, to develop a method for qualitative and quantitative analysis of microbubbles in biological samples using capillary electrophoresis with ultraviolet detection. The analysis parameters were optimized to a wavelength at 260 nm and pH of the background electrolyte ranging between 11.9 and 12. Studies with high-intensity ultrasonication degraded microbubbles in water showed that degraded products and intact microbubbles could be distinguished, thus it was possible to quantify the intact microbubbles solely. Analysis of human blood plasma spiked with either plain microbubbles or microbubbles with nanoparticles demonstrated that it is possible to separate them from biological components like proteins in these kinds of samples.
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Affiliation(s)
- Leila Josefsson
- Analytical Chemistry, Div. of Applied Physical Chemistry, Dept. of Chemistry, School of Chemical Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Malin K Larsson
- Department of Medical Engineering, School of Technology and Health, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Anna Bjällmark
- Department of Medical Engineering, School of Technology and Health, KTH Royal Institute of Technology, Stockholm, Sweden.,Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden
| | - Åsa Emmer
- Analytical Chemistry, Div. of Applied Physical Chemistry, Dept. of Chemistry, School of Chemical Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden
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7
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Späth A, Graf-Zeiler BA, Paradossi G, Ghugare S, Tzvetkov G, Fink RH. Quantitative X-ray microscopic analysis of individual thermoresponsive microgel particles in aqueous solution. RSC Adv 2016. [DOI: 10.1039/c6ra20142c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The temperature dependent phase transition of individual thermoresponsive microgel particles in aqueous solution has been studied by high resolution soft X-ray transmission microscopy (STXM).
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Affiliation(s)
- Andreas Späth
- Physikalische Chemie II
- ICMM
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
| | - Birgit A. Graf-Zeiler
- Physikalische Chemie II
- ICMM
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
| | - Gaio Paradossi
- Dipartimento di Scienze e Tecnologie Chimiche
- Università di Roma Tor Vergata
- 00133 Roma
- Italy
| | - Shivkumar Ghugare
- Dipartimento di Scienze e Tecnologie Chimiche
- Università di Roma Tor Vergata
- 00133 Roma
- Italy
| | - George Tzvetkov
- Department of Inorganic Chemistry
- Faculty of Chemistry
- University of Sofia
- 1164 Sofia
- Bulgaria
| | - Rainer H. Fink
- Physikalische Chemie II
- ICMM
- Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
- 91058 Erlangen
- Germany
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8
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Poehlmann M, Grishenkov D, Kothapalli SVVN, Härmark J, Hebert H, Philipp A, Hoeller R, Seuss M, Kuttner C, Margheritelli S, Paradossi G, Fery A. On the interplay of shell structure with low- and high-frequency mechanics of multifunctional magnetic microbubbles. SOFT MATTER 2014; 10:214-26. [PMID: 24651844 DOI: 10.1039/c3sm51560e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Polymer-shelled magnetic microbubbles have great potential as hybrid contrast agents for ultrasound and magnetic resonance imaging. In this work, we studied US/MRI contrast agents based on air-filled poly(vinyl alcohol)-shelled microbubbles combined with superparamagnetic iron oxide nanoparticles (SPIONs). The SPIONs are integrated either physically or chemically into the polymeric shell of the microbubbles (MBs). As a result, two different designs of a hybrid contrast agent are obtained. With the physical approach, SPIONs are embedded inside the polymeric shell and with the chemical approach SPIONs are covalently linked to the shell surface. The structural design of hybrid probes is important, because it strongly determines the contrast agent's response in the considered imaging methods. In particular, we were interested how structural differences affect the shell's mechanical properties, which play a key role for the MBs' US imaging performance. Therefore, we thoroughly characterized the MBs' geometric features and investigated low-frequency mechanics by using atomic force microscopy (AFM) and high-frequency mechanics by using acoustic tests. Thus, we were able to quantify the impact of the used SPIONs integration method on the shell's elastic modulus, shear modulus and shear viscosity. In summary, the suggested approach contributes to an improved understanding of structure-property relations in US-active hybrid contrast agents and thus provides the basis for their sustainable development and optimization.
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Affiliation(s)
- Melanie Poehlmann
- Department of Physical Chemistry II, University of Bayreuth, Universitätsstraße 30, DE-95440 Bayreuth, Germany.
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Brismar TB, Grishenkov D, Gustafsson B, Härmark J, Barrefelt A, Kothapalli SVVN, Margheritelli S, Oddo L, Caidahl K, Hebert H, Paradossi G. Magnetite nanoparticles can be coupled to microbubbles to support multimodal imaging. Biomacromolecules 2012; 13:1390-9. [PMID: 22458325 DOI: 10.1021/bm300099f] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Microbubbles (MBs) are commonly used as injectable ultrasound contrast agent (UCA) in modern ultrasonography. Polymer-shelled UCAs present additional potentialities with respect to marketed lipid-shelled UCAs. They are more robust; that is, they have longer shelf and circulation life, and surface modifications are quite easily accomplished to obtain enhanced targeting and local drug delivery. The next generation of UCAs will be required to support not only ultrasound-based imaging methods but also other complementary diagnostic approaches such as magnetic resonance imaging or computer tomography. This work addresses the features of MBs that could function as contrast agents for both ultrasound and magnetic resonance imaging. The results indicate that the introduction of iron oxide nanoparticles (SPIONs) in the poly(vinyl alcohol) shell or on the external surface of the MBs does not greatly decrease the echogenicity of the host MBs compared with the unmodified one. The presence of SPIONs provides enough magnetic susceptibility to the MBs to accomplish good detectability both in vitro and in vivo. The distribution of SPIONs on the shell and their aggregation state seem to be key factors for the optimization of the transverse relaxation rate.
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Affiliation(s)
- Torkel B Brismar
- Department of Clinical Science, Intervention and Technology at Karolinska Institutet, Division of Medical Imaging and Technology, Stockholm, Sweden
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Graf-Zeiler B, Fink RH, Tzvetkov G. In Situ Synchrotron Radiation X-Ray Microspectroscopy of Polymer Microcontainers. Chemphyschem 2011; 12:3503-9. [PMID: 21853515 DOI: 10.1002/cphc.201100370] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2011] [Indexed: 11/09/2022]
Affiliation(s)
- Birgit Graf-Zeiler
- Department Chemie und Pharmazie, Physikalische Chemie II, Universität Erlangen-Nürnberg and Interdisciplinary Center for Molecular Materials (ICMM), Egerlandstrasse 3, 91058 Erlangen, Germany
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11
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Ghugare SV, Chiessi E, Fink R, Gerelli Y, Scotti A, Deriu A, Carrot G, Paradossi G. Structural Investigation on Thermoresponsive PVA/Poly(methacrylate-co-N-isopropylacrylamide) Microgels across the Volume Phase Transition. Macromolecules 2011. [DOI: 10.1021/ma200979h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shivkumar V. Ghugare
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, 000133 Roma, Italy
| | - Ester Chiessi
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, 000133 Roma, Italy
| | - Rainer Fink
- Physikalische Chemie II and ICMM, Friedrich-Alexander Universität Erlangen-Nürnberg, Egerlandstrasse 3, D-91058 Erlangen, Germany
| | - Yuri Gerelli
- Institute Laue Langevin, 6 rue Jules Horowitz, 38000 Grenoble, France
| | - Andrea Scotti
- Dipartimento di Fisica, Università di Parma, Parma, Italy
| | - Antonio Deriu
- Dipartimento di Fisica, Università di Parma, Parma, Italy
| | - Geraldine Carrot
- Laboratoire Léon Brillouin, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France
| | - Gaio Paradossi
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, 000133 Roma, Italy
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Mansour HM, Sohn M, Al-Ghananeem A, Deluca PP. Materials for pharmaceutical dosage forms: molecular pharmaceutics and controlled release drug delivery aspects. Int J Mol Sci 2010; 11:3298-322. [PMID: 20957095 PMCID: PMC2956096 DOI: 10.3390/ijms11093298] [Citation(s) in RCA: 119] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Revised: 08/30/2010] [Accepted: 09/03/2010] [Indexed: 12/16/2022] Open
Abstract
Controlled release delivery is available for many routes of administration and offers many advantages (as microparticles and nanoparticles) over immediate release delivery. These advantages include reduced dosing frequency, better therapeutic control, fewer side effects, and, consequently, these dosage forms are well accepted by patients. Advances in polymer material science, particle engineering design, manufacture, and nanotechnology have led the way to the introduction of several marketed controlled release products and several more are in pre-clinical and clinical development.
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Affiliation(s)
- Heidi M Mansour
- Division of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, KY 40536, USA; E-Mails: (M.S.); (A.A.-G.); (P.P.D)
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Tzvetkov G, Paradossi G, Tortora M, Fernandes P, Fery A, Graf-Zeiler B, Fink RH. Water-dispersible PVA-based dry microballoons with potential for biomedical applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2010. [DOI: 10.1016/j.msec.2009.12.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Tzvetkov G, Fernandes P, Wenzel S, Fery A, Paradossi G, Fink RH. Soft X-ray induced modifications of PVA-based microbubbles in aqueous environment: a microspectroscopy study. Phys Chem Chem Phys 2009; 11:1098-104. [DOI: 10.1039/b814946a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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