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Ma KY, Perera-Gonzalez M, Langlois NI, Alzubi OM, Guimond JD, Flask CA, Clark HA. pH-responsive i-motif-conjugated nanoparticles for MRI analysis. SENSORS & DIAGNOSTICS 2024; 3:623-630. [PMID: 38646186 PMCID: PMC11025034 DOI: 10.1039/d3sd00285c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 02/21/2024] [Indexed: 04/23/2024]
Abstract
Gadolinium (Gd)-based contrast agents (CAs) are widely used to enhance anatomical details in magnetic resonance imaging (MRI). Significant research has expanded the field of CAs into bioresponsive CAs by modulating the signal to image and monitor biochemical processes, such as pH. In this work, we introduce the modular, dynamic actuation mechanism of DNA-based nanostructures as a new way to modulate the MRI signal based on the rotational correlation time, τR. We combined a pH-responsive oligonucleotide (i-motif) and a clinical standard CA (Gd-DOTA) to develop a pH-responsive MRI CA. The i-motif folds into a quadruplex under acidic conditions and was incorporated onto gold nanoparticles (iM-GNP) to achieve increased relaxivity, r1, compared to the unbound i-motif. In vitro, iM-GNP resulted in a significant increase in r1 over a decreasing pH range (7.5-4.5) with a calculated pKa = 5.88 ± 0.01 and a 16.7% change per 0.1 pH unit. In comparison, a control CA with a non-responsive DNA strand (T33-GNP) did not show a significant change in r1 over the same pH range. The iM-GNP was further evaluated in 20% human serum and demonstrated a 28.14 ± 11.2% increase in signal from neutral pH to acidic pH. This approach paves a path for novel programmable, dynamic DNA-based complexes for τR-modulated bioresponsive MRI CAs.
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Affiliation(s)
- Kristine Y Ma
- School of Biological and Health Systems Engineering, Arizona State University Tempe AZ USA
- Dept. of Bioengineering, Northeastern University Boston MA USA
| | | | - Nicole I Langlois
- Dept. of Chemistry and Chemical Biology, Northeastern University Boston MA USA
| | - Owen M Alzubi
- School of Biological and Health Systems Engineering, Arizona State University Tempe AZ USA
| | - Joseph D Guimond
- School of Biological and Health Systems Engineering, Arizona State University Tempe AZ USA
| | - Chris A Flask
- Depts. of Radiology, Biomedical Engineering, and Pediatrics, Case Western Reserve University Cleveland OH USA
| | - Heather A Clark
- School of Biological and Health Systems Engineering, Arizona State University Tempe AZ USA
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2
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Ziemian S, Green C, Sourbron S, Jost G, Schütz G, Hines CD. Ex vivo gadoxetate relaxivities in rat liver tissue and blood at five magnetic field strengths from 1.41 to 7 T. NMR IN BIOMEDICINE 2021; 34:e4401. [PMID: 32851735 PMCID: PMC7757196 DOI: 10.1002/nbm.4401] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/11/2020] [Accepted: 08/13/2020] [Indexed: 06/11/2023]
Abstract
Quantitative mapping of gadoxetate uptake and excretion rates in liver cells has shown potential to significantly improve the management of chronic liver disease and liver cancer. Unfortunately, technical and clinical validation of the technique is currently hampered by the lack of data on gadoxetate relaxivity. The aim of this study was to fill this gap by measuring gadoxetate relaxivity in liver tissue, which approximates hepatocytes, in blood, urine and bile at magnetic field strengths of 1.41, 1.5, 3, 4.7 and 7 T. Measurements were performed ex vivo in 44 female Mrp2 knockout rats and 30 female wild-type rats who had received an intravenous bolus of either 10, 25 or 40 μmol/kg gadoxetate. T1 was measured at 37 ± 3°C on NMR instruments (1.41 and 3 T), small-animal MRI (4.7 and 7 T) and clinical MRI (1.5 and 3 T). Gadolinium concentration was measured with optical emission spectrometry or mass spectrometry. The impact on measurements of gadoxetate rate constants was determined by generalizing pharmacokinetic models to tissues with different relaxivities. Relaxivity values (L mmol-1 s-1 ) showed the expected dependency on tissue/biofluid type and field strength, ranging from 15.0 ± 0.9 (1.41) to 6.0 ± 0.3 (7) T in liver tissue, from 7.5 ± 0.2 (1.41) to 6.2 ± 0.3 (7) T in blood, from 5.6 ± 0.1 (1.41) to 4.5 ± 0.1 (7) T in urine and from 5.6 ± 0.4 (1.41) to 4.3 ± 0.6 (7) T in bile. Failing to correct for the relaxivity difference between liver tissue and blood overestimates intracellular uptake rates by a factor of 2.0 at 1.41 T, 1.8 at 1.5 T, 1.5 at 3 T and 1.2 at 4.7 T. The relaxivity values derived in this study can be used retrospectively and prospectively to remove a well-known bias in gadoxetate rate constants. This will promote the clinical translation of MR-based liver function assessment by enabling direct validation against reference methods and a more effective translation between in vitro findings, animal models and patient studies.
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Affiliation(s)
| | - Claudia Green
- MR & CT Contrast Media ResearchBayer AGBerlinGermany
| | - Steven Sourbron
- Department of Infection, Immunity and Cardiovascular DiseaseUniversity of SheffieldSheffieldUK
| | - Gregor Jost
- MR & CT Contrast Media ResearchBayer AGBerlinGermany
| | - Gunnar Schütz
- MR & CT Contrast Media ResearchBayer AGBerlinGermany
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3
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Phoungtawee P, Crespy D. Shining a new light on the structure of polyurea/polyurethane materials. Polym Chem 2021. [DOI: 10.1039/d1py00649e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polyurea and polyurethane are widely used in coatings, foams, and micro- and nanocapsules. Investigations of the polymers structure indicate that a significant amount of hydrolyzed isocyanate is incorporated in the macromolecular backbone.
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Affiliation(s)
- Piangtawan Phoungtawee
- Department of Materials Science and Engineering
- School of Molecular Science and Engineering
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
- Rayong 21210
- Thailand
| | - Daniel Crespy
- Department of Materials Science and Engineering
- School of Molecular Science and Engineering
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
- Rayong 21210
- Thailand
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4
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Kang C, Kim D. Nanoconfinement-mediated cancer theranostics. Arch Pharm Res 2020; 43:110-117. [PMID: 31989481 DOI: 10.1007/s12272-020-01217-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 01/20/2020] [Indexed: 10/25/2022]
Abstract
Despite various therapeutic or diagnostic developments, cancer is still one of the most lethal diseases due to insufficiently adequate treatments and the delay of the early stage of disease detection. An image-guided drug delivery system (IGDDS), as a real-time noninvasive imaging assessment of therapeutic response, has the strong potential to improve the diagnosis and treatment of cancer because its imaging property offers the quantification of nanomedicine at the intended disease sites, the possible assurance of adequate treatment and elimination of undesirable delay of early-stage diagnosis due to low resolution. One of potential modality that overcomes these challenges could be the nanoconfinement of gold (Au) nanoparticles within other nanoparticles called "Particle-in-Particle (PIP)", which is a strong candidate of cancer treatment because of its "theranostic (therapy + diagnostics)" advantages including imaging (e.g., CT) and therapeutic hyperthermia application. In this review, we will elaborate on the current application of theranostic by nanoconfinement. Then, we will narrow down the gold nanoparticle-mediated theranostic application and its nanoconfinement advantages. Finally, the future direction for maximum nanoconfinement mediated cancer therapy will be included.
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Affiliation(s)
- Changsun Kang
- Department of Pharmaceutical Sciences, Rangel College of Pharmacy, Texas A&M University, College Station, USA
| | - Dongin Kim
- Department of Pharmaceutical Sciences, Rangel College of Pharmacy, Texas A&M University, College Station, USA.
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5
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Jenjob R, Phakkeeree T, Crespy D. Core–shell particles for drug-delivery, bioimaging, sensing, and tissue engineering. Biomater Sci 2020; 8:2756-2770. [DOI: 10.1039/c9bm01872g] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Core–shell particles offer significant advantages in their use for bioimaging and biosensors.
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Affiliation(s)
- Ratchapol Jenjob
- Department of Materials Science and Engineering
- School of Molecular Science and Engineering
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
- Rayong 21210
- Thailand
| | - Treethip Phakkeeree
- Department of Materials Science and Engineering
- School of Molecular Science and Engineering
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
- Rayong 21210
- Thailand
| | - Daniel Crespy
- Department of Materials Science and Engineering
- School of Molecular Science and Engineering
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
- Rayong 21210
- Thailand
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6
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Thongchaivetcharat K, Jenjob R, Seidi F, Crespy D. Programming pH-responsive release of two payloads from dextran-based nanocapsules. Carbohydr Polym 2019; 217:217-223. [DOI: 10.1016/j.carbpol.2019.04.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 04/02/2019] [Accepted: 04/04/2019] [Indexed: 12/24/2022]
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7
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Emulsion Techniques for the Production of Pharmacological Nanoparticles. Macromol Biosci 2019; 19:e1900063. [DOI: 10.1002/mabi.201900063] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Revised: 04/10/2019] [Indexed: 12/13/2022]
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8
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Iyisan B, Landfester K. Polymeric Nanocarriers. BIOLOGICAL RESPONSES TO NANOSCALE PARTICLES 2019. [DOI: 10.1007/978-3-030-12461-8_3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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9
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Confined Polymers as Self-Avoiding Random Walks on Restricted Lattices. Polymers (Basel) 2018; 10:polym10121394. [PMID: 30961318 PMCID: PMC6401801 DOI: 10.3390/polym10121394] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2018] [Revised: 12/02/2018] [Accepted: 12/11/2018] [Indexed: 11/17/2022] Open
Abstract
Polymers in highly confined geometries can display complex morphologies including ordered phases. A basic component of a theoretical analysis of their phase behavior in confined geometries is the knowledge of the number of possible single-chain conformations compatible with the geometrical restrictions and the established crystalline morphology. While the statistical properties of unrestricted self-avoiding random walks (SAWs) both on and off-lattice are very well known, the same is not true for SAWs in confined geometries. The purpose of this contribution is (a) to enumerate the number of SAWs on the simple cubic (SC) and face-centered cubic (FCC) lattices under confinement for moderate SAW lengths, and (b) to obtain an approximate expression for their behavior as a function of chain length, type of lattice, and degree of confinement. This information is an essential requirement for the understanding and prediction of entropy-driven phase transitions of model polymer chains under confinement. In addition, a simple geometric argument is presented that explains, to first order, the dependence of the number of restricted SAWs on the type of SAW origin.
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10
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Iyisan B, Landfester K. Modular Approach for the Design of Smart Polymeric Nanocapsules. Macromol Rapid Commun 2018; 40:e1800577. [DOI: 10.1002/marc.201800577] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 11/14/2018] [Indexed: 12/23/2022]
Affiliation(s)
- Banu Iyisan
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
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11
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Seidi F, Jenjob R, Phakkeeree T, Crespy D. Saccharides, oligosaccharides, and polysaccharides nanoparticles for biomedical applications. J Control Release 2018; 284:188-212. [DOI: 10.1016/j.jconrel.2018.06.026] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 06/18/2018] [Accepted: 06/20/2018] [Indexed: 12/16/2022]
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12
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Schlegel I, Renz P, Simon J, Lieberwirth I, Pektor S, Bausbacher N, Miederer M, Mailänder V, Muñoz-Espí R, Crespy D, Landfester K. Highly Loaded Semipermeable Nanocapsules for Magnetic Resonance Imaging. Macromol Biosci 2018; 18:e1700387. [DOI: 10.1002/mabi.201700387] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Revised: 12/30/2017] [Indexed: 01/21/2023]
Affiliation(s)
- Isabel Schlegel
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Patricia Renz
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Johanna Simon
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Ingo Lieberwirth
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
| | - Stefanie Pektor
- Department of Nuclear Medicine; University Medical Center Mainz; Langenbeckstraße 1 55131 Mainz Germany
| | - Nicole Bausbacher
- Department of Nuclear Medicine; University Medical Center Mainz; Langenbeckstraße 1 55131 Mainz Germany
| | - Matthias Miederer
- Department of Nuclear Medicine; University Medical Center Mainz; Langenbeckstraße 1 55131 Mainz Germany
| | - Volker Mailänder
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
- Dermatology Clinic; University Medical Center Mainz; Langenbeckstraße 1 55131 Mainz Germany
| | - Rafael Muñoz-Espí
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
- Institute of Materials Science (ICMUV); Universitat de València; C/ Catedràtic José Beltrán 2 46980 Paterna València Spain
| | - Daniel Crespy
- Max Planck Institute for Polymer Research; Ackermannweg 10 55128 Mainz Germany
- Department of Materials Science and Engineering; School of Molecular Science and Engineering; Vidyasirimedhi Institute of Science and Technology (VISTEC); Rayong 21210 Thailand
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13
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Schlegel I, Muñoz-Espí R, Renz P, Lieberwirth I, Floudas G, Suzuki Y, Crespy D, Landfester K. Crystallinity Tunes Permeability of Polymer Nanocapsules. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00667] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Isabel Schlegel
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
| | - Rafael Muñoz-Espí
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
- Institute
of Materials Science (ICMUV), Universitat de València, C/Catedràtic
José Beltrán 2, Paterna, 46980 València, Spain
| | - Patricia Renz
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
| | - Ingo Lieberwirth
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
| | - George Floudas
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
- Department
of Physics, University of Ioannina, P.O. Box 1186, 451 10 Ioannina, Greece
| | - Yasuhito Suzuki
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
- Chemical
and Biological Engineering Department, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Daniel Crespy
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
- Department
of Materials Science and Engineering, School of Molecular Science
and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong 21210, Thailand
| | - Katharina Landfester
- Max Planck Institute
for Polymer Research, Ackermannweg
10, 55128 Mainz, Germany
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14
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Rigaux G, Gheran CV, Callewaert M, Cadiou C, Voicu SN, Dinischiotu A, Andry MC, Vander Elst L, Laurent S, Muller RN, Berquand A, Molinari M, Huclier-Markai S, Chuburu F. Characterization of Gd loaded chitosan-TPP nanohydrogels by a multi-technique approach combining dynamic light scattering (DLS), asymetrical flow-field-flow-fractionation (AF4) and atomic force microscopy (AFM) and design of positive contrast agents for molecular resonance imaging (MRI). NANOTECHNOLOGY 2017; 28:055705. [PMID: 28029111 DOI: 10.1088/1361-6528/aa5188] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Chitosan CS-tripolyphosphate TPP/hyaluronic acid HA nanohydrogels loaded with gadolinium chelates (GdDOTA ⊂ CS-TPP/HA NGs) synthesized by ionic gelation were designed for lymph node (LN) MRI. In order to be efficiently drained to LNs, nanogels (NGs) needed to exhibit a diameter ϕ < 100 nm. For that, formulation parameters were tuned, using (i) CS of two different molecular weights (51 and 37 kDa) and (ii) variable CS/TPP ratio (2 < CS/TPP < 8). Characterization of NG size distribution by dynamic light scattering (DLS) and asymetrical flow-field-flow-fractionation (AF4) showed discrepancies since DLS diameters were consistently above 200 nm while AF4 showed individual nano-objects with ϕ < 100 nm. Such a difference could be correlated to the presence of aggregates inherent to ionic gelation. This point was clarified by atomic force microscopy (AFM) in liquid mode which highlighted the main presence of individual nano-objects in nanosuspensions. Thus, combination of DLS, AF4 and AFM provided a more precise characterization of GdDOTA ⊂ CS-TPP/HA nanohydrogels which, in turn, allowed to select formulations leading to NGs of suitable mean sizes showing good MRI efficiency and negligible toxicity.
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Affiliation(s)
- G Rigaux
- Institut de Chimie Moléculaire de Reims, CNRS UMR 7312, Université de Reims Champagne-Ardenne URCA, F-51685 Reims Cedex 2, France
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15
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Pan Y, Yang J, Fang Y, Zheng J, Song R, Yi C. One-pot synthesis of gadolinium-doped carbon quantum dots for high-performance multimodal bioimaging. J Mater Chem B 2017; 5:92-101. [DOI: 10.1039/c6tb02115h] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A high-performance fluorescence (FL)/magnetic resonance (MR) imaging probe is synthesized by doping Gd3+ into carbon quantum dots via a one-pot pyrolysis process, and its dual-modality applications are demonstrated by the use of HeLa cells and mice as models.
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Affiliation(s)
- Yi Pan
- Key Laboratory of Sensing Technology and Biomedical Instruments (Guangdong Province)
- School of Engineering
- Sun Yat-Sen University
- Guangzhou
- China
| | - Jun Yang
- Key Laboratory of Sensing Technology and Biomedical Instruments (Guangdong Province)
- School of Engineering
- Sun Yat-Sen University
- Guangzhou
- China
| | - Yaning Fang
- Key Laboratory of Sensing Technology and Biomedical Instruments (Guangdong Province)
- School of Engineering
- Sun Yat-Sen University
- Guangzhou
- China
| | | | - Rong Song
- Key Laboratory of Sensing Technology and Biomedical Instruments (Guangdong Province)
- School of Engineering
- Sun Yat-Sen University
- Guangzhou
- China
| | - Changqing Yi
- Key Laboratory of Sensing Technology and Biomedical Instruments (Guangdong Province)
- School of Engineering
- Sun Yat-Sen University
- Guangzhou
- China
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16
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He W, Graf R, Vieth S, Ziener U, Landfester K, Crespy D. The Cushion Method: A New Technique for the Recovery of Hydrophilic Nanocarriers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:13669-13674. [PMID: 27958731 DOI: 10.1021/acs.langmuir.6b02880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Microencapsulation of hydrophilic therapeutic agents such as proteins or nucleotides into a nanocarrier is frequently accomplished in inverse (water-in-oil) emulsions. However, the redispersion of the nanocarriers in aqueous media often involves a complicated purification process, and the redispersion usually requires additional surfactants for its colloidal stability, which is not favored for biological applications. We propose a simple, fast, and mild method to recover hydrophilic nanocarriers prepared in inverse emulsions by temporary coating of the nanocarriers with biocompatible small molecules, so that the final aqueous dispersion of the nanocarriers can be dispersed with high recovery rate, minimal aggregation, and no additional surfactants. Such a method is termed the "cushion method" and was adopted in the preparation of chitosan nanocarriers. The nanocarriers recovered with the cushion method release encapsulated peptides in a pH-responsive manner and do not require surfactants for colloidal stabilization.
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Affiliation(s)
- Wei He
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Robert Graf
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Stefan Vieth
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ulrich Ziener
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Katharina Landfester
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Daniel Crespy
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC) , Rayong 21210, Thailand
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17
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Torino E, Aruta R, Sibillano T, Giannini C, Netti PA. Synthesis of semicrystalline nanocapsular structures obtained by Thermally Induced Phase Separation in nanoconfinement. Sci Rep 2016; 6:32727. [PMID: 27604818 PMCID: PMC5015022 DOI: 10.1038/srep32727] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 08/08/2016] [Indexed: 12/18/2022] Open
Abstract
Phase separation of a polymer solution exhibits a peculiar behavior when induced in a nanoconfinement. The energetic constraints introduce additional interactions between the polymer segments that reduce the number of available configurations. In our work, this effect is exploited in a one-step strategy called nanoconfined-Thermally Induced Phase Separation (nc-TIPS) to promote the crystallization of polymer chains into nanocapsular structures of controlled size and shell thickness. This is accomplished by performing a quench step of a low-concentrated PLLA-dioxane-water solution included in emulsions of mean droplet size <500 nm acting as nanodomains. The control of nanoconfinement conditions enables not only the production of nanocapsules with a minimum mean particle diameter of 70 nm but also the tunability of shell thickness and its crystallinity degree. The specific properties of the developed nanocapsular architectures have important implications on release mechanism and loading capability of hydrophilic and lipophilic payload compounds.
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Affiliation(s)
- Enza Torino
- Center for Advanced Biomaterials for Health Care @CRIB - Istituto Italiano di Tecnologia (IIT), Largo Barsanti e Matteucci n. 53, 80125, Napoli, Italy
- University of Naples Federico II, Interdisciplinary Research Center of Biomaterials, CRIB P.le Tecchio 80, 80125, Naples, Italy
| | - Rosaria Aruta
- Center for Advanced Biomaterials for Health Care @CRIB - Istituto Italiano di Tecnologia (IIT), Largo Barsanti e Matteucci n. 53, 80125, Napoli, Italy
- University of Naples Federico II, Department of Chemical, Materials and Industrial Production Engineering, P.le Tecchio 80, 80125, Naples, Italy
| | - Teresa Sibillano
- CNR - IC Istituto di Cristallografia, via Amendola 122/O, 70126 Bari-Italia
| | - Cinzia Giannini
- CNR - IC Istituto di Cristallografia, via Amendola 122/O, 70126 Bari-Italia
| | - Paolo A. Netti
- Center for Advanced Biomaterials for Health Care @CRIB - Istituto Italiano di Tecnologia (IIT), Largo Barsanti e Matteucci n. 53, 80125, Napoli, Italy
- University of Naples Federico II, Interdisciplinary Research Center of Biomaterials, CRIB P.le Tecchio 80, 80125, Naples, Italy
- University of Naples Federico II, Department of Chemical, Materials and Industrial Production Engineering, P.le Tecchio 80, 80125, Naples, Italy
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18
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Stabilization of Inverse Miniemulsions by Silyl-Protected Homopolymers. Polymers (Basel) 2016; 8:polym8080303. [PMID: 30974578 PMCID: PMC6431836 DOI: 10.3390/polym8080303] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 08/01/2016] [Accepted: 08/02/2016] [Indexed: 12/24/2022] Open
Abstract
Inverse (water-in-oil) miniemulsions are an important method to encapsulate hydrophilic payloads such as oligonucleotides or peptides. However, the stabilization of inverse miniemulsions usually requires block copolymers that are difficult to synthesize and/or cannot be easily removed after transfer from a hydrophobic continuous phase to an aqueous continuous phase. We describe here a new strategy for the synthesis of a surfactant for inverse miniemulsions by radical addition⁻fragmentation chain transfer (RAFT) polymerization, which consists in a homopolymer with triisopropylsilyl protecting groups. The protecting groups ensure the efficient stabilization of the inverse (water-in-oil, w/o) miniemulsions. Nanocapsules can be formed and the protecting group can be subsequently cleaved for the re-dispersion of nanocapsules in an aqueous medium with a minimal amount of additional surfactant.
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