201
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McLaughlin CK, Duan D, Ganesh AN, Torosyan H, Shoichet BK, Shoichet MS. Stable Colloidal Drug Aggregates Catch and Release Active Enzymes. ACS Chem Biol 2016; 11:992-1000. [PMID: 26741163 DOI: 10.1021/acschembio.5b00806] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Small molecule aggregates are considered nuisance compounds in drug discovery, but their unusual properties as colloids could be exploited to form stable vehicles to preserve protein activity. We investigated the coaggregation of seven molecules chosen because they had been previously intensely studied as colloidal aggregators, coformulating them with bis-azo dyes. The coformulation reduced colloid sizes to <100 nm and improved uniformity of the particle size distribution. The new colloid formulations are more stable than previous aggregator particles. Specifically, coaggregation of Congo Red with sorafenib, tetraiodophenolphthalein (TIPT), or vemurafenib produced particles that are stable in solutions of high ionic strength and high protein concentrations. Like traditional, single compound colloidal aggregates, the stabilized colloids adsorbed and inhibited enzymes like β-lactamase, malate dehydrogenase, and trypsin. Unlike traditional aggregates, the coformulated colloid-protein particles could be centrifuged and resuspended multiple times, and from resuspended particles, active trypsin could be released up to 72 h after adsorption. Unexpectedly, the stable colloidal formulations can sequester, stabilize, and isolate enzymes by spin-down, resuspension, and release.
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Affiliation(s)
- Christopher K. McLaughlin
- Department
of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario, Canada M5S 3E5
- Institute
of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario, Canada M5S 3G9
| | - Da Duan
- Department
of Pharmaceutical Chemistry, University of California, San Francisco, 1700 Fourth Street, San Francisco, California 94158-2550, United States
| | - Ahil N. Ganesh
- Department
of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario, Canada M5S 3E5
- Institute
of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario, Canada M5S 3G9
| | - Hayarpi Torosyan
- Department
of Pharmaceutical Chemistry, University of California, San Francisco, 1700 Fourth Street, San Francisco, California 94158-2550, United States
| | - Brian K. Shoichet
- Department
of Pharmaceutical Chemistry, University of California, San Francisco, 1700 Fourth Street, San Francisco, California 94158-2550, United States
| | - Molly S. Shoichet
- Department
of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario, Canada M5S 3E5
- Institute
of Biomaterials and Biomedical Engineering, University of Toronto, 164 College Street, Toronto, Ontario, Canada M5S 3G9
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202
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Giardiello M, Hatton FL, Slater RA, Chambon P, North J, Peacock AK, He T, McDonald TO, Owen A, Rannard SP. Stable, polymer-directed and SPION-nucleated magnetic amphiphilic block copolymer nanoprecipitates with readily reversible assembly in magnetic fields. NANOSCALE 2016; 8:7224-7231. [PMID: 26973155 DOI: 10.1039/c6nr00788k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The formation of inorganic-organic magnetic nanocomposites using reactive chemistry often leads to a loss of super-paramagnetisim when conducted in the presence of iron oxide nanoparticles. We present here a low energy and chemically-mild process of co-nanoprecipitation using SPIONs and homopolymers or amphiphilic block copolymers, of varying architecture and hydrophilic/hydrophobic balance, which efficiently generates near monodisperse SPION-containing polymer nanoparticles with complete retention of magnetism, and highly reversible aggregation and redispersion behaviour. When linear and branched block copolymers with inherent water-solubility are used, a SPION-directed nanoprecipitation mechanism appears to dominate the nanoparticle formation presenting new opportunities for tailoring and scaling highly functional systems for a range of applications.
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Affiliation(s)
- Marco Giardiello
- Department of Chemistry, University of Liverpool, Crown Street, L697ZD, UK.
| | - Fiona L Hatton
- Department of Chemistry, University of Liverpool, Crown Street, L697ZD, UK.
| | - Rebecca A Slater
- Department of Chemistry, University of Liverpool, Crown Street, L697ZD, UK.
| | - Pierre Chambon
- Department of Chemistry, University of Liverpool, Crown Street, L697ZD, UK.
| | - Jocelyn North
- Department of Chemistry, University of Liverpool, Crown Street, L697ZD, UK.
| | - Anita K Peacock
- Department of Chemistry, University of Liverpool, Crown Street, L697ZD, UK.
| | - Tao He
- Institute of Chemical and Engineering Sciences Agency for Science, Technology and Research (A*STAR), 1, Pesek Road, Jurong Island, 627833, Singapore
| | - Tom O McDonald
- Department of Chemistry, University of Liverpool, Crown Street, L697ZD, UK.
| | - Andrew Owen
- Department of Molecular and Clinical Pharmacology, University of Liverpool, Block H, 70 Pembroke Place, Liverpool L69 3GF, UK
| | - Steve P Rannard
- Department of Chemistry, University of Liverpool, Crown Street, L697ZD, UK.
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203
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Reisch A, Klymchenko AS. Fluorescent Polymer Nanoparticles Based on Dyes: Seeking Brighter Tools for Bioimaging. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:1968-92. [PMID: 26901678 PMCID: PMC5405874 DOI: 10.1002/smll.201503396] [Citation(s) in RCA: 364] [Impact Index Per Article: 45.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Revised: 12/13/2015] [Indexed: 05/13/2023]
Abstract
Speed, resolution and sensitivity of today's fluorescence bioimaging can be drastically improved by fluorescent nanoparticles (NPs) that are many-fold brighter than organic dyes and fluorescent proteins. While the field is currently dominated by inorganic NPs, notably quantum dots (QDs), fluorescent polymer NPs encapsulating large quantities of dyes (dye-loaded NPs) have emerged recently as an attractive alternative. These new nanomaterials, inspired from the fields of polymeric drug delivery vehicles and advanced fluorophores, can combine superior brightness with biodegradability and low toxicity. Here, we describe the strategies for synthesis of dye-loaded polymer NPs by emulsion polymerization and assembly of pre-formed polymers. Superior brightness requires strong dye loading without aggregation-caused quenching (ACQ). Only recently several strategies of dye design were proposed to overcome ACQ in polymer NPs: aggregation induced emission (AIE), dye modification with bulky side groups and use of bulky hydrophobic counterions. The resulting NPs now surpass the brightness of QDs by ≈10-fold for a comparable size, and have started reaching the level of the brightest conjugated polymer NPs. Other properties, notably photostability, color, blinking, as well as particle size and surface chemistry are also systematically analyzed. Finally, major and emerging applications of dye-loaded NPs for in vitro and in vivo imaging are reviewed.
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Affiliation(s)
- Andreas Reisch
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 74, Route du Rhin, 67401 ILLKIRCH Cedex, France
| | - Andrey S. Klymchenko
- Laboratoire de Biophotonique et Pharmacologie, UMR 7213 CNRS, Université de Strasbourg, Faculté de Pharmacie, 74, Route du Rhin, 67401 ILLKIRCH Cedex, France
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204
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Fabrication of multipotent poly-para-xylylene particles in controlled nanoscopic dimensions. Colloids Surf B Biointerfaces 2016; 139:259-68. [DOI: 10.1016/j.colsurfb.2015.12.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Revised: 12/06/2015] [Accepted: 12/14/2015] [Indexed: 12/15/2022]
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205
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Salvage JP, Smith T, Lu T, Sanghera A, Standen G, Tang Y, Lewis AL. Synthesis, characterisation, and in vitro cellular uptake kinetics of nanoprecipitated poly(2-methacryloyloxyethyl phosphorylcholine)-b-poly(2-(diisopropylamino)ethyl methacrylate) (MPC-DPA) polymeric nanoparticle micelles for nanomedicine applications. APPLIED NANOSCIENCE 2016. [DOI: 10.1007/s13204-016-0520-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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206
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Chiu SJ, Lin CY, Chou HC, Hu TM. Silica Ouzo Effect: Amphiphilic Drugs Facilitate Nanoprecipitation of Polycondensed Mercaptosilanes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:211-220. [PMID: 26673354 DOI: 10.1021/acs.langmuir.5b04048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Amphiphilic drugs are therapeutic agents whose molecular structures contain both hydrophobic and hydrophilic portions. Here we report a systematic study on how amphiphilic drugs can assist in silica nanoprecipitation. 3-Mercaptopropyltrimethoxysilane (MPTMS) was used as the sole silica material and 12 amphiphilic drugs spanning a wide spectrum of therapeutic categories were included. MPTMS polycondensation was conducted in a DMSO-based organic phase. After a sufficient time, particle formation was induced by injecting a small amount of the organic phase into a water solution containing various amphiphiles. The results show that all amphiphilic drugs studied exerted concentration-dependent facilitating effect on nanoparticle formation. Under certain preparation conditions, the particle solution showed physical stability over a long period and the formed particles could be as small as 100 nm. By systematically varying drug concentrations and injection volumes, the ability of each amphiphile to promote nanoprecipitation can be quantified and compared, based on two novel indices: the area under the critical volume-concentration curve (AUC) and the critical stabilization concentration (CSC). We demonstrate that both ability indices significantly correlated with the drug's log P and critical micelle concentrations (CMC). Furthermore, we have optimized the aging and particle purification condition and extensively characterized our system through comprehensive TEM and zeta-potential measurements, as well as determinations for drug entrapment and release. In conclusion, we have established a quantitative structure-activity relationship for amphiphilic small-molecular drugs in their ability to interact with poly(mercaptopropyl)silsesquioxane species and form nanoparticles via solvent shifting. We speculate that both hydrophobic and electrostatic interactions play important roles in the formation and stabilization of nanoparticles.
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Affiliation(s)
- Shih-Jiuan Chiu
- College of Pharmacy, Taipei Medical University , Taipei 11031, Taiwan, ROC
| | - Chien-Yu Lin
- College of Pharmacy, Taipei Medical University , Taipei 11031, Taiwan, ROC
- School of Pharmacy, National Defense Medical Center , Taipei 11490, Taiwan, ROC
| | - Hung-Chang Chou
- School of Pharmacy, National Defense Medical Center , Taipei 11490, Taiwan, ROC
| | - Teh-Min Hu
- School of Pharmacy, National Defense Medical Center , Taipei 11490, Taiwan, ROC
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207
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Jiang M, Han X, Guo W, Li W, Chen J, Ren G, Sun B, Wang Y, He Z. Star-shape paclitaxel prodrug self-assembled nanomedicine: combining high drug loading and enhanced cytotoxicity. RSC Adv 2016. [DOI: 10.1039/c6ra23169a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Star-shape paclitaxel prodrugs self-assembled nanoparticles combining high drug loading and enhanced cytotoxicity.
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Affiliation(s)
- Mengjuan Jiang
- Department of Biopharmaceutics
- School of Pharmacy
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Xiangfei Han
- Department of Biopharmaceutics
- School of Pharmacy
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Weiling Guo
- Department of Biopharmaceutics
- School of Pharmacy
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Wei Li
- Key Laboratory of Structure-Based Drug Design and Discovery
- Ministry of Education
- Shenyang Pharmaceutical University
- China
| | - Jinling Chen
- Key Laboratory of Structure-Based Drug Design and Discovery
- Ministry of Education
- Shenyang Pharmaceutical University
- China
| | - Guolian Ren
- School of Pharmacy
- Shanxi Medical University
- China
| | - Bingjun Sun
- Department of Biopharmaceutics
- School of Pharmacy
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Yongjun Wang
- Department of Biopharmaceutics
- School of Pharmacy
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Zhonggui He
- Department of Biopharmaceutics
- School of Pharmacy
- Shenyang Pharmaceutical University
- Shenyang
- China
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208
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Hatton FL, Chambon P, Savage AC, Rannard SP. Role of highly branched, high molecular weight polymer structures in directing uniform polymer particle formation during nanoprecipitation. Chem Commun (Camb) 2016; 52:3915-8. [PMID: 26871974 DOI: 10.1039/c6cc00611f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The presence of highly branched polymers with >100 conjoined primary chains is shown to induce a novel rapid nucleation and growth mechanism within polymer nanoprecipitation yielding functional, uniform nanoparticles without stabilisers, filtration or rapid mixing techniques.
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209
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Ekkelenkamp AE, Jansman MM, Roelofs K, Engbersen JF, Paulusse JM. Surfactant-free preparation of highly stable zwitterionic poly(amido amine) nanogels with minimal cytotoxicity. Acta Biomater 2016; 30:126-134. [PMID: 26518103 DOI: 10.1016/j.actbio.2015.10.037] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 10/19/2015] [Accepted: 10/23/2015] [Indexed: 01/14/2023]
Abstract
Narrowly dispersed zwitterionic poly(amido amine) (PAA) nanogels with a diameter of approximately 100nm were prepared by a high-yielding and surfactant-free, inverse nanoprecipitation of PAA polymers. The resulting, negatively charged, nanogels (PAA-NG1) were functionalized with N,N-dimethylethylenediamine via EDC/NHS coupling chemistry. This resulted in nanogels with a positive surface charge (PAA-NG2). Both types of nanogels were fluorescently labelled via isothiocyanate coupling. PAA-NG1 displays high colloidal stability both in PBS and Fetal Bovine Serum solution. Moreover, both nanogels exhibit a distinct zwitterionic swelling profile in response to pH changes. Cellular uptake of FITC-labelled nanogels with RAW 264.7, PC-3 and COS-7 cells was evaluated by fluorescence microscopy. These studies showed that nanogel surface charge greatly influences nanogel-cell interactions. The PAA polymer and PAA-NG1 showed minimal cell toxicity as was evaluated by MTT assays. The findings reported here demonstrate that PAA nanogels possess interesting properties for future studies in both drug delivery and imaging. STATEMENT OF SIGNIFICANCE The use of polymeric nanoparticles in biomedical applications such as drug delivery and imaging, shows great potential for medical applications. However, these nanoparticles are often not stable in biological environments. Zwitterionic polymers have shown excellent biocompatibility, but these materials are not easily degradable in biological environments. With the aim of developing a nanoparticle for drug delivery and imaging we synthesized a biomimetic and readily biodegradable zwitterionic polymer, which was incorporated into nanogels. These nanogels showed excellent stability in the presence of serum and minimal cytotoxicity, which was tested in three cell lines. Because of their negative surface charge and excellent serum stability, these nanogels are therefore promising carriers for drug delivery and molecular imaging.
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210
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Claudet C, In M, Massiera G. Method to disperse lipids as aggregates in oil for bilayers production. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2016; 39:9. [PMID: 26830758 DOI: 10.1140/epje/i2016-16009-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Accepted: 11/10/2015] [Indexed: 06/05/2023]
Abstract
Several techniques to assemble artificial lipid bilayers involve the zipping of monolayers. Their efficiency is determined by the renewal of the saturated monolayers to be zipped and this proceeds by adsorption of lipids dispersed in oil as aggregates. The size of these lipids aggregates is a key parameter to ensure both the stability of the suspension and a fast release of lipids at the interface. We propose a new method inspired from the solvent-shifting nucleation process allowing to control and tune the lipid aggregates size and that improves the production of artificial membranes. It is simpler and faster than current methods starting from a dry lipid film, which are highly sensitive to environmental conditions. This method opens the route to bilayer production processes with new potentialities in membrane composition.
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Affiliation(s)
- Cyrille Claudet
- Laboratoire Charles Coulomb, UMR5221 CNRS-Université de Montpellier, 34095, Montpellier, France
| | - Martin In
- Laboratoire Charles Coulomb, UMR5221 CNRS-Université de Montpellier, 34095, Montpellier, France
| | - Gladys Massiera
- Laboratoire Charles Coulomb, UMR5221 CNRS-Université de Montpellier, 34095, Montpellier, France.
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211
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Kundu S, Abdullah MF, Das A, Basu A, Halder A, Das M, Samanta A, Mukherjee A. Antifungal ouzo nanoparticles from guar gum propionate. RSC Adv 2016. [DOI: 10.1039/c6ra19658f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Synthesis of high DS guar gum propionate esters and the formation of self-assembly nanoparticles for fungus contact killing.
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Affiliation(s)
- Sonia Kundu
- Division of Pharmaceutical and Fine Chemical Technology
- Department of Chemical Technology
- University of Calcutta
- Kolkata
- India
| | - Md. Farooque Abdullah
- Division of Pharmaceutical and Fine Chemical Technology
- Department of Chemical Technology
- University of Calcutta
- Kolkata
- India
| | - Aatrayee Das
- Division of Pharmaceutical and Fine Chemical Technology
- Department of Chemical Technology
- University of Calcutta
- Kolkata
- India
| | - Aalok Basu
- Division of Pharmaceutical and Fine Chemical Technology
- Department of Chemical Technology
- University of Calcutta
- Kolkata
- India
| | - Asim Halder
- Division of Pharmaceutical and Fine Chemical Technology
- Department of Chemical Technology
- University of Calcutta
- Kolkata
- India
| | - Mousumi Das
- Division of Microbiology
- Department of Pharmaceutical Technology
- Jadavpur University
- Kolkata
- India
| | - Amalesh Samanta
- Division of Microbiology
- Department of Pharmaceutical Technology
- Jadavpur University
- Kolkata
- India
| | - Arup Mukherjee
- Division of Pharmaceutical and Fine Chemical Technology
- Department of Chemical Technology
- University of Calcutta
- Kolkata
- India
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212
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Pedro AS, Villa SD, Caliceti P, Melo SAVD, Albuquerque EC, Bertucco A, Salmaso S. Curcumin-loaded solid lipid particles by PGSS technology. J Supercrit Fluids 2016. [DOI: 10.1016/j.supflu.2015.07.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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213
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Ianiski FR, Laporta LV, Rubim AM, Luchese C. Validation of high performance liquid chromatography method for determination of meloxicam loaded PEGylated nanocapsules. BRAZ J PHARM SCI 2015. [DOI: 10.1590/s1984-82502015000400008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
abstract A method to ensure that an analytical method will produce reliable and interpretable information about the sample must first be validated, making sure that the results can be trusted and traced. In this study, we propose to validate an analytical high performance liquid chromatography (HPLC) method for the quantitation of meloxicam loaded PEGylated nanocapsules(M-PEGNC). We performed a validation study, evaluated parameters including specificity, linearity, quantification limit, detection limit, accuracy, precision and robustness. PEGylated nanocapsules were prepared by interfacial deposition of preformed polymer, and the particle size, polydispersity index, zeta potential, pH value and encapsulation efficiency were characterized. The proposed HPLC method provides selective, linear results in the range of 1.0-40.0 μg/mL; quantification and detection limits were 1.78 μg/mL and 0.59 μg/mL, respectively; relative standard deviation for repeatability was 1.35% and intermediate precision was 0.41% and 0.61% for analyst 1 and analyst 2, respectively; accuracy between 99.23 and 101.79%; robustness between 97.13 and 98.45% for the quantification of M-PEGNC. Mean particle diameters were 261 ± 13 nm and 249 ± 20 nm, polydispersity index was 0.15 ± 0.07 and 0.17 ± 0.06, pH values were 5.0 ± 0.2 and 5.2 ± 0.1, and zeta-potential values were -37.9 ± 3.2 mV e -31.8 ± 2.8 mV for M-PEGNC and placebo(B-PEGNC), respectively. In conclusion, the proposed analytical method is suitable for the quality control of M-PEGNC. Moreover, suspensions showed monomodal size distributions and low polydispersity index indicating high homogeneity of formulations with narrow size distributions, and appropriate pH and zeta potential. The extraction process was efficient for release of meloxicam from nanostructured systems.
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214
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Lu Z, Xu H, Zeng H, Zhang X. Solvent Effects on the Formation of Surface Nanodroplets by Solvent Exchange. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:12120-5. [PMID: 26488386 DOI: 10.1021/acs.langmuir.5b03303] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Solvent exchange is a simple process to form oil nanodroplets at solid-liquid interfaces with well-defined location and morphology. In this process, a good solvent of the oil is displaced by a poor solvent, leading to the nucleation and growth of oil droplets from a transient oversaturation at the mixing front. Our recent work has shown that the final volume of the droplets is related to the flow conditions. In this work, we investigate the effects of the type and the composition of solvents on the droplet formation under the same flow conditions. Water nanodroplets were produced by ethanol/cyclohexane (solution A) and cyclohexane (solution B) on a hydrophilic substrate. We found that the droplet size increases first and then decreases with an increase of the initial ethanol concentration in solution A. This is attributed to the phase separation of ethanol-cyclohexane-water; in particular, the composition of solution A on the phase boundary above the Ouzo region. The same reason also contributes to the lower efficiency in droplet formation for a longer alkane. The important implication from this work is that the maximal droplet volume is limited by the phase separation of the solvents used in the solvent exchange.
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Affiliation(s)
- Ziyang Lu
- Soft Matter & Interfaces Group, School of Civil, Environmental and Chemical Engineering, RMIT University , Melbourne, Victoria 3001, Australia
| | - Haolan Xu
- Ian Wark Research Institute, University of South Australia , Mawson Lakes, South Australia 5095, Australia
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, Alberta T6G 2 V4, Canada
| | - Xuehua Zhang
- Soft Matter & Interfaces Group, School of Civil, Environmental and Chemical Engineering, RMIT University , Melbourne, Victoria 3001, Australia
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215
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Leung MHM, Harada T, Dai S, Kee TW. Nanoprecipitation and Spectroscopic Characterization of Curcumin-Encapsulated Polyester Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:11419-11427. [PMID: 26439894 DOI: 10.1021/acs.langmuir.5b02773] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Curcumin-encapsulated polyester nanoparticles (Cur-polyester NPs) of approximately 100 nm diameter with a negatively charged surface were prepared using a one-step nanoprecipitation method. The Cur-polyester NPs were prepared using polylactic acid, poly(D,L-lactic-co-glycolic acid) and poly(ϵ-caprolactone) without any emulsifier or surfactant. The encapsulation of curcumin in these polyester NPs greatly suppresses curcumin degradation in the aqueous environment due to its segregation from water. In addition, the fluorescence of curcumin in polyester NPs has a quantum yield of 4 to 5%, which is higher than that of curcumin in micellar systems and comparable to those in organic solvents, further supporting the idea that the polyester NPs are capable of excluding water from curcumin. Furthermore, the results from femtosecond fluorescence upconversion spectroscopy reveal that there is a decrease in the signal amplitude corresponding to solvent reorganization of excited state curcumin in the polyester NPs compared with curcumin in micellar systems. The Cur-polyester NPs also show a lack of deuterium isotope effect in the fluorescence lifetime. These results indicate that the interaction between curcumin and water in the polyester NPs is significantly weaker than that in micelles. Therefore, the aqueous stability of curcumin is greatly improved due to highly effective segregation from water. The overall outcome suggests that the polyester NPs prepared using the method reported herein are an attractive system for encapsulating and stabilizing curcumin in the aqueous environment.
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Affiliation(s)
- Mandy H M Leung
- Department of Chemistry and ‡School of Chemical Engineering, The University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Takaaki Harada
- Department of Chemistry and ‡School of Chemical Engineering, The University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Sheng Dai
- Department of Chemistry and ‡School of Chemical Engineering, The University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Tak W Kee
- Department of Chemistry and ‡School of Chemical Engineering, The University of Adelaide , Adelaide, South Australia 5005, Australia
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216
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Bao T, Yin W, Zheng X, Zhang X, Yu J, Dong X, Yong Y, Gao F, Yan L, Gu Z, Zhao Y. One-pot synthesis of PEGylated plasmonic MoO(3-x) hollow nanospheres for photoacoustic imaging guided chemo-photothermal combinational therapy of cancer. Biomaterials 2015; 76:11-24. [PMID: 26517561 DOI: 10.1016/j.biomaterials.2015.10.048] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Revised: 10/13/2015] [Accepted: 10/18/2015] [Indexed: 12/24/2022]
Abstract
Engineering design of plasmonic nanomaterials as on-demand theranostic nanoagents with imaging, drug carrier, and photothermal therapy (PTT) functions have profound impact on treatment of cancer. Here, a facile 'one-pot' template-free hydrothermal route was firstly developed for synthesis of plasmonic oxygen deficiency molybdenum oxide hollow nanospheres functionalized by poly(ethylene glycol) (PEG-MoO(3-x) HNSs). The as-prepared PEG-MoO(3-x) HNSs not only have good biocompatibility but also exhibit obvious localized surface plasmon resonance (LSPR) absorption in the near-infrared (NIR) region. Especially, due to its intrinsic mesoporous properties and effective photothermal conversion efficiency upon 808-nm NIR laser irradiation, the PEG-MoO(3-x) HNSs can be applied as a pH/NIR laser dual-responsive camptothecin (CPT) drug delivery nanoplatform for chemotherapy as well as PTT to cancer cells. A remarkably improved synergistic therapeutic effect to pancreatic (PANC-1) tumor-bearing mice was obtained compared to the result of chemotherapy or PTT alone. Apart from its application for drug delivery, the PEG-MoO(3-x) HNSs can also be employed as an effective contrast nanoagent for photoacoustic (PAT) imaging because of its high NIR absorption, making it promising as a theranostic nanoagent for PAT imaging-guided chemo-photothermal combinational cancer therapy in the nanomedicine field.
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Affiliation(s)
- Tao Bao
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China; Chengdu University of Technology, College of Materials and Chemistry & Chemical Engineering, Chengdu, 610059, China
| | - Wenyan Yin
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
| | - Xiaopeng Zheng
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiao Zhang
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Jie Yu
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Xinghua Dong
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Yuan Yong
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Fuping Gao
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Liang Yan
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhanjun Gu
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
| | - Yuliang Zhao
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China; National Center for Nanosciences and Technology of China, Beijing, 100190, China.
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217
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Rajeev A, Erapalapati V, Madhavan N, Basavaraj MG. Conversion of expanded polystyrene waste to nanoparticles via nanoprecipitation. J Appl Polym Sci 2015. [DOI: 10.1002/app.42904] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Ashna Rajeev
- Department of Chemical Engineering; Indian Institute of Technology Madras; Chennai 600036 India
| | | | - Nandita Madhavan
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
| | - Madivala G. Basavaraj
- Department of Chemical Engineering; Indian Institute of Technology Madras; Chennai 600036 India
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218
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An efficient system for intracellular delivery of beta-lactam antibiotics to overcome bacterial resistance. Sci Rep 2015; 5:13500. [PMID: 26311631 PMCID: PMC4550931 DOI: 10.1038/srep13500] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Accepted: 07/28/2015] [Indexed: 11/08/2022] Open
Abstract
The "Golden era" of antibiotics is definitely an old story and this is especially true for intracellular bacterial infections. The poor intracellular bioavailability of antibiotics reduces the efficency of many treatments and thereby promotes resistances. Therefore, the development of nanodevices coupled with antibiotics that are capable of targeting and releasing the drug into the infected-cells appears to be a promising solution to circumvent these complications. Here, we took advantage of two natural terpenes (farnesyl and geranyl) to design nanodevices for an efficient intracellular delivery of penicillin G. The covalent linkage between the terpene moieties and the antibiotic leads to formation of prodrugs that self-assemble to form nanoparticles with a high drug payload between 55-63%. Futhermore, the addition of an environmentally-sensitive bond between the antibiotic and the terpene led to an efficient antibacterial activity against the intracellular pathogen Staphylococcus aureus with reduced intracellular replication of about 99.9% compared to untreated infected cells. Using HPLC analysis, we demonstrated and quantified the intracellular release of PenG when this sensitive-bond (SB) was present on the prodrug, showing the success of this technology to deliver antibiotics directly into cells.
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219
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Influence of the nanoprecipitation conditions on the supramolecular structure of squalenoyled nanoparticles. Eur J Pharm Biopharm 2015. [PMID: 26210010 DOI: 10.1016/j.ejpb.2015.07.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Hydrophobic organic compounds dissolved in a polar solvent can self-assemble into nanoparticles (NPs) upon nanoprecipitation into water. In the present study, we have investigated the structure of squalenacetyl-adenosine (SQAc-Ad) nanoparticles which were previously found to exhibit impressive neuroprotective activity. When obtained by nanoprecipitation of a SQAc-Ad ethanolic solution into water, two different supramolecular organizations of SQAc-Ad NPs were evidenced, depending on the water-to-ethanol volume ratio. It has been shown that a fraction of the solvent remained associated with the NPs, despite prolonged evaporation under reduced pressure after nanoprecipitation, and that this residual solvent dramatically affected their structure. This study points to the importance of being in the "Ouzo" region to minimize the amount and effect of residual solvent and to control the structure of NPs.
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220
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Abstract
Nanodroplets on a solid surface (i.e., surface nanodroplets) have practical implications for high-throughput chemical and biological analysis, lubrications, laboratory-on-chip devices, and near-field imaging techniques. Oil nanodroplets can be produced on a solid-liquid interface in a simple step of solvent exchange in which a good solvent of oil is displaced by a poor solvent. In this work, we experimentally and theoretically investigate the formation of nanodroplets by the solvent exchange process under well-controlled flow conditions. We find significant effects from the flow rate and the flow geometry on the droplet size. We develop a theoretical framework to account for these effects. The main idea is that the droplet nuclei are exposed to an oil oversaturation pulse during the exchange process. The analysis shows that the volume of the nanodroplets increases with the Peclet number Pe of the flow as ∝ Pe(3/4), which is in good agreement with our experimental results. In addition, at fixed flow rate and thus fixed Peclet number, larger and less homogeneously distributed droplets formed at less-narrow channels, due to convection effects originating from the density difference between the two solutions of the solvent exchange. The understanding from this work provides valuable guidelines for producing surface nanodroplets with desired sizes by controlling the flow conditions.
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221
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Afonso D, Le Corre SS, Berchel M, Couthon-Gourvès H, Le Gall T, Montier T, Lehn P, Jaffrès PA. Synthetic Phospholipids for pDNA Delivery and Antibacterial Action. PHOSPHORUS SULFUR 2015. [DOI: 10.1080/10426507.2014.980410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Damien Afonso
- Université de Brest, UEB, CEMCA, UMR CNRS 6521, Brest, France
| | | | - Mathieu Berchel
- Université de Brest, UEB, CEMCA, UMR CNRS 6521, Brest, France
| | | | - Tony Le Gall
- Université de Brest, UEB, INSERM U1078, SFR 148 ScInBIoS, Faculté de Médecine Brest, France
| | - Tristan Montier
- Université de Brest, UEB, INSERM U1078, SFR 148 ScInBIoS, Faculté de Médecine Brest, France
- CHRU de Brest, Faculté de Médecine et des Sciences de la Santé, Brest, France
| | - Pierre Lehn
- Université de Brest, UEB, INSERM U1078, SFR 148 ScInBIoS, Faculté de Médecine Brest, France
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222
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Leone F, Cavalli R. Drug nanosuspensions: a ZIP tool between traditional and innovative pharmaceutical formulations. Expert Opin Drug Deliv 2015; 12:1607-25. [PMID: 25960000 DOI: 10.1517/17425247.2015.1043886] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
INTRODUCTION A nanosuspension or nanocrystal suspension is a versatile formulation combining conventional and innovative features. It comprises 100% pure drug nanoparticles with sizes in the nano-scale range, generally stabilized by surfactants or polymers. Nanosuspensions are usually obtained in liquid media with bottom-up and top-down methods or by their combination. They have been designed to enhance the solubility, the dissolution rate and the bioavailability of drugs via various administration routes. Due to their small sizes, nanosuspensions can be also considered a drug delivery nanotechnology for the preparation of nanomedicine products. AREAS COVERED This review focuses on the state of the art of the nanocrystal-based formulation. It describes theory characteristics, design parameters, preparation methods, stability issues, as well as specific in vivo applications. Innovative strategies proposed to obtain nanomedicine formulation using nanocrystals are also reported. EXPERT OPINION Many drug nanodelivery systems have been developed to increase the bioavailability of drugs and to decrease adverse side effects, but few can be industrially manufactured. Nanocrystals can close this gap by combining traditional and innovative drug formulations. Indeed, they can be used in many pharmaceutical dosage forms as such, or developed as new nano-scaled products. Engineered surface nanocrystals have recently been proposed as a dual strategy for stability enhancement and targeting delivery of nanocrystals.
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Affiliation(s)
- Federica Leone
- a 1 University of Torino, Department of Drug Science and Technology , Via Pietro Giuria 9, 10125, Torino, Italy.,b 2 Department of Applied Science and Technology, Politecnico di Torino , Corso Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Roberta Cavalli
- c 3 University of Torino, Department of Drug Science and Technology , Via Pietro Giuria 9, 10125, Torino, Italy +011 6707686 ;
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223
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Beck-Broichsitter M, Nicolas J, Couvreur P. Solvent selection causes remarkable shifts of the "Ouzo region" for poly(lactide-co-glycolide) nanoparticles prepared by nanoprecipitation. NANOSCALE 2015; 7:9215-9221. [PMID: 25924854 DOI: 10.1039/c5nr01695a] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Polymer nanoparticles (NPs) offer versatile novel biological features of interest for drug delivery applications. "Ouzo diagrams" allowed for a systematic manufacture of specified colloidal formulations by the widely used nanoprecipitation process. Surprisingly, despite the well-documented relevance of the applied organic solvent for nanoprecipitation, its effect on the actual status of the "Ouzo region" was so far not studied. Herein, investigations were undertaken to account for the potential impact of the solvent type on the "Ouzo diagrams" for poly(lactide-co-glycolide) (PLGA) and tetrahydrofuran (THF), 1,4-dioxane, acetone and dimethyl sulfoxide (DMSO). The "Ouzo region" shifted considerably to higher polymer fractions upon solvent change (rank order: THF < 1,4-dioxane < acetone < DMSO). Assuming a one-to-one transformation of detached PLGA-bearing solvent droplets (droplet diameter for THF: ∼800 nm, 1,4-dioxane: ∼700 nm, acetone: ∼500 nm and DMSO: ∼300 nm) into non-divisible polymer aggregates upon solvent displacement, facilitated to predict the size of NPs found within the "Ouzo region" (size range: 40-200 nm). In conclusion, application of "Ouzo diagrams" is a valuable tool for drug delivery research and will most-likely replace the "trial-and-error"-approach to identify the operating window for the production of stable colloidal formulations by the nanoprecipitation technique.
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Affiliation(s)
- Moritz Beck-Broichsitter
- Institut Galien Paris-Sud, CNRS UMR 8612, University of Paris-Sud, F-92196, Châtenay-Malabry Cedex, France.
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224
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Diou O, Greco S, Beltran T, Lairez D, Authelin JR, Bazile D. A method to Quantify the Affinity of Cabazitaxel for PLA-PEG Nanoparticles and Investigate the Influence of the Nano-Assembly Structure on the Drug/Particle Association. Pharm Res 2015; 32:3188-200. [DOI: 10.1007/s11095-015-1696-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Accepted: 04/09/2015] [Indexed: 11/30/2022]
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225
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Beck-Broichsitter M, Nicolas J, Couvreur P. Design attributes of long-circulating polymeric drug delivery vehicles. Eur J Pharm Biopharm 2015; 97:304-17. [PMID: 25857838 DOI: 10.1016/j.ejpb.2015.03.033] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Revised: 03/11/2015] [Accepted: 03/23/2015] [Indexed: 02/03/2023]
Abstract
Following systemic administration polymeric drug delivery vehicles allow for a controlled and targeted release of the encapsulated medication at the desired site of action. For an elevated and organ specific accumulation of their cargo, nanocarriers need to avoid opsonization, activation of the complement system and uptake by macrophages of the mononuclear phagocyte system. In this respect, camouflaged vehicles revealed a delayed elimination from systemic circulation and an improved target organ deposition. For instance, a steric shielding of the carrier surface by poly(ethylene glycol) substantially decreased interactions with the biological environment. However, recent studies disclosed possible deficits of this approach, where most notably, poly(ethylene glycol)-modified drug delivery vehicles caused significant immune responses. At present, identification of novel potential carrier coating strategies facilitating negligible immune reactions is an emerging field of interest in drug delivery research. Moreover, physical carrier properties including geometry and elasticity seem to be very promising design attributes to surpass numerous biological barriers, in order to improve the efficacy of the delivered medication.
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Affiliation(s)
- Moritz Beck-Broichsitter
- Institut Galien UMR CNRS 8612, Faculté de Pharmacie, Université Paris-Sud XI, Châtenay-Malabry, France
| | - Julien Nicolas
- Institut Galien UMR CNRS 8612, Faculté de Pharmacie, Université Paris-Sud XI, Châtenay-Malabry, France
| | - Patrick Couvreur
- Institut Galien UMR CNRS 8612, Faculté de Pharmacie, Université Paris-Sud XI, Châtenay-Malabry, France.
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226
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Tang C, Amin D, Messersmith PB, Anthony JE, Prud’homme RK. Polymer directed self-assembly of pH-responsive antioxidant nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:3612-20. [PMID: 25760226 PMCID: PMC4679371 DOI: 10.1021/acs.langmuir.5b00213] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have developed pH-responsive, multifunctional nanoparticles based on encapsulation of an antioxidant, tannic acid (TA), using flash nanoprecipitation, a polymer directed self-assembly method. Formation of insoluble coordination complexes of tannic acid and iron during mixing drives nanoparticle assembly. Tuning the core material to polymer ratio, the size of the nanoparticles can be readily tuned between 50 and 265 nm. The resulting nanoparticle is pH-responsive, i.e., stable at pH 7.4 and soluble under acidic conditions due to the nature of the coordination complex. Further, the coordination complex can be coprecipitated with other hydrophobic materials such as therapeutics or imaging agents. For example, coprecipitation with a hydrophobic fluorescent dye creates fluorescent nanoparticles. In vitro, the nanoparticles have low cytotoxicity and show antioxidant activity. Therefore, these particles may facilitate intracellular delivery of antioxidants.
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Affiliation(s)
- Christina Tang
- Department of Chemical and Biological Engineering Princeton University Princeton, NJ 08544, United States
| | - Devang Amin
- Biomedical Engineering Department Northwestern University 2145 Sheridan Rd, Evanston, IL 60208 United States
| | - Phillip B. Messersmith
- Biomedical Engineering Department Northwestern University 2145 Sheridan Rd, Evanston, IL 60208 United States
- Departments of Bioengineering and Materials Science and Engineering University of California, Berkeley 210 Hearst Mining Building, Berkeley, CA 94720 United States
| | - John E. Anthony
- Department of Chemistry University of Kentucky Lexington, KY 40506, United States
| | - Robert K. Prud’homme
- Department of Chemical and Biological Engineering Princeton University Princeton, NJ 08544, United States
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227
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Ford J, Chambon P, North J, Hatton FL, Giardiello M, Owen A, Rannard SP. Multiple and Co-Nanoprecipitation Studies of Branched Hydrophobic Copolymers and A–B Amphiphilic Block Copolymers, Allowing Rapid Formation of Sterically Stabilized Nanoparticles in Aqueous Media. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00099] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Jane Ford
- Department
of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
| | - Pierre Chambon
- Department
of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
| | - Jocelyn North
- Department
of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
| | - Fiona L. Hatton
- Department
of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
| | - Marco Giardiello
- Department
of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
| | - Andrew Owen
- Department
of Molecular and Clinical Pharmacology, University of Liverpool, Block H, 70 Pembroke Place, Liverpool L69 3GF, U.K
| | - Steve P. Rannard
- Department
of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
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228
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Bansal KK, Kakde D, Purdie L, Irvine DJ, Howdle SM, Mantovani G, Alexander C. New biomaterials from renewable resources – amphiphilic block copolymers from δ-decalactone. Polym Chem 2015. [DOI: 10.1039/c5py01203a] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Polymers for drug delivery applications have been synthesised via environmentally benign routes and with sustainable feedstocks.
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Affiliation(s)
- Kuldeep K. Bansal
- School of Pharmacy
- University of Nottingham
- University Park
- Nottingham NG7 2RD
- UK
| | - Deepak Kakde
- School of Pharmacy
- University of Nottingham
- University Park
- Nottingham NG7 2RD
- UK
| | - Laura Purdie
- School of Pharmacy
- University of Nottingham
- University Park
- Nottingham NG7 2RD
- UK
| | - Derek J. Irvine
- Department of Chemical and Environmental Engineering
- University of Nottingham
- UK
| | | | - Giuseppe Mantovani
- School of Pharmacy
- University of Nottingham
- University Park
- Nottingham NG7 2RD
- UK
| | - Cameron Alexander
- School of Pharmacy
- University of Nottingham
- University Park
- Nottingham NG7 2RD
- UK
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229
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Cao G, Guo X, Jia L, Tian X. Aggregation behaviours and bactericidal activities of novel cationic surfactants functionalized with amides and ether groups. RSC Adv 2015. [DOI: 10.1039/c4ra14645j] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Novel cationic surfactants exhibit high surface activity, interesting aggregation behaviors in aqueous solution and excellent bacterial activity.
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Affiliation(s)
- Guangzhou Cao
- Key Laboratory of Fine Chemicals of College of Heilongjiang Province
- Qiqihar University
- Qiqihar 161006
- China
| | - Xiangfeng Guo
- Key Laboratory of Fine Chemicals of College of Heilongjiang Province
- Qiqihar University
- Qiqihar 161006
- China
| | - Lihua Jia
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
| | - Xuhua Tian
- College of Chemistry and Chemical Engineering
- Qiqihar University
- Qiqihar 161006
- China
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230
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Sousa-Herves A, Wedepohl S, Calderón M. One-pot synthesis of doxorubicin-loaded multiresponsive nanogels based on hyperbranched polyglycerol. Chem Commun (Camb) 2015; 51:5264-7. [DOI: 10.1039/c5cc00644a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Doxorubicin-loaded nanogels with multiresponsive properties are prepared in a single step using hyperbranched polyglycerol as a biocompatible scaffold.
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Affiliation(s)
- Ana Sousa-Herves
- Institut für Chemie und Biochemie
- Freie Universität Berlin
- 14195 Berlin
- Germany
| | - Stefanie Wedepohl
- Institut für Chemie und Biochemie
- Freie Universität Berlin
- 14195 Berlin
- Germany
| | - Marcelo Calderón
- Institut für Chemie und Biochemie
- Freie Universität Berlin
- 14195 Berlin
- Germany
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231
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Peng S, Xu C, Hughes TC, Zhang X. From nanodroplets by the ouzo effect to interfacial nanolenses. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:12270-7. [PMID: 25262570 DOI: 10.1021/la502821m] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Polymerizing nanodroplets at solid-liquid interfaces is a facile solution-based approach to the functionalization of large surface areas with polymeric lens-shaped nanostructures. In this work, we have applied a one-pot approach to obtain polymeric nanolenses with controlled sizes and densities. We take advantage of the formation mechanism by the direct adsorption of nanodroplets from a surfactant-free microemulsion onto an immersed hydrophobic substrate. The interfacial nanodroplets were photopolymerized to produce polymeric nanolenses on the substrate surface. The surfactant-free microemulsion of the monomer nanodroplets was obtained through the spontaneous emulsification (i.e., ouzo effect) in the tertiary system of ethanol, water, and precusor monomer. The size of nanolenses on the surface was adjusted by the nanodroplet size, following a linear relationship with the ratio of the components in the microemulsion. This simple approach is applicable to produce nanolenses over the entire surface area or on any specific area at will by depositing a drop of the microemulsion. Possessing high optical transparency, the resulting substrates may have potential application as functional biomedical supporting materials or effective light-harvesting coatings.
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Affiliation(s)
- Shuhua Peng
- School of Civil, Environmental and Chemical Engineering, RMIT University , Melbourne, Victoria 3001, Australia
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232
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Chiu SJ, Wang SY, Chou HC, Liu YL, Hu TM. Versatile synthesis of thiol- and amine-bifunctionalized silica nanoparticles based on the ouzo effect. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:7676-7686. [PMID: 24927298 DOI: 10.1021/la501571u] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this article, we report a novel, nanoprecipitation-based method for preparing silica nanoparticles with thiol and amine cofunctionalization. (3-Mercaptopropyl)trimethoxysilane (MPTMS) and 3-aminopropyltrimethoxysilane (APTMS) were used as the organosilane precursors, which were subjected to acid-catalyzed polycondensation in an organic phase containing a water-miscible solvent (e.g., dimethyl sulfoxide). A pale colloidal solution could be immediately formed when the preincubated organic phase was directly injected into water. The initial composition ratio between MPTMS and APTMS is an important factor governing the formation of nanoparticles. Specifically, large, unstable micrometer-sized particles were formed for preparation using MPTMS as the sole silane source. In contrast, when APTMS was used alone, no particles could be formed. By reducing the fraction of APTMS (or increasing that of MPTMS) in the initial mixture of organosilanes, the formation of nanometer-sized particles occurred at a critical fraction of APTMS (i.e., 25%). Remarkably, a tiny fraction (e.g., 1%) of APTMS was sufficient to produce stable nanoparticles with a hydrodynamic diameter of about 200 nm. Other factors that would also affect particle formation were determined. Moreover, an interesting temperature effect on particle formation was observed. The TEM micrographs show spherical nanospheres with mean sizes of 130-150 nm in diameter. The solid-state (29)Si NMR spectra demonstrate that the hybrid silica materials contain fully and partially condensed silicon structures. The bifunctionalized silica nanoparticles have positive zeta potentials whose magnitudes are positively correlated with the amount of APTMS. The total thiol content, however, is negatively correlated with the amount of APTMS. The cationic nanoparticles can bind an antisense oligonucleotide in a composition-dependent manner.
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Affiliation(s)
- Shih-Jiuan Chiu
- School of Pharmacy, College of Pharmacy, Taipei Medical University , Taipei 11031, Taiwan ROC
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233
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Chakravarty R, Hong H, Cai W. Positron emission tomography image-guided drug delivery: current status and future perspectives. Mol Pharm 2014; 11:3777-97. [PMID: 24865108 PMCID: PMC4218872 DOI: 10.1021/mp500173s] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
![]()
Positron
emission tomography (PET) is an important modality in
the field of molecular imaging, which is gradually impacting patient
care by providing safe, fast, and reliable techniques that help to
alter the course of patient care by revealing invasive, de facto procedures
to be unnecessary or rendering them obsolete. Also, PET provides a
key connection between the molecular mechanisms involved in the pathophysiology
of disease and the according targeted therapies. Recently, PET imaging
is also gaining ground in the field of drug delivery. Current drug
delivery research is focused on developing novel drug delivery systems
with emphasis on precise targeting, accurate dose delivery, and minimal
toxicity in order to achieve maximum therapeutic efficacy. At the
intersection between PET imaging and controlled drug delivery, interest
has grown in combining both these paradigms into clinically effective
formulations. PET image-guided drug delivery has great potential to
revolutionize patient care by in vivo assessment
of drug biodistribution and accumulation at the target site and real-time
monitoring of the therapeutic outcome. The expected end point of this
approach is to provide fundamental support for the optimization of
innovative diagnostic and therapeutic strategies that could contribute
to emerging concepts in the field of “personalized medicine”.
This review focuses on the recent developments in PET image-guided
drug delivery and discusses intriguing opportunities for future development.
The preclinical data reported to date are quite promising, and it
is evident that such strategies in cancer management hold promise
for clinically translatable advances that can positively impact the
overall diagnostic and therapeutic processes and result in enhanced
quality of life for cancer patients.
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Affiliation(s)
- Rubel Chakravarty
- Department of Radiology, University of Wisconsin-Madison , Madison, Wisconsin 53705-2275, United States
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