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Self-Organization in Dilute Aqueous Solutions of Thermoresponsive Star-Shaped Six-Arm Poly-2-Alkyl-2-Oxazines and Poly-2-Alkyl-2-Oxazolines. Polymers (Basel) 2021; 13:polym13091429. [PMID: 33946655 PMCID: PMC8125547 DOI: 10.3390/polym13091429] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 04/16/2021] [Accepted: 04/26/2021] [Indexed: 11/24/2022] Open
Abstract
The behavior of star-shaped six-arm poly-2-alkyl-2-oxazines and poly-2-alkyl-2-oxazolines in aqueous solutions on heating was studied by light scattering, turbidimetry and microcalorimetry. The core of stars was hexaaza [26] orthoparacyclophane and the arms were poly-2-ethyl-2-oxazine, poly-2-isopropyl-2-oxazine, poly-2-ethyl-2-oxazoline, and poly-2-isopropyl-2-oxazoline. The arm structure affects the properties of polymers already at low temperatures. Molecules and aggregates were present in solutions of poly-2-alkyl-2-oxazines, while aggregates of two types were observed in the case of poly-2-alkyl-2-oxazolines. On heating below the phase separation temperature, the characteristics of the investigated solutions did not depend practically on temperature. An increase in the dehydration degree of poly-2-alkyl-2-oxazines and poly-2-alkyl-2-oxazolines led to the formation of intermolecular hydrogen bonds, and aggregation was the dominant process near the phase separation temperature. It was shown that the characteristics of the phase transition in solutions of the studied polymer stars are determined primarily by the arm structure, while the influence of the molar mass is not so significant. In comparison with literature data, the role of the hydrophobic core structure in the formation of the properties of star-shaped polymers was analyzed.
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Oliveira ASR, Mendonça PV, Simões S, Serra AC, Coelho JFJ. Amphiphilic well‐defined degradable star block copolymers by combination of ring‐opening polymerization and atom transfer radical polymerization: Synthesis and application as drug delivery carriers. JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1002/pol.20200802] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Andreia S. R. Oliveira
- Centre for Mechanical Engineering, Materials and Processes, Department of Chemical Engineering University of Coimbra Coimbra Portugal
| | - Patrícia V. Mendonça
- Centre for Mechanical Engineering, Materials and Processes, Department of Chemical Engineering University of Coimbra Coimbra Portugal
| | - Sérgio Simões
- Faculty of Pharmacy University of Coimbra Coimbra Portugal
| | - Arménio C. Serra
- Centre for Mechanical Engineering, Materials and Processes, Department of Chemical Engineering University of Coimbra Coimbra Portugal
| | - Jorge F. J. Coelho
- Centre for Mechanical Engineering, Materials and Processes, Department of Chemical Engineering University of Coimbra Coimbra Portugal
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Cunningham AJ, Gibson VP, Banquy X, Zhu X, Jeanne LC. Cholic acid-based mixed micelles as siRNA delivery agents for gene therapy. Int J Pharm 2020; 578:119078. [DOI: 10.1016/j.ijpharm.2020.119078] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 01/13/2020] [Accepted: 01/22/2020] [Indexed: 12/22/2022]
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Kirila T, Smirnova A, Filippov A, Razina A, Tenkovtsev A, Filippov A. Thermosensitive star-shaped poly-2-ethyl-2-oxazine. Synthesis, structure characterization, conformation, and self-organization in aqueous solutions. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.109215] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Jiang W, Guo J, Wen W, Jia YG, Liu S. Nano-Carriers Based on pH-Sensitive Star-Shaped Copolymers for Drug-Controlled Release. MATERIALS 2019; 12:ma12101610. [PMID: 31100826 PMCID: PMC6566147 DOI: 10.3390/ma12101610] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 05/04/2019] [Accepted: 05/13/2019] [Indexed: 12/19/2022]
Abstract
Polymeric nano-carriers are considered as promising tools in biomedical applications due to multiple attractive characteristics including their low toxicity, high loading capacity, controlled drug release capabilities, and highly tunable chemical properties. Here, a series of pH-sensitive star-shaped copolymers, Ad-P[(EMA-co-MAA)-b-PPEGMA]4, was prepared via electron transfer atom radical polymerization (ARGETE ATRP) and selective hydrolysis. These star-shaped copolymers can be self-assembled into micelles (Dh = 150–160 nm) and their critical micelle concentrations (CMC) were estimated to be 3.9–5.0 mg/L. The pH-sensitiveness of the micelles was evidenced by transmission electron microscopy (TEM) and dynamic light scattering (DLS). The maximal paclitaxel (PTX) loading efficiency (DLC) and entrapment efficiency (EE) were 18.9% and 36%, respectively. In vitro release studies revealed that about 19% of the PTX released at an acidic condition of pH 1.2 over 70 h, whereas more than 70% was released within the same time interval at pH 6.8. In vitro cytotoxicity suggested that the low cytotoxicity of the blank micelles, while the PTX-loaded micelles providing the cytotoxicity close to that of free PTX. These results indicated that this novel pH-sensitive nano-carriers have great potential applications for oral drug-controlled release.
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Affiliation(s)
- Wenzhao Jiang
- School of Chemical Engineering & Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
| | - Jianwei Guo
- School of Chemical Engineering & Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
| | - Weiqiu Wen
- School of Chemical Engineering & Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
| | - Yong-Guang Jia
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China.
| | - Sa Liu
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China.
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Feng J, Wen W, Jia YG, Liu S, Guo J. pH-Responsive Micelles Assembled by Three-Armed Degradable Block Copolymers with a Cholic Acid Core for Drug Controlled-Release. Polymers (Basel) 2019; 11:E511. [PMID: 30960495 PMCID: PMC6473676 DOI: 10.3390/polym11030511] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Revised: 03/13/2019] [Accepted: 03/14/2019] [Indexed: 02/06/2023] Open
Abstract
One of the most famous anticancer drugs, paclitaxel (PTX), has often been used in drug controlled-release studies. The polymers derived from bio-compound bile acids and degradable poly(ε-caprolactone) (PCL) form a reservoir and have been used as a drug delivery system with great advantages. Herein, we grafted poly(N,N-diethylaminoethyl methacrylate) and poly(poly(ethylene glycol) methyl ether methacrylate) into the bile acid-derived three-armed macroinitiator CA-(PCL)₃, resulting in the amphiphilic block copolymers CA-(PCL-b-PDEAEMA-b-PPEGMA)₃. These pH-responsive three-armed block copolymers self-assembled into micelles in aqueous solution and PTX was encapsulated into the micellar core to form PTX-loaded micelles with a drug loading of 29.92 wt %. The micelles were stable in PBS at pH 7.4 and showed a pH-triggered release behavior of PTX under acidic environments, in which 55% of PTX was released at pH 5.0 in 80 h. These cholic acid-based functionalized three-armed block polymers present good biocompatibility, showing great potential for drug controlled-release.
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Affiliation(s)
- Jingjie Feng
- School of Chemical Engineering & Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
| | - Weiqiu Wen
- School of Chemical Engineering & Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
| | - Yong-Guang Jia
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China.
| | - Sa Liu
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China.
| | - Jianwei Guo
- School of Chemical Engineering & Light Industry, Guangdong University of Technology, Guangzhou 510006, China.
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Cunningham AJ, Robinson M, Banquy X, Leblond J, Zhu XX. Bile Acid-Based Drug Delivery Systems for Enhanced Doxorubicin Encapsulation: Comparing Hydrophobic and Ionic Interactions in Drug Loading and Release. Mol Pharm 2018; 15:1266-1276. [PMID: 29378128 DOI: 10.1021/acs.molpharmaceut.7b01091] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Doxorubicin (Dox) is a drug of choice in the design of drug delivery systems directed toward breast cancers, but is often limited by loading and control over its release from polymer micelles. Bile acid-based block copolymers present certain advantages over traditional polymer-based systems for drug delivery purposes, since they can enable a higher drug loading via the formation of a reservoir through their aggregation process. In this study, hydrophobic and electrostatic interactions are compared for their influence on Dox loading inside cholic acid based block copolymers. Poly(allyl glycidyl ether) (PAGE) and poly(ethylene glycol) (PEG) were grafted from the cholic acid (CA) core yielding a star-shaped block copolymer with 4 arms (CA-(PAGE- b-PEG)4) and then loaded with Dox via a nanoprecipitation technique. A high Dox loading of 14 wt % was achieved via electrostatic as opposed to hydrophobic interactions with or without oleic acid as a cosurfactant. The electrostatic interactions confer a pH responsiveness to the system. 50% of the loaded Dox was released at pH 5 in comparison to 12% at pH 7.4. The nanoparticles with Dox loaded via hydrophobic interactions did not show such a pH responsiveness. The systems with Dox loaded via electrostatic interactions showed the lowest IC50 and highest cellular internalization, indicating the pre-eminence of this interaction in Dox loading. The blank formulations are biocompatible and did not show cytotoxicity up to 0.17 mg/mL. The new functionalized star block copolymers based on cholic acid show great potential as drug delivery carriers.
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Affiliation(s)
- Alexander J Cunningham
- Département de Chimie , Université de Montréal , CP 6128, Succursale Centre-ville, Montréal , Quebec H3C 3J7 , Canada
| | - Mattieu Robinson
- Département de Gérontologie , Université de Sherbrooke , Sherbrooke , Quebec J1H 4C4 , Canada
| | - Xavier Banquy
- Faculté de Pharmacie , Université de Montréal , CP 6128, Succursale Centre-ville, Montréal , Quebec H3C 3J7 , Canada
| | - Jeanne Leblond
- Faculté de Pharmacie , Université de Montréal , CP 6128, Succursale Centre-ville, Montréal , Quebec H3C 3J7 , Canada
| | - X X Zhu
- Département de Chimie , Université de Montréal , CP 6128, Succursale Centre-ville, Montréal , Quebec H3C 3J7 , Canada
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Banquy X, Le Dévédec F, Cheng HW, Faivre J, Zhu JXX, Valtiner M. Interaction Forces between Pegylated Star-Shaped Polymers at Mica Surfaces. ACS APPLIED MATERIALS & INTERFACES 2017; 9:28027-28033. [PMID: 28770981 DOI: 10.1021/acsami.7b06922] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present a study focused on characterizing the interaction forces between mica surfaces across solutions containing star-shaped polymers with cationic ends. Using the surface forces apparatus, we show that the interaction forces in pure water between surfaces covered with the polymers can be adequately described by the dendronized brush model. In that framework, our experimental data suggest that the number of branches adsorbed at the surface decreases as the concentration of polymer in the adsorbing solution increases. The onset of interaction was also shown to increase with the concentration of polymer in solution up to distances much larger than the contour length of the polymer, suggesting that the nanostructure of the polymer film is significantly different from that of a monolayer. High compression of the polymer film adsorbed at low polymer concentration revealed the appearance of a highly structured hydration layer underneath the polymer layer. These results support that charged polymer chains do not necessarily come into close contact with the surface even if strong electrostatic interaction is present. Altogether, our results provide a comprehensive understanding of the interfacial behavior of star-shaped polymers and reveal the unexpected role of hydration water in the control of the polymer conformation.
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Affiliation(s)
| | | | - Hsiu-Wei Cheng
- Interface Chemistry and Surface Engineering, Max-Planck-Institut fír Eisenforschung , Max-Planck-Straße 1, 40237 Düsseldorf, Germany
- Institut fír Physikalische Chemie, TU Bergakademie Freiberg , Leipziger Straße 29, 09599 Freiberg, Germany
| | | | | | - Markus Valtiner
- Interface Chemistry and Surface Engineering, Max-Planck-Institut fír Eisenforschung , Max-Planck-Straße 1, 40237 Düsseldorf, Germany
- Institut fír Physikalische Chemie, TU Bergakademie Freiberg , Leipziger Straße 29, 09599 Freiberg, Germany
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Influence of arm length on aqueous solution behavior of thermosensitive poly(2-isopropyl-2-oxazoline) stars. Colloid Polym Sci 2016. [DOI: 10.1007/s00396-016-3984-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Stoyanova B, Novakov C, Tsvetanov CB, Rangelov S. Synthesis and Aqueous Solution Properties of Block Copolyethers with Latent Chemical Functionality. MACROMOL CHEM PHYS 2016. [DOI: 10.1002/macp.201600284] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Boyana Stoyanova
- Institute of Polymers; Bulgarian Academy of Sciences; Akad. G. Bonchev Str. 103-A 1113 Sofia Bulgaria
| | - Christo Novakov
- Institute of Polymers; Bulgarian Academy of Sciences; Akad. G. Bonchev Str. 103-A 1113 Sofia Bulgaria
| | - Christo B. Tsvetanov
- Institute of Polymers; Bulgarian Academy of Sciences; Akad. G. Bonchev Str. 103-A 1113 Sofia Bulgaria
| | - Stanislav Rangelov
- Institute of Polymers; Bulgarian Academy of Sciences; Akad. G. Bonchev Str. 103-A 1113 Sofia Bulgaria
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Actively targeted delivery of anticancer drug to tumor cells by redox-responsive star-shaped micelles. Biomaterials 2014; 35:8711-22. [DOI: 10.1016/j.biomaterials.2014.06.036] [Citation(s) in RCA: 157] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Accepted: 06/19/2014] [Indexed: 01/03/2023]
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