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Coca-Hidalgo JJ, Recillas-Mota M, Fernández-Quiroz D, Lizardi-Mendoza J, Peniche-Covas C, Goycoolea FM, Argüelles-Monal WM. Study of the Thermal Phase Transition of Poly( N,N-diethylacrylamide- co- N-ethylacrylamide) Random Copolymers in Aqueous Solution. Polymers (Basel) 2024; 16:1575. [PMID: 38891521 PMCID: PMC11175111 DOI: 10.3390/polym16111575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2024] [Revised: 05/29/2024] [Accepted: 05/30/2024] [Indexed: 06/21/2024] Open
Abstract
N-alkyl-substituted polyacrylamides exhibit a thermal coil-to-globule transition in aqueous solution driven by an increase in hydrophobic interactions with rising temperature. With the aim of understanding the role of N-alkyl substituents in the thermal transition, this study focuses on the molecular interactions underlying the phase transition of poly(N,N-diethylacrylamide-co-N-ethylacrylamide) random copolymers. Poly(N,N-diethylacrylamide) (PDEAm), poly(N-ethylacrylamide) (PNEAm), and their random copolymers were synthesized by free radical polymerization and their chemical structure characterized spectroscopically. It was found that the values of the cloud-point temperature increased with PNEAm content, and particle aggregation processes took place, increasing the negative charge density on their surface. The cloud-point temperature of each copolymer decreased with respect to the theoretical values calculated assuming an absence of interactions. It is attributed to the formation of intra- and interchain hydrogen bonding in aqueous solutions. These interactions favor the formation of more hydrophobic macromolecular segments, thereby promoting the cooperative nature of the transition. These results definitively reveal the dominant mechanism occurring during the phase transition in the aqueous solutions of these copolymers.
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Affiliation(s)
- José Javier Coca-Hidalgo
- Centro de Investigación en Alimentación y Desarrollo, Hermosillo 83304, Mexico; (J.J.C.-H.); (M.R.-M.); (J.L.-M.)
| | - Maricarmen Recillas-Mota
- Centro de Investigación en Alimentación y Desarrollo, Hermosillo 83304, Mexico; (J.J.C.-H.); (M.R.-M.); (J.L.-M.)
| | - Daniel Fernández-Quiroz
- Departamento de Ingeniería Química y Metalurgia, Universidad de Sonora, Hermosillo 83000, Mexico;
| | - Jaime Lizardi-Mendoza
- Centro de Investigación en Alimentación y Desarrollo, Hermosillo 83304, Mexico; (J.J.C.-H.); (M.R.-M.); (J.L.-M.)
| | | | | | - Waldo M. Argüelles-Monal
- Centro de Investigación en Alimentación y Desarrollo, Hermosillo 83304, Mexico; (J.J.C.-H.); (M.R.-M.); (J.L.-M.)
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2
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Wang J, Liu L, Zhang S, Liao B, Zhao K, Li Y, Xu J, Chen L. Review of the Perspectives and Study of Thermo-Responsive Polymer Gels and Applications in Oil-Based Drilling Fluids. Gels 2023; 9:969. [PMID: 38131955 PMCID: PMC10742521 DOI: 10.3390/gels9120969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 11/30/2023] [Accepted: 12/08/2023] [Indexed: 12/23/2023] Open
Abstract
Thermoresponsive polymer gels are a type of intelligent material that can react to changes in temperature. These materials possess excellent innovative properties and find use in various fields. This paper systematically analyzes the methods for testing and regulating phase transition temperatures of thermo-responsive polymer gels based on their response mechanism. The report thoroughly introduces the latest research on thermo-responsive polymer gels in oil and gas extraction, discussing their advantages and challenges across various environments. Additionally, it elucidates how the application limitations of high-temperature and high-salt conditions can be resolved through process optimization and material innovation, ultimately broadening the scope of application of thermo-responsive polymer gels in oil and gas extraction. The article discusses the technological development and potential applications of thermo-responsive polymer gels in oil-based drilling fluids. This analysis aims to offer researchers in the oil and gas industry detailed insights into future possibilities for thermo-responsive polymer gels and to provide helpful guidance for their practical use in oil-based drilling fluids.
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Affiliation(s)
- Jintang Wang
- State Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China; (L.L.); (K.Z.); (Y.L.); (J.X.)
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China;
| | - Lei Liu
- State Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China; (L.L.); (K.Z.); (Y.L.); (J.X.)
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China;
| | - Siyang Zhang
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China;
| | - Bo Liao
- State Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China; (L.L.); (K.Z.); (Y.L.); (J.X.)
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China;
| | - Ke Zhao
- State Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China; (L.L.); (K.Z.); (Y.L.); (J.X.)
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China;
| | - Yiyao Li
- State Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China; (L.L.); (K.Z.); (Y.L.); (J.X.)
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China;
| | - Jiaqi Xu
- State Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China; (L.L.); (K.Z.); (Y.L.); (J.X.)
- School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China;
| | - Longqiao Chen
- CNPC Offshore Engineering Company Limited, Beijing 100028, China;
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Scaling-Up an Aqueous Self-Degassing Electrochemically Mediated ATRP in Dispersion for the Preparation of Cellulose-Polymer Composites and Films. Polymers (Basel) 2022; 14:polym14224981. [PMID: 36433108 PMCID: PMC9692721 DOI: 10.3390/polym14224981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Revised: 11/07/2022] [Accepted: 11/15/2022] [Indexed: 11/19/2022] Open
Abstract
Electrochemically mediated atom transfer radical polymerization (eATRP) is developed in dispersion conditions to assist the preparation of cellulose-based films. Self-degassing conditions are achieved by the addition of sodium pyruvate (SP) as a ROS scavenger, while an aluminum counter electrode provides a simplified and more cost-effective electrochemical setup. Different polyacrylamides were grown on a model cellulose substrate which was previously esterified with 2-bromoisobutyrate (-BriB), serving as initiator groups. Small-scale polymerizations (15 mL) provided optimized conditions to pursue the scale-up up to 1000 mL (scale-up factor ~67). Cellulose-poly(N-isopropylacrylamide) was then chosen to prepare the tunable, thermoresponsive, solvent-free, and flexible films through a dissolution/regeneration method. The produced films were characterized by Fourier-transform infrared (FTIR), scanning electron microscopy (SEM), dynamic scanning calorimetry (DSC), and thermogravimetric analysis (TGA).
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Yin H, Yan Q, Liu Y, Yang L, Liu Y, Luo Y, Chen T, Li N, Wu M. Co-encapsulation of paclitaxel and 5-fluorouracil in folic acid-modified, lipid-encapsulated hollow mesoporous silica nanoparticles for synergistic breast cancer treatment. RSC Adv 2022; 12:32534-32551. [PMID: 36425719 PMCID: PMC9661185 DOI: 10.1039/d2ra03718a] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 11/06/2022] [Indexed: 08/27/2023] Open
Abstract
A dual-loaded multi-targeted drug delivery nanosystem was constructed to simultaneously load paclitaxel (PTX) and 5-fluorouracil (5-FU) for targeted delivery and sustained release at tumor sites. Hollow mesoporous silica nanoparticles (HMSNs) were prepared by the inverse microemulsion method, then modified with folic acid and pH- and temperature-responsive materials, co-loaded with PTX and 5-FU, and finally encapsulated into lipid membranes. The obtained nanosystem was selectively internalized by human breast cancer MCF-7 cells that overexpress folate receptors through an energy-dependent process, and it released both drugs in vitro in a simulated tumor microenvironment. Moreover, the inhibitory effect of the dual-loaded nanoparticles was significantly better than that of the free drugs, suggesting that the composite nanosystem has the potential to selectively target tumor sites and perform the synergistic effect of PTX and 5-FU, while reducing their toxic effects on normal tissues.
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Affiliation(s)
- Huanli Yin
- School of Pharmacy, Chengdu Medical College No. 783 Xindu Avenue Xindu District Chengdu Sichuan Province P. R. China +86-28-6230-8653
- Department of Pharmacy, West China Hospital, Sichuan University Chengdu Sichuan Province P. R. China
| | - Qi Yan
- School of Pharmacy, Chengdu Medical College No. 783 Xindu Avenue Xindu District Chengdu Sichuan Province P. R. China +86-28-6230-8653
| | - Yuan Liu
- School of Pharmacy, Chengdu Medical College No. 783 Xindu Avenue Xindu District Chengdu Sichuan Province P. R. China +86-28-6230-8653
| | - Lan Yang
- School of Pharmacy, Chengdu Medical College No. 783 Xindu Avenue Xindu District Chengdu Sichuan Province P. R. China +86-28-6230-8653
| | - Yang Liu
- School of Pharmacy, Chengdu Medical College No. 783 Xindu Avenue Xindu District Chengdu Sichuan Province P. R. China +86-28-6230-8653
| | - Yujie Luo
- School of Pharmacy, Chengdu Medical College No. 783 Xindu Avenue Xindu District Chengdu Sichuan Province P. R. China +86-28-6230-8653
| | - Tianyu Chen
- School of Pharmacy, Chengdu Medical College No. 783 Xindu Avenue Xindu District Chengdu Sichuan Province P. R. China +86-28-6230-8653
| | - Ningxi Li
- School of Pharmacy, Chengdu Medical College No. 783 Xindu Avenue Xindu District Chengdu Sichuan Province P. R. China +86-28-6230-8653
| | - Min Wu
- School of Pharmacy, Chengdu Medical College No. 783 Xindu Avenue Xindu District Chengdu Sichuan Province P. R. China +86-28-6230-8653
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Comparison of different approaches to describe the thermotropic volume phase transition of smart microgels. Colloid Polym Sci 2022. [DOI: 10.1007/s00396-022-04950-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AbstractThe description of gel swelling by Flory and Rehner using the original Flory–Huggins interaction parameter for the polymer–solvent interaction cannot be applied to most smart microgels. Here, we compare descriptions of the swelling curves of such microgels using series expansions of the Flory–Huggins parameter $$\chi$$
χ
with the results of Hill-like equation for $$\chi$$
χ
. We study N-isopropyl-acrylamide particles at different concentrations of the cross-linker N,N-methylenebisacrylamide. The hydrodynamic radius $$R_{\mathrm {H}}$$
R
H
of the microgel particles is determined using photon correlation spectroscopy. The fits with the series expansion of $$\chi$$
χ
nicely follow the experimental data. However, already with the first-order series expansion, the computed $$\Theta$$
Θ
temperatures are not physically reasonable. Moreover, the physical meaning of the parameters of the series expansion is not clear. The Hill-like equation, which we recently introduced, yields a good description of all measured microgel swelling curves and provides physically meaningful parameters. For instance, the Hill parameter $$\nu$$
ν
corresponds to the number of water molecules per network chain cooperatively leaving the chain at the volume phase transition.
Graphical abstract
Different approaches to model the Flory-Huggins interaction parameter are explored and compared with respect to the quality of the fit of microgel swelling curves.
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Marsili L, Dal Bo M, Berti F, Toffoli G. Chitosan-Based Biocompatible Copolymers for Thermoresponsive Drug Delivery Systems: On the Development of a Standardization System. Pharmaceutics 2021; 13:1876. [PMID: 34834291 PMCID: PMC8620438 DOI: 10.3390/pharmaceutics13111876] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 10/27/2021] [Accepted: 11/02/2021] [Indexed: 12/26/2022] Open
Abstract
Chitosan is a natural polysaccharide that is considered to be biocompatible, biodegradable and non-toxic. The polymer has been used in drug delivery applications for its positive charge, which allows for adhesion with and recognition of biological tissues via non-covalent interactions. In recent times, chitosan has been used for the preparation of graft copolymers with thermoresponsive polymers such as poly-N-vinylcaprolactam (PNVCL) and poly-N-isopropylamide (PNIPAM), allowing the combination of the biodegradability of the natural polymer with the ability to respond to changes in temperature. Due to the growing interest in the utilization of thermoresponsive polymers in the biological context, it is necessary to increase the knowledge of the key principles of thermoresponsivity in order to obtain comparable results between different studies or applications. In the present review, we provide an overview of the basic principles of thermoresponsivity, as well as a description of the main polysaccharides and thermoresponsive materials, with a special focus on chitosan and poly-N-Vinyl caprolactam (PNVCL) and their biomedical applications.
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Affiliation(s)
- Lorenzo Marsili
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via Licio Giorgieri 1, 34127 Trieste, Italy;
| | - Michele Dal Bo
- Experimental and Clinical Pharmacology Unit, CRO National Cancer Institute IRCCS, Via Franco Gallini 2, 33081 Aviano, Italy; (M.D.B.); (G.T.)
| | - Federico Berti
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via Licio Giorgieri 1, 34127 Trieste, Italy;
| | - Giuseppe Toffoli
- Experimental and Clinical Pharmacology Unit, CRO National Cancer Institute IRCCS, Via Franco Gallini 2, 33081 Aviano, Italy; (M.D.B.); (G.T.)
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Yang XD, Chen W, Ren Y, Chu LY. Exploring the structural transition mechanisms of a pair of poly( N-isopropylacrylamide) chains in aqueous solution through coarse-grained molecular simulations coupled with metadynamics. MOLECULAR SIMULATION 2021. [DOI: 10.1080/08927022.2021.1881086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Xue-Dan Yang
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, People's Republic of China
- State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, People's Republic of China
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Wei Chen
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, People's Republic of China
- University of Chinese Academy of Sciences, Beijing, People's Republic of China
- Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian, Liaoning, People's Republic of China
| | - Ying Ren
- State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, People's Republic of China
- University of Chinese Academy of Sciences, Beijing, People's Republic of China
- Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, People's Republic of China
| | - Liang-Yin Chu
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, People's Republic of China
- State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, People's Republic of China
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Investigation of the LCST-Thermoresponsive Behavior of Novel Oligo(Ethylene Glycol)-Modified Pentafluorostyrene Homopolymers. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11062711] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Amphiphilic tetrafluorostyrene monomers (EFS8) carrying in the para position an oligoethylene glycol chain containing 8 oxyethylenic units on average were synthesized and used for preparation via activator regenerated by electron transfer atom transfer radical polymerization (ARGET-ATRP) of the corresponding amphiphilic homopolymers (pEFS8-x) with different degrees of polymerization (x = 26 and 46). Combining light transmittance and nano-differential scanning calorimetry (n-DSC) measurements revealed that pEFS8-x homopolymers displayed a lower critical solution temperature (LCST) thermoresponsive behavior in water solutions. Moreover, n-DSC measurements revealed the presence in heating scans of a broad endothermic peak ascribable to the dehydration process of the polymer single chains (unimers) and their collapse into aggregates. Consistently, dynamic light scattering (DLS) measurements showed below the LCST the presence of small nanostructures with a hydrodynamic diameter size Dh of 6–7 nm, which collapsed into concentration-dependent larger multichain aggregates (Dh = 300–3000 nm) above LCST. Interestingly, n-DSC data showed that the unimer-aggregate transition was reversible up to a specific temperature (Trev) of each homopolymer, which in any case was higher than Tmax. When heating above Trev the transition was no longer reversible, causing the shift of Tonset and Tmax at lower values, thus suggesting an increase in hydrophobicity of the polymer systems associated with a temperature-dependent dehydration process.
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Yadav R, Kumar S, Narang P, Venkatesu P. How does the addition of shape distinct gold nanoparticles influence on the conformational transition of poly(N-isopropylacrylamide)? J Colloid Interface Sci 2021; 582:478-487. [PMID: 32911396 DOI: 10.1016/j.jcis.2020.08.074] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 08/13/2020] [Accepted: 08/19/2020] [Indexed: 12/13/2022]
Abstract
HYPOTHESIS The subject of nanomaterials has created immense interest and expectations in the field of science and nanotechnology. Plentiful aspects proposed by gold nanoparticles (AuNPs) and their capability to affect macromolecular transition is the main driving force to execute the current study. A thermo-responsive polymer poly(N-isopropylacrylamide) (pNIPAM) is studied in presence of nanoparticles, particularly gold nanorods and nanospheres to elucidate completely the effect of their shape, surface area and structural morphology on the conformation of pNIPAM. EXPERIMENTS In this respect, several biophysical techniques such as fluorescence spectroscopy, dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) are utilized to examine the interaction of Au nanospheres/nanorods with pNIPAM. For a better understanding of Au nanoparticles morphology, transmission electron microscopy (TEM) is also employed. FINDINGS Introducing gold nanoparticles with the polymeric solution promotes the polymer to stay in the coil conformation at a higher temperature than the LCST of aqueous pNIPAM. A shift of 2 and 25.5 °C in the LCST of pNIPAM is observed along with Au nanospheres and nanorods, respectively. The current study provides a better impact in the field of biomedical science specifically drug delivery and tissue engineering as the LCST approaches human body temperature.
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Affiliation(s)
- Ritu Yadav
- Department of Chemistry, University of Delhi, Delhi 110 007, India
| | - Sumit Kumar
- Department of Chemistry, University of Delhi, Delhi 110 007, India
| | - Payal Narang
- Department of Chemistry, University of Delhi, Delhi 110 007, India
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Tamura A, Ohashi M, Tonegawa A, Kang TW, Zhang S, Yui N. Effect of Alkyl Chain Length of Acylated α‐Cyclodextrin‐Threaded Polyrotaxanes on Thermoresponsive Phase Transition Behavior. MACROMOL CHEM PHYS 2020. [DOI: 10.1002/macp.202000420] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Atsushi Tamura
- Department of Organic Biomaterials, Institute of Biomaterials and Bioengineering Tokyo Medical and Dental University (TMDU) 2‐3‐10 Kanda‐Surugadai Chiyoda Tokyo 101‐0062 Japan
| | - Moe Ohashi
- Department of Organic Biomaterials, Institute of Biomaterials and Bioengineering Tokyo Medical and Dental University (TMDU) 2‐3‐10 Kanda‐Surugadai Chiyoda Tokyo 101‐0062 Japan
| | - Asato Tonegawa
- Department of Organic Biomaterials, Institute of Biomaterials and Bioengineering Tokyo Medical and Dental University (TMDU) 2‐3‐10 Kanda‐Surugadai Chiyoda Tokyo 101‐0062 Japan
| | - Tae Woong Kang
- Department of Organic Biomaterials, Institute of Biomaterials and Bioengineering Tokyo Medical and Dental University (TMDU) 2‐3‐10 Kanda‐Surugadai Chiyoda Tokyo 101‐0062 Japan
| | - Shunyao Zhang
- Department of Organic Biomaterials, Institute of Biomaterials and Bioengineering Tokyo Medical and Dental University (TMDU) 2‐3‐10 Kanda‐Surugadai Chiyoda Tokyo 101‐0062 Japan
| | - Nobuhiko Yui
- Department of Organic Biomaterials, Institute of Biomaterials and Bioengineering Tokyo Medical and Dental University (TMDU) 2‐3‐10 Kanda‐Surugadai Chiyoda Tokyo 101‐0062 Japan
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Monitoring phase transition behavior of Poly(N-vinylcaprolactam) via nanostructure-based functionalized carbon nanotubes. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114062] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Liu X, Hou Y, Zhang Y, Zhang W. Thermoresponsive Polymers of Poly(2-( N-alkylacrylamide)ethyl acetate)s. Polymers (Basel) 2020; 12:E2464. [PMID: 33114303 PMCID: PMC7690893 DOI: 10.3390/polym12112464] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 10/16/2020] [Accepted: 10/20/2020] [Indexed: 01/03/2023] Open
Abstract
Thermoresponsive poly(2-(N-alkylacrylamide) ethyl acetate)s with different N-alkyl groups, including poly(2-(N-methylacrylamide) ethyl acetate) (PNMAAEA), poly(2-(N-ethylacrylamide) ethyl acetate) (PNEAAEA), and poly(2-(N-propylacrylamide) ethyl acetate) (PNPAAEA), as well as poly(N-acetoxylethylacrylamide) (PNAEAA), were synthesized by solution RAFT polymerization. Unexpectedly, it was found that there are induction periods in the RAFT polymerization of these monomers, and the induction time correlates with the length of the N-alkyl groups in the monomers and follows the order of NAEAA < NMAAEA < NEAAEA < NPAAEA. The solubility of poly(2-(N-alkylacrylamide) ethyl acetate)s in water is also firmly dependent on the length of the N-alkyl groups. PNPAAEA including the largest N-propyl group is insoluble in water, whereas PNMAAEA and PNEAAEA are thermoresponsive in water and undergo the reversible soluble-to-insoluble transition at a critical solution temperature. The cloud point temperature (Tcp) of the thermoresponsive polymers is in the order of PNEAAEA < PNAEAA < PNMAAEA. The parameters affecting the Tcp of thermoresponsive polymers, e.g., degree of polymerization (DP), polymer concentration, salt, urea, and phenol, are investigated. Thermoresponsive PNMAAEA-b-PNEAAEA block copolymer and PNMAAEA-co-PNEAAEA random copolymers with different PNMAAEA and/or PNEAAEA fractions are synthesized, and their thermoresponse is checked.
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Affiliation(s)
- Xue Liu
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
| | - Yuwen Hou
- Key Laboratory of Functional Polymer Materials of the Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China;
| | - Yimin Zhang
- Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
| | - Wangqing Zhang
- Key Laboratory of Functional Polymer Materials of the Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China;
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13
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Wang K, Liu Q, Liu G, Zeng Y. Novel thermoresponsive homopolymers of poly[oligo(ethylene glycol) (acyloxy) methacrylate]s: LCST-type transition in water and UCST-type transition in alcohols. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122746] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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14
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Narang P, de Oliveira TE, Venkatesu P, Netz PA. The role of osmolytes in the temperature-triggered conformational transition of poly(N-vinylcaprolactam): an experimental and computational study. Phys Chem Chem Phys 2020; 22:5301-5313. [PMID: 32096507 DOI: 10.1039/c9cp06683g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Biomedical industries are widely exploring the use of thermo-responsive polymers (TRPs) in the advanced development of drug delivery and in many other pharmaceutical applications. There is a great need to investigate the use of less toxic and more (bio-)compatible TRPs employing several additives, which could modify the conformational transition behavior of TRPs in aqueous solution. To move forward in this aspect, we have chosen the less toxic bio-based polymer poly(N-vinylcaprolactam) (PVCL) and three different methylamine-based osmolytes, trimethylamine N-oxide (TMAO), betaine and sarcosine, in order to investigate their particular interactions with the polymer segments in PVCL and therefore the corresponding changes in the thermo-responsive conformational behavior. Several biophysical techniques, UV-visible spectroscopy, fluorescence spectroscopy, dynamic light scattering (DLS) and laser Raman spectroscopy, as well as classical computer simulation methods such as molecular dynamics are employed in the current work. All the studied methylamines are found to favor the hydrophobic collapse of the polymer thus stabilizing the globular state of PVCL. Sarcosine is observed to cause the maximum decrease in lower critical solution temperature (LCST) of PVCL followed by TMAO and then betaine. The differences observed in the LCST values of PVCL in the presence of these molecules can be attributed to the different polymer-osmolyte interactions. The less sterically hindered N atom in the case of sarcosine causes a significant difference in the phase transition temperature values of PVCL compared to betaine and TMAO, where the nitrogen atom is buried by three methyl groups attached to it.
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Affiliation(s)
- Payal Narang
- Department of Chemistry, University of Delhi, Delhi-110007, India.
| | | | | | - Paulo A Netz
- Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
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15
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Biomass-derived carbon helices induced phase transition in poly(N-ispropylacrylamide): A sustainable tailoring of coil-globule transition in thermoresponsive polymer. Colloids Surf B Biointerfaces 2020; 187:110637. [DOI: 10.1016/j.colsurfb.2019.110637] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 10/17/2019] [Accepted: 11/09/2019] [Indexed: 11/22/2022]
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Yang L, Fan X, Zhang J, Ju J. Preparation and Characterization of Thermoresponsive Poly( N-Isopropylacrylamide) for Cell Culture Applications. Polymers (Basel) 2020; 12:polym12020389. [PMID: 32050412 PMCID: PMC7077488 DOI: 10.3390/polym12020389] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 01/07/2020] [Accepted: 01/17/2020] [Indexed: 12/20/2022] Open
Abstract
Poly(N-isopropylacrylamide) (PNIPAAm) is a typical thermoresponsive polymer used widely and studied deeply in smart materials, which is attractive and valuable owing to its reversible and remote "on-off" behavior adjusted by temperature variation. PNIPAAm usually exhibits opposite solubility or wettability across lower critical solution temperature (LCST), and it is readily functionalized making it available in extensive applications. Cell culture is one of the most prospective and representative applications. Active attachment and spontaneous detachment of targeted cells are easily tunable by surface wettability changes and volume phase transitions of PNIPAAm modified substrates with respect to ambient temperature. The thermoresponsive culture platforms and matching thermal-liftoff method can effectively substitute for the traditional cell harvesting ways like enzymatic hydrolysis and mechanical scraping, and will improve the stable and high quality of recovered cells. Therefore, the establishment and detection on PNIPAAm based culture systems are of particular importance. This review covers the important developments and recommendations for future work of the preparation and characterization of temperature-responsive substrates based on PNIPAAm and analogues for cell culture applications.
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Affiliation(s)
- Lei Yang
- College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China; (J.Z.); (J.J.)
- Correspondence: (L.Y.); (X.F.); Tel.: +86-024-5686-1705 (L.Y.); +86-024-8848-7119 (X.F.)
| | - Xiaoguang Fan
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
- Correspondence: (L.Y.); (X.F.); Tel.: +86-024-5686-1705 (L.Y.); +86-024-8848-7119 (X.F.)
| | - Jing Zhang
- College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China; (J.Z.); (J.J.)
| | - Jia Ju
- College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China; (J.Z.); (J.J.)
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Liu H, Ding A, Ma C, Huang X, Feng C, Wang Z, Wang Z, Lu G. The difluoromethylthio moiety lowers the LCST of oligo(ethylene glycol)-based homopolymers. Polym Chem 2020. [DOI: 10.1039/d0py00920b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Introduction of difluoromethylthio moiety could significantly lower LCSTs of oligo(ethylene glycol)-based thermo-responsive homopolymers.
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Affiliation(s)
- Haoyu Liu
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
| | - Aishun Ding
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
| | - Chen Ma
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
| | - Xiaoyu Huang
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
| | - Chun Feng
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
| | - Zhiqin Wang
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
| | - Zhaolei Wang
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
| | - Guolin Lu
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules
- Center for Excellence in Molecular Synthesis
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
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18
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Molecular description of the coil-to-globule transition of Poly(N-isopropylacrylamide) in water/ethanol mixture at low alcohol concentration. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.111928] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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19
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Zhang RQ, Liu ZQ, Luo YL, Xu F, Chen YS. Tri-stimuli responsive carbon nanotubes covered by mesoporous silica graft copolymer multifunctional materials for intracellular drug delivery. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2019.08.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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20
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Narang P, Venkatesu P. Efficacy of several additives to modulate the phase behavior of biomedical polymers: A comprehensive and comparative outlook. Adv Colloid Interface Sci 2019; 274:102042. [PMID: 31677492 DOI: 10.1016/j.cis.2019.102042] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 09/30/2019] [Accepted: 09/30/2019] [Indexed: 01/26/2023]
Abstract
Several new classes of polymeric materials are being introduced with unique properties. Thermoresponsive polymers (TRPs) are one of the most fascinating and emerging class of biomaterials in biomedical research. The design of TRPs with good response to temperature and its ability to exhibit coil to globular transition behavior near to physiological temperature made them more promising materials in the field of biomaterials and biomedicines. Instead of numerous studies on TRPs, the mechanistic interplay among several additives and TRPs is still not understood clearly and completely. The lack of complete understanding of biomolecular interactions of various additives with TRPs is limiting their applications in interdisciplinary science as well as pharmaceutical industry. There is a great need to provide a collective and comprehensive information of various additives and their behavior on widely accepted biopolymers, TRPs such as poly(N-isopropylacrylamide) (PNIPAM), poly(vinyl methyl ether) (PVME), poly(N-vinylcaprolactum) (PVCL) and poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) (PEG-PPG-PEG) in aqueous solution. Obviously, as the literature on the influence of various additives on TRPs is very vast, therefore we focus our review only on these four selected TRPs. Additives such as polyols, methylamines, surfactants and denaturants basically made the significant changes in water structure associated to polymer via their entropy variation which is the direct influence of their directly or indirectly binding abilities. Eventually, this review addresses a brief overview of the most recent literature of applications based phase behavior of four selected TRPs in response to external stimuli. The work enhances the knowledge for use of TRPs in the advanced development of drug delivery system and in many more pharmaceutical applications. These kinds of studies provide powerful impact in exploring the utility range of polymeric materials in various field of science.
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Affiliation(s)
- Payal Narang
- Department of Chemistry, University of Delhi, Delhi 110007, India
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21
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Umapathi R, Kumar K, Venkatesu P, Deenadayalu N. Quantifying the influence of ionic liquid on the phase behaviour of a biomedical thermoresponsive polymer: A biophysical experimental approach. REACT FUNCT POLYM 2019. [DOI: 10.1016/j.reactfunctpolym.2019.104327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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22
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Functionalized carbon nanotubes modulate the phase transition behavior of thermoresponsive polymer via hydrophilic-hydrophobic balance. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.121573] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Kumar K, Yadav R, Venkatesu P. Comprehensive Insight into the Protein-Surface Biomolecular Interactions on a Smart Material: Complex Formation between Poly( N-vinyl Caprolactam) and Heme Protein. J Phys Chem B 2019; 123:6331-6344. [PMID: 31265297 DOI: 10.1021/acs.jpcb.9b04521] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Proteins are naturally occurring biopolymers that exhibit a wide range of functional applications. Meticulous knowledge about biomolecular interactions between polymeric biomaterials and body fluids or proteins is essential for designing biospecific surfaces and understanding protein-polymer interactions beyond existing limitations. In this regard, we studied the comparative effect of heme proteins such as cytochrome c, myoglobin, and hemoglobin on the phase behavior of poly(N-vinyl caprolactam) (PVCL) aqueous solution and demonstrated various biomolecular interactions in the polymer-protein complex with the aid of various biophysical techniques. Absorption spectroscopy, steady-state fluorescence spectroscopy, Fourier transform infrared spectroscopy, dynamic light scattering studies, laser Raman spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy were carried out at room temperature to examine the changes in absorbance, fluorescence intensity, molecular interactions, particle size, agglomeration behavior, and surface morphologies. Furthermore, differential scanning calorimetry studies were also performed to analyze conformational changes, coil to globule transition, and phase behavior in the presence of proteins. With the addition of heme proteins, the lower critical solution temperature of PVCL increases toward higher temperature. The present study may help in designing smart biomaterials and stimulate more novel concepts in polymer-protein interactions. It also helps in the development of a biomimetic polymer for "smart" applications such as pulsatile drug release systems and controlled bioadhesion by temperature-mediated hydrophilic/hydrophobic switching.
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Affiliation(s)
- Krishan Kumar
- Department of Chemistry , University of Delhi , Delhi - 110 007 , India
| | - Ritu Yadav
- Department of Chemistry , University of Delhi , Delhi - 110 007 , India
| | - Pannuru Venkatesu
- Department of Chemistry , University of Delhi , Delhi - 110 007 , India
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24
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Pica A, Graziano G. Why does urea have a different effect on the collapse temperature of PDEAM and PNIPAM? J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.04.071] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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25
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Hou Y, Guo Y, Qian S, Khan H, Han G, Zhang W. A new thermoresponsive polymer of poly(N-acetoxylethyl acrylamide). POLYMER 2019. [DOI: 10.1016/j.polymer.2019.02.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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26
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Narang P, Venkatesu P. An efficient study to reach physiological temperature with poly(N-isopropylacrylamide) in presence of two differently behaving additives. J Colloid Interface Sci 2018; 538:62-74. [PMID: 30500468 DOI: 10.1016/j.jcis.2018.11.081] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Revised: 11/13/2018] [Accepted: 11/21/2018] [Indexed: 11/18/2022]
Abstract
HYPOTHESIS The new findings in the field of polymeric materials expanding their applications in improving the quality of health care are of primary concern. Undoubtedly, the alteration in surface properties of polymeric materials on addition of different additives may provide a step forward towards their better implications in many areas of science. In this regard, the interactions of poly(N-isopropylacrylamide) (PNIPAM) with two differently behaving additives may lead to a new method to carry the phase transition temperature of PNIPAM more near to body temperature so that it can be easily used in drug delivery through intravenous or oral insertion. EXPERIMENTS Individually, the addition of sodium dodceylsulfate (SDS) and trimethylamine N-oxide (TMAO) is increasing and decreasing the lower critical solution temperature (LCST) of PNIPAM as compared to classical LCST of PNIPAM in aqueous solution, respectively. In the present study, we try to emphasis the role of mixed SDS and TMAO environment in varying ratios on the phase transition behaviour of PNIPAM. Many biophysical techniques are employed such as UV-visible spectroscopy, fluorescence spectroscopy and dynamic light scattering (DLS), Laser Raman spectroscopy technique and Field emission scanning electron Microscopy (FESEM) for this part of work. FINDINGS The SDS is observed to form globules with PNIPAM segments and do not lead to turbidity of solution for the concentration greater than 10 µM. The negatively charged SDS bound PNIPAM globules that do not allow PNIPAM to associate, however; TMAO leads to turbid solution resulted from the hydrophobic association of PNIPAM. SDS is found to be very effective in increasing the LCST up to 62.8 °C even at very low (7.5 mM) concentration as compared to decreasing efficiency of TMAO where LCST reaches up to 29.4 °C for 0.75 M however, their mixture in specified concentration (1 mM SDS and 0.1 M TMAO) can bring the LCST of PNIPAM very near to body temperature (i.e. ∼36 °C) that is quiet promising for its use in target delivery engineering. TMAO ability to counteract the adverse effect of SDS is the main core reason in getting LCST near to body temperature.
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Affiliation(s)
- Payal Narang
- Department of Chemistry, University of Delhi, Delhi 110007, India
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27
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Velychkivska N, Starovoytova L, Březina V, Hanyková L, Hill JP, Labuta J. Improving the Colloidal Stability of Temperature-Sensitive Poly( N-isopropylacrylamide) Solutions Using Low Molecular Weight Hydrophobic Additives. ACS OMEGA 2018; 3:11865-11873. [PMID: 31459272 PMCID: PMC6645090 DOI: 10.1021/acsomega.8b01811] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 09/11/2018] [Indexed: 06/10/2023]
Abstract
Poly(N-isopropylacrylamide) (PNIPAM) is an important polymer with stimuli-responsive properties, making it suitable for various uses. Phase behavior of the temperature-sensitive PNIPAM polymer in the presence of four low-molecular weight additives tert-butylamine (t-BuAM), tert-butyl alcohol (t-BuOH), tert-butyl methyl ether (t-BuME), and tert-butyl methyl ketone (t-BuMK) was studied in water (D2O) using high-resolution nuclear magnetic resonance (NMR) spectroscopy and dynamic light scattering. Phase separation was thermodynamically modeled as a two-state process which resulted in a simple curve which can be used for fitting of NMR data and obtaining all important thermodynamic parameters using simple formulas presented in this paper. The model is based on a modified van't Hoff equation. Phase separation temperatures T p and thermodynamic parameters (enthalpy and entropy change) connected with the phase separation of PNIPAM were obtained using this method. It was determined that T p is dependent on additives in the following order: T p(t-BuAM) > T p(t-BuOH) > T p(t-BuME) > T p(t-BuMK). Also, either increasing the additive concentration or increasing pK a of the additive leads to depression of T p. Time-resolved 1H NMR spin-spin relaxation experiments (T 2) performed above the phase separation temperature of PNIPAM revealed high colloidal stability of the phase-separated polymer induced by the additives (relative to the neat PNIPAM/D2O system). Small quantities of selected suitable additives can be used to optimize the properties of PNIPAM preparations including their phase separation temperatures, colloidal stabilities, and morphologies, thus improving the prospects for the application.
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Affiliation(s)
- Nadiia Velychkivska
- Department
of NMR Spectroscopy, Institute of Macromolecular
Chemistry AS CR, v.v.i., Heyrovsky Sq. 2, Prague 6 162 06, Czech Republic
| | - Larisa Starovoytova
- Department
of NMR Spectroscopy, Institute of Macromolecular
Chemistry AS CR, v.v.i., Heyrovsky Sq. 2, Prague 6 162 06, Czech Republic
| | - Václav Březina
- Faculty
of Mathematics and Physics, Department of Macromolecular Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic
| | - Lenka Hanyková
- Faculty
of Mathematics and Physics, Department of Macromolecular Physics, Charles University, V Holešovičkách 2, 180 00 Prague 8, Czech Republic
| | - Jonathan P. Hill
- National
Institute for Materials Science (NIMS), International Center for Materials
Nanoarchitectonics (WPI-MANA), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Jan Labuta
- National
Institute for Materials Science (NIMS), International Center for Materials
Nanoarchitectonics (WPI-MANA), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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28
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Nowacka M, Rygała A, Kręgiel D, Kowalewska A. Poly(silsesquioxanes) and poly(siloxanes) grafted with N-acetylcysteine for eradicating mature bacterial biofilms in water environment. Colloids Surf B Biointerfaces 2018; 172:627-634. [PMID: 30223245 DOI: 10.1016/j.colsurfb.2018.09.017] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 08/27/2018] [Accepted: 09/07/2018] [Indexed: 11/19/2022]
Abstract
Bacteria adapt to their living environment forming organised biofilms. The survival strategy makes them more resistant to disinfectants, which results in acute biofilm-caused infections, secondary water pollution by biofilm metabolites and bio-corrosion. New, efficient and environmentally friendly strategies must be developed to solve this problem. Water soluble N-acetyl derivative of L-cysteine (NAC) is a non-toxic compound of mucolytic and bacteriostatic properties that can interfere with the formation of biofilms. However, it can also be a source of C and N for undesired microorganisms, as well as a reason for some adverse human health effects. Consequently, novel procedures are required, that would decrease the take-up of NAC but not reduce its antibacterial properties. We have grafted N-acetyl-l-cysteine onto linear poly(vinylsilsesquioxanes) and poly(methylvinylsiloxanes) via thiol-ene addition. Antibacterial activity of the obtained hybrid materials (respectively, NAC-Si-1 and NAC-Si-2) was determined against Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus strains. Native NAC inhibited growth of planktonic cells for the tested bacteria at concentration 0.25% w/v. Inhibition with equivalent solutions of the polymer derivatives was less effective due to the lack of SH groups. However, the tested polymers proved to be quite effective in eradication of mature biofilms. Treatment with 1% w/v emulsions of the hybrid polymers resulted in a significant reduction of viable cells in biofilm matrix despite the absence of thiol moieties. The effect was most pronounced for mature biofilms of S. aureus eradicated with NAC-Si-2.
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Affiliation(s)
- Maria Nowacka
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Łssódź, Poland
| | - Anna Rygała
- Institute of Fermentation Technology and Microbiology, Lodz University of Technology, Wólczańska 171/173, 90-924 Łssódź, Poland
| | - Dorota Kręgiel
- Institute of Fermentation Technology and Microbiology, Lodz University of Technology, Wólczańska 171/173, 90-924 Łssódź, Poland
| | - Anna Kowalewska
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Łssódź, Poland.
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29
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Wu J, Cheng C, Liu G, Zhang P, Chen T. The folding pathways and thermodynamics of semiflexible polymers. J Chem Phys 2018; 148:184901. [PMID: 29764123 DOI: 10.1063/1.5018114] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Inspired by the protein folding and DNA packing, we have systematically studied the thermodynamic and kinetic behaviors of single semiflexible homopolymers by Langevin dynamics simulations. In line with experiments, a rich variety of folding products, such as rod-like bundles, hairpins, toroids, and a mixture of them, are observed in the complete diagram of states. Moreover, knotted structures with a significant population are found in a certain range of bending stiffness in thermal equilibrium. As the solvent quality becomes poorer, the population of the intermediate occurring in the folding process increases, which leads to a severe chevron rollover for the folding arm. However, the population of the intermediates in the unfolding process is very low, insufficient to induce unfolding arm rollover. The total types of folding pathways from the coil state to the toroidal state for a semiflexible polymer chain remain unchanged by varying the solvent quality or temperature, whereas the kinetic partitioning into different folding events can be tuned significantly. In the process of knotting, three types of mechanisms, namely, plugging, slipknotting, and sliding, are discovered. Along the folding evolution, a semiflexible homopolymer chain can knot at any stage of folding upon leaving the extended coil state, and the probability to find a knot increases with chain compactness. In addition, we find rich types of knotted topologies during the folding of a semiflexible homopolymer chain. This study should be helpful in gaining insight into the general principles of biopolymer folding.
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Affiliation(s)
- Jing Wu
- Key Laboratory of Synthetic and Natural Functional Molecular Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, People's Republic of China
| | - Chenqian Cheng
- Key Laboratory of Synthetic and Natural Functional Molecular Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, People's Republic of China
| | - Gaoyuan Liu
- Key Laboratory of Synthetic and Natural Functional Molecular Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, People's Republic of China
| | - Ping Zhang
- Key Laboratory of Synthetic and Natural Functional Molecular Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, People's Republic of China
| | - Tao Chen
- Key Laboratory of Synthetic and Natural Functional Molecular Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710127, People's Republic of China
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Espinosa YR, Grigera RJ, Ferrara CG. Mechanisms associated with the effects of urea on the micellar structure of sodium dodecyl sulphate in aqueous solutions. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2018; 140:117-123. [PMID: 29758250 DOI: 10.1016/j.pbiomolbio.2018.05.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 04/10/2018] [Accepted: 05/08/2018] [Indexed: 10/14/2022]
Abstract
We used simulations by Molecular Dynamics to characterize the mechanism whereby the variations in the urea concentration modifies the micellar structure of sodium dodecyl sulfate monomers in water. From a self-assembled micellar system, we observed that increasing urea concentration leads to a decrease in aggregation number. Likewise, when increasing urea concentration, the micelles increase their nonpolar surface exposed to solvent, while the polar surface exposed to solvent decreases. This rearrangement process of SDS micelles in presence of urea is mainly due to the fact that the ions of Na+ that stabilize the micellar structure increase its interaction with urea. In this process, the SDS hydrophilic head and Na+ ions increases its solvation by urea, destabilizing micellar structure and exponing the hydrophobic core to the solvent.
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Affiliation(s)
- Yanis R Espinosa
- Institute of Physics of Liquids and Biological Systems (IFLYSIB), CONICET and National University of La Plata, Argentina
| | - Raúl J Grigera
- CEQUINOR, National University of La Plata and Conicet, Argentina
| | - C Gastón Ferrara
- Institute of Engineering and Agronomy, National University Arturo Jauretche, Av Calchaqui no. 6200, B1888BTE, Florencio Varela, Argentina; Institute of Physics of Liquids and Biological Systems (IFLYSIB), CONICET and National University of La Plata, Argentina.
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31
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Truzzolillo D, Sennato S, Sarti S, Casciardi S, Bazzoni C, Bordi F. Overcharging and reentrant condensation of thermoresponsive ionic microgels. SOFT MATTER 2018; 14:4110-4125. [PMID: 29664092 PMCID: PMC5968447 DOI: 10.1039/c7sm02357j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
We investigated the complexation of thermoresponsive anionic poly(N-isopropylacrylamide) (PNiPAM) microgels and cationic ε-polylysine (ε-PLL) chains. By combining electrophoresis, light scattering, transmission electron microscopy (TEM) and dielectric spectroscopy (DS) we studied the adsorption of ε-PLL onto microgel networks and its effect on the stability of suspensions. We show that the volume phase transition (VPT) of microgels triggers a large polyion adsorption. Two interesting phenomena with unique features occur: a temperature-dependent microgel overcharging and a complex reentrant condensation. The latter may occur at fixed polyion concentration, when temperature is raised above the VPT of microgels, or by increasing the number density of polycations at fixed temperature. TEM and DS measurements unambiguously show that short PLL chains adsorb onto microgels and act as electrostatic glue above the VPT. By performing thermal cycles, we further show that polyion-induced clustering is a quasi-reversible process: within the time of our experiments large clusters form above the VPT and partially re-dissolve as the mixtures are cooled down. Finally we give a proof that the observed phenomenology is purely electrostatic in nature: an increase of the ionic strength gives rise to polyion desorption from the microgel outer shell.
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Affiliation(s)
- Domenico Truzzolillo
- Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Université de Montpellier , 4 F-34095 Montpellier , France .
| | - Simona Sennato
- CNR-ISC UOS Roma, c/o Dipartimento di Fisica, Sapienza Università di Roma , P.le A. Moro 2 , 00185 Roma , Italy
| | - Stefano Sarti
- Dipartimento di Fisica, Sapienza Università di Roma , P.zzle A. Moro 2 , 00185 Roma , Italy .
| | - Stefano Casciardi
- National Institute for Insurance against Accidents at Work (INAIL Research), Department of Occupational and Environmental Medicine, Epidemiology and Hygiene , Roma , Italy
| | - Chiara Bazzoni
- Dipartimento di Fisica, Sapienza Università di Roma , P.zzle A. Moro 2 , 00185 Roma , Italy .
| | - Federico Bordi
- CNR-ISC UOS Roma, c/o Dipartimento di Fisica, Sapienza Università di Roma , P.le A. Moro 2 , 00185 Roma , Italy
- Dipartimento di Fisica, Sapienza Università di Roma , P.zzle A. Moro 2 , 00185 Roma , Italy .
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Tavagnacco L, Zaccarelli E, Chiessi E. On the molecular origin of the cooperative coil-to-globule transition of poly(N-isopropylacrylamide) in water. Phys Chem Chem Phys 2018; 20:9997-10010. [PMID: 29619464 PMCID: PMC5932979 DOI: 10.1039/c8cp00537k] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The cooperativity of PNIPAM coil-to-globule transition in water arises from the structuring of solvent in proximity to hydrophobic groups.
By means of atomistic molecular dynamics simulations we investigate the behaviour of poly(N-isopropylacrylamide), PNIPAM, in water at temperatures below and above the lower critical solution temperature (LCST), including the undercooled regime. The transition between water soluble and insoluble states at the LCST is described as a cooperative process involving an intramolecular coil-to-globule transition preceding the aggregation of chains and the polymer precipitation. In this work we investigate the molecular origin of such cooperativity and the evolution of the hydration pattern in the undercooled polymer solution. The solution behaviour of an atactic 30-mer at high dilution is studied in the temperature interval from 243 to 323 K with a favourable comparison to available experimental data. In the water soluble states of PNIPAM we detect a correlation between polymer segmental dynamics and diffusion motion of bound water, occurring with the same activation energy. Simulation results show that below the coil-to-globule transition temperature PNIPAM is surrounded by a network of hydrogen bonded water molecules and that the cooperativity arises from the structuring of water clusters in proximity to hydrophobic groups. Differently, the perturbation of the hydrogen bond pattern involving water and amide groups occurs above the transition temperature. Altogether these findings reveal that even above the LCST PNIPAM remains largely hydrated and that the coil-to-globule transition is related with a significant rearrangement of the solvent in the proximity of the surface of the polymer. The comparison between the hydrogen bonding of water in the surrounding of PNIPAM isopropyl groups and in the bulk displays a decreased structuring of solvent at the hydrophobic polymer–water interface across the transition temperature, as expected because of the topological extension along the chain of such interface. No evidence of an upper critical solution temperature behaviour, postulated in theoretical and thermodynamics studies of PNIPAM aqueous solution, is observed in the low temperature domain.
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Affiliation(s)
- L Tavagnacco
- CNR-ISC, Uos Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy
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33
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Narang P, Venkatesu P. Unravelling the role of polyols with increasing carbon chain length and OH groups on the phase transition behavior of PNIPAM. NEW J CHEM 2018. [DOI: 10.1039/c8nj02510j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In advanced applications of pharmaceutical, agricultural and biomedical research, thermoresponsive polymers (TRPs) are potential candidates which show conformational transitions at given temperatures.
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Affiliation(s)
- Payal Narang
- Department of Chemistry
- University of Delhi
- Delhi – 110 007
- India
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34
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Suzuki S, Sawada T, Ishizone T, Serizawa T. Bioinspired structural transition of synthetic polymers through biomolecular ligand binding. Chem Commun (Camb) 2018; 54:12006-12009. [DOI: 10.1039/c8cc06232c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The bioinspired structural transition of thermoresponsive poly(N-isopropylacrylamide) was demonstrated by specific ligand binding of artificially evolved peptides to the polymer.
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Affiliation(s)
- Seigo Suzuki
- Department of Chemical Science and Engineering
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Tokyo 152-8550
- Japan
| | - Toshiki Sawada
- Department of Chemical Science and Engineering
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Tokyo 152-8550
- Japan
| | - Takashi Ishizone
- Department of Chemical Science and Engineering
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Tokyo 152-8550
- Japan
| | - Takeshi Serizawa
- Department of Chemical Science and Engineering
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Tokyo 152-8550
- Japan
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35
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Magurudeniya HD, Ringstrand BS, Seifert S, Firestone MA. Reversible hierarchical structure induced by solvation and temperature modulation in an ionic liquid-based random bottlebrush copolymer. Polym Chem 2018. [DOI: 10.1039/c8py01218k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Discoidal bottlebrush poly(ionic liquid)s are reversibly stacked into 1-D rod like assembles by temperature changes.
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Affiliation(s)
- Harsha D. Magurudeniya
- Materials Physics & Applications Division
- Los Alamos National Laboratory
- Los Alamos
- USA 87545
| | - Bryan S. Ringstrand
- Materials Physics & Applications Division
- Los Alamos National Laboratory
- Los Alamos
- USA 87545
| | - Sönke Seifert
- X-ray Sciences Division
- Argonne National Laboratory
- Lemont
- USA 60439
| | - Millicent A. Firestone
- Materials Physics & Applications Division
- Los Alamos National Laboratory
- Los Alamos
- USA 87545
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36
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Zhang C, Yang M, Zhao K. Insight into the effect mechanism of urea-induced protein denaturation by dielectric spectroscopy. Phys Chem Chem Phys 2017; 19:32007-32015. [PMID: 29177311 DOI: 10.1039/c7cp05994a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dielectric relaxation spectroscopy was applied to study how urea affects the phase transition of a thermosensitive polymer, poly(N-isopropylacrylamide) (PNIPAM), which has been widely used as a protein model. It was found that there is a pronounced relaxation near 10 GHz for the ternary system of PNIPAM in urea aqueous solution. The temperature dependence of dielectric parameters indicates that urea can reduce the lower critical solution temperature (LCST) of PNIPAM, i.e., stabilize the globule state of PNIPAM and collapse the PNIPAM chains. Based on our results, the interaction mechanism of urea on the conformational transition of PNIPAM was presented: urea replaces water molecules directly bonding with PNIPAM and acts as the bridging agent for the adjacent side chains of PNIPAM. Accordingly, the mechanism with which urea denatures protein was deduced. In addition, it is worth mentioning that, from the temperature dependence of the dielectric parameters obtained in the presence of urea, an interesting phenomenon was found in which the effect of urea on PNIPAM seems to take 2 M as a unit. This result may be the reason why urea and TMAO exit marine fishes at a specific ratio of 2 : 1.
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Affiliation(s)
- Cancan Zhang
- College of Chemistry, Beijing Normal University, Beijing 100875, China.
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37
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Fong YT, Chen CH, Chen JP. Intratumoral Delivery of Doxorubicin on Folate-Conjugated Graphene Oxide by In-Situ Forming Thermo-Sensitive Hydrogel for Breast Cancer Therapy. NANOMATERIALS (BASEL, SWITZERLAND) 2017; 7:E388. [PMID: 29135959 PMCID: PMC5707605 DOI: 10.3390/nano7110388] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Revised: 11/03/2017] [Accepted: 11/07/2017] [Indexed: 12/12/2022]
Abstract
By taking advantage of the pH-sensitive drug release property of graphene oxide (GO) after intracellular uptake, we prepared folic acid (FA)-conjugated GO (GOFA) for targeted delivery of the chemotherapeutic drug doxorubicin (DOX). GOFA-DOX was further encapsulated in an injectable in-situ forming thermo-sensitive hyaluronic acid-chitosan-g-poly(N-isopropylacrylamide) (HACPN) hydrogel for intratumoral delivery of DOX. As the degradation time of HACPN could be extended up to 3 weeks, intratumoral delivery of GOFA-DOX/HACPN could provide controlled and targeted delivery of DOX through slow degradation HACPN and subsequent cellular uptake of released GOFA-DOX by tumor cells through interactions of GOFA with folate receptors on the tumor cell's surface. GOFA nano-carrier and HACPN hydrogel were first characterized for the physico-chemical properties. The drug loading experiments indicated the best preparation condition of GOFA-DOX was by reacting 0.1 mg GOFA with 2 mg DOX. GOFA-DOX showed pH-responsive drug release with ~5 times more DOX released at pH 5.5 than at pH 7.4 while only limited DOX was released from GOFA-DOX/HACPN at pH 7.4. Intracellular uptake of GOFA by endocytosis and release of DOX from GOFA-DOX in vitro could be confirmed from transmission electron microscopic and confocal laser scanning microscopic analysis with MCF-7 breast cancer cells. The targeting effect of FA was revealed when intracellular uptake of GOFA was blocked by excess FA. This resulted in enhanced in vitro cytotoxicity as revealed from the lower half maximal inhibitory concentration (IC50) value of GOFA-DOX (7.3 μg/mL) compared with that of DOX (32.5 μg/mL) and GO-DOX (10 μg/mL). The flow cytometry analysis indicated higher apoptosis rates for cells treated with GOFA-DOX (30%) compared with DOX (8%) and GO-DOX (11%). Animal studies were carried out with subcutaneously implanted MCF-7 cells in BALB/c nude mice and subject to intratumoral administration of drugs. The relative tumor volumes of control (saline) and GOFA-DOX/HACPN groups at day 21 were 2.17 and 1.79 times that at day 0 with no significant difference. In comparison, the relative tumor volumes of treatment groups at the same time were significantly different at 1.02, 0.67 and 0.48 times for DOX, GOFA-DOX and GOFA-DOX/HACPN groups, respectively. The anti-tumor efficacy was also supported by images from an in vivo imaging system (IVIS) using MCF-7 cells transfected with luciferase (MCF-7/Luc). Furthermore, tissue biopsy examination and blood analysis indicated that intratumoral delivery of DOX using GOFA-DOX/HACPN did not elicit acute toxicity. Taken together, GOFA-DOX/HACPN could be deemed as a safe and efficient intratumoral drug delivery system for breast cancer therapy.
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Affiliation(s)
- Yi Teng Fong
- Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
- Department of Plastic and Reconstructive Surgery and Craniofacial Research Center, Chang Gung Memorial Hospital, Linkou, Kwei-San, Taoyuan 33305, Taiwan.
| | - Chih-Hao Chen
- Department of Plastic and Reconstructive Surgery and Craniofacial Research Center, Chang Gung Memorial Hospital, Linkou, Kwei-San, Taoyuan 33305, Taiwan.
| | - Jyh-Ping Chen
- Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
- Department of Plastic and Reconstructive Surgery and Craniofacial Research Center, Chang Gung Memorial Hospital, Linkou, Kwei-San, Taoyuan 33305, Taiwan.
- Research Center for Chinese Herbal Medicine and Research Center for Food and Cosmetic Safety, College of Human Ecology, Chang Gung University of Science and Technology, Kwei-San, Taoyuan 33302, Taiwan.
- Department of Materials Engineering, Ming Chi University of Technology, Tai-Shan, New Taipei City 24301, Taiwan.
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38
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Narang P, Vepuri SB, Venkatesu P, Soliman ME. An unexplored remarkable PNIPAM-osmolyte interaction study: An integrated experimental and simulation approach. J Colloid Interface Sci 2017; 504:417-428. [DOI: 10.1016/j.jcis.2017.05.109] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 05/25/2017] [Accepted: 05/27/2017] [Indexed: 11/26/2022]
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39
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Jung S, MacConaghy KI, Kaar JL, Stoykovich MP. Enhanced Optical Sensitivity in Thermoresponsive Photonic Crystal Hydrogels by Operating Near the Phase Transition. ACS APPLIED MATERIALS & INTERFACES 2017; 9:27927-27935. [PMID: 28758737 DOI: 10.1021/acsami.7b07179] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Photonic crystal hydrogels composed of analyte-responsive hydrogels and crystalline colloidal arrays have immense potential as reagentless chemical and biological sensors. In this work, we investigated a general mechanism to rationally tune the sensitivity of photonic crystal hydrogels consisting of stimuli-responsive polymers to small molecule analytes. This mechanism was based on modulating the demixing temperature of such hydrogels relative to the characterization temperature to in effect maximize the extent of phase separation behavior; thus, the volume changes in response to the target analytes. Using ethanol as a model analyte, we demonstrated that this mechanism led to a dramatic increase in the sensitivity of optically diffracting poly(N-isopropylacrylamide) (pNIPAM) hydrogel films that exhibit a lower critical solution temperature (LCST) behavior. The demixing temperature of the pNIPAM films was modulated by copolymerization of the films with relatively hydrophobic and hydrophilic comonomers, as well as by varying the ionic strength of the characterization solution. Our results showed that copolymerization of the films with 2.5 mol % of N-tert-butylacrylamide, which is hydrophobic relative to pNIPAM, enabled the detection limit of the pNIPAM films to ethanol to be lowered ∼2-fold at 30 °C. Additionally, increasing the ionic strength of the characterization solution above 200 mM resulted in a dramatic increase in the extent of contraction of the films in the presence of ethanol. Ultimately, it was demonstrated that as little as 16 g/L or 2 vol % of ethanol in water could reliably be detected, and that the sensitivity of the films to ethanol was predictably greatest when operating near the phase transition, such that even small additions of the analyte induced the start of demixing and the collapse of the hydrogel. Such a mechanism may be extended to photonic crystal hydrogel sensors prepared from other stimuli-responsive polymers and more broadly exploited to enhance the utility of these sensors for a broad range of analytes.
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Affiliation(s)
- Sukwon Jung
- Department of Chemical and Biological Engineering, University of Colorado , Boulder, Colorado 80303, United States
| | - Kelsey I MacConaghy
- Department of Chemical and Biological Engineering, University of Colorado , Boulder, Colorado 80303, United States
| | - Joel L Kaar
- Department of Chemical and Biological Engineering, University of Colorado , Boulder, Colorado 80303, United States
| | - Mark P Stoykovich
- Institute for Molecular Engineering, University of Chicago , Chicago, Illinois 60637, United States
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40
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Marcisz K, Romanski J, Stojek Z, Karbarz M. Environmentally sensitive hydrogel functionalized with electroactive and complexing-iron(III) catechol groups. ACTA ACUST UNITED AC 2017. [DOI: 10.1002/pola.28697] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Kamil Marcisz
- Faculty of Chemistry; University of Warsaw; Warsaw 02-093 Poland
| | - Jan Romanski
- Faculty of Chemistry; University of Warsaw; Warsaw 02-093 Poland
| | - Zbigniew Stojek
- Faculty of Chemistry; University of Warsaw; Warsaw 02-093 Poland
| | - Marcin Karbarz
- Faculty of Chemistry; University of Warsaw; Warsaw 02-093 Poland
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41
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Zhang H, Wu W, Zhao X, Zhao Y. Synthesis and Thermoresponsive Behaviors of Thermo-, pH-, CO2-, and Oxidation-Responsive Linear and Cyclic Graft Copolymers. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00220] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Hongcan Zhang
- Suzhou Key Laboratory of
Macromolecular Design and Precision Synthesis, Jiangsu Key Laboratory
of Advanced Functional Polymer Design and Application, State and Local
Joint Engineering Laboratory for Novel Functional Polymeric Materials,
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Wentao Wu
- Suzhou Key Laboratory of
Macromolecular Design and Precision Synthesis, Jiangsu Key Laboratory
of Advanced Functional Polymer Design and Application, State and Local
Joint Engineering Laboratory for Novel Functional Polymeric Materials,
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Xiaoqi Zhao
- Suzhou Key Laboratory of
Macromolecular Design and Precision Synthesis, Jiangsu Key Laboratory
of Advanced Functional Polymer Design and Application, State and Local
Joint Engineering Laboratory for Novel Functional Polymeric Materials,
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Youliang Zhao
- Suzhou Key Laboratory of
Macromolecular Design and Precision Synthesis, Jiangsu Key Laboratory
of Advanced Functional Polymer Design and Application, State and Local
Joint Engineering Laboratory for Novel Functional Polymeric Materials,
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
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42
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Sangfai T, Tantishaiyakul V, Hirun N, Li L. Microphase Separation and Gelation of Methylcellulose in the Presence of Gallic Acid and NaCl as an In Situ Gel-Forming Drug Delivery System. AAPS PharmSciTech 2017; 18:605-616. [PMID: 27170164 DOI: 10.1208/s12249-016-0546-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 04/28/2016] [Indexed: 11/30/2022] Open
Abstract
Novel hydrogels of methylcellulose (MC) with gallic acid (GA) and NaCl were developed for an in situ gel-forming delivery system. Plain MC and GA/NaCl/MC were characterized using micro-differential scanning calorimetry (micro-DSC), rheological and turbidity methods. The gelation temperatures of MC were reduced to body temperature with adding GA/NaCl. GA and NaCl caused slightly different effects on the gelation/degelation temperatures during heating/cooling, respectively, based on the different sensitivities of these three techniques. The gelation mechanism was investigated by UV spectrophotometry, and the hydrophobic interaction between the aromatic ring of GA and MC was verified. The NaCl/MC hydrogel had smaller micropores than GA/MC and MC, indicating a greater cross-linked density. Doxycycline (DX) was loaded into the systems and demonstrated a synergistic effect of DX/GA. Both GA and DX exhibited a sustained release. The hydrogel of GA/4NaCl/MC could be potentially used for the in situ delivery of DX for deep wound healing.
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43
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Narang P, Venkatesu P. New endeavours involving the cooperative behaviour of TMAO and urea towards the globular state of poly(N-isopropylacrylamide). RSC Adv 2017. [DOI: 10.1039/c7ra05120d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Studies have provided evidence for the destruction of the hydrogen bonds of poly(N-isopropylacrylamide) (PNIPAM) in the presence of osmolytes such as trimethylamine N-oxide (TMAO) and urea.
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Affiliation(s)
- Payal Narang
- Department of Chemistry
- University of Delhi
- Delhi – 110007
- India
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44
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Umapathi R, Mkhize TY, Venkatesu P, Deenadayalu N. The influence of various alkylammonium-based ionic liquids on the hydration state of temperature-responsive polymer. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.11.060] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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45
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Chen S, Wang K, Zhang W. A new thermoresponsive polymer of poly(N-acryloylsarcosine methyl ester) with a tunable LCST. Polym Chem 2017. [DOI: 10.1039/c7py00274b] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A thermoresponsive polymer of the tertiary amide-based polyacrylamide, PNASME, was synthesized and its tunable thermoresponse was investigated.
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Affiliation(s)
- Shengli Chen
- Key Laboratory of Functional Polymer Materials of the Ministry of Education
- Institute of Polymer Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Ke Wang
- Key Laboratory of Functional Polymer Materials of the Ministry of Education
- Institute of Polymer Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Wangqing Zhang
- Key Laboratory of Functional Polymer Materials of the Ministry of Education
- Institute of Polymer Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
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46
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Ma J, Xuan S, Guerin AC, Yu T, Zhang D, Kuroda DG. Unusual molecular mechanism behind the thermal response of polypeptoids in aqueous solutions. Phys Chem Chem Phys 2017; 19:10878-10888. [DOI: 10.1039/c6cp08536a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The molecular mechanism behind the thermal response of the aqueous solutions of two identical polypeptoids with different architecture was studied. It was found the thermal response is initiated by a conformational change of the polymer backbone irrespective of the architecture.
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Affiliation(s)
- Jianbo Ma
- Department of Chemistry
- Louisiana State University
- Baton Rouge
- USA
| | - Sunting Xuan
- Department of Chemistry
- Louisiana State University
- Baton Rouge
- USA
| | - Abby C. Guerin
- Department of Chemistry
- Louisiana State University
- Baton Rouge
- USA
| | - Tianyi Yu
- Department of Chemistry
- Louisiana State University
- Baton Rouge
- USA
| | - Donghui Zhang
- Department of Chemistry
- Louisiana State University
- Baton Rouge
- USA
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47
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Su W, Yang M, Zhao K, Ngai T. Influence of Charged Groups on the Structure of Microgel and Volume Phase Transition by Dielectric Analysis. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b00809] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Wenjuan Su
- College
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Man Yang
- College
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Kongshuang Zhao
- College
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - To Ngai
- Department
of Chemistry, The Chinese University of Hong Kong, Shatin, N. T. Hong Kong, China
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48
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Exothermic nonreversing process in the phase transition of poly(N-isopropylacrylamide) studied with stochastic temperature-modulated DSC. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/polb.24089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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49
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Quartz crystal microbalance electrode modified with thermoresponsive crosslinked and non-crosslinked N-isopropylacrylamide polymers. Response to changes in temperature. J Solid State Electrochem 2016. [DOI: 10.1007/s10008-016-3231-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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50
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Gao Y, Yang J, Fan H, Ding Y, Ye X. Insight into the effect of methylated urea on the phase transition of aqueous solutions of poly(N
-isopropylacrylamide) by microcalorimetry: Hydrogen bonding and van der Waals interactions. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/polb.24018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Yating Gao
- Department of Chemical Physics; Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China; Hefei Anhui 230026 China
| | - Jinxian Yang
- Department of Chemical Physics; Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China; Hefei Anhui 230026 China
| | - Haiyan Fan
- Department of Chemical Physics; Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China; Hefei Anhui 230026 China
| | - Yanwei Ding
- Department of Chemical Physics; Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China; Hefei Anhui 230026 China
| | - Xiaodong Ye
- Department of Chemical Physics; Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China; Hefei Anhui 230026 China
- CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China; Hefei Anhui 230026 China
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