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Dey D, Dhara D. Interaction between linear PEGylated cationic block copolymers and human serum albumin. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.10.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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27
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Dutta S, Dhara D. Effect of preparation temperature on salt-induced deswelling and pattern formation in poly(N-isopropylacrylamide) hydrogels. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.08.052] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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28
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Dutta S, Dhara D. Improved swelling-deswelling behavior of poly(N-isopropyl acrylamide) gels with poly(N,N′-dimethyl aminoethyl methacrylate) grafts. J Appl Polym Sci 2015. [DOI: 10.1002/app.42749] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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29
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Banerjee R, Maiti C, Dutta S, Dhara D. Size- and distance-dependent excitation energy transfer in fluorophore conjugated block copolymer – gold nanoparticle systems. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.01.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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30
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Atta S, Paul A, Banerjee R, Bera M, Ikbal M, Dhara D, Singh NDP. Photoresponsive polymers based on a coumarin moiety for the controlled release of pesticide 2,4-D. RSC Adv 2015. [DOI: 10.1039/c5ra18944f] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report an excellent photoresponsive controlled release formulation based on a coumarin copolymer for pesticide 2,4-D.
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Dey D, Maiti C, Maiti S, Dhara D. Interaction between calf thymus DNA and cationic bottle-brush copolymers: equilibrium and stopped-flow kinetic studies. Phys Chem Chem Phys 2015; 17:2366-77. [DOI: 10.1039/c4cp03309d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polyplex formation betweenctDNA and PEGylated cationic bottle-brush copolymers: PEG influences the DNA compaction behavior and the kinetics of polyplex formation.
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Banerjee R, Parida S, Maiti C, Mandal M, Dhara D. pH-degradable and thermoresponsive water-soluble core cross-linked polymeric nanoparticles as potential drug delivery vehicle for doxorubicin. RSC Adv 2015. [DOI: 10.1039/c5ra17158j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Doxorubicin release at preferred lysosomal pH of the cancer cells due to pH-induced de-crosslinking of polymer nanoparticle core.
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Maiti C, Banerjee R, Maiti S, Dhara D. pH-induced vesicle-to-micelle transition in amphiphilic diblock copolymer: investigation by energy transfer between in situ formed polymer embedded gold nanoparticles and fluorescent dye. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 31:32-41. [PMID: 25494810 DOI: 10.1021/la504165e] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The ability to regulate the formation of nanostructures through self-assembly of amphiphilic block copolymers is of immense significance in the field of biology and medicine. In this work, a new block copolymer synthesized by using reversible addition-fragmentation chain transfer (RAFT) polymerization technique from poly(ethylene glycol) monomethyl ether acrylate (PEGMA) and Boc-l-tryptophan acryloyloxyethyl ester (Boc-l-trp-HEA) was found to spontaneously form pH-responsive water-soluble nanostructures after removal of the Boc group. While polymer vesicles or polymerosomes were formed at physiological pH, the micelles were formed at acidic pH (< 5.2), and this facilitated a pH-induced reversible vesicle-to-micelle transition. Formation of these nanostructures was confirmed by different characterization techniques, viz. transmission electron microscopy, dynamic light scattering, and steady-state fluorescence measurements. Further, these vesicles were successfully utilized to reduce HAuCl4 and stabilize the resulting gold nanoparticles (AuNPs). These AuNPs, confined within the hydrophobic shell of the vesicles, could participate in energy transfer process with fluorescent dye molecules encapsulated in the core of the vesicles, thus forming a nanometal surface energy transfer (NSET) pair. Subsequently, following the efficiency of energy transfer between this pair, it was possible to monitor the process of transition from vesicles to micelles. Thus, in this work, we have successfully demonstrated that NSET can be used to follow the transition between nanostructures formed by amphiphilic block copolymers.
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Sahoo B, Devi KSP, Dutta S, Maiti TK, Pramanik P, Dhara D. Biocompatible mesoporous silica-coated superparamagnetic manganese ferrite nanoparticles for targeted drug delivery and MR imaging applications. J Colloid Interface Sci 2014; 431:31-41. [DOI: 10.1016/j.jcis.2014.06.003] [Citation(s) in RCA: 150] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Revised: 05/31/2014] [Accepted: 06/02/2014] [Indexed: 11/29/2022]
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Banerjee C, Maiti S, Mustafi M, Kuchlyan J, Banik D, Kundu N, Dhara D, Sarkar N. Effect of encapsulation of curcumin in polymeric nanoparticles: how efficient to control ESIPT process? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10834-44. [PMID: 25148375 DOI: 10.1021/la5023533] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
This paper demonstrates the photophysics of curcumin inside polymeric nanoparticles (NPs), which are being recently used as targeted drug delivery vehicles. For this purpose, we have prepared three polymeric NPs by ultrasonication method from three well-defined water-insoluble random copolymers. These copolymers having various degrees of hydrophobicity were synthesized via reversible addition-fragmentation transfer (RAFT) method using styrene and three different functional monomers, namely, 2-hydroxyethyl acrylate, 4-formylphenyl acrylate, and 4-vinylbenzyl chloride. The photophysics of the curcumin molecules inside the polymeric NPs have been monitored by applying tools like steady state and time-resolved fluorescence spectroscopy. An increase in fluorescence intensity along with an increase in the lifetime values indicated a perturbation of the excited state intramolecular proton transfer (ESIPT) process of curcumin inside the polymeric NPs.
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Dey D, Kumar S, Banerjee R, Maiti S, Dhara D. Polyplex Formation between PEGylated Linear Cationic Block Copolymers and DNA: Equilibrium and Kinetic Studies. J Phys Chem B 2014; 118:7012-25. [DOI: 10.1021/jp501234p] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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37
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Banerjee R, Pal DS, Dhara D. Synthesis of a new rhodamine-containing block copolymer for highly selective and sensitive detection of Cu2+
and CN−
ions in aqueous media. POLYM INT 2014. [DOI: 10.1002/pi.4742] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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38
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Banerjee R, Dhara D. Functional group-dependent self-assembled nanostructures from thermo-responsive triblock copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:4137-4146. [PMID: 24650226 DOI: 10.1021/la500213h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The ability to control the formation of nanostructures through self-assembly of amphiphilic block copolymers is of great interest in the field of biology and catalysis. In this work we have studied the self-assembling behavior of a new class of thermo-responsive triblock copolymers containing poly(ethylene glycol), and demonstrated the manner in which the aggregation pattern changed on simple functional group transformation on the copolymers. Two different triblock copolymers, poly(ethylene glycol)-b-poly(N-ispropylacrylamide)-b-poly(t-butyl acrylate) (P1) and poly(ethylene glycol)-b-poly(N-isopropylacrylamide)-b-poly(glycidyl methacrylate) (P2) were synthesized using reversible addition-fragmentation chain transfer (RAFT) technique. It was observed that P1 and P2 displayed different temperature dependent solution properties in water, with P1 forming micelles above the LCST of the PNIPA while P2 showing macroscopic phase separation under similar conditions. Thereafter, the tert-butyl group of P1 was converted to the corresponding acid (P1a) and the epoxy groups of P2 was converted to diols (P2a), thus transforming the hydrophobic blocks to hydrophilic ones. Quite interestingly, such transformations led to significant changes in their self-assembling behavior, as both P1a and P2a were seen to form vesicles beyond the LCST of PNIPA. Changes in the hydrophilic fraction in the block copolymers by subtle changes in the functionality and temperature led to the formation of varied nanostructured assemblies, as evident from dynamic light scattering (DLS), transmisison electron microscopy (TEM), and steady-state fluorescence analysis. Such formation of thermo-responsive vesicles induced by simple structural changes in the copolymers is quite interesting and highly significant in drug delivery applications.
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Maiti C, Dey D, Mandal S, Dhara D. Thermoregulated formation and disintegration of cationic block copolymer vesicles: fluorescence resonance energy transfer study. J Phys Chem B 2014. [PMID: 24490812 DOI: 10.1021/jp412273h.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Formation and disintegration of self-assembled nanostructures in response to external stimuli are important phenomena that have been widely explored for a variety of biomedical applications. In this contribution, we report the thermally triggered assembly of block copolymer molecules in aqueous solution to form vesicles (polymersomes) and their disassembly on reduction of temperature. A new thermoresponsive diblock copolymer of poly(N-isopropylacrylamide) poly((3-methacrylamidopropyl)trimethylammonium chloride) (PNIPA-b-PMAPTAC) was synthesized by reversible addition-fragmentation chain transfer technique. The solution properties and self-assembling behavior of the block copolymer molecules were studied by turbidimetry, temperature-dependent proton nuclear magnetic resonance, fluorescence spectroscopy, dynamic light scattering, and transmission electron microscopy. Fluorescence resonance energy transfer studies between coumarin-153 (C-153, donor) and rhodamine 6G (R6G, acceptor) have been performed by steady-state and picosecond-resolved fluorescence spectroscopy to probe the structural and dynamic heterogeneity of the vesicles. The occurrence of efficient energy transfer was evident from the shortening of donor lifetime in the presence of the acceptor. The capability of the vesicles to encapsulate both hydrophobic and hydrophilic molecules and release them in response to decrease in temperature makes them potentially useful as drug delivery vehicles.
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Maiti C, Dey D, Mandal S, Dhara D. Thermoregulated Formation and Disintegration of Cationic Block Copolymer Vesicles: Fluorescence Resonance Energy Transfer Study. J Phys Chem B 2014; 118:2274-83. [PMID: 24490812 DOI: 10.1021/jp412273h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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41
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Banerjee R, Gupta S, Dey D, Maiti S, Dhara D. Synthesis of PEG containing cationic block copolymers and their interaction with human serum albumin. REACT FUNCT POLYM 2014. [DOI: 10.1016/j.reactfunctpolym.2013.11.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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42
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Dey D, Kumar S, Maiti S, Dhara D. Stopped-flow kinetic studies of poly(amidoamine) dendrimer-calf thymus DNA to form dendriplexes. J Phys Chem B 2013; 117:13767-74. [PMID: 24087941 DOI: 10.1021/jp406973t] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Poly(amidoamine) (PAMAM) dendrimers are known to be highly efficient nonviral carriers in gene delivery. Dendrimer-mediated transfection is known to be a function of the dendrimer to DNA charge ratio as well as the size of the dendrimer. In the present study, the binding kinetics of four PAMAM dendrimers (G1, G2, G3, and G4) with calf thymus DNA (CT-DNA) has been studied using stopped-flow fluorescence spectroscopy. The effect of dendrimer-to-DNA charge ratio and dendrimer generation on the binding kinetics was investigated. In most cases, the results of dendrimer-CT-DNA binding can be explained by a two-step reaction mechanism: a rapid electrostatic binding between the dendrimer and DNA, followed by a conformational change of the dendrimer-DNA complex that ultimately leads to DNA condensation. It was observed that the charge ratio on the dendrimer and the DNA phosphate groups, as well as the dendrimer generation (size), has a marked effect on the kinetics of binding between the DNA and the dendrimers. The rate constant (k'1) of the first step was much higher compared to that of the second step (k'2), and both were found to increase with an increase in dendrimer concentration. Among the four generations of dendrimers, G4 exhibited significantly faster binding kinetics compared to the three smaller generation dendrimers.
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43
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Dutta S, Dey D, Dhara D. Poly(ethylene glycol)-containing cationic hydrogels with lipophilic character. J Appl Polym Sci 2013. [DOI: 10.1002/app.39873] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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44
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Sahoo B, Devi KSP, Banerjee R, Maiti TK, Pramanik P, Dhara D. Thermal and pH responsive polymer-tethered multifunctional magnetic nanoparticles for targeted delivery of anticancer drug. ACS APPLIED MATERIALS & INTERFACES 2013; 5:3884-3893. [PMID: 23551195 DOI: 10.1021/am400572b] [Citation(s) in RCA: 118] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Targeted and efficient delivery of therapeutics to tumor cells is one of the key issues in cancer therapy. In the present work, we report a temperature and pH dual responsive core-shell nanoparticles comprising smart polymer shell coated on magnetic nanoparticles as an anticancer drug carrier and cancer cell-specific targeting agent. Magnetite nanoparticles (MNPs), prepared by a simple coprecipitation method, was surface modified by introducing amine groups using 3-aminopropyltriethoxysilane. Dual-responsive poly(N-isopropylacrylamide)-block-poly(acrylic acid) copolymer, synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization, was then attached to the amine-functionalized MNPs via EDC/NHS method. Further, to accomplish cancer-specific targeting properties, folic acid was tethered to the surface of the nanoparticles. Thereafter, rhodamine B isothiocyanate was conjugated to endow fluorescent property to the MNPs required for cellular imaging applications. The nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), thermogravimetric analysis (TGA), zeta potential, vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS) measurements, and FTIR, UV-vis spectral analysis. Doxorubicin (DOX), an anticancer drug used for the present study, was loaded into the nanoparticles and its release behavior was subsequently studied. Result showed a sustained release of DOX preferentially at the desired lysosomal pH and temperature condition. The biological activity of the DOX-loaded MNPs was studied by MTT assay, fluorescence microscopy, and apoptosis. Intracellular-uptake studies revealed preferential uptake of these nanoparticles into cancer cells (HeLa cells) compared to normal fibroblast cells (L929 cells). The in vitro apoptosis study revealed that the DOX-loaded nanoparticles caused significant death to the HeLa cells. These nanoparticles were capable of target specific release of the loaded drug in response to pH and temperature and hence may serve as a potential drug carrier for in vivo applications.
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Banerjee R, Dutta S, Pal S, Dhara D. Spontaneous Formation of Vesicles by Self-Assembly of Cationic Block Copolymer in the Presence of Anionic Surfactants and Their Application in Formation of Polymer Embedded Gold Nanoparticles. J Phys Chem B 2013; 117:3624-33. [PMID: 23470131 DOI: 10.1021/jp309808q] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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46
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Sahoo B, Sahu SK, Bhattacharya D, Dhara D, Pramanik P. A novel approach for efficient immobilization and stabilization of papain on magnetic gold nanocomposites. Colloids Surf B Biointerfaces 2013; 101:280-9. [DOI: 10.1016/j.colsurfb.2012.07.003] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Revised: 07/02/2012] [Accepted: 07/06/2012] [Indexed: 10/28/2022]
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47
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Sahoo B, Devi KSP, Sahu SK, Nayak S, Maiti TK, Dhara D, Pramanik P. Facile preparation of multifunctional hollow silica nanoparticles and their cancer specific targeting effect. Biomater Sci 2013; 1:647-657. [DOI: 10.1039/c3bm00007a] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Ikbal M, Banerjee R, Atta S, Dhara D, Anoop A, Singh NDP. Synthesis, Photophysical and Photochemical Properties of Photoacid Generators Based on N-Hydroxyanthracene-1,9-dicarboxyimide and Their Application toward Modification of Silicon Surfaces. J Org Chem 2012; 77:10557-67. [DOI: 10.1021/jo301367y] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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49
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Ikbal M, Banerjee R, Atta S, Jana A, Dhara D, Anoop A, Singh NDP. Development of 1-Hydroxy-2(1H)-quinolone-Based Photoacid Generators and Photoresponsive Polymer Surfaces. Chemistry 2012; 18:11968-75. [DOI: 10.1002/chem.201104065] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2011] [Revised: 05/23/2012] [Indexed: 11/12/2022]
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50
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Banerjee R, Maiti S, Dhara D. Water-soluble nanoparticles from poly(ethylene glycol)-based cationic random copolymers and double-tail surfactant. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2011.12.043] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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