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Hanck-Silva G, Minatti E. Polystyrene-b-poly (acrylic acid) nanovesicles coated by modified chitosans for encapsulation of minoxidil. BRAZ J PHARM SCI 2022. [DOI: 10.1590/s2175-9790202132e19106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Rengifo AFC, Stefanes NM, Toigo J, Mendes C, Argenta DF, Dotto MER, Santos da Silva MC, Nunes RJ, Caon T, Parize AL, Minatti E. PEO-chitosan nanofibers containing carboxymethyl-hexanoyl chitosan/dodecyl sulfate nanoparticles loaded with pyrazoline for skin cancer treatment. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.08.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Chamorro Rengifo AF, Stefanes N, Toigo J, Mendes C, Santos-Silva MC, Nunes RJ, Parize AL, Minatti E. A new and efficient carboxymethyl-hexanoyl chitosan/dodecyl sulfate nanocarrier for a pyrazoline with antileukemic activity. Mater Sci Eng C Mater Biol Appl 2019; 105:110051. [PMID: 31546341 DOI: 10.1016/j.msec.2019.110051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2019] [Revised: 07/18/2019] [Accepted: 08/02/2019] [Indexed: 01/01/2023]
Abstract
We describe herein a chitosan nanocarrier for drug delivery applications obtained through the self-assembly of carboxymethyl-hexanoyl chitosan and dodecyl sulfate (CHC-SDS). Nanocapsules with spherical morphology were obtained in phosphate buffer at pH 7.4. These CHC-SDS nanocapsules showed no toxicity toward Jurkat cells (acute lymphoblastic leukemia) and were used to encapsulate a new pyrazoline (H3TM04) with antileukemia activity. The samples were characterized by dynamic light scattering (DLS) and Laser Doppler Micro-Electrophoresis. The encapsulation efficiency was higher than 96% (293.6 μg mL-1) and the H3TM04-loaded nanocapsules (CHC-SDS-H) had a negative surface charge (-29.8 ± 0.7 mV) and hydrodynamic radius of around 84 nm. For the first time, CHC-SDS-H were formed and the antitumoral cancer activity was proved. The in vitro assays showed the controlled release of H3TM04 from the CHC-SDS-H nanocapsules in phosphate buffer pH 7.4. The H3TM04 release data were described by the power law model, indicating that H3TM04 delivery occurred via an erosion mechanism. The cytotoxicity assays with Jurkat and K-562 cells (acute myeloid leukemia) demonstrated that the CHC-SDS-H nanocapsule decreases the half maximal inhibitory concentration (IC50). The study showed that CHC-SDS nanocapsules represent a promising nanocarrier for pyrazoline derivates that could be applied in leukemia therapy.
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Affiliation(s)
- Andrés Felipe Chamorro Rengifo
- Laboratório de Polímeros e Surfactantes, Departamento de Química, Centro de Ciências Físicas e Matemáticas, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, s/n - Trindade, Florianópolis, SC 88040-900, Brazil.
| | - Natalia Stefanes
- Laboratório de Oncologia Experimental e Hemopatias, Centro de Ciências da Saúde, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, s/n - Trindade, Florianópolis, SC 88040-900, Brazil
| | - Jessica Toigo
- Laboratório de Estrutura e Atividade, Departamento de Química, Centro de Ciências Físicas e Matemáticas, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, s/n - Trindade, Florianópolis, SC 88040-900, Brazil
| | - Cassiana Mendes
- Grupo de Estudo em Materiais Poliméricos, Departamento de Química, Centro de Ciências Físicas e Matemáticas, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, s/n - Trindade, Florianópolis, SC 88040-900, Brazil
| | - Maria C Santos-Silva
- Laboratório de Oncologia Experimental e Hemopatias, Centro de Ciências da Saúde, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, s/n - Trindade, Florianópolis, SC 88040-900, Brazil
| | - Ricardo J Nunes
- Laboratório de Estrutura e Atividade, Departamento de Química, Centro de Ciências Físicas e Matemáticas, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, s/n - Trindade, Florianópolis, SC 88040-900, Brazil
| | - Alexandre Luis Parize
- Grupo de Estudo em Materiais Poliméricos, Departamento de Química, Centro de Ciências Físicas e Matemáticas, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, s/n - Trindade, Florianópolis, SC 88040-900, Brazil
| | - Edson Minatti
- Laboratório de Polímeros e Surfactantes, Departamento de Química, Centro de Ciências Físicas e Matemáticas, Universidade Federal de Santa Catarina, Campus Reitor João David Ferreira Lima, s/n - Trindade, Florianópolis, SC 88040-900, Brazil
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Rengifo AF, Santos SC, de Lima VR, Agudelo AJ, da Silva LH, Parize AL, Minatti E. Aggregation behavior of self-assembled nanoparticles made from carboxymethyl-hexanoyl chitosan and sodium dodecyl sulphate surfactant in water. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.125] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Bellettini IC, Fayad SJ, Machado VG, Minatti E. Properties of polyplexes formed through interaction between hydrophobically-modified poly(ethylene imine)s and calf thymus DNA in aqueous solution. Soft Matter 2017; 13:2609-2619. [PMID: 28327732 DOI: 10.1039/c6sm02835g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Polycationic polymers and DNA form soluble complexes in aqueous solution, which allows the transfer of genetic material into cells. Therefore, these chemically-modified polymers are of interest for use in studies aimed at better transfection efficiency and gene expression along with reduced cytotoxicity. In this study, branched poly(ethylene imine) (PEI) was modified by alkylation with n-alkyl groups (n = 4, 6, 8 and 12 carbons). The polyplexes formed through interaction of the modified PEIs and calf thymus DNA (ctDNA) were investigated using UV-Vis spectrophotometry, ethidium bromide fluorescence emission, circular dichroism spectroscopy, dynamic light scattering, and small-angle X-ray scattering techniques along with the determination of the zeta potential and viscosity. According to the results obtained, the formation of ctDNA-PEI polyplexes occurs in three steps. Firstly, when a small amount of polyelectrolyte is present the ctDNA chains are partially compacted. Subsequently, with the addition of more polyelectrolyte, the complexes have a null charge density and micrometric size. Lastly, with a higher concentration of PEI, the ctDNA is fully compacted by the PEI chains, leading to positively charged complexes with Rh values in the range of 52.0-86.0 nm. The viscosity and SAXS analysis suggested that the unmodified PEI exhibits the strongest interaction and promotes the best ctDNA condensation.
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Affiliation(s)
- I C Bellettini
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianópolis, SC 88040-900, Brazil.
| | - S J Fayad
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianópolis, SC 88040-900, Brazil.
| | - V G Machado
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianópolis, SC 88040-900, Brazil.
| | - E Minatti
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianópolis, SC 88040-900, Brazil.
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Bellettini IC, Witt MA, Borsali R, Minatti E, Rubira AF, Muniz EC. PS-b-PAA nanovesicles coated by modified PEIs bearing hydrophobic and hydrophilic groups. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.01.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Bellettini IC, Eising R, Felippe AC, Domingos JB, Minatti E, Machado VG. ASSOCIATION OF BRANCHED POLYETHYLENE IMINE WITH SURFACTANTS IN AQUEOUS SOLUTION. QUIM NOVA 2015. [DOI: 10.5935/0100-4042.20150085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Fayad SJ, Minatti E, Soldi V, Borsali R. Transition from star-like to crew-cut micelles induced by UV radiation. J Colloid Interface Sci 2014; 416:54-8. [PMID: 24370401 DOI: 10.1016/j.jcis.2013.10.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 10/15/2013] [Accepted: 10/16/2013] [Indexed: 11/18/2022]
Abstract
In the present article, the effect of UV on PS-b-PMMA micelles in solution is discussed. Micellar solutions of the amphiphilic poly(styrene-b-methylmethacrylate) block copolymer in selective solvent (methanol for the PMMA block) were exposed to UV radiation, which has simultaneously led to cross linking of the micellar core (PS) and degradation of the micellar corona (PMMA). The kinetics of such process were investigated in situ by means of dynamic light scattering, allowing the measurement of hydrodynamic radius as a function of UV exposure time. Results indicate that the size of micelles has decreased with UV exposure time down to a minimum value. Such reduced size resulted from PMMA degradation, which later promoted aggregation and coagulation because the micellar core was no longer well protected by PMMA. Addition of good solvent for both blocks (toluene) to non-UV exposed micelles has led to core swelling (PS) and, ultimately, system disassembly (free copolymer chain). The effect of adding toluene on the UV-exposed micelles has only caused core swelling as a consequence of the PS cross-linking.
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Affiliation(s)
- Samira Jamil Fayad
- Centre de Recherches sur les Macromolécules Végétales CERMAV-CNRS), Affiliated with Grenoble Alpes University and Member of the Institut de Chimie Moléculaire de Grenoble, BP 53, F-38041 Grenoble Cedex 9, France; Department of Chemistry, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, Brazil
| | - Edson Minatti
- Department of Chemistry, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, Brazil
| | - Valdir Soldi
- Department of Chemistry, Universidade Federal de Santa Catarina, 88040-900 Florianópolis, Brazil
| | - Redouane Borsali
- Centre de Recherches sur les Macromolécules Végétales CERMAV-CNRS), Affiliated with Grenoble Alpes University and Member of the Institut de Chimie Moléculaire de Grenoble, BP 53, F-38041 Grenoble Cedex 9, France.
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Fayad SJ, Ramos BGZ, Soldi V, Minatti E. NANOPARTICLES FROM SOYBEAN PROTEIN ISOLATE BY COACERVATION IN WATER: EFFECT OF IONIC STRENGTH AND CONCENTRATION OF PROTEIN AND SURFACTANT. QUIM NOVA 2014. [DOI: 10.5935/0100-4042.20140295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Rotta J, Pham PD, Lapinte V, Borsali R, Minatti E, Robin JJ. Synthesis of Amphiphilic Polymers Based on Fatty Acids and Glycerol-Derived Monomers - A Study of Their Self-Assembly in Water. MACROMOL CHEM PHYS 2013. [DOI: 10.1002/macp.201300483] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jefferson Rotta
- Institut Charles Gerhardt Montpellier UMR5253 CNRS-UM2-ENSCM-UM1; Equipe Ingénierie et Architectures Macromoléculaires; Université Montpellier II cc1702; Place Eugène Bataillon 34095 Montpellier Cedex 5 France
- Laboratory of Polymer and Surfactant Solutions; Department of Chemistry; Federal University of Santa Catarina; 88040-900 Florianópolis SC Brazil
| | - Phuoc Dien Pham
- Institut Charles Gerhardt Montpellier UMR5253 CNRS-UM2-ENSCM-UM1; Equipe Ingénierie et Architectures Macromoléculaires; Université Montpellier II cc1702; Place Eugène Bataillon 34095 Montpellier Cedex 5 France
| | - Vincent Lapinte
- Institut Charles Gerhardt Montpellier UMR5253 CNRS-UM2-ENSCM-UM1; Equipe Ingénierie et Architectures Macromoléculaires; Université Montpellier II cc1702; Place Eugène Bataillon 34095 Montpellier Cedex 5 France
| | | | - Edson Minatti
- Laboratory of Polymer and Surfactant Solutions; Department of Chemistry; Federal University of Santa Catarina; 88040-900 Florianópolis SC Brazil
| | - Jean-Jacques Robin
- Institut Charles Gerhardt Montpellier UMR5253 CNRS-UM2-ENSCM-UM1; Equipe Ingénierie et Architectures Macromoléculaires; Université Montpellier II cc1702; Place Eugène Bataillon 34095 Montpellier Cedex 5 France
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Nandi LG, Guerra JPTA, Bellettini IC, Machado VG, Minatti E. Properties of aqueous solutions of lentinan in the absence and presence of zwitterionic surfactants. Carbohydr Polym 2013; 98:1-7. [PMID: 23987310 DOI: 10.1016/j.carbpol.2013.04.053] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2013] [Revised: 04/11/2013] [Accepted: 04/13/2013] [Indexed: 10/26/2022]
Abstract
Morphological and conformational transitions of lentinan (LT), a β-glucan extracted from Shiitake mushrooms (Lentinula edodes), were investigated at different concentrations of aqueous NaOH, using Small Angle X-ray Scattering (SAXS) technique. At low NaOH(aq) concentration LT chains are self-associated and adopt the triple helix form where as at higher NaOH concentrations the polymer chains undergo a transition to random coil chains. Also, the presence of fractal dimensions was observed through analysis of the exponential decay of the scattering intensity as a function of the scattering angle. In addition, the lateral radius of gyration was determined for LT in different concentrations of NaOH solution, indicating a rigid triple helix present as a small rod-like structure. Interactions of LT with two zwitterionic surfactants were investigated by surface tension, fluorescence, and static light scattering measurements. Experimental data showed that the formation of LT-(surfactant) complexes occurred through a cooperative process.
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Affiliation(s)
- Leandro G Nandi
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianópolis, SC 88040-900, Brazil
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Fayad SJ, Zanetti-Ramos BG, Barreto PLM, Soldi V, Minatti E. Morphology of Soy Protein Isolate at Oil/Water and Oil/Air Interfaces. J BRAZIL CHEM SOC 2013. [DOI: 10.5935/0103-5053.20130130] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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de Medeiros Modolon S, Otsuka I, Fort S, Minatti E, Borsali R, Halila S. Sweet block copolymer nanoparticles: preparation and self-assembly of fully oligosaccharide-based amphiphile. Biomacromolecules 2012; 13:1129-35. [PMID: 22397388 DOI: 10.1021/bm3000138] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The preparation of biocompatible nanocarriers that have potential applications in the cosmetic and health industries is highly desired. The self-assembly of amphiphilic block copolymers displaying biosourced polysaccharides at the surface is one of the most promising approaches. In the continuity of our works related to the preparation of "hybrid" amphiphilic oligosaccharide-based block copolymers, we present here the design of a new generation of self-assembled nanoparticles composed entirely of oligosaccharide-based amphiphilic block co-oligomers (BCO). These systems are defined by a covalent linkage of the two saccharidic blocks through their reducing end units, resulting in a sweet "head-to-head" connection. As an example, we have prepared and studied a BCO in which the hydrophilic part is composed of a free maltoheptaosyl derivative clicked to a hydrophobic part composed of a peracetylated maltoheptaosyl derivative. This amphiphilic BCO self-assembles to form spherical micelles in water with an average diameter of 30 nm. The efficient enzymatic hydrolysis of the maltoheptaose that constitutes the shell of the micelles was followed by light scattering and colorimetric methods.
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Affiliation(s)
- Samuel de Medeiros Modolon
- Centre de Recherches sur les Macromolécules Végétales, CERMAV-CNRS (Affiliated with Université Joseph Fourier, and member of the Institut de Chimie Moléculaire de Grenoble), Grenoble, France
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Bellettini IC, Nandi LG, Eising R, Domingos JB, Machado VG, Minatti E. Properties of aqueous solutions of hydrophobically modified polyethylene imines in the absence and presence of sodium dodecylsulfate. J Colloid Interface Sci 2011; 370:94-101. [PMID: 22257961 DOI: 10.1016/j.jcis.2011.12.049] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Revised: 12/16/2011] [Accepted: 12/16/2011] [Indexed: 11/28/2022]
Abstract
Four modified hyperbranched polyethylene imines (PEIs) were synthesized by means of the alkylation of PEI. SAXS, viscosity, surface tension, and pyrene fluorescence emission were then used as techniques to examine the conformation and aggregation of the modified PEIs in aqueous solution, in the absence and presence of sodium dodecylsulfate (SDS). Analysis of the SAXS data showed that the radius of gyration decreases with an increase in the alkyl chain length of the polymer, while the viscosity data indicated a decrease in the intrinsic viscosity under the same conditions. The nonmodified PEI was not surface active, while the hydrophobically modified samples showed pronounced surface activity and the presence of hydrophobic domains. On addition of SDS, the onset of the formation of polymer-surfactant complexes was determined, indicating a decrease in the critical aggregate concentration with an increase in the alkyl chain length of the polymer backbone.
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Affiliation(s)
- Ismael C Bellettini
- Departamento de Química, Universidade Federal de Santa Catarina, UFSC, Florianópolis, SC 88040-900, Brazil
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Felippe AC, Bellettini IC, Eising R, Minatti E, Giacomelli FC. Supramolecular complexes formed by the association of poly(ethyleneimine) (PEI), sodium cholate (NaC) and sodium dodecyl sulfate (SDS). J BRAZIL CHEM SOC 2011. [DOI: 10.1590/s0103-50532011000800019] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Rotta J, Minatti E, Barreto PLM. Determination of structural and mechanical properties, diffractometry, and thermal analysis of chitosan and hydroxypropylmethylcellulose (HPMC) films plasticized with sorbitol. Ciênc Tecnol Aliment 2011. [DOI: 10.1590/s0101-20612011000200026] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Dal-Bó AG, Laus R, Felippe AC, Zanette D, Minatti E. Association of anionic surfactant mixed micelles with hydrophobically modified ethyl(hydroxyethyl)cellulose. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.02.028] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Mazzarino L, Bellettini IC, Minatti E, Lemos-Senna E. Development and validation of a fluorimetric method to determine curcumin in lipid and polymeric nanocapsule suspensions. BRAZ J PHARM SCI 2010. [DOI: 10.1590/s1984-82502010000200008] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A simple, rapid, and sensitive fluorimetric method was developed and validated to quantify curcumin in lipid and polymeric nanocapsule suspensions, using acetonitrile as a solvent. The excitation and emission wavelengths were set at 397 nm and 508 nm, respectively. The calibration graph was linear from 0.1 to 0.6 µg/mL with a correlation coefficient of 0.9982. The detection and quantitation limits were 0.03 and 0.10 µg/mL, respectively. The validation results confirmed that the developed method is specific, linear, accurate, and precise for its intended use. The current method was successfully applied to the evaluation of curcumin content in lipid and polymeric nanocapsule suspensions during the early stage of formulation development.
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Modolon SDM, Dal Bó AG, Felippe AC, Minatti E, Zanette D. Auto-associação do dodecilsulfato de sódio (SDS) com o polímero hidrofobicamente modificado etil(hidroxietil) celulose (EHEC). QUIM NOVA 2009. [DOI: 10.1590/s0100-40422009000800012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Schweitzer B, Felippe AC, Dal Bó A, Minatti E, Zanette D, Lopes A. Sodium dodecyl sulfate promoting a cooperative association process of sodium cholate with bovine serum albumin. J Colloid Interface Sci 2006; 298:457-66. [PMID: 16457837 DOI: 10.1016/j.jcis.2005.12.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2005] [Revised: 12/13/2005] [Accepted: 12/13/2005] [Indexed: 11/17/2022]
Abstract
Sodium cholate (NaC) was used as a representative bile salt in the process of cooperative binding to bovine serum albumin (BSA) in a mixture with sodium dodecyl sulfate (SDS). The experiments were performed in 0.02 M Tris-HCl buffer solution (pH 7.50), in the presence of 0.1% BSA and at 25 degrees C. The aim of this study is to provide information on the performance of the BSA in the promotion of cooperative binding of sodium cholate promoted by the presence of SDS. The method used to monitor the binding was based on the analysis of the effect of SDS and NaC concentrations and their mixtures upon the fluorescence intensity of the BSA tryptophan residues. Plots of the fluorescence emission bands in terms of the A0/A ratio vs surfactant concentrations, where A0 and A represent the areas of emission bands in the presence and absence of the surfactants, respectively, were drawn in order to investigate the surfactant interaction with the protein. An alternative methodology, the specific conductivity vs surfactant concentration plots, was used, which involves mixtures of SDS and NaC to investigate the association processes, through the determination of the critical aggregation concentration (cac, when in the presence of protein) and the critical micellar concentration (cmc). The results led to a general conclusion that as the mixed micellar aggregates become richer in the bile salt monomer, the tendency to lose the reactivity with the protein increases. According to our results, a clear evidence of the predomination of BSA-SDS-NaC complexes is found only for the SDS molar fraction above approximately 0.6, and below this fraction a tendency toward free mixed micelles starts to predominate.
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Affiliation(s)
- Bianca Schweitzer
- Departamento de Química da Universidade Federal de Santa Catarina, CEP: 88040-900, Florianópolis, SC, Brazil
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Schweitzer B, Felippe AC, Dal Bó A, Minatti E, Zanette D. Competitive Process of Binding Between the Anionic Surfactants Sodium Dodecyl Sulfate and Sodium Cholate in Bovine Serum Albumin. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/masy.200551126] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Ouarti N, Viville P, Lazzaroni R, Minatti E, Schappacher M, Deffieux A, Putaux JL, Borsali R. Micellar aggregation in blends of linear and cyclic poly(styrene-b-isoprene) diblock copolymers. Langmuir 2005; 21:9085-90. [PMID: 16171336 DOI: 10.1021/la050935z] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The morphology of micelles formed from blends of linear and cyclic poly(styrene-b-isoprene) (PS-b-PI) block copolymers has been investigated in solution using dynamic light scattering (DLS) and in thin solid deposits by atomic force microscopy (AFM) and transmission electron microscopy under cryogenic conditions (cryo-TEM). Micelles of the pure cyclic PS(290)-b-PI(110) copolymers are wormlike cylindrical objects built by unidirectional aggregation of 33 nm wide sunflower micelles, while the linear block copolymer having the same volume fraction and molar mass forms spherical micelles 40 nm in diameter. The DLS, AFM, and cryo-TEM results consistently show that the addition of the linear copolymer (even for amounts as low as 5% w/w) to the cyclic copolymer rather favors the formation of spherical micelles at the expense of the cylindrical aggregates. Those results clearly show that the linear block copolymer chains can be used to stabilize the thermodynamically unstable elementary sunflower micelle. The thermal stability of the micelles (from the pure copolymers and from the blends) has been examined in solid deposits with in situ AFM measurements. Coalescence starts at about 70 degrees C, and the surface roughness shows a two-step decrease toward a fully homogeneous and flat structure.
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Affiliation(s)
- Nadia Ouarti
- Service de Chimie des Matériaux Nouveaux, Université de Mons-Hainaut/Materia Nova, 20 Place du Parc, 7000 Mons, Belgium.
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Putauz JL, Minatti E, Lefebvre C, Borsali R, Schappacher M, Deffieux A. Vesicles made of PS-PI cyclic diblock copolymers: in situ freeze-drying cryo-TEM and dynamic light scattering experiments. Faraday Discuss 2005; 128:163-78. [PMID: 15658773 DOI: 10.1039/b403157a] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have studied the morphology of self-assembled micelles made of linear and cyclic poly(styrene-b-isoprene) PS-b-PI block copolymers dispersed in selective solvents of the PI block (n-heptane, n-decane). Up to a copolymer concentration of 5 mg mL(-1), the micelles made from linear block copolymer chains adopt a spherical shape. Those arising from cyclic copolymer chains having exactly the same molar mass and volume fraction self-assemble into (i) planar sunflower-shaped particles at low concentration (c < 0.1 mg mL(-1)), (ii) giant wormlike micelles at intermediate concentration (0.1 mg mL(-1) < c < 2 mg mL(-1)) and (iii) vesicles at higher concentration (2 mg mL(-1) < c < 5 mg mL(-1)). Those results were obtained using dynamic light scattering and in situ freeze-drying cryo-transmission electron microscopy. In this contribution, we discuss the effects of concentration and temperature on the morphology of the self-assembled particles made from both linear and cyclic PS-PI copolymers, and highlight the surprising vesicle formation in cyclic block copolymer solutions.
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Affiliation(s)
- Jean-Luc Putauz
- Laboratoire de Chimie des Polymères Organiques, LCPO-CNRS, UMR 5629, ENSCPB and Bordeaux University I, Pessac, France
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Ouarti N, Viville P, Lazzaroni R, Minatti E, Schappacher M, Deffieux A, Borsali R. Control of the morphology of linear and cyclic PS-b-PI block copolymer micelles via PS addition. Langmuir 2005; 21:1180-1186. [PMID: 15697258 DOI: 10.1021/la048944f] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We have studied the effect of polystyrene (PS) homopolymer addition on the morphology of self-assembled block copolymer micelles made from linear or cyclic poly(styrene-b-isoprene), PS-b-PI, in a selective solvent for the PI block (heptane). Both copolymers have the same composition: the degree of polymerization is 290 for the PS block, and 110 for the PI block, and we focused on the influence of the addition of small amounts of PS homopolymer on the micellar morphology. For the copolymer concentrations considered, the linear copolymer self-organizes into spherical micelles while the cyclic copolymer forms cylindrical micelles. PS and PI chains constitute the core and the corona of these micelles, respectively, due to the different affinity of the blocks for heptane. Consequently, the PS homopolymer added is "solubilized" into the micellar core. Dynamic light scattering (DLS) data combined with atomic force microscopy (AFM) results show that the addition of PS homopolymer induces a drastic change in the micellar organization. Indeed, a morphological transition, from spheres to cylinders for the linear copolymer, and from cylinders to vesicles for the cyclic copolymer, is observed. These results highlight the fact that a small incorporation of PS homopolymer is clearly sufficient to modify the morphology (size and shape) of the micelles. This approach could be a key parameter for the design/control of micelles for specific applications in nanotechnology.
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Affiliation(s)
- Nadia Ouarti
- Laboratoire de Chimie des Polymères Organiques, CNRS, ENSCPB and Bordeaux-1 University, 16 Avenue Pey Berland 33607 PESSAC CEDEX, France.
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25
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Minatti E, Viville P, Borsali R, Schappacher M, Deffieux A, Lazzaroni R. Micellar Morphological Changes Promoted by Cyclization of PS-b-PI Copolymer: DLS and AFM Experiments. Macromolecules 2003. [DOI: 10.1021/ma020927e] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- E. Minatti
- Laboratoire de Chimie des Polymères Organiques, LCPO-CNRS, ENSCPB and Bordeaux-1 University, 16 Avenue Pey Berland 33607 Pessac Cedex, France, Departamento de Química da Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil, and Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Sciences des Matériaux Polymères (CRESMAP), 20, Place du Parc, 7000 Mons, Belgium
| | - P. Viville
- Laboratoire de Chimie des Polymères Organiques, LCPO-CNRS, ENSCPB and Bordeaux-1 University, 16 Avenue Pey Berland 33607 Pessac Cedex, France, Departamento de Química da Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil, and Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Sciences des Matériaux Polymères (CRESMAP), 20, Place du Parc, 7000 Mons, Belgium
| | - R. Borsali
- Laboratoire de Chimie des Polymères Organiques, LCPO-CNRS, ENSCPB and Bordeaux-1 University, 16 Avenue Pey Berland 33607 Pessac Cedex, France, Departamento de Química da Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil, and Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Sciences des Matériaux Polymères (CRESMAP), 20, Place du Parc, 7000 Mons, Belgium
| | - M. Schappacher
- Laboratoire de Chimie des Polymères Organiques, LCPO-CNRS, ENSCPB and Bordeaux-1 University, 16 Avenue Pey Berland 33607 Pessac Cedex, France, Departamento de Química da Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil, and Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Sciences des Matériaux Polymères (CRESMAP), 20, Place du Parc, 7000 Mons, Belgium
| | - A. Deffieux
- Laboratoire de Chimie des Polymères Organiques, LCPO-CNRS, ENSCPB and Bordeaux-1 University, 16 Avenue Pey Berland 33607 Pessac Cedex, France, Departamento de Química da Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil, and Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Sciences des Matériaux Polymères (CRESMAP), 20, Place du Parc, 7000 Mons, Belgium
| | - R. Lazzaroni
- Laboratoire de Chimie des Polymères Organiques, LCPO-CNRS, ENSCPB and Bordeaux-1 University, 16 Avenue Pey Berland 33607 Pessac Cedex, France, Departamento de Química da Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil, and Service de Chimie des Matériaux Nouveaux, Centre de Recherche en Sciences des Matériaux Polymères (CRESMAP), 20, Place du Parc, 7000 Mons, Belgium
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Minatti E, Borsali R, Schappacher M, Deffieux A, Soldi V, Narayanan T, Putaux JL. Effect of Cyclization of Polystyrene/Polyisoprene Block Copolymers on Their Micellar Morphology. Macromol Rapid Commun 2002. [DOI: 10.1002/1521-3927(200211)23:16<978::aid-marc978>3.0.co;2-k] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Ruzza AA, Froehner SJ, Minatti E, Nome F, Zanette D. Quantitative Treatment of Ketal Hydrolysis in Aqueous Solutions Containing Polymer-Surfactant Complexes Using a Pseudophase Kinetic Model. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100098a034] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Affiliation(s)
- David P. Norwood
- Department of Physics, Tulane University, New Orleans, Louisiana 70118
| | - Edson Minatti
- Department of Physics, Tulane University, New Orleans, Louisiana 70118
| | - Wayne F. Reed
- Department of Physics, Tulane University, New Orleans, Louisiana 70118
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Affiliation(s)
- Edson Minatti
- Department of Physics, Tulane University, New Orleans, Louisiana 70118
| | - David P. Norwood
- Department of Physics, Tulane University, New Orleans, Louisiana 70118
| | - Wayne F. Reed
- Department of Physics, Tulane University, New Orleans, Louisiana 70118
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Minatti E, Zanette D. Salt effects on the interaction of poly(ethylene oxide) and sodium dodecyl sulfate measured by conductivity. Colloids Surf A Physicochem Eng Asp 1996. [DOI: 10.1016/0927-7757(96)03573-x] [Citation(s) in RCA: 121] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Zanette D, Ruzza ÂA, Froehner SJ, Minatti E. Polymer-surfactant interactions demonstrated by a kinetic probe: degree of ionization. Colloids Surf A Physicochem Eng Asp 1996. [DOI: 10.1016/0927-7757(95)03355-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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