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Li H, Cui C, Cao X, Yuan F, Xu Z, Zhang L, Zhang L. The Interfacial Dilational Rheology Properties of Betaine Solutions: Effect of Anionic Surfactant and Polymer. Molecules 2023; 28:5436. [PMID: 37513308 PMCID: PMC10384304 DOI: 10.3390/molecules28145436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 07/08/2023] [Accepted: 07/14/2023] [Indexed: 07/30/2023] Open
Abstract
Interfacial dilational rheology is one of the important means to explore the interfacial properties of adsorption films. In this paper, the interfacial rheological properties of the mixed system of sulfobetaine ASB with a linear alkyl group and two anionic surfactants, petroleum sulfonate (PS) and alkyl polyoxyethylene carboxylate (AEC), were investigated by interfacial dilational rheology. The effect of the introduction of polymer hydrophobically modified polyacrylamide (HMPAM) on the interfacial properties of the mixed system was analyzed. In this experiment, the surfactant solution was used as the external phase and n-decane was used as the internal phase. A periodic sinusoidal disturbance of 0.1 Hz was applied to the n-decane droplets, and the changes of parameters such as droplet interfacial tension and interfacial area were monitored in real time with the help of a computer. The results show that the betaine ASB molecule responds to the dilation and compression of the interface through the change of ion head orientation, while the feedback behavior of petroleum sulfonate PS and AEC molecules embedded with oxygen vinyl groups in the molecule is diffusion and exchange between the interface and the bulk phase. Therefore, the interface film formed by ASB alone is higher, and the film formed by PS and AEC molecules alone is relatively lower. After adding two kinds of anionic surfactants to the betaine system, the ionic head of PS or AEC molecules will be attached to the positive center of the hydrophilic group of ASB molecules by electrostatic attraction and no longer adsorb and desorb with the interface deformation. The interfacial rheological properties of the compound system are still dominated by betaine, with higher dilational modulus and lower phase angle. When a small amount of HMPAM is added, or the content of hydrophobic monomer AMPS in the bulk phase is low, the intermolecular interaction at the interface is enhanced, the slow relaxation process is intensified, and the interfacial film strength is increased. As the content of AMPS further increases, hydrophobic blocks and surfactant molecules will form interfacial aggregates similar to mixed micelles at the oil-water interface, which will regulate the properties of the film by affecting the adsorption of surfactants at the interface. As long as the interfacial tension is the same, the properties of the interfacial film are the same. Based on the colloid interface science and the background of enhanced oil recovery, this study provides a reference for the field application of chemical flooding formulations.
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Affiliation(s)
- Haitao Li
- School of petroleum engineering, China University of Petroleum (East China), Qingdao 266580, China
- Exploration & Development Research Institute of Shengli Oilfield Co., Ltd., SINOPEC, Dongying 257015, China
| | - Chuanzhi Cui
- School of petroleum engineering, China University of Petroleum (East China), Qingdao 266580, China
| | - Xulong Cao
- Exploration & Development Research Institute of Shengli Oilfield Co., Ltd., SINOPEC, Dongying 257015, China
| | - Fuqing Yuan
- Exploration & Development Research Institute of Shengli Oilfield Co., Ltd., SINOPEC, Dongying 257015, China
| | - Zhicheng Xu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Lei Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Lu Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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Zhang Z, Bolshakov A, Han J, Zhu J, Yang KL. Electrospun Core-Sheath Fibers with a Uniformly Aligned Polymer Network Liquid Crystal (PNLC). ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 36916499 DOI: 10.1021/acsami.2c23065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Electrospun polymer-liquid crystal (PLC) fibers have potential applications such as wearable sensors and adaptive textiles because of their rapid response and high flexibility. However, existing PLC fibers only have a narrow responsive range and poor resistance to heat and chemicals. Herein, a new type of PLC fiber is prepared by using a coaxial electrospinning process. The core solution is 4'-pentyl-4-biphenylcarbonitrile (5CB), and the sheath solution is a mixture containing 13 wt % PVP and 10 wt % reactive mesogen (RM). After UV exposure of the fibers, 5CB in the core and RM diffusing from the core are cross-linked into an LC polymer. The fibers have a highly uniform morphology with an average diameter of 3.2 ± 0.5 μm, and mesogens inside the fibers align unidirectionally with the long axis of the fibers. The fibers show a broad phase-transition temperature range between 13.5 and 155.5 °C and have a response time of less than 10 s. The temperature range can also be controlled by adjusting components in the electrospun fibers and UV exposure time. The core-sheath fibers prepared in such a manner exhibit excellent heat and chemical resistance with reversible optical responses. Moreover, when the fibers are exposed to volatile organic compounds (VOCs) such as toluene, the fibers show a rapid optical response to toluene vapor within 25 s. This study demonstrates that the fibers are potentially useful for preparing flexible temperature and chemical sensors.
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Affiliation(s)
- Zhibo Zhang
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, P. R. China
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117576 Singapore, Singapore
| | - Andrey Bolshakov
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, P. R. China
| | - Jiecai Han
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, P. R. China
| | - Jiaqi Zhu
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, P. R. China
| | - Kun-Lin Yang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117576 Singapore, Singapore
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Effects of extenders and cryoprotectants on cryopreservation of Thai red junglefowl (Gallus gallus gallus) spermatozoa. Cryobiology 2022; 106:48-54. [DOI: 10.1016/j.cryobiol.2022.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 04/12/2022] [Accepted: 04/19/2022] [Indexed: 11/17/2022]
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Qazi MJ, Schlegel SJ, Backus EH, Bonn M, Bonn D, Shahidzadeh N. Dynamic Surface Tension of Surfactants in the Presence of High Salt Concentrations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:7956-7964. [PMID: 32545966 PMCID: PMC7366510 DOI: 10.1021/acs.langmuir.0c01211] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Revised: 06/16/2020] [Indexed: 05/21/2023]
Abstract
We study the influence of high NaCl concentrations on the equilibrium and dynamic surface tensions of ionic (CTAB) and nonionic (Tween 80) surfactant solutions. Equilibrium surface tension measurements show that NaCl significantly reduces the critical micellar concentration (CMC) of CTAB but has no effect on the CMC of Tween 80. Dynamic surface tension measurements allow comparing the surface tension as a function of time for pure surfactant solutions and in the presence of NaCl. For the ionic surfactant, the dynamics agree with the usual diffusion-limited interfacial adsorption kinetics; however, the kinetics become orders of magnitude slower when NaCl is present. Sum-frequency generation spectroscopy experiments and the equilibrium adsorption measurements show that the presence of NaCl in CTAB solution leads to the formation of ion pairs at the surface, thereby neutralizing the charge of the head group of CTAB. This change, however, is not able to account for the slowing down of adsorption dynamics; we find that it is rather the decreases in the monomer concentration (CMC) in the presence of salt which has the major influence. For the nonionic surfactant, the kinetics of interfacial tension is seen to be already very slow, and the addition of salt does not influence it further. This also correlates very well to the very low CMC of Tween 80.
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Affiliation(s)
- Mohsin J. Qazi
- Institute
of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Simon J. Schlegel
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Ellen H.G. Backus
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Physical Chemistry, University of Vienna, Währinger Straße 42, 1090 Vienna, Austria
| | - Mischa Bonn
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Daniel Bonn
- Institute
of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Noushine Shahidzadeh
- Institute
of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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Association behaviors of poly(N-vinylpyrrolidone)-grafted fullerenes in aqueous solution. JOURNAL OF POLYMER RESEARCH 2018. [DOI: 10.1007/s10965-018-1604-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Rakha BA, Ansari MS, Akhter S, Zafar Z, Hussain I, Santiago-Moreno J, Blesbois E. Cryopreservation of Indian red jungle fowl ( Gallus gallus murghi ) semen with polyvinylpyrrolidone. Cryobiology 2017; 78:27-33. [DOI: 10.1016/j.cryobiol.2017.07.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2017] [Revised: 07/14/2017] [Accepted: 07/14/2017] [Indexed: 11/25/2022]
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Noskov BA, Krycki MM. Formation of protein/surfactant adsorption layer as studied by dilational surface rheology. Adv Colloid Interface Sci 2017; 247:81-99. [PMID: 28716186 DOI: 10.1016/j.cis.2017.07.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 06/19/2017] [Accepted: 07/02/2017] [Indexed: 12/25/2022]
Abstract
The review discusses the mechanism of formation of protein/surfactant adsorption layers at the liquid - gas interface. The complexes of globular proteins usually preserve their compact structure a low surfactant concentrations. Therefore a simple kinetic model of the adsorption of charged compact nanoparticles is discussed first and compared with experimental data. The increase of surfactant concentrations results in various conformational transitions in the surface layer. One can obtain information on the changes of the adsorption layer structure using the dilational surface rheology. The kinetic dependencies of the dynamic surface elasticity are strongly different for the adsorption of unfolded macromolecules and compact globules, and have local maxima in the former case corresponding to different steps of the adsorption. These distinctions allow tracing the changes of the tertiary structure of protein/surfactant complexes in the surface layer. The adsorption from mixed solutions of ionic surfactants with β-casein, β-lactoglobulin, bovine serum albumin and myoglobin is discussed with some details.
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Yu K, Zhang H, Hodges C, Biggs S, Xu Z, Cayre OJ, Harbottle D. Foaming Behavior of Polymer-Coated Colloids: The Need for Thick Liquid Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:6528-6539. [PMID: 28594563 DOI: 10.1021/acs.langmuir.7b00723] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The current study examined the foaming behavior of poly(vinylpyrrolidone) (PVP)-silica composite nanoparticles. Individually, the two components, PVP and silica nanoparticles, exhibited very little potential to partition at the air-water interface, and as such, stable foams could not be generated. In contrast, combining the two components to form silica-PVP core-shell nanocomposites led to good "foamability" and long-term foam stability. Addition of an electrolyte (Na2SO4) was shown to have a marked effect on the foam stability. By varying the concentration of electrolyte between 0 and 0.55 M, three regions of foam stability were observed: rapid foam collapse at low electrolyte concentrations, delayed foam collapse at intermediate concentrations, and long-term stability (∼10 days) at the highest electrolyte concentration. The observed transitions in foam stability were better understood by studying the microstructure and physical and mechanical properties of the particle-laden interface. For rapidly collapsing foams the nanocomposite particles were weakly retained at the air-water interface. The interfaces in this case were characterized as being "liquid-like" and the foams collapsed within 100 min. At an intermediate electrolyte concentration (0.1 M), delayed foam collapse over ∼16 h was observed. The particle-laden interface was shown to be pseudo-solid-like as measured under shear and compression. The increased interfacial rigidity was attributed to adhesion between interpenetrating polymer layers. For the most stable foam (prepared in 0.55 M Na2SO4), the ratio of the viscoelastic moduli, G'/G″, was found to be equal to ∼3, confirming a strongly elastic interfacial layer. Using optical microscopy, enhanced foam stability was assessed and attributed to a change in the mechanism of foam collapse. Bubble-bubble coalescence was found to be significantly retarded by the aggregation of nanocomposite particles, with the long-term destabilization being recognized to result from bubble coarsening. For rapidly destabilizing foams, the contribution from bubble-bubble coalescence was shown to be more significant.
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Affiliation(s)
- Kai Yu
- School of Chemical and Process Engineering, University of Leeds , Leeds, U.K
| | - Huagui Zhang
- School of Chemical and Process Engineering, University of Leeds , Leeds, U.K
| | - Chris Hodges
- School of Chemical and Process Engineering, University of Leeds , Leeds, U.K
| | - Simon Biggs
- Faculty of Engineering, Architecture and Information Technology, The University of Queensland , St. Lucia, QLD, Australia
| | - Zhenghe Xu
- Department of Chemical and Materials Engineering, University of Alberta , Edmonton, AB, Canada
| | - Olivier J Cayre
- School of Chemical and Process Engineering, University of Leeds , Leeds, U.K
| | - David Harbottle
- School of Chemical and Process Engineering, University of Leeds , Leeds, U.K
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Kim MS, Lee TK, Lee DH. Directed assembly of suspended nanowires assisted by topographically patterned surfaces of n-paraffin. Macromol Res 2015. [DOI: 10.1007/s13233-015-3103-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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11
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Noskov BA, Bykov AG. Dilational surface rheology of polymer solutions. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4518] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Meier R, Thommes M, Rasenack N, Krumme M, Moll KP, Kleinebudde P. Simplified formulations with high drug loads for continuous twin-screw granulation. Int J Pharm 2015; 496:12-23. [PMID: 26024821 DOI: 10.1016/j.ijpharm.2015.05.060] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Revised: 05/19/2015] [Accepted: 05/23/2015] [Indexed: 10/23/2022]
Abstract
As different batches of the same excipients will be intermixed during continuous processes, the traceability of batches is complicated. Simplified formulations may help to reduce problems related to batch intermixing and traceability. Twin-screw granulation with subsequent tableting was used to produce granules and tablets, containing drug, disintegrant and binder (binary and ternary mixtures), only. Drug loads up to 90% were achieved and five different disintegrants were screened for keeping their disintegration suitability after wetting. Granule size distributions were consistently mono-modal and narrow. Granule strength reached higher values, using ternary mixtures. Tablets containing croscarmellose-Na as disintegrant displayed tensile strengths up to 3.1MPa and disintegration times from 400 to 466s, resulting in the most robust disintegrant. Dissolution was overall complete and above 96% within 30 min. Na-starch glycolate offers tensile strengths up to 2.8MPa at disintegration times from 25s to 1031s, providing the broadest application window, as it corresponds in some parts to different definitions of orodispersible tablets. Tablets containing micronized crospovidone are not suitable for immediate release, but showed possibilities to produce highly drug loaded, prolonged release tablets. Tablets and granules from simplified formulations offer great opportunities to improve continuous processes, present performances comparable to more complicated formulations and are able to correspond to requirements of the authorities.
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Affiliation(s)
- R Meier
- Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine-University, Universitaetsstr. 1, 40225 Duesseldorf, Germany.
| | - M Thommes
- Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine-University, Universitaetsstr. 1, 40225 Duesseldorf, Germany; Faculty of Bio- and Chemical Engineering, Technical University Dortmund, Emil-Figge-Str. 68, 44227 Dortmund, Germany.
| | | | - M Krumme
- Novartis AG, 4002 Basel, Switzerland.
| | - K-P Moll
- Novartis AG, 4002 Basel, Switzerland.
| | - P Kleinebudde
- Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine-University, Universitaetsstr. 1, 40225 Duesseldorf, Germany.
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Posteraro D, Ivall J, Maric M, Servio P. New insights into the effect of polyvinylpyrrolidone (PVP) concentration on methane hydrate growth. 2. Liquid phase methane mole fraction. Chem Eng Sci 2015. [DOI: 10.1016/j.ces.2014.12.008] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Pinaud F, Geisel K, Massé P, Catargi B, Isa L, Richtering W, Ravaine V, Schmitt V. Adsorption of microgels at an oil-water interface: correlation between packing and 2D elasticity. SOFT MATTER 2014; 10:6963-6974. [PMID: 24825608 DOI: 10.1039/c4sm00562g] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The aim of this paper is to determine how microgels adsorb at a model oil-water interface and how they adapt their conformation to compression, which gives rise to surface elasticity depending on the microgel packing. The structure of the film is determined by the Langmuir films approach (forced compression) and compared to spontaneous adsorption using the pendant drop method. The behaviour of microgels differs significantly from that of non-deformable particles but resembles that of linear polymers or proteins. We also correlate the properties of microgels spontaneously adsorbed at model interfaces to their forced adsorption during emulsification. Finally we propose a route to easily control a posteriori the microgel packing at the surface of droplets and the flow properties of emulsions stabilised by the microgels.
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Affiliation(s)
- Florent Pinaud
- Université de Bordeaux, Institut des Sciences Moléculaires, ENSCBP, 16 Av. Pey Berland, 33607 Pessac Cedex, France.
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Huang T, Cao C, Liu ZL, Li Y, Du FP. Interaction of pepsin-[C16mim]Br system: interfacial dilational rheology and conformational studies. SOFT MATTER 2014; 10:6810-6819. [PMID: 25079107 DOI: 10.1039/c4sm00950a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The interfacial rheological property is closely related to the stabilities of foams and emulsions, yet there have been limited studies on the interaction between proteins with ionic liquid-type imidazolium surfactants at the decane-water interface as well as in the bulk. Herein, we investigated the interfacial and bulk properties of pepsin (PEP) and an ionic liquid (IL), 1-hexadecyl-3-methylimidazolium bromide, [C(16)mim]Br. The interfacial pressure and dilational rheology studies were performed to describe the formation of [C(16)mim]Br-pepsin complexes. The influence of the oscillating frequency and the bulk concentration of [C(16)mim]Br on the dilational properties were explored. The conformational changes were studied by monitoring the fluorescence and far UV-CD spectra. The results reveal that the globular structure of pepsin is one of the decisive factors controlling the nature of the interfacial film. The monotonous increase in the dilational elastic modulus of pepsin-[C(16)mim]Br solutions with the surface age indicates that no loops and tails had formed. Interestingly, with an increase in the concentration of [C(16)mim]Br, the εd-c curve first passes through a plateau value due to steric hindrance and the electrostatic barrier of already absorbed tenacious pepsin-[C(16)mim]Br complexes. With the further addition of [C(16)mim]Br, the remarkable decrease in dilational elastic modulus indicates that the compact structure is destroyed gradually. The results of the fluorescence spectra and far UV-CD spectra confirm that [C(16)mim]Br did not produce perceptible changes in pepsin at the concentrations studied in the dilational experiment. Possible schematic programs of the pepsin-[C(16)mim]Br interaction model at the interface and in bulk phase are proposed.
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Affiliation(s)
- Tian Huang
- Department of Applied Chemistry, College of Science, China Agricultural University, Beijing, P. R. China.
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Cao C, Huang T, Du FP. Impact of ionic liquid-type imidazolium surfactant additions on dynamic properties of β-casein adsorption layer. Food Hydrocoll 2014. [DOI: 10.1016/j.foodhyd.2013.08.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Protein conformational transitions at the liquid-gas interface as studied by dilational surface rheology. Adv Colloid Interface Sci 2014; 206:222-38. [PMID: 24238394 DOI: 10.1016/j.cis.2013.10.024] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2013] [Revised: 10/21/2013] [Accepted: 10/21/2013] [Indexed: 11/21/2022]
Abstract
Experimental results on the dynamic dilational surface elasticity of protein solutions are analyzed and compared. Short reviews of the protein behavior at the liquid-gas interface and the dilational surface rheology precede the main sections of this work. The kinetic dependencies of the surface elasticity differ strongly for the solutions of globular and non-globular proteins. In the latter case these dependencies are similar to those for solutions of non-ionic amphiphilic polymers and have local maxima corresponding to the formation of the distal region of the surface layer (type I). In the former case the dynamic surface elasticity is much higher (>60 mN/m) and the kinetic dependencies are monotonical and similar to the data for aqueous dispersions of solid nanoparticles (type II). The addition of strong denaturants to solutions of bovine serum albumin and β-lactoglobulin results in an abrupt transition from the type II to type I dependencies if the denaturant concentration exceeds a certain critical value. These results give a strong argument in favor of the preservation of the protein globular structure in the course of adsorption without any denaturants. The addition of cationic surfactants also can lead to the non-monotonical kinetic dependencies of the dynamic surface elasticity indicating destruction of the protein tertiary and secondary structures. The addition of anionic surfactants gives similar results only for the protein solutions of high ionic strength. The influence of cationic surfactants on the local maxima of the kinetic dependencies of the dynamic surface elasticity for solutions of a non-globular protein (β-casein) differs from the influence of anionic surfactants due to the heterogeneity of the charge distribution along the protein chain. In this case one can use small admixtures of ionic surfactants as probes of the adsorption mechanism. The effect of polyelectrolytes on the kinetic dependencies of the dynamic surface elasticity of protein solutions is weaker than the effect of conventional surfactants but exceeds the error limits.
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Yazhgur PA, Akent’ev AV, Bilibin AY, Zorin IM, Noskov BA. Dynamic surface properties of sodium N-acryloyl-11-amimoundecanoate and poly(sodium N-acryloyl-11-aminoundecanoate). COLLOID JOURNAL 2012. [DOI: 10.1134/s1061933x1206018x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Gong H, Xu G, Liu T, Xu L, Zhai X, Zhang J, Lv X. Aggregation behaviors of PEO-PPO-ph-PPO-PEO and PPO-PEO-ph-PEO-PPO at an air/water interface: experimental study and molecular dynamics simulation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:13590-13600. [PMID: 22954368 DOI: 10.1021/la303430c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The block polyethers PEO-PPO-ph-PPO-PEO (BPE) and PPO-PEO-ph-PEO-PPO (BEP) are synthesized by anionic polymerization using bisphenol A as initiator. Compared with Pluronic P123, the aggregation behaviors of BPE and BEP at an air/water interface are investigated by the surface tension and dilational viscoelasticity. The molecular construction can influence the efficiency and effectiveness of block polyethers in decreasing surface tension. BPE has the most efficient ability to decrease surface tension of water among the three block polyethers. The maximum surface excess concentration (Γ(max)) of BPE is larger than that of BEP or P123. Moreover, the dilational modulus of BPE is almost the same as that of P123, but much larger than that of BEP. The molecular dynamics simulation provides the conformational variations of block polyethers at the air/water interface.
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Affiliation(s)
- Houjian Gong
- Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, P. R. China
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Meeus J, Chen X, Scurr DJ, Ciarnelli V, Amssoms K, Roberts CJ, Davies MC, Den Mooter GV. Nanoscale Surface Characterization and Miscibility Study of a Spray-Dried Injectable Polymeric Matrix Consisting of Poly(lactic-co-glycolic acid) and Polyvinylpyrrolidone. J Pharm Sci 2012; 101:3473-85. [DOI: 10.1002/jps.23131] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Revised: 02/06/2012] [Accepted: 03/02/2012] [Indexed: 11/10/2022]
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21
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Duchateau C, Pou TE, Hidalgo M, Glénat P, Dicharry C. Interfacial measurements for laboratory evaluation of kinetic hydrate inhibitors. Chem Eng Sci 2012. [DOI: 10.1016/j.ces.2011.12.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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22
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Noskov BA. Dilational surface rheology of polymer and polymer/surfactant solutions. Curr Opin Colloid Interface Sci 2010. [DOI: 10.1016/j.cocis.2010.01.006] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Sonnenschein MF, Redwine OD, Wendt BL, Kastl PE. Colloidal encapsulation of hydrolytically and oxidatively unstable organoborane catalysts and their use in waterborne acrylic polymerization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:12488-12494. [PMID: 19791777 DOI: 10.1021/la9017079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Trialkylborane catalysts and their amine complexes are hydrolytically and oxidatively unstable, decomposing in water very rapidly to trialkylboroxin, borate esters, and boric acid. However, trialkylborane-amine complexes will rapidly partition to a colloidal phase and remain surprisingly stable for long periods of time (>3 months) until such time as the catalyst is brought into an environment convenient for phase transfer. We show that tributylborane-amine complexes can be stored in aqueous solutions of several water-miscible polymers. We show by diffusion-oriented spectroscopy (DOSY) NMR experiments that the tributylborane-amine catalyst diffuses at nearly the same rate as the colloidal phase, providing strong evidence that they coexist. The aqueous colloidal catalysts can then be mixed with polymerizable monomers such as acrylates to produce good-quality polymers. We show that these colloid-encapsulated catalysts are also useful in producing adhesives capable of adhering low-surface-energy plastic substrates, even when formulated in systems containing 45% water. This is the first report of a waterborne structural adhesive.
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Affiliation(s)
- Mark F Sonnenschein
- The Dow Chemical Company, Corporate Research and Development, Midland, Michigan 48674, USA.
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Noskov BA, Grigoriev DO, Latnikova AV, Lin SY, Loglio G, Miller R. Impact of Globule Unfolding on Dilational Viscoelasticity of β-Lactoglobulin Adsorption Layers. J Phys Chem B 2009; 113:13398-404. [DOI: 10.1021/jp905413q] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- B. A. Noskov
- St. Petersburg State University, Chemical Faculty, Universitetsky pr. 2, 198904 St. Petersburg, Russia, MPI für Kolloid- und Grenzflächenforschung, Forschungcampus Golm, D14476 Golm, Germany, National Taiwan University of Science and Technology, Chemical Engineering Department, 43 Keelung Road, Section 4, Taipei, 106 Taiwan, and Universita degli Studi di Firenze, Dipartimento di Chimica Organica, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze, Italy
| | - D. O. Grigoriev
- St. Petersburg State University, Chemical Faculty, Universitetsky pr. 2, 198904 St. Petersburg, Russia, MPI für Kolloid- und Grenzflächenforschung, Forschungcampus Golm, D14476 Golm, Germany, National Taiwan University of Science and Technology, Chemical Engineering Department, 43 Keelung Road, Section 4, Taipei, 106 Taiwan, and Universita degli Studi di Firenze, Dipartimento di Chimica Organica, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze, Italy
| | - A. V. Latnikova
- St. Petersburg State University, Chemical Faculty, Universitetsky pr. 2, 198904 St. Petersburg, Russia, MPI für Kolloid- und Grenzflächenforschung, Forschungcampus Golm, D14476 Golm, Germany, National Taiwan University of Science and Technology, Chemical Engineering Department, 43 Keelung Road, Section 4, Taipei, 106 Taiwan, and Universita degli Studi di Firenze, Dipartimento di Chimica Organica, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze, Italy
| | - S.-Y. Lin
- St. Petersburg State University, Chemical Faculty, Universitetsky pr. 2, 198904 St. Petersburg, Russia, MPI für Kolloid- und Grenzflächenforschung, Forschungcampus Golm, D14476 Golm, Germany, National Taiwan University of Science and Technology, Chemical Engineering Department, 43 Keelung Road, Section 4, Taipei, 106 Taiwan, and Universita degli Studi di Firenze, Dipartimento di Chimica Organica, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze, Italy
| | - G. Loglio
- St. Petersburg State University, Chemical Faculty, Universitetsky pr. 2, 198904 St. Petersburg, Russia, MPI für Kolloid- und Grenzflächenforschung, Forschungcampus Golm, D14476 Golm, Germany, National Taiwan University of Science and Technology, Chemical Engineering Department, 43 Keelung Road, Section 4, Taipei, 106 Taiwan, and Universita degli Studi di Firenze, Dipartimento di Chimica Organica, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze, Italy
| | - R. Miller
- St. Petersburg State University, Chemical Faculty, Universitetsky pr. 2, 198904 St. Petersburg, Russia, MPI für Kolloid- und Grenzflächenforschung, Forschungcampus Golm, D14476 Golm, Germany, National Taiwan University of Science and Technology, Chemical Engineering Department, 43 Keelung Road, Section 4, Taipei, 106 Taiwan, and Universita degli Studi di Firenze, Dipartimento di Chimica Organica, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze, Italy
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Derkach SR, Krägel J, Miller R. Methods of measuring rheological properties of interfacial layers (Experimental methods of 2D rheology). COLLOID JOURNAL 2009. [DOI: 10.1134/s1061933x09010013] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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27
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Dilational surface viscoelasticity of hydroxypropyl methyl cellulose and CnTAB at air–water surface. Carbohydr Polym 2008. [DOI: 10.1016/j.carbpol.2007.08.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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28
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Wang D, Luo L, Zhang L, Zhao S, Wang L, Gong Q, Liao L, Chu Y, Yu J. The Fast Relaxation Process between Hydrophobically Modified Associating Polyacrylamide and Different Surfactants at the Water‐Octane Interface. J DISPER SCI TECHNOL 2007. [DOI: 10.1080/01932690701341843] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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29
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Ríos HE, Fonseca CK, Brito C, Urzúa MD, Cabrera WJ. Adsorption of Poly(Mono‐N‐Alkylmaleate‐Alt‐N‐Vinyl‐2‐Pyrrolidone) Sodium Salts at Air/Water Interface. J MACROMOL SCI B 2007. [DOI: 10.1080/00222340500523826] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Hernán E. Ríos
- a Departamento de Química, Facultad de Ciencias , Universidad de Chile , Chile
| | - Carla K. Fonseca
- a Departamento de Química, Facultad de Ciencias , Universidad de Chile , Chile
| | - Cristián Brito
- a Departamento de Química, Facultad de Ciencias , Universidad de Chile , Chile
| | - Marcela D. Urzúa
- a Departamento de Química, Facultad de Ciencias , Universidad de Chile , Chile
| | - Walton J. Cabrera
- a Departamento de Química, Facultad de Ciencias , Universidad de Chile , Chile
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Wu D, Xu G, Feng Y, Li Y. Aggregation behaviors of gelatin with cationic gemini surfactant at air/water interface. Int J Biol Macromol 2007; 40:345-50. [PMID: 17055045 DOI: 10.1016/j.ijbiomac.2006.09.004] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2006] [Revised: 09/07/2006] [Accepted: 09/07/2006] [Indexed: 11/23/2022]
Abstract
The dilational rheological properties of gelatin with cationic gemini surfactant 1,2-ethane bis(dimethyl dodecyl ammonium bromide) (C(12)C(2)C(12)) at air/water interface were investigated using oscillating barriers method at low frequency (0.005-0.1 Hz), which was compared with single-chain surfactant dodecyltrimethyl ammonium bromide (DTAB). The results indicate that the maximum dilational modulus and the film stability of gelatin-C(12)C(2)C(12) are higher than those of gelatin-DTAB. At high concentration of C(12)C(2)C(12) or DTAB, the dilational modulus of gelatin-surfactant system becomes close to that corresponding to pure surfactant, suggesting gelatin at interface is replaced by surfactant. This replacement is also observed by surface tension measurement. However, it is found that gelatin-C(12)C(2)C(12) system has two obvious breaks but gelatin-DTAB has not in surface tension isotherms. These phenomena are ascribed to the double charges and strong hydrophobicity of C(12)C(2)C(12). Based on these experimental results, a mechanism of gelatin-surfactant interaction at air/water interface is proposed.
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Affiliation(s)
- Dan Wu
- Key Laboratory of Colloid & Interface Chemistry (Shandong University), Education Ministry, Jinan 250100, PR China
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32
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Noskov BA. Dynamic elasticity of triblock copolymer of poly(ethylene oxide) and poly(propylene oxide) on a water surface. COLLOID JOURNAL 2006. [DOI: 10.1134/s1061933x06050103] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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33
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Noskov BA, Akentiev AV, Grigoriev DO, Loglio G, Miller R. Ellipsometric study of nonionic polymer solutions. J Colloid Interface Sci 2006; 282:38-45. [PMID: 15576079 DOI: 10.1016/j.jcis.2004.08.068] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2004] [Accepted: 08/16/2004] [Indexed: 11/17/2022]
Abstract
The thickness and refractive index of adsorption films of poly(vinylpyrrolidone) (PVP) and poly(ethylene glycol) (PEG) were determined by null-ellipsometry at the air-aqueous solution interface. Both parameters, in the same way as the earlier studied dynamic surface elasticity and surface tension, exhibit rather abrupt changes when the concentration approaches the range of semidilute solutions. This behavior can be explained by the worsening of the solvent quality with increasing PEG concentration and by the PVP displacement from the surface by a contamination of high surface activity.
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Affiliation(s)
- B A Noskov
- St. Petersburg State University, Department of Chemistry, Universitetsky pr. 2, 198904 St. Petersburg, Russia
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Monteux C, Mangeret R, Laibe G, Freyssingeas E, Bergeron V, Fuller G. Shear Surface Rheology of Poly(N-isopropylacrylamide) Adsorbed Layers at the Air−Water Interface. Macromolecules 2006. [DOI: 10.1021/ma052552d] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- C. Monteux
- Department of Chemical Engineering, Stanford University, Stanford, California 94305, and Laboratoire de Physique, Ecole Normale Superieure de Lyon, 46 allee d'Italie, 69007 Lyon, France
| | - R. Mangeret
- Department of Chemical Engineering, Stanford University, Stanford, California 94305, and Laboratoire de Physique, Ecole Normale Superieure de Lyon, 46 allee d'Italie, 69007 Lyon, France
| | - G. Laibe
- Department of Chemical Engineering, Stanford University, Stanford, California 94305, and Laboratoire de Physique, Ecole Normale Superieure de Lyon, 46 allee d'Italie, 69007 Lyon, France
| | - E. Freyssingeas
- Department of Chemical Engineering, Stanford University, Stanford, California 94305, and Laboratoire de Physique, Ecole Normale Superieure de Lyon, 46 allee d'Italie, 69007 Lyon, France
| | - V. Bergeron
- Department of Chemical Engineering, Stanford University, Stanford, California 94305, and Laboratoire de Physique, Ecole Normale Superieure de Lyon, 46 allee d'Italie, 69007 Lyon, France
| | - G. Fuller
- Department of Chemical Engineering, Stanford University, Stanford, California 94305, and Laboratoire de Physique, Ecole Normale Superieure de Lyon, 46 allee d'Italie, 69007 Lyon, France
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35
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Noskov BA, Lin SY, Loglio G, Rubio RG, Miller R. Dilational viscoelasticity of PEO-PPO-PEO triblock copolymer films at the air-water interface in the range of high surface pressures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:2647-52. [PMID: 16519465 DOI: 10.1021/la052662d] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The dynamic dilational elasticity of adsorbed and spread films of PEO-PPO-PEO triblock copolymers at the air-water interface was measured as a function of surface pressure, surface age, and frequency. At low surface pressures (<10 mN/m), the surface viscoelasticity is identical to that of PEO homopolymer films. The results at higher surface pressures can be explained by the desorption of PPO segments from the interface and then mixing with PEO segments in water. Unlike some recent results, the spread and adsorbed films are not identical. Spread films exhibit a maximum real part of the dynamic surface elasticity of about 20 mN/m and probably begin to dissolve in water at surface pressures above 19 mN/m. However, the surface elasticity of the adsorbed films decreases beyond the maximum, indicating the formation of a loose surface structure.
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Affiliation(s)
- B A Noskov
- St. Petersburg State University, Chemical Faculty, Universitetsky pr. 2, 198904 St. Petersburg, Russia
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36
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Sinswat P, Gao X, Yacaman MJ, Williams RO, Johnston KP. Stabilizer choice for rapid dissolving high potency itraconazole particles formed by evaporative precipitation into aqueous solution. Int J Pharm 2005; 302:113-24. [PMID: 16109466 DOI: 10.1016/j.ijpharm.2005.06.027] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2004] [Revised: 03/01/2005] [Accepted: 06/22/2005] [Indexed: 11/19/2022]
Abstract
The objective of this study was to investigate the influence of stabilizer type on the physicochemical properties, including dissolution, of ultra-high potency powders containing itraconazole (ITZ) formed by evaporative precipitation into aqueous solution (EPAS). ITZ was dissolved in dichloromethane, which was then atomized through a heated coil at 80 degrees C into an aqueous solution over precise periods of time. Stabilizers were present in either the aqueous, organic or both phases. The dispersions were centrifuged and the supernatant was removed. Three hydrophilic stabilizers were investigated, including polysorbate 80, polyvinyl pyrrolidone and poloxamer 407. Rapid dissolving ultra-high potency of ITZ powders was successfully produced. Greater than 80% of ITZ was dissolved in 5 min compared to only 13% of ITZ bulk powders. The resulting stabilizer-coated drug particles had high drug-to-stabilizer ratios greater than 12, corresponding to potencies (wt drug/wt drug+wt surfactant) as high as 93%. An increase in dissolution rate was correlated with the amount of stabilizer adsorbed and the wettability. The combination of polysorbate 80 and poloxamer 407 present in the aqueous and organic phases, respectively, was superior in achieving high wetting and rapid dissolving ITZ powders. The ability to control the adsorption behavior of stabilizers by using synergistic combinations affords the opportunity to achieve high dissolution rates with higher potencies compared to previously reported values.
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Affiliation(s)
- Prapasri Sinswat
- College of Pharmacy, University of Texas at Austin, Austin, TX 78712, USA
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Noskov BA, Akentiev AV, Bilibin AY, Grigoriev DO, Loglio G, Zorin IM, Miller R. Adsorption kinetics of non-ionic polymers: an ellipsometric study. MENDELEEV COMMUNICATIONS 2005. [DOI: 10.1070/mc2005v015n05abeh002040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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38
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Wang YY, Dai YH, Zhang L, Tang K, Luo L, Gong Q, Zhao S, Li MZ, Wang EJ, Yu JY. The interfacial dilational properties of hydrophobically modified associating polyacrylamide studied by the interfacial tension relaxation method at an oil–water interface. J Colloid Interface Sci 2004; 280:76-82. [PMID: 15476776 DOI: 10.1016/j.jcis.2004.07.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2004] [Accepted: 07/23/2004] [Indexed: 10/26/2022]
Abstract
The interfacial dilational viscoelastic properties of hydrophobically associating block copolymer composed of acrylamide (AM) and a low amount of 2-phenoxylethyl acrylate (POEA) (<1.0 mol%) at the octane-water interfaces were studied by means of the interfacial tension relaxation method. The dependencies of interfacial dilational elasticity and viscous component on the dilational frequency were investigated. The interaction of hydrophobically associating block copolymer [P(AM/POEA)] with sodium dodecyl sulfate (SDS) has been explored. The results show that at lower frequency, the dilational elasticity for different concentration copolymer is close to zero; at higher frequency, the dilational elasticity shows no change with increased frequency; At moderate frequency (10(-3)-1 Hz), the dilational elasticity decreased with a decrease in the dilational frequency. The results show that the hydrophobic groups of [P(AM/POEA)] chains can be associated by inter- or intrachain liaisons in water solution. The dilational viscous component for P(AM/POEA) comes forth a different maximum value at different frequencies when the polymer concentration is different. It is generally believed that the dilational viscous component reflects the summation of the various microscopic relaxation processes at and near the interface and different relaxation processes have different characteristic frequencies. The spectrum of dilational viscous component may appear more than once maximum values at different frequencies. The influence of SDS on the limiting dilational elasticity and viscous component for polymer solution was elucidated. For 5000 ppm polymer solution, the limiting dilational elasticity decreased with an increase in SDS concentration. The dilational viscous component passed through a maximum value with a rise in the dilational frequency, which appeared at different frequency when SDS concentration is different; and the higher is the concentration, the lower is the dilational frequency. It can be explained that macromolecules may be substituted by SDS molecules in the interface and the interaction of molecules decrease, which makes the limiting dilational elasticity decrease. For 200 ppm polymer solution, the limiting dilational elasticity increased firstly and then decreased with SDS concentration increasing. This may be explained that the interfacial polymer concentration is so low that SDS molecules absorbed in the interface dominate dilational properties of the interfacial film even at very low SDS concentration. However, SDS molecules can gradually substitute the polymer molecules in the interface with a rise in SDS concentration, which results in the decrease in the limiting dilational elasticity.
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Affiliation(s)
- Yi-Yang Wang
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, People's Republic of China
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Noskov BA, Akentiev AV, Bilibin AY, Grigoriev DO, Loglio G, Zorin IM, Miller R. Dynamic surface properties of poly(N-isopropylacrylamide) solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:9669-9676. [PMID: 15491201 DOI: 10.1021/la048836t] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The dynamic surface elasticity of aqueous solutions of poly(N-isopropylacrylamide) (pNIPAM) has been measured by the oscillating barrier and capillary wave methods as a function of time and concentration. While the real and imaginary parts of the surface elasticity almost did not change with the concentration, their kinetic dependencies proved to be nonmonotonic. Simultaneous measurements of the film thickness and adsorbed amount by null-ellipsometry showed that the pNIPAM adsorption can be divided into two steps corresponding to the formation of a concentrated narrow region close to the air phase and a region of tails and loops protruding into the bulk liquid. The local maximum of the elasticity can be observed in the course of the first step when the adsorbed macromolecules do not form long loops and tails. The results are in agreement with recent data on the nonequilibrium surface properties of solutions of other nonionic homopolymers and the theory of dilational surface viscoelasticity.
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Affiliation(s)
- B A Noskov
- Chemistry Department, St. Petersburg State University, Universitetsky pr. 2, 198904 St. Petersburg, Russia
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Wang YY, Dai YH, Zhang L, Luo L, Chu YP, Zhao S, Li MZ, Wang EJ, Yu JY. Hydrophobically Modified Associating Polyacrylamide Solutions: Relaxation Processes and Dilational Properties at the Oil−Water Interface. Macromolecules 2004. [DOI: 10.1021/ma049923v] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yi-Yang Wang
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Yu-Hua Dai
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Lu Zhang
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Lan Luo
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Yan-Ping Chu
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Sui Zhao
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Miao-Zhen Li
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Er-Jian Wang
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
| | - Jia-Yong Yu
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 3 Datun Road, Beijing 100101, P. R. China
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Noskov BA, Nuzhnov SN, Loglio G, Miller R. Dynamic Surface Properties of Sodium Poly(styrenesulfonate) Solutions. Macromolecules 2004. [DOI: 10.1021/ma030319e] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- B. A. Noskov
- Chemical Department, St. Petersburg State University, Universitetsky pr. 2, 198904 St. Petersburg, Russia; Dipartimento di Chimica Organica, Universita degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze, Italy; and MPI für Kolloid- und Grenzflächenforschung, Forschungcampus Golm, D14476 Golm, Germany
| | - S. N. Nuzhnov
- Chemical Department, St. Petersburg State University, Universitetsky pr. 2, 198904 St. Petersburg, Russia; Dipartimento di Chimica Organica, Universita degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze, Italy; and MPI für Kolloid- und Grenzflächenforschung, Forschungcampus Golm, D14476 Golm, Germany
| | - G. Loglio
- Chemical Department, St. Petersburg State University, Universitetsky pr. 2, 198904 St. Petersburg, Russia; Dipartimento di Chimica Organica, Universita degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze, Italy; and MPI für Kolloid- und Grenzflächenforschung, Forschungcampus Golm, D14476 Golm, Germany
| | - R. Miller
- Chemical Department, St. Petersburg State University, Universitetsky pr. 2, 198904 St. Petersburg, Russia; Dipartimento di Chimica Organica, Universita degli Studi di Firenze, Via della Lastruccia 13, 50019 Sesto Fiorentino, Firenze, Italy; and MPI für Kolloid- und Grenzflächenforschung, Forschungcampus Golm, D14476 Golm, Germany
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Noskov BA, Akentiev AV, Bilibin AY, Zorin IM, Miller R. Dilational surface viscoelasticity of polymer solutions. Adv Colloid Interface Sci 2003; 104:245-71. [PMID: 12818499 DOI: 10.1016/s0001-8686(03)00045-9] [Citation(s) in RCA: 146] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A review of recent results on the dilational surface viscoelastic properties of aqueous solutions of non-ionic polymers is given. In the frequency range from 0.001 up to 1000 Hz the methods of transverse and longitudinal surface waves and the oscillating barrier method were applied. Viscoelastic behavior of adsorbed polymer films significantly differs from the behavior of films formed by only conventional surfactants of low molecular weight. For example, the dynamic surface elasticity of the former systems is low and almost constant in a broad concentration range. One can observe the increase of the surface elasticity only at extremely low concentrations and/or in the range of semi-dilute solutions. If the surface stress relaxation in conventional surfactant solutions is usually determined by the diffusional exchange between the surface layer and the bulk phase, the relaxation processes in the polymer systems proceed mainly inside the surface layer. Possible mechanism of the latter relaxation is discussed.
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Affiliation(s)
- B A Noskov
- Chemical Department, St Petersburg State University, Universitetsky pr 2, 198904 St Petersburg, Russia.
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Nuzhnov SN, Miller R, Noskov BA. Dynamic surface elasticity of sodium poly(styrenesulfonate) solutions. MENDELEEV COMMUNICATIONS 2003. [DOI: 10.1070/mc2003v013n06abeh001813] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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