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Zheng Y, Bao Z, Fan Y, Wang X. Spectrometric Study on the Hydrophobic Hydration in the Formation of Tween-60 Micelles with Curcumin. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.121065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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2
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Effects of head-group volume on the thermodynamic parameters and species distribution of ionic liquid-based surfactants in water: 1-(n-hexadecyl)-3-alkylimidazolium bromides and chlorides. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3D printing of biocompatible low molecular weight gels: Imbricated structures with sacrificial and persistent N-alkyl-d-galactonamides. J Colloid Interface Sci 2022; 617:156-170. [PMID: 35276518 DOI: 10.1016/j.jcis.2022.02.076] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/17/2022] [Accepted: 02/18/2022] [Indexed: 12/25/2022]
Abstract
HYPOTHESIS We have shown earlier that low molecular weight gels based on N-heptyl-d-galactonamide hydrogels can be 3D printed by solvent exchange, but they tend to dissolve in the printing bath. We wanted to explore the printing of less soluble N-alkyl-d-galactonamides with longer alkyl chains. Less soluble hydrogels could be good candidates as cell culture scaffolds. EXPERIMENTS N-hexyl, N-octyl and N-nonyl-d-galactonamide solutions in dimethylsulfoxide are injected in a bath of water following patterns driven by a 2D drawing robot coupled to a z-platform. Solubilization of the gels with time has been determined and solubility of the gelators has been measured by NMR. Imbricated structures have been built with N-nonyl-d-galactonamide as a persistent ink and N-hexyl or N-heptyl-d-galactonamide as sacrificial inks. Human mesenchymal stem cells have been cultured on N-nonyl-d-galactonamide hydrogels prepared by cooling or by 3D printing. FINDINGS The conditions for printing well-resolved 3D patterns have been determined for the three gelators. In imbricated structures, the solubilization of N-hexyl or N-heptyl-d-galactonamide occurred after a few hours or days and gave channels. Human mesenchymal stem cells grown on N-nonyl-d-galactonamide hydrogels prepared by heating-cooling, which are stable and have a fibrillar microstructure, developed properly. 3D printed hydrogels, which microstructure is made of micrometric flakes, appeared too fragile to withstand cell growth.
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Arumughan V, Nypelö T, Hasani M, Larsson A. Calcium Ion-Induced Structural Changes in Carboxymethylcellulose Solutions and Their Effects on Adsorption on Cellulose Surfaces. Biomacromolecules 2021; 23:47-56. [PMID: 34936336 PMCID: PMC8753602 DOI: 10.1021/acs.biomac.1c00895] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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The adsorption of
carboxymethylcellulose (CMC) on cellulose surfaces
is one of the most studied examples of the adsorption of an anionic
polyelectrolyte on a like-charged surface. It has been suggested that
divalent ions can act as a bridge between CMC chains and the surface
of cellulose and enhance the CMC adsorption: they can, however, also
alter the structure of CMCs in the solution. In previous investigations,
the influence of cations on solution properties has been largely overlooked.
This study investigates the effect of Ca2+ ions on the
properties of CMC solutions as well as the influence on cellulose
nanofibers (CNFs), which was studied by dynamic light scattering and
correlated with the adsorption of CMC on a cellulose surface probed
using QCM-D. The presence of Ca2+ facilitated the multichain
association of CMC chains and increased the hydrodynamic diameter.
This suggests that the adsorption of CMCs at high concentrations of
CaCl2 is governed mainly by changes in solution properties
rather than by changes in the cellulose surface. Furthermore, an entropy-driven
mechanism has been suggested for the adsorption of CMC on cellulose.
By comparing the adsorption of CMC from H2O and D2O, it was found that the release of water from the cellulose surface
is driving the adsorption of CMC.
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Affiliation(s)
- Vishnu Arumughan
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.,AvanCell, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
| | - Tiina Nypelö
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.,Wallenberg Wood Science Center, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
| | - Merima Hasani
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.,AvanCell, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.,Wallenberg Wood Science Center, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
| | - Anette Larsson
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.,AvanCell, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.,Wallenberg Wood Science Center, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden.,FibRe─Centre for Lignocellulose-based Thermoplastics, Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
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Bayrak M, Mata J, Raynes JK, Greaves M, White J, Conn CE, Floury J, Logan A. Investigating casein gel structure during gastric digestion using ultra-small and small-angle neutron scattering. J Colloid Interface Sci 2021; 594:561-574. [PMID: 33780761 DOI: 10.1016/j.jcis.2021.03.087] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 02/24/2021] [Accepted: 03/15/2021] [Indexed: 11/25/2022]
Abstract
This study aimed to understand the structural devolution of 10% w/w rennet-induced (RG) and transglutaminase-induced acid (TG) gels in H2O and D2O under in vitro gastric conditions with and without pepsin. The real-time devolution of structure at a nano- (e.g. colloidal calcium phosphate (CCP) and micelle) and micro- (gel network) level was determined using ultra-small (USANS) and small-angle neutron scattering (SANS) with electron microscopy. Results demonstrate that gel firmness or elasticity determines disintegration behaviour during simulated mastication and consequently the particle size entering the stomach. Shear of mixing in the stomach, pH, and enzyme activity will also affect the digestion process. Our results suggest that shear of mixing primarily results in erosion at the particle surface and governs gel disintegration behaviour during the early stages of digestion. Pepsin diffusivity, and hence action, occur more readily in the latter stages of gastric digestion via access to the particle interior. This occurs via the progressively larger pores of the looser gel network and channels created within the larger, less dense casein micelles of the RG gels. Gel firmness and brittleness were greater in the D2O samples compared to H2O, facilitating gel disintegration. Despite the higher strength and elasticity of RG compared to TG, the protein network strands of the RG gels become more compact when exposed to the acidic gastric environment with comparatively larger pores observed through SEM imaging. This led to a higher degree of digestibility in RG gels compared to TG gels. This is the first study to examine casein gel structure during simulated gastric digestion using scattering and highlights the benefits of neutron scattering to monitor structural changes during digestion at multiple length scales.
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Affiliation(s)
- Meltem Bayrak
- CSIRO Agriculture and Food, 671 Sneydes Road, Werribee, Victoria 3030, Australia; School of Science, STEM College, RMIT University, 124 La Trobe Street, Melbourne, VIC 3000, Australia.
| | - Jitendra Mata
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia.
| | - Jared K Raynes
- CSIRO Agriculture and Food, 671 Sneydes Road, Werribee, Victoria 3030, Australia.
| | - Mark Greaves
- CSIRO Manufacturing, Bayview Avenue, Clayton, VIC 3168, Australia.
| | - Jacinta White
- CSIRO Manufacturing, Bayview Avenue, Clayton, VIC 3168, Australia.
| | - Charlotte E Conn
- School of Science, STEM College, RMIT University, 124 La Trobe Street, Melbourne, VIC 3000, Australia.
| | | | - Amy Logan
- CSIRO Agriculture and Food, 671 Sneydes Road, Werribee, Victoria 3030, Australia.
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Shin MJ, Kim JD. Reversible Chromatic Response of Polydiacetylene Derivative Vesicles in D2O Solvent. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:882-888. [PMID: 26730887 DOI: 10.1021/acs.langmuir.5b03945] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The thermal chromatic sensitivity of polydiacetylenes (PDAs) with 10,12-pentacosadiynoic acid (PCDA) derivatives, which have a hydroxyl group (HEEPCDA) and an amine group (APPCDA), were investigated using D2O and H2O as solvents. The vesicle solution with polymerized HEEPCDA exhibited a reversible chromatic response during the heating and cooling cycle in D2O, but not in H2O. On the other hand, the vesicle solution with the polymerized APPCDA exhibited a reversible chromatic response in H2O during the heating and cooling cycle, but the color of the solution did not change much in D2O. The critical vesicle concentration of HEEPCDA was lower in D2O than in H2O, and the chromatic sensitivity of the polymerized vesicles to temperature was slower in D2O than in H2O. We think that it is due to D2O being a more highly structured solvent than H2O with the hydrogen bonding in D2O stronger than that in H2O.
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Affiliation(s)
- Min Jae Shin
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Korea
| | - Jong-Duk Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141, Korea
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Sharifi R, Samaraweera M, Gascón JA, Papadimitrakopoulos F. Thermodynamics of the Quasi-Epitaxial Flavin Assembly around Various-Chirality Carbon Nanotubes. J Am Chem Soc 2014; 136:7452-63. [DOI: 10.1021/ja502714z] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Roholah Sharifi
- Nanomaterials Optoelectronics Laboratory (NOEL), Polymer Program,
Institute of Materials Science and ‡Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3136, United States
| | - Milinda Samaraweera
- Nanomaterials Optoelectronics Laboratory (NOEL), Polymer Program,
Institute of Materials Science and ‡Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3136, United States
| | - José A. Gascón
- Nanomaterials Optoelectronics Laboratory (NOEL), Polymer Program,
Institute of Materials Science and ‡Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3136, United States
| | - Fotios Papadimitrakopoulos
- Nanomaterials Optoelectronics Laboratory (NOEL), Polymer Program,
Institute of Materials Science and ‡Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3136, United States
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Sharifi R, Abanulo DC, Papadimitrakopoulos F. Isotopically induced variation in the stability of FMN-wrapped carbon nanotubes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:7209-7215. [PMID: 23402431 PMCID: PMC3683083 DOI: 10.1021/la304615g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Isotopic, hydrogen-to-deuterium substitution has been an invaluable tool in the characterization of small molecules and biological nanostructures. The natural variability of most inorganic nanomaterials has hindered the use of isotopic substitution in gaining meaningful insights into their structure. The ideal helical wrapping of a flavin mononucleotide (FMN) around (8,6)-SWNTs (single-walled carbon nanotubes) is presently utilized to probe isotopically dependent intermolecular interactions. The facile proton-to-deuterium exchange of the imide group of FMN enabled us to alter the intermolecular stability of the helix depending on the surrounding solvent (i.e., H2O vs D2O). Our studies show that FMN-dispersed (8,6)-SWNTs exhibit greater stability in D2O than in H2O. The higher complex stability in D2O was verified on the basis of (i) FMN helix replacement with SDBS (sodium dodecylbenzenesulfate) and (ii) thermal- and (iii) pH-induced helix dissociation. This is in agreement with the previously observed stronger amide H-bonding of proteins in D2O, and to the best of our knowledge, it demonstrates the architectural fidelity of FMN-wrapped SWNTs, which is expected to enhance the assembly repertoire of carbon nanotubes further.
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Affiliation(s)
- R. Sharifi
- Department of Chemistry, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3136, USA
| | - D. C. Abanulo
- Nanomaterials Optoelectronics Laboratory (NOEL), Polymer Program, University of Connecticut, Storrs, Connecticut 06269-3136, USA
| | - F. Papadimitrakopoulos
- Department of Chemistry, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269-3136, USA
- Nanomaterials Optoelectronics Laboratory (NOEL), Polymer Program, University of Connecticut, Storrs, Connecticut 06269-3136, USA
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Zakharova L, Voronin M, Semenov V, Gabdrakhmanov D, Syakaev V, Gogolev Y, Giniyatullin R, Lukashenko S, Reznik V, Latypov S, Konovalov A, Zuev Y. Supramolecular systems based on novel mono- and dicationic pyrimidinic amphiphiles and oligonucleotides: a self-organization and complexation study. Chemphyschem 2012; 13:788-96. [PMID: 22287323 DOI: 10.1002/cphc.201100888] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2011] [Indexed: 11/11/2022]
Abstract
Novel mono- and dicationic pyrimidinic surfactants are synthesized and their aggregation behavior is studied by methods of tensiometry and nuclear magnetic resonance (NMR) self-diffusion. To estimate their potentiality as gene delivery agents, the complexation with oligonucleotides (ONus) is explored by dynamic light scattering (DLS) and zeta-potential titration methods and ethidium bromide exclusion experiments. Bola-type pyrimidinic amphiphile (BPM) demonstrates rather a weak affinity to ONus. Although it induces mixed associations with ONus, only slight charge compensation changes occur at a large excess of bola, with no recharging reached. Similarly, the ethydium bromide exclusion study reveals a slow increase in the binding capacity toward an ONu with an increment in BPM concentration. The monocationic pyrimidinic surfactant (MPM) and its gemini analogue (GPM-1) are ranked as intermediates in both their aggregative activity and complexing properties toward ONus. They both form mixed associates with ONus well below the critical micelle concentrations (cmcs) of 2 and 15 mM respectively. However, GPM-1 has a much lower isoelectric point at the molar ratio surfactant/ONu r~1 compared to r~3 for MPM. This probably indicates a larger electrostatic contribution to the ONu complexation in the case of GPM-1. The most hydrophobic pyrimidinic surfactant (GPM-2), bearing three alkyl tails, demonstrates enhanced aggregative activity and binding capacity toward ONus as compared to former pyrimidinic surfactants. Due to effective aggregative (low cmc of 0.04 mM) plus binding properties (fraction of bound ONu β=0.76 at r=2.5), GPM-2 may be ranked as a promising agent for wider biological applications.
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Affiliation(s)
- Lucia Zakharova
- A E Arbuzov Institute of Organic and Physical Chemistry of Kazan Scientific Center of the Russian Academy of Sciences, Kazan, Russia.
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Kashapov RR, Pashirova TN, Kharlamov SV, Ziganshina AY, Ziltsova EP, Lukashenko SS, Zakharova LY, Habicher WD, Latypov SK, Konovalov AI. Novel self-assembling system based on resorcinarene and cationic surfactant. Phys Chem Chem Phys 2011; 13:15891-8. [DOI: 10.1039/c1cp20906j] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Ozawa T, Asakawa T, Ohta A, Miyagishi S. New Fluorescent Probes Applicable to Aggregates of Fluorocarbon Surfactants. J Oleo Sci 2007; 56:587-93. [DOI: 10.5650/jos.56.587] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Asakawa T, Okada T, Hayasaka T, Kuwamoto K, Ohta A, Miyagishi S. The unusual micelle micropolarity of partially fluorinated gemini surfactants sensed by pyrene fluorescence. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:6053-5. [PMID: 16800658 DOI: 10.1021/la060787s] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
New gemini surfactants having two fluorocarbon chains were prepared by refluxing partially fluorinated alkyl bromide with N,N,N',N'-tetramethyl-1,6-diaminohexane in acetonitrile. The partially fluorinated gemini surfactants containing a six-methylene spacer chain are easily soluble in water. The critical micelle concentrations (cmc's) were determined by various fluorescent probe methods. The hydrophobicity of a CF2 group was estimated to be 1.5 times that of a CH2 group according to the cmc values. The micelle micropolarity of a fluorocarbon gemini sensed by pyrene fluorescence was unusually high, suggesting an apparent iceberg-like environment in the location of pyrene. The significantly small micelle aggregation numbers of fluorinated gemini surfactants were ascertained by the pyrene fluorescence quenching method. The micelle ionization degree estimated by fluorescence quenching of 6-methoxy-N-(3-sulfopropyl)quinolinium (SPQ) gave tendencies similar to those of the corresponding hydrocarbon geminis.
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Affiliation(s)
- Tsuyoshi Asakawa
- Division of Material Sciences, Graduate School of Natural Science & Technology, Kanazawa University, Kanazawa 920-1192, Japan.
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