1
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Kaul N, Bergamasco L, Song H, Varkevisser T, Amati A, Falciani G, van Rijn CJM, Chiavazzo E, Sen I, Bonnet S, Hammarström L. Realizing Symmetry-Breaking Architectures in Soap Films. PHYSICAL REVIEW LETTERS 2024; 132:028201. [PMID: 38277585 DOI: 10.1103/physrevlett.132.028201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 10/02/2023] [Accepted: 12/11/2023] [Indexed: 01/28/2024]
Abstract
We show here that soap films-typically expected to host symmetric molecular arrangements-can be constructed with differing opposite surfaces, breaking their symmetry, and making them reminiscent of functional biological motifs found in nature. Using fluorescent molecular probes as dopants on different sides of the film, resonance energy transfer could be employed to confirm the lack of symmetry, which was found to persist on timescales of several minutes. Further, a theoretical analysis of the main transport phenomena involved yielded good agreement with the experimental observations.
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Affiliation(s)
- Nidhi Kaul
- Department of Chemistry, Ångström Laboratory, Uppsala University, Box 523, 751 20 Uppsala, Sweden
| | - Luca Bergamasco
- Department of Energy, Politecnico di Torino, Torino 10129, Italy
| | - Hongwei Song
- Department of Chemistry, Ångström Laboratory, Uppsala University, Box 523, 751 20 Uppsala, Sweden
| | - Thijs Varkevisser
- Nanotechnology and Microfluidics, Institute of Physics, University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
| | - Agnese Amati
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | | | - Cees J M van Rijn
- Nanotechnology and Microfluidics, Institute of Physics, University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
| | | | - Indraneel Sen
- Wasabi Innovations Ltd., Boulevard "Shipchenski Prohod" 18, Block A, Floor 3, Office 9, Slatina, Galaxy Business Center, 1113 Sofia, Bulgaria
| | - Sylvestre Bonnet
- Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Leif Hammarström
- Department of Chemistry, Ångström Laboratory, Uppsala University, Box 523, 751 20 Uppsala, Sweden
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2
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Tong WK, Dai C, Hu J, Li J, Gao MT, You X, Feng XR, Li Z, Zhou L, Zhang Y, Lai X, Kahon L, Fu R. A novel eco-friendly strategy for removing phenanthrene from groundwater: Synergism of nanobubbles and rhamnolipid. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 907:168099. [PMID: 37884130 DOI: 10.1016/j.scitotenv.2023.168099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 10/21/2023] [Accepted: 10/22/2023] [Indexed: 10/28/2023]
Abstract
Nanobubbles (NBs), given their unique properties, could theoretically be paired with rhamnolipids (RL) to tackle polycyclic aromatic hydrocarbon contamination in groundwater. This approach may overcome the limitations of traditional surfactants, such as high toxicity and low efficiency. In this study, the remediation efficiency of RL, with or without NBs, was assessed through soil column experiments (soil contaminated with phenanthrene). Through the analysis of the two-site non-equilibrium diffusion model, there was a synergistic effect between NBs and RL. The introduction of NBs led to a reduction of up to 24.3 % in the total removal time of phenanthrene. The direct reason for this was that with NBs, the retardation factor of RL was reduced by 1.9 % to 15.4 %, which accelerated the solute replacement of RL. The reasons for this synergy were multifaceted. Detailed analysis reveals that NBs improve RL's colloidal stability, increase its absolute zeta potential, and reduce its soil adsorption capacity by 13.3 %-19.9 %. Furthermore, NBs and their interaction with RL substantially diminish the surface tension, contact angle, and dynamic viscosity of the leaching solution. These changes in surface thermodynamic and rheological properties significantly enhance the migration efficiency of the eluent. The research outcomes facilitate a thorough comprehension of NBs' attributes and their relevant applications, and propose an eco-friendly method to improve the efficiency of surfactant remediation.
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Affiliation(s)
- Wang Kai Tong
- College of Civil Engineering, Tongji University, Shanghai 200092, China; Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China
| | - Chaomeng Dai
- College of Civil Engineering, Tongji University, Shanghai 200092, China.
| | - Jiajun Hu
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China.
| | - Jixiang Li
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Min-Tian Gao
- Shanghai Key Laboratory of Bio-Energy Crops, School of Life Sciences, Shanghai University, Shanghai 200444, China
| | - Xueji You
- College of Civil Engineering, Tongji University, Shanghai 200092, China
| | - Xin Ru Feng
- Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Zhi Li
- College of Civil Engineering, Tongji University, Shanghai 200092, China
| | - Lang Zhou
- Department of Civil, Architectural and Environmental Engineering, University of Texas at Austin, Austin, TX 78712, United States
| | - Yalei Zhang
- College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Xiaoying Lai
- College of Management and Economics, Tianjin University, Tianjin 300072, China
| | - Long Kahon
- Department of Environmental Engineering, Faculty of Engineering and Green Technology, Universitiy Tunku Abdul Rahman, 31900 Kampar, Perak, Malaysia
| | - Rongbing Fu
- College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
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3
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Håkansson A, Nilsson L. Emulsifier adsorption kinetics influences drop deformation and breakup in turbulent emulsification. SOFT MATTER 2023; 19:9059-9073. [PMID: 37982600 DOI: 10.1039/d3sm01213a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2023]
Abstract
Turbulent drop breakup is of large importance for applications such as food and pharmaceutical processing, as well as of substantial fundamental scientific interest. Emulsification typically takes place in the presence of surface-active emulsifiers (natural occurring and/or added). Under equilibrium conditions, these lower the interfacial tension, enabling deformation and breakup. However, turbulent deformation is fast in relation to emulsifier kinetics. Little is known about the details of how the emulsifier influences drop deformation under turbulent conditions. During the last years, significant insight in the mechanism of turbulent drop breakup has been reached using numerical experiments. However, these studies typically use a highly simplistic description of how the interface responds to turbulent stress. This study investigates how the limited exchange rate of emulsifier between the bulk and the interface influences the deformation process in turbulent drop breakup for application-relevant emulsifiers and concentrations, in the context of state-of-the-art single drop breakup simulations. In conclusion, if the Weber number is high or the emulsifier is supplied at a concentration giving an adsorption time less than 1/10th of the drop breakup time, deformation proceeds as if the emulsifier adsorbed infinitely fast. Otherwise, the limited emulsifier kinetics delays breakup and can alter the breakup mechanism.
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Affiliation(s)
- Andreas Håkansson
- Department of Food Technology, Engineering and Nutrition, Lund University, Sweden.
| | - Lars Nilsson
- Department of Food Technology, Engineering and Nutrition, Lund University, Sweden.
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4
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Schmidt R, Giubertoni G, Caporaletti F, Kolpakov P, Shahidzadeh N, Ariese F, Woutersen S. Raman Diffusion-Ordered Spectroscopy. J Phys Chem A 2023; 127:7638-7645. [PMID: 37656920 PMCID: PMC10510375 DOI: 10.1021/acs.jpca.3c03232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/25/2023] [Indexed: 09/03/2023]
Abstract
The Stokes-Einstein relation, which relates the diffusion coefficient of a molecule to its hydrodynamic radius, is commonly used to determine molecular sizes in chemical analysis methods. Here, we combine the size sensitivity of such diffusion-based methods with the structure sensitivity of Raman spectroscopy by performing Raman diffusion-ordered spectroscopy (Raman-DOSY). The core of the Raman-DOSY setup is a flow cell with a Y-shaped channel containing two inlets: one for the sample solution and one for the pure solvent. The two liquids are injected at the same flow rate, giving rise to two parallel laminar flows in the channel. After the flow stops, the solute molecules diffuse from the solution-filled half of the channel into the solvent-filled half at a rate determined by their hydrodynamic radius. The arrival of the solute molecules in the solvent-filled half of the channel is recorded in a spectrally resolved manner by Raman microspectroscopy. From the time series of Raman spectra, a two-dimensional Raman-DOSY spectrum is obtained, which has the Raman frequency on one axis and the diffusion coefficient (or equivalently, hydrodynamic radius) on the other. In this way, Raman-DOSY spectrally resolves overlapping Raman peaks arising from molecules of different sizes. We demonstrate Raman-DOSY on samples containing up to three compounds and derive the diffusion coefficients of small molecules, proteins, and supramolecules (micelles), illustrating the versatility of Raman-DOSY. Raman-DOSY is label-free and does not require deuterated solvents and can thus be applied to samples and matrices that might be difficult to investigate with other diffusion-based spectroscopy methods.
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Affiliation(s)
- Robert
W. Schmidt
- Vrije
Universiteit Amsterdam, De Boelelaan 1105, 1081HV Amsterdam, The Netherlands
- University
of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
| | - Giulia Giubertoni
- University
of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
| | - Federico Caporaletti
- University
of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
- Université
Libre de Bruxelles, Av.
Franklin Roosevelt 50, 1050 Bruxelles, Belgium
| | - Paul Kolpakov
- University
of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
| | | | - Freek Ariese
- Vrije
Universiteit Amsterdam, De Boelelaan 1105, 1081HV Amsterdam, The Netherlands
| | - Sander Woutersen
- University
of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
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5
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Guimarães CFRC, Félix AS, Brandão TAS, Bemquerer MP, Piló-Veloso D, Verly RM, Resende JM. Optimizing the synthesis of dimeric peptides: influence of the reaction medium and effects that modulate kinetics and reaction yield. Amino Acids 2023; 55:1201-1212. [PMID: 37543997 DOI: 10.1007/s00726-023-03309-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 07/21/2023] [Indexed: 08/08/2023]
Abstract
Peptides are remarkably interesting alternatives to several applications. In particular, antimicrobial sequences have raised major interest of the scientific community due to the resistance acquired by commonly used antibiotics. Amongst these, some dimeric peptides have shown very promising characteristics as strong biological activities and resistance against degradation by peptidases. However, despite such promising characteristics, a relatively small number of studies address dimeric peptides, mainly due to the synthesis-related obstacles in their production, whereas the well-implemented routines of solid phase peptide synthesis-which includes the possibility of automation-makes life significantly easier. Here, we present kinetic investigations of the dimerization of a cysteine-containing sequence to obtain the homodimeric antimicrobial peptide homotarsinin. Based on the structural and membrane interaction data already available for the dimer and its monomeric chain, we have proposed distinct dimerization protocols in selected environments, namely, aqueous buffer, TFE:H2O and micellar solutions. The experimental results were adjusted by a theoretical model. Both the kinetic profiles and the reaction yields are dependent on the reaction medium, clearly indicating that aggregation, peptide structure, and peptide-membrane interactions play major roles in the formation of the disulfide bond. Finally, the rationalization of the different aspects addressed here is expected to contribute to research and applications that demand the obtainment of dimeric peptides.
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Affiliation(s)
- Carlos F R C Guimarães
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, P.O. Box 486, Belo Horizonte, MG, 31270-901, Brazil
- Present Address: Universidade Nilton Lins, Avenida Professor Nilton Lins, Manaus, AM, 69058-030, Brazil
| | - Amanda S Félix
- Departamento de Química, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, 39100-000, Brazil
| | - Tiago A S Brandão
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, P.O. Box 486, Belo Horizonte, MG, 31270-901, Brazil
| | - Marcelo P Bemquerer
- Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA), Embrapa Gado de Leite, Juiz de Fora, MG, 36038-330, Brazil
| | - Dorila Piló-Veloso
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, P.O. Box 486, Belo Horizonte, MG, 31270-901, Brazil
| | - Rodrigo M Verly
- Departamento de Química, Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG, 39100-000, Brazil.
| | - Jarbas M Resende
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, P.O. Box 486, Belo Horizonte, MG, 31270-901, Brazil.
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6
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Kai Tong W, Dai C, Hu J, Li J, Gao MT, Li Z, Zhou L, Zhang Y, Kahon L. Solubilization and remediation of polycyclic aromatic hydrocarbons in groundwater by cationic surfactants coupled nanobubbles: Synergistic mechanism and application. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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7
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Development of fluorescent azapentalenes to study the reactivity of hypochlorous acid and chloramines in micellar systems. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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8
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Alva-Ensastegui J, Palomar-Pardavé M, Ramírez-Silva M, Aparicio-Gutiérrez N. Quercetin Displacement Caused By Sodium Dodecyl Sulphate On Inclusion Complex Quercetin-Beta Cyclodextrin In An Acid Environment. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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9
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Palmer TR, van der Kooij HM, Abu Bakar R, Duewel M, Greiner K, McAleese CD, Couture P, Sharpe MK, Smith RW, Keddie JL. How Particle Deformability Influences the Surfactant Distribution in Colloidal Polymer Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:12689-12701. [PMID: 36194469 PMCID: PMC9583616 DOI: 10.1021/acs.langmuir.2c02170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 09/19/2022] [Indexed: 06/16/2023]
Abstract
The distribution of surfactants in waterborne colloidal polymer films is of significant interest for scientific understanding and defining surface properties in applications including pressure-sensitive adhesives and coatings. Because of negative effects on appearance, wetting, and adhesion, it is desirable to prevent surfactant accumulation at film surfaces. The effect of particle deformation on surfactant migration during film formation was previously investigated by Gromer et al. through simulations, but experimental investigations are lacking. Here, we study deuterium-labeled sodium dodecyl sulfate surfactant in a poly(butyl acrylate) latex model system. The particle deformability was varied via cross-linking of the intraparticle polymer chains by differing extents. The cross-linker concentration varied from 0 to 35 mol % in the copolymer, leading to a transition from viscoelastic to elastic. Ion beam analysis was used to probe the dry films and provide information on the near-surface depth distribution of surfactant. Films of nondeformable particles, containing the highest concentration of cross-linker, show no surfactant accumulation at the top surface. Films from particles partially deformed by capillary action show a distinct surfactant surface layer (ca. 150 nm thick). Films of coalesced particles, containing little or no cross-linker, show a very small amount of surfactant on the surface (ca. 20 nm thick). The observed results are explained by considering the effect of cross-linking on rubber elasticity and applying the viscous particle deformation model by Gromer et al. to elastically deformed particles. We find that partially deformed particles allow surfactant transport to the surface during film formation, whereas there is far less transport when skin formation acts as a barrier. With elastic particles, the surfactant is carried in the water phase as it falls beneath the surface of packed particles. The ability to exert control over surfactant distribution in waterborne colloidal films will aid in the design of new high-performance adhesives and coatings.
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Affiliation(s)
- Toby R. Palmer
- Department
of Physics, University of Surrey, Guildford, SurreyGU2 7XH, United Kingdom
| | - Hanne M. van der Kooij
- Physical
Chemistry and Soft Matter, Wageningen University
& Research, 6708 WEWageningen, The Netherlands
| | - Rohani Abu Bakar
- Department
of Physics, University of Surrey, Guildford, SurreyGU2 7XH, United Kingdom
| | - Mathis Duewel
- Synthomer
Germany GmbH, Werrastraße
10, 45768Marl, Germany
| | - Katja Greiner
- Synthomer
Germany GmbH, Werrastraße
10, 45768Marl, Germany
| | - Callum D. McAleese
- Surrey
Ion Beam Centre, University of Surrey, Guildford, SurreyGU2 7XH, United Kingdom
| | - Pierre Couture
- Surrey
Ion Beam Centre, University of Surrey, Guildford, SurreyGU2 7XH, United Kingdom
| | - Matthew K. Sharpe
- Surrey
Ion Beam Centre, University of Surrey, Guildford, SurreyGU2 7XH, United Kingdom
| | - Richard W. Smith
- Surrey
Ion Beam Centre, University of Surrey, Guildford, SurreyGU2 7XH, United Kingdom
| | - Joseph L. Keddie
- Department
of Physics, University of Surrey, Guildford, SurreyGU2 7XH, United Kingdom
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10
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Zueva OS, Rukhlov VS, Zuev YF. Morphology of Ionic Micelles as Studied by Numerical Solution of the Poisson Equation. ACS OMEGA 2022; 7:6174-6183. [PMID: 35224381 PMCID: PMC8867794 DOI: 10.1021/acsomega.1c06665] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 02/01/2022] [Indexed: 06/14/2023]
Abstract
The existing concepts of the ionic micelle structure were specified. It was noted that the composition of dispersed phase particles in a liquid dispersion medium should necessarily include adsorbed counterions rigidly bound to these particles. By numerical solution of the Poisson equation for the two most often used approximations, the Poisson-Boltzmann (PB) model and the Jellium-approximation (JA), the electric potential decay from the Stern potential of dispersed phase particles was defined. A new methodological approach to analyze the reaction of micelle potential decay based on small variability of the CMC value was proposed. It made possible to determine the dimension parameter, which in the presence of weak thermal effects approximately corresponds to the micelle hydrodynamic radius, and to calculate the electrokinetic potential of micelles. The results of theoretical calculations were compared with our previous experimental data on the thickness of the SDS micelle hydrophilic layer obtained by SAXS. A good agreement between the calculated and measured values was obtained, and it was noted that for low concentrations the experimental values are more correctly described by the PB model, but for concentrations greater than 100 mM the JA model is more preferable. It was found that the slipping plane is located near the outer Stern plane and is separated from it only by a few molecular layers of water. The influence stronger than the thermal one can shift the slipping plane closer to the micelle core. Accordingly, the smallest hydrodynamic micelle size is determined by the outer Stern plane. The results of our work allowed us to conclude that the micelle is not something soft and watery, but according to its specified structure, it is a more solid-like particle than was previously assumed. The proposed approach can be extended to investigate other effects of a physicochemical nature, in particular, those observed with the addition of an external electrolyte or nanoparticles.
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Affiliation(s)
- Olga S. Zueva
- Kazan
State Power Engineering University, 51 Krasnoselskaya Str., Kazan 420066, Russia
| | - Vladimir S. Rukhlov
- Kazan
State Power Engineering University, 51 Krasnoselskaya Str., Kazan 420066, Russia
| | - Yuriy F. Zuev
- Kazan
Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center, Russian Academy of Sciences, Lobachevsky Str., 2/31 Kazan 420111, Russia
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11
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Lisuzzo L, Cavallaro G, Milioto S, Lazzara G. Halloysite nanotubes as nanoreactors for heterogeneous micellar catalysis. J Colloid Interface Sci 2022; 608:424-434. [PMID: 34626986 DOI: 10.1016/j.jcis.2021.09.146] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 09/22/2021] [Accepted: 09/23/2021] [Indexed: 02/08/2023]
Abstract
HYPOTHESIS Electrostatic attractions between the anionic head group of sodium alkylsulphates and the positively charged inner surface of halloysite nanotubes (HNTs) drive to the formation of tubular inorganic micelles, which might be employed as nanoreactors for the confinement of non polar compounds in aqueous media. On this basis, sodium alkylsulphates/halloysite hybrids could be efficient nanocatalysts for organic reactions occurring in water. EXPERIMENTS Sodium decylsulphate (NaDeS) and sodium dodecylsulphate (NaDS) were selected for the functionalization of the halloysite cavity. The composition, the structure and the surface charge properties of the hybrid nanotubes were determined. The actual formation of inorganic micelles was explored by studying the microviscosity and polarity characteristics of the surfactant modified nanotubes through fluorescence spectroscopy experiments using DiPyme as probe. The performances of the sodium alkylsulphates/halloysite composites as micellar catalysts for the Belousov-Zhabotinsky (BZ) reaction were investigated. FINDINGS The halloysite functionalization with sodium alkylsulphates generated the formation of hydrophobic microdomains with an enhanced microviscosity. Compared to the surfactant conventional micelles, the functionalized nanotubes induced larger enhancements on the rate constant of the BZ reaction. This is the first report on the surfactant/halloysite hybrids showing their efficiencies as reusable nanocatalysts, which are dependent on their peculiar microviscosity and polarity properties.
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Affiliation(s)
- Lorenzo Lisuzzo
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, pad. 17, Palermo 90128, Italy
| | - Giuseppe Cavallaro
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, pad. 17, Palermo 90128, Italy.
| | - Stefana Milioto
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, pad. 17, Palermo 90128, Italy
| | - Giuseppe Lazzara
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, pad. 17, Palermo 90128, Italy
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12
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Hussain A, Shuaibu AD, Shaikh AJ, Khan AM. Exploring the effects of selected essential amino acids on the self-association of sodium dodecyl sulphate at different temperatures. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118003] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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13
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Kubyshkin V, Bürck J, Babii O, Budisa N, Ulrich AS. Remarkably high solvatochromism in the circular dichroism spectra of the polyproline-II conformation: limitations or new opportunities? Phys Chem Chem Phys 2021; 23:26931-26939. [PMID: 34825904 DOI: 10.1039/d1cp04551b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Circular dichroism is a conventional method for studying the secondary structures of peptides and proteins and their transitions. While certain circular dichroism features are characteristic of α-helices and β-strands, the third most abundant secondary structure, the polyproline-II helix, does not exhibit a strictly conserved spectroscopic appearance. Due to its extended nature, the polyproline-II helix is highly accessible to the surrounding solvent; thus, the environment has a critical influence on the lineshape of the circular dichroism spectra of this structure. To showcase possible effects due to the medium, in this work, we report an experimental spectroscopic study of polyproline-II-forming oligomeric peptides in various environments: solvents, detergent micelles, and liposomes. Strikingly, the examination of an oligomeric peptide in a solvent series showed a remarkable 7 nm solvatochromic shift in the main negative band starting with hexafluoropropan-2-ol and moving to hexane. Furthermore, a previously predicted positive band below 200 nm was discovered in the spectra in nonpolar environments. In isotropic liposomes, the expected transition to the transmembrane state correlated with the appearance of a positive band at 228 nm. Our results demonstrate that changes in solvation should be taken into consideration when assessing the circular dichroism spectra of peptides expected to adopt the polyproline-II conformation. Although this precaution may complicate spectral analysis, characterization of solvent-induced spectral changes can generate new opportunities for testing the location of peptides in complex systems such as micelles or lipid bilayers.
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Affiliation(s)
- Vladimir Kubyshkin
- Department of Chemistry, University of Manitoba, 144 Dysart Rd., Winnipeg, Manitoba, R3T 2N2, Canada.
| | - Jochen Bürck
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology, POB 3640, Karlsruhe 76021, Germany
| | - Oleg Babii
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology, POB 3640, Karlsruhe 76021, Germany
| | - Nediljko Budisa
- Department of Chemistry, University of Manitoba, 144 Dysart Rd., Winnipeg, Manitoba, R3T 2N2, Canada. .,Institute of Chemistry, Technical University of Berlin, Müller-Breslau-Str. 10, Berlin 10623, Germany
| | - Anne S Ulrich
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology, POB 3640, Karlsruhe 76021, Germany.,Institute of Organic Chemistry (IOC), Karlsruhe Institute of Technology, Fritz-Haber-Weg 6, Karlsruhe 76131, Germany
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14
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Budkov YA, Victorov AI. Simple analytical theory for micelles with widespread radial distribution of charged heads. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117438] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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15
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Mirzamani M, Dawn A, Aswal VK, Jones RL, Smith ED, Kumari H. Investigating the effect of a simplified perfume accord and dilution on the formation of mixed-surfactant microemulsions. RSC Adv 2021; 11:25858-25866. [PMID: 35479452 PMCID: PMC9037075 DOI: 10.1039/d1ra03458h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Accepted: 06/29/2021] [Indexed: 02/03/2023] Open
Abstract
The phase analysis of a mixed surfactant system is much more complex than that for a single surfactant system. The addition of fragrance further enhances the complexity of such colloidal systems. The wide variation in structure and log P values of perfume raw materials influence its partitioning into the micellar phase. Herein, we have created a simplified perfume accord consisting of three perfume raw materials (3-PRM) and investigated its loading within a mixed-surfactant system consisting of sodium trideceth-2 sulfate/ST2S and cocamidopropyl betaine/CAPB, along with citric acid and dipropylene glycol. We performed a systematic phase diagram analysis and identified the isotropic phases and compositions of interest. Select compositions from the phase diagram were further investigated to learn how the geometry of the surfactant self-assembly and the localization of the PRMs within the surfactant self-assembly changed when water or perfume is added. A combined small-angle neutron scattering/SANS and NMR methodology was used to identify variation in colloidal domains and positioning of perfume molecules at varying dilutions/rinse off scenarios. The results obtained were utilized to better distinguish distorted micelles from true microemulsions. The systematic investigation here provides a fundamental understanding about the self-assembly, encapsulation and perfume release from a commercially relevant mixed surfactant system. Structural changes and phase analyses of a three-PRM accord in sodiumtrideceth-2 sulfate and cocamidopropyl betaine, citric acid and diproplylene glycol surfactant system as a function of dilution.![]()
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Affiliation(s)
- Marzieh Mirzamani
- James L. Winkle College of Pharmacy, University of Cincinnati 231 Albert Sabin Way, MSB 3109C Cincinnati OH 45267 USA
| | - Arnab Dawn
- James L. Winkle College of Pharmacy, University of Cincinnati 231 Albert Sabin Way, MSB 3109C Cincinnati OH 45267 USA
| | - Vinod K Aswal
- Solid State Physics Division, Bhabha Atomic Research Center Mumbai Maharashtra 400085 India
| | - Ronald L Jones
- NIST Center for Neutron Research, 100 Bureau Drive, National Institute of Standards and Technology Gaithersburg MD 20899 USA
| | - Ed D Smith
- Procter & Gamble Mason Montgomery Road Cincinnati OH 45040 USA
| | - Harshita Kumari
- James L. Winkle College of Pharmacy, University of Cincinnati 231 Albert Sabin Way, MSB 3109C Cincinnati OH 45267 USA
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16
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Effect of electrolytes and surfactants on generation and longevity of carbon dioxide nanobubbles. Food Chem 2021; 363:130299. [PMID: 34147892 DOI: 10.1016/j.foodchem.2021.130299] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 06/02/2021] [Accepted: 06/02/2021] [Indexed: 11/21/2022]
Abstract
The objective of this research was to investigate the effect of individual additions of mono- and divalent electrolytes (NaCl and CaCl2), anionic (sodium dodecyl sulfate, SDS) and non-ionic surfactants (polysorbate 80, Tween 80) at varied concentrations on the generation and stability of bulk nanobubbles (NBs) from carbon dioxide (CO2) gas in aqueous system. Overall, NBs generated in the small-amount salt fluids exhibited significantly (p ≤ 0.05) lower size range (150-350 nm). Smaller diameter and higher zeta potential magnitudes (18-24 mV) of the NBs in SDS medium were also observed and related to the higher CO2 concentration (~1850 ppm) and lower surface tension (~64 mN/m) of the solution. However, the gas NBs were disappeared with the incorporation of Tween 80. The outcomes provide some more research-based details about the impact of potential nano-bubble stabilising agents on characteristics of NBs contributing to the green and sustainable NB-related applications in food sectors.
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17
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Payne CD, Franke B, Fisher MF, Hajiaghaalipour F, McAleese CE, Song A, Eliasson C, Zhang J, Jayasena AS, Vadlamani G, Clark RJ, Minchin RF, Mylne JS, Rosengren KJ. A chameleonic macrocyclic peptide with drug delivery applications. Chem Sci 2021; 12:6670-6683. [PMID: 34040741 PMCID: PMC8132947 DOI: 10.1039/d1sc00692d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Accepted: 04/06/2021] [Indexed: 11/21/2022] Open
Abstract
Head-to-tail cyclized peptides are intriguing natural products with unusual properties. The PawS-Derived Peptides (PDPs) are ribosomally synthesized as part of precursors for seed storage albumins in species of the daisy family, and are post-translationally excised and cyclized during proteolytic processing. Here we report a PDP twice the typical size and with two disulfide bonds, identified from seeds of Zinnia elegans. In water, synthetic PDP-23 forms a unique dimeric structure in which two monomers containing two β-hairpins cross-clasp and enclose a hydrophobic core, creating a square prism. This dimer can be split by addition of micelles or organic solvent and in monomeric form PDP-23 adopts open or closed V-shapes, exposing different levels of hydrophobicity dependent on conditions. This chameleonic character is unusual for disulfide-rich peptides and engenders PDP-23 with potential for cell delivery and accessing novel targets. We demonstrate this by conjugating a rhodamine dye to PDP-23, creating a stable, cell-penetrating inhibitor of the P-glycoprotein drug efflux pump.
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Affiliation(s)
- Colton D Payne
- The University of Queensland, School of Biomedical Sciences Brisbane QLD 4072 Australia
| | - Bastian Franke
- The University of Queensland, School of Biomedical Sciences Brisbane QLD 4072 Australia
| | - Mark F Fisher
- The University of Western Australia, School of Molecular Sciences, The ARC Centre of Excellence in Plant Energy Biology Crawley WA 6009 Australia
| | | | - Courtney E McAleese
- The University of Queensland, School of Biomedical Sciences Brisbane QLD 4072 Australia
| | - Angela Song
- The University of Queensland, School of Biomedical Sciences Brisbane QLD 4072 Australia
| | - Carl Eliasson
- The University of Queensland, School of Biomedical Sciences Brisbane QLD 4072 Australia
| | - Jingjing Zhang
- The University of Western Australia, School of Molecular Sciences, The ARC Centre of Excellence in Plant Energy Biology Crawley WA 6009 Australia
| | - Achala S Jayasena
- The University of Western Australia, School of Molecular Sciences, The ARC Centre of Excellence in Plant Energy Biology Crawley WA 6009 Australia
| | - Grishma Vadlamani
- The University of Western Australia, School of Molecular Sciences, The ARC Centre of Excellence in Plant Energy Biology Crawley WA 6009 Australia
| | - Richard J Clark
- The University of Queensland, School of Biomedical Sciences Brisbane QLD 4072 Australia
| | - Rodney F Minchin
- The University of Queensland, School of Biomedical Sciences Brisbane QLD 4072 Australia
| | - Joshua S Mylne
- The University of Western Australia, School of Molecular Sciences, The ARC Centre of Excellence in Plant Energy Biology Crawley WA 6009 Australia
| | - K Johan Rosengren
- The University of Queensland, School of Biomedical Sciences Brisbane QLD 4072 Australia
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18
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Rodina AA, Yapryntsev AD, Churakov AV, Baranchikov AE. Layered Rare Earth Hydroxides React with Formamide to Give [Ln(HCOO)3 · 2(HCONH2)]. RUSS J INORG CHEM+ 2021. [DOI: 10.1134/s0036023621020169] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Abbasian Chaleshtari Z, Salimi-Kenari H, Foudazi R. Interdroplet Interactions and Rheology of Concentrated Nanoemulsions for Templating Porous Polymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:76-89. [PMID: 33337881 DOI: 10.1021/acs.langmuir.0c02366] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In the current study, we investigate the colloidal behavior of nanoemulsions over a wide range of oil volume fractions (φ) from dilute to concentrated regime. The dilute system contains 25% silicone oil dispersed in the aqueous phase consisting of poly(ethylene glycol)-diacrylate (PEGDA) and sodium dodecyl sulfate (SDS), which is concentrated through evaporation of water at two different rates at ambient temperature. The rheological studies show that the liquid-like nanoemulsions transform into viscoelastic gels at a volume fraction of ∼30%. The plateau storage modulus of the nanoemulsions increases in the semidilute systems (φ below 45%) and then decreases steadily with increasing φ up to 60%. Dependency of the modulus on the evaporation rate can be observed in the rheological results. According to the rheological results and the overall pairwise interactions estimated between droplets, we propose two regimes of colloidal interactions. In the semidilute regime, the attractive gelation occurs due to considerable short-range attractive depletion induced by the PEGDA oligomer and SDS micelles. In the concentrated regime, the gel weakens by increasing φ mainly due to the structural stabilization barrier from a high concentration of micelles. The PEGDA in the continuous phase of the nanoemulsions can be crosslinked through photopolymerization, resulting in nanoporous PEGDA hydrogels upon removal of oil droplets. We study the water uptake of the nanoporous hydrogels prepared from the nanoemulsion templates at φ = 60%. The hydrogel obtained from the nanoemulsion with fast evaporation rate shows higher water uptake than that obtained from the slowly concentrated nanoemulsion. The tunable viscoelastic behavior of concentrated nanoemulsions as well as the resulting nanoporous hydrogels offers a new platform to design the soft materials for a wide range of applications.
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Affiliation(s)
- Zahra Abbasian Chaleshtari
- Department of Chemical and Materials Engineering, New Mexico State University, Las Cruces, New Mexico 88003, United States
| | - Hamed Salimi-Kenari
- Department of Chemical and Materials Engineering, New Mexico State University, Las Cruces, New Mexico 88003, United States
- Faculty of Engineering & Technology, University of Mazandaran, Babolsar 47416-13534, Iran
| | - Reza Foudazi
- Department of Chemical and Materials Engineering, New Mexico State University, Las Cruces, New Mexico 88003, United States
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20
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Phan AHT, Le KCM, Le TH, Nguyen AV, Nguyen KT. Evidence of surfactant sub-monolayer adsorption at the air/water interface provided by laser scattering measurements of ultrafine gas bubbles. NEW J CHEM 2021. [DOI: 10.1039/d1nj02802b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
As the SDS concentration increases in bubble rich solutions, the surfactant layer alters its size and refractive index. The scattered light enhancement and SFG signal cancellation prove that sub-monolayer adsorption exists at the air/water interface.
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Affiliation(s)
- An Hoang Thien Phan
- School of Biotechnology
- International University
- Vietnam National University
- Ho Chi Minh City
- Vietnam
| | - Khoa Cong Minh Le
- School of Biotechnology
- International University
- Vietnam National University
- Ho Chi Minh City
- Vietnam
| | - Thi Ho Le
- School of Biotechnology
- International University
- Vietnam National University
- Ho Chi Minh City
- Vietnam
| | - Anh Van Nguyen
- School of Chemical Engineering
- The University of Queensland
- Brisbane
- Australia
| | - Khoi Tan Nguyen
- School of Biotechnology
- International University
- Vietnam National University
- Ho Chi Minh City
- Vietnam
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21
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Grist SM, Mourdoukoutas AP, Herr AE. 3D projection electrophoresis for single-cell immunoblotting. Nat Commun 2020; 11:6237. [PMID: 33277486 PMCID: PMC7718224 DOI: 10.1038/s41467-020-19738-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 10/20/2020] [Indexed: 12/21/2022] Open
Abstract
Immunoassays and mass spectrometry are powerful single-cell protein analysis tools; however, interfacing and throughput bottlenecks remain. Here, we introduce three-dimensional single-cell immunoblots to detect both cytosolic and nuclear proteins. The 3D microfluidic device is a photoactive polyacrylamide gel with a microwell array-patterned face (xy) for cell isolation and lysis. Single-cell lysate in each microwell is “electrophoretically projected” into the 3rd dimension (z-axis), separated by size, and photo-captured in the gel for immunoprobing and confocal/light-sheet imaging. Design and analysis are informed by the physics of 3D diffusion. Electrophoresis throughput is > 2.5 cells/s (70× faster than published serial sampling), with 25 immunoblots/mm2 device area (>10× increase over previous immunoblots). The 3D microdevice design synchronizes analyses of hundreds of cells, compared to status quo serial analyses that impart hours-long delay between the first and last cells. Here, we introduce projection electrophoresis to augment the heavily genomic and transcriptomic single-cell atlases with protein-level profiling. Single-cell immunoblotting previously separated proteins on a polyacrylamide slab in the xy direction and was limited by throughput and sample consumption. Here the authors adapt the system to separate proteins in the z direction, allowing for closer spacing of sample wells and improved sample consumption.
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Affiliation(s)
- Samantha M Grist
- Department of Bioengineering, University of California, Berkeley, USA
| | - Andoni P Mourdoukoutas
- Department of Bioengineering, University of California, Berkeley, USA.,UC Berkeley - UCSF Graduate Program in Bioengineering, Berkeley, USA
| | - Amy E Herr
- Department of Bioengineering, University of California, Berkeley, USA. .,UC Berkeley - UCSF Graduate Program in Bioengineering, Berkeley, USA. .,Chan Zuckerberg Biohub, San Francisco, CA, USA.
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22
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Edwardson TGW, Tetter S, Hilvert D. Two-tier supramolecular encapsulation of small molecules in a protein cage. Nat Commun 2020; 11:5410. [PMID: 33106476 PMCID: PMC7588467 DOI: 10.1038/s41467-020-19112-1] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 09/15/2020] [Indexed: 12/11/2022] Open
Abstract
Expanding protein design to include other molecular building blocks has the potential to increase structural complexity and practical utility. Nature often employs hybrid systems, such as clathrin-coated vesicles, lipid droplets, and lipoproteins, which combine biopolymers and lipids to transport a broader range of cargo molecules. To recapitulate the structure and function of such composite compartments, we devised a supramolecular strategy that enables porous protein cages to encapsulate poorly water-soluble small molecule cargo through templated formation of a hydrophobic surfactant-based core. These lipoprotein-like complexes protect their cargo from sequestration by serum proteins and enhance the cellular uptake of fluorescent probes and cytotoxic drugs. This design concept could be applied to other protein cages, surfactant mixtures, and cargo molecules to generate unique hybrid architectures and functional capabilities.
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Affiliation(s)
| | - Stephan Tetter
- Laboratory of Organic Chemistry, ETH Zurich, 8093, Zurich, Switzerland
| | - Donald Hilvert
- Laboratory of Organic Chemistry, ETH Zurich, 8093, Zurich, Switzerland.
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23
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Arce FA, Setiawan N, Campbell HR, Lu X, Nethercott MJ, Bummer P, Su Y, Marsac PJ. Toward Developing Discriminating Dissolution Methods for Formulations Containing Nanoparticulates in Solution: The Impact of Particle Drift and Drug Activity in Solution. Mol Pharm 2020; 17:4125-4140. [PMID: 32965123 DOI: 10.1021/acs.molpharmaceut.0c00599] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Enabling formulations are an attractive approach to increase the dissolution rate, solubility, and oral bioavailability of poorly soluble compounds. With the growing prevalence of poorly soluble drug compounds in the pharmaceutical pipeline, supersaturating drug delivery systems (SDDS), a subset of enabling formulations, have grown in popularity due to their properties allowing for drug concentrations greater than the corresponding crystalline solubility. However, the extent of supersaturation generated as the enabling formulation traverses the gastrointestinal (GI) tract is dynamic and poorly understood. The dynamic nature of supersaturation is a result of several competing kinetic processes such as dissolution, solubilization by formulation and endogenous surfactants, crystallization, and absorption. Ultimately, the free drug concentration, which is equivalent to the drug's inherent thermodynamic activity amid these kinetic processes, defines the true driving force for drug absorption. However, in cases where solubilizing agents are present (i.e., surfactants and bile salts), drug molecules may associate with colloidal nanoscale species, complicating drug activity determination. These nanoscale species can drift into the aqueous boundary layer (ABL), increasing the local API activity at the membrane surface, resulting in increased bioavailability. Herein, a novel approach was developed to accurately measure thermodynamic drug activity in complex media containing drug distributed in nanoparticulate species. This approach captures the influence of the ABL on the observed flux and, ultimately, the predicted unbound drug concentration. The results demonstrate that this approach can help to (1) measure the true extent of local supersaturation in complex systems containing solubilizing excipients and (2) elucidate the mechanisms by which colloidal aggregates can modulate the drug activity in solution and potentially enhance the flux observed across a membrane. The utilization of these techniques may provide development scientists with a strategy to evaluate formulation sensitivity to nanospeciation and allow formulators to maximize the driving force for absorption in a complex environment, perhaps enabling the development of dissolution methods with greater discrimination and correlation to pre-clinical and clinical data sets.
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Affiliation(s)
- Freddy A Arce
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, Kentucky 40536, United States
| | - Nico Setiawan
- Albany Molecular Research Inc., West Lafayette, Indiana 47906, United States
| | - Heather R Campbell
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, Kentucky 40536, United States
| | - Xingyu Lu
- Pharmaceutical Sciences, Merck & Co., Kenilworth, New Jersey 07033, United States.,Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province, School of Science, Westlake University, Hangzhou, Zhejiang 310024, China
| | | | - Paul Bummer
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, Kentucky 40536, United States
| | - Yongchao Su
- Pharmaceutical Sciences, Merck & Co., Kenilworth, New Jersey 07033, United States.,Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, Austin, Texas 78712, United States.,Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, United States
| | - Patrick J Marsac
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, Lexington, Kentucky 40536, United States
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24
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Revision of the calibration experiment in asymmetrical flow field-flow fractionation. J Chromatogr A 2020; 1635:461631. [PMID: 33260023 DOI: 10.1016/j.chroma.2020.461631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 10/13/2020] [Accepted: 10/15/2020] [Indexed: 11/23/2022]
Abstract
Asymmetrical flow field-flow fractionation is a versatile chromatographic fractionation method. In combination with at least one detection technique it is used for size-based separation of colloids, biomolecules and polymers. Although often used as pure separation method, a well-elaborated theory is available that allows precise quantification of the translational diffusion coefficient D. Still, current literature suggests different ways to transform this theory into applicable experimental procedures and no "gold standard" for correct data processing exists. While some sources report a direct way to extract diffusion information from the fractogram, others suggest the necessity of an external calibration measurement to obtain the channel width w. In this work, we compare the different approaches and calibration algorithms based on original and literature data using our own open-source AF4 evaluation software. Based on the results, we conclude that available AF4 setups do not fulfill the requirements for absolute measurements of D. We show that the best way to conduct is to consider the area of the channel and D of the calibrant while neglecting the small peak which occurs in the void peak region.
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25
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Kuchibhotla A, Chakraborty S, Banerjee D. Experimental validation of numerical predictions for “Deviant” density enhancement of protein emulsions in oil (Oleo-Nanofluids). SN APPLIED SCIENCES 2020. [DOI: 10.1007/s42452-020-03422-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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26
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Kovács A, Kazsoki A, Démuth B, Szirányi B, Madarász J, Süvegh K, Zelkó R. Influence of Aqueous Solubility-Enhancing Excipients on the Microstructural Characteristics of Furosemide-Loaded Electrospun Nanofibers. Pharmaceutics 2020; 12:pharmaceutics12040385. [PMID: 32340196 PMCID: PMC7238267 DOI: 10.3390/pharmaceutics12040385] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Accepted: 04/21/2020] [Indexed: 11/19/2022] Open
Abstract
Electrospun nanofibers were prepared from furosemide-containing hydroxypropyl cellulose and poly(vinylpyrrolidone) aqueous solutions using different solubility enhancers. In one case, a solubilizer, triethanolamine, was applied, while in the other case a pH-modifier, sodium hydroxide, was applied. Scanning electron microscopy (SEM) was carried out for morphological characterization of the fibers. The SEM images indicated similar mean diameter size of the two fibrous formulations. However, in contrast to the NaOH-containing fibers of normal diameter distribution, the triethanolamine-containing fibers showed approximately normal diameter distribution, possibly due to their plasticizing effect and the consequent slightly ribbon-like morphology. Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), powder X-ray diffraction (XRD) and positron annihilation lifetime spectroscopy (PALS) were applied for microstructural characterization. The FTIR measurements confirmed that furosemide salt was formed in both cases. There was no sign of any crystallinity based on the XRD measurements. However, the PALS highlighted the differences in the average o-Ps lifetime values and distributions of the furosemide-loaded fibrous formulations. The two types of electrospun nanofibrous formulations containing amorphous furosemide salt showed similar macrostructures but different microstructural characteristics depending on the type of solubility enhancers, which lead to altered storage stability.
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Affiliation(s)
- Andrea Kovács
- Gedeon Richter Plc., Formulation R&D, Gyömrői Street 19-21, H-1103 Budapest, Hungary; (A.K.); (B.D.); (B.S.)
- University Pharmacy Department of Pharmacy Administration, Semmelweis University, Hőgyes Endre Street 7-9, H-1092 Budapest, Hungary;
| | - Adrienn Kazsoki
- University Pharmacy Department of Pharmacy Administration, Semmelweis University, Hőgyes Endre Street 7-9, H-1092 Budapest, Hungary;
| | - Balázs Démuth
- Gedeon Richter Plc., Formulation R&D, Gyömrői Street 19-21, H-1103 Budapest, Hungary; (A.K.); (B.D.); (B.S.)
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budafoki út 8. 3, H-1103 Budapest, Hungary
| | - Bernadett Szirányi
- Gedeon Richter Plc., Formulation R&D, Gyömrői Street 19-21, H-1103 Budapest, Hungary; (A.K.); (B.D.); (B.S.)
| | - János Madarász
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary;
| | - Károly Süvegh
- Laboratory of Nuclear Chemistry, Eötvös Loránd University/HAS Chemical Research Center, P.O. Box 32, H-1518 Budapest, Hungary;
| | - Romána Zelkó
- University Pharmacy Department of Pharmacy Administration, Semmelweis University, Hőgyes Endre Street 7-9, H-1092 Budapest, Hungary;
- Correspondence: ; Tel.: +36-1-217-0927
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27
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Cheng LC, Kuei Vehusheia SL, Doyle PS. Tuning Material Properties of Nanoemulsion Gels by Sequentially Screening Electrostatic Repulsions and Then Thermally Inducing Droplet Bridging. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:3346-3355. [PMID: 32216359 PMCID: PMC7311086 DOI: 10.1021/acs.langmuir.0c00199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 03/17/2020] [Indexed: 06/10/2023]
Abstract
Nanoemulsions are widely used in applications such as food products, cosmetics, pharmaceuticals, and enhanced oil recovery for which the ability to engineer material properties is desirable. Moreover, nanoemulsions are emergent model colloidal systems because of the ease in synthesizing monodisperse samples, flexibility in formulations, and tunable material properties. In this work, we study a nanoemulsion system previously developed by our group in which gelation occurs through thermally induced polymer bridging of droplets. We show here that the same system can undergo a sol-gel transition at room temperature through the addition of salt, which screens the electrostatic interaction and allows the system to assemble via depletion attraction. We systematically study how the addition of salt followed by a temperature jump can influence the resulting microstructures and rheological properties of the nanoemulsion system. We show that the salt-induced gel at room temperature can dramatically restructure when the temperature is suddenly increased and achieves a different gelled state. Our results offer a route to control the material properties of an attractive colloidal system by carefully tuning the interparticle potentials and sequentially triggering the colloidal self-assembly. The control and understanding of the material properties can be used for designing hierarchically structured hydrogels and complex colloid-based materials for advanced applications.
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Affiliation(s)
- Li-Chiun Cheng
- Department
of Chemical Engineering, Massachusetts Institute
of Technology, Cambridge, Massachusetts 02139, United States
| | | | - Patrick S. Doyle
- Department
of Chemical Engineering, Massachusetts Institute
of Technology, Cambridge, Massachusetts 02139, United States
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28
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Golovkova I, Montel L, Wandersman E, Bertrand T, Prevost AM, Pontani LL. Depletion attraction impairs the plasticity of emulsions flowing in a constriction. SOFT MATTER 2020; 16:3294-3302. [PMID: 32173724 DOI: 10.1039/c9sm02343g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We study the elasto-plastic behavior of dense attractive emulsions under a mechanical perturbation. The attraction is introduced through non-specific depletion interactions between the droplets and is controlled by changing the concentration of surfactant micelles in the continuous phase. We find that such attractive forces are not sufficient to induce any measurable modification on the scalings between the local packing fraction and the deformation of the droplets. However, when the emulsions are flowed through 2D microfluidic constrictions, we uncover a measurable effect of attraction on their elasto-plastic response. Indeed, we measure higher levels of deformation inside the constriction for attractive droplets. In addition, we show that these measurements correlate with droplet rearrangements that are spatially delayed in the constriction for higher attraction forces.
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Affiliation(s)
- Iaroslava Golovkova
- Sorbonne Université, CNRS, Institut de Biologie Paris-Seine (IBPS), Laboratoire Jean Perrin (LJP), F-75005, Paris, France.
| | - Lorraine Montel
- Sorbonne Université, CNRS, Institut de Biologie Paris-Seine (IBPS), Laboratoire Jean Perrin (LJP), F-75005, Paris, France.
| | - Elie Wandersman
- Sorbonne Université, CNRS, Institut de Biologie Paris-Seine (IBPS), Laboratoire Jean Perrin (LJP), F-75005, Paris, France.
| | - Thibault Bertrand
- Department of Mathematics, Imperial College London, South Kensington Campus, London SW7 2AZ, UK.
| | - Alexis Michel Prevost
- Sorbonne Université, CNRS, Institut de Biologie Paris-Seine (IBPS), Laboratoire Jean Perrin (LJP), F-75005, Paris, France.
| | - Lea-Laetitia Pontani
- Sorbonne Université, CNRS, Institut de Biologie Paris-Seine (IBPS), Laboratoire Jean Perrin (LJP), F-75005, Paris, France.
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29
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Ghosh A, Kanti Seth S, Purkayastha P. Controlled Formation of Hydrated Micelles by the Intervention of Cyclodextrins. Chempluschem 2020; 84:130-135. [PMID: 31950737 DOI: 10.1002/cplu.201800559] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 12/17/2018] [Indexed: 11/08/2022]
Abstract
The interaction between surfactants and cyclodextrins (CDs) is well known. Studies have focused mainly on destruction of micelles with CDs to release the encapsulated drugs. However, less emphasis has been given on understanding the formation of micelles with the CD encapsulated surfactants. We have used fluorescence spectroscopy to study the impact of CDs on micelles using a fluorophore that has been tactically designed as a reporter. This molecule has a pyrene moiety on one end and a cationic head group on the other so that the orientation of the compound can be prefixed on micelle formation in aqueous environment. We have observed that the CD encapsulated surfactants can form "hydrated micelles" that allow extensive penetration of water molecules toward the core. The mechanism for such a process involves inclusion of the hydrophobic surfactant tails within the CD core and participation of these inclusion complexes in micelle formation. The process could be controlled by tuning the concentration of CD. The degree of hydration varies as the micelles get more opened up due to the residence of the CDs inside them.
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Affiliation(s)
- Ashutosh Ghosh
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, WB 741246, India
| | - Sourav Kanti Seth
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, WB 741246, India
| | - Pradipta Purkayastha
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, WB 741246, India
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Das T, Acosta D, Eliezer D. Interactions of IDPs with Membranes Using Dark-State Exchange NMR Spectroscopy. Methods Mol Biol 2020; 2141:585-608. [PMID: 32696379 PMCID: PMC8185907 DOI: 10.1007/978-1-0716-0524-0_30] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Membrane interactions of proteins play a role in essential cellular processes in both physiological and disease states. The structural flexibility of intrinsically disordered proteins (IDPs) allows for interactions with multiple partners, including membranes. However, determining conformational states of IDPs when interacting with membranes can be challenging. Here we describe the use of nuclear magnetic resonance (NMR), including dark-state exchange saturation transfer (DEST), to probe IDP-membrane interactions in order to determine whether there is an interaction, which residues participate, and the extent/nature of the interaction between the protein and the membrane. Using α-synuclein and tau as typical examples, we provide protocols for how the membrane interactions of IDPs can be probed, including details of how the samples should be prepared and guidelines on how to interpret the results.
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Affiliation(s)
- Tapojyoti Das
- Department of Biochemistry, Weill Cornell Medical College of Cornell University, New York, NY, USA
- Brain and Mind Research Institute,, Weill Cornell Medical College of Cornell University, New York, NY, USA
| | - Diana Acosta
- Department of Biochemistry, Weill Cornell Medical College of Cornell University, New York, NY, USA
- Brain and Mind Research Institute,, Weill Cornell Medical College of Cornell University, New York, NY, USA
| | - David Eliezer
- Department of Biochemistry, Weill Cornell Medical College of Cornell University, New York, NY, USA.
- Brain and Mind Research Institute,, Weill Cornell Medical College of Cornell University, New York, NY, USA.
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31
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Cheng LC, Sherman ZM, Swan JW, Doyle PS. Colloidal Gelation through Thermally Triggered Surfactant Displacement. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9464-9473. [PMID: 31298032 DOI: 10.1021/acs.langmuir.9b00596] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Colloidal systems that undergo gelation attract much attention in both fundamental studies and practical applications. Rational tuning of interparticle interactions allows researchers to precisely engineer colloidal material properties and microstructures. Here, contrary to the traditional approaches where modulating attractive interactions is the major focus, we present a platform wherein colloidal gelation is controlled by tuning repulsive interactions. By including amphiphilic oligomers in colloidal suspensions, the ionic surfactants on the colloids are replaced by the nonionic oligomer surfactants at elevated temperatures, leading to a decrease in electrostatic repulsion. The mechanism is examined by carefully characterizing the colloids, and subsequently allowing the construction of interparticle potentials to capture the material behaviors. With the thermally triggered surfactant displacement, the dispersion assembles into a macroporous viscoelastic network and the gelling mechanism is robust over a wide range of compositions, colloid sizes, and component chemistries. This stimulus-responsive gelation platform is general and offers new strategies to engineer complex viscoelastic soft materials.
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Affiliation(s)
- Li-Chiun Cheng
- Department of Chemical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Zachary M Sherman
- Department of Chemical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - James W Swan
- Department of Chemical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Patrick S Doyle
- Department of Chemical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
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32
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Critical micelle concentration, composition and thermodynamic properties of n-octyl-β-d-glucopyranoside and sodium dodecylsulfate mixed micelles. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.04.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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33
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Feng H, Wong TN. Net fluid flow and non-Newtonian effect in induced-charge electro-osmosis of polyelectrolyte solutions. Phys Rev E 2019; 100:013105. [PMID: 31499862 DOI: 10.1103/physreve.100.013105] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Indexed: 06/10/2023]
Abstract
This paper reports an interesting net fluid flow in the induced-charge electro-osmosis (ICEO) of poly(sodium 4-styrenesulfonate) (NaPSS) solutions measured through microparticle image velocimetry (μPIV). The net fluid flow is attributed to the significantly unequal cations and poly-anions of NaPSS. Owing to the phase delay effect of ions, different flow patterns appear with the alternating electric field. The inflow velocity and outflow velocity are found to be unequal and their relative magnitude shows a dependence on the electric field strength. The ICEO velocity is positively correlated with the NaPSS concentration. As NaPSS introduces the non-Newtonian effect, the well-known quadratic relationship between ICEO velocity and electric field strength in Newtonian fluids breaks. The ICEO velocity varies differently with the electric field strength as the NaPSS concentration changes. These new findings can contribute to the understanding of ICEO of complex fluids, e.g., biofluids.
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Affiliation(s)
- Huicheng Feng
- Unmanned System Research Institute, Northwestern Polytechnical University, Xi'an 710072, China
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Teck Neng Wong
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
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34
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Binks BP, Shi H. Phase Inversion of Silica Particle-Stabilized Water-in-Water Emulsions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:4046-4057. [PMID: 30848921 DOI: 10.1021/acs.langmuir.8b04151] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
An aqueous two-phase system (ATPS) is of great value in low calorie foods or oil-free cosmetics and pharmaceuticals. In contrast to the recent work on polymer/polymer ATPSs, a simple polymer/salt ATPS (polyethylene glycol/Na2SO4) was chosen to study water-in-water (w/w) emulsions stabilized by solid particles. The binodal curve and the tie lines were first determined for the mixture at room temperature. Above the binodal curve, two water-based phases coexist; the upper phase is rich in polymer, whereas the lower phase is rich in salt. Within the two-phase region, we attempted to prepare w/w emulsions with or without the addition of common emulsifiers. Ionic and nonionic surfactants, a polymer, and various solid particles (hydrophilic calcium carbonate particles of different sizes and shapes, wax microspheres) were selected, but no stable emulsion was possible. However, stable w/w emulsions of both types (polymer-in-salt and salt-in-polymer) were formed using dichlorodimethylsilane-modified nanosilica particles. Using partially hydrophobic fumed silica as the emulsifier, emulsions remained fully emulsified for over 1 year and we link the extent of hydrophobization of particles to the properties of the emulsions via contact angle measurements. Furthermore, systematic emulsion studies were conducted at different overall compositions such that changes in emulsion type and stability were mapped onto the phase diagram. Catastrophic phase inversion of emulsion type and evolution of emulsion stability were monitored along the tie lines. Importantly, stability to coalescence was found to decrease approaching conditions of phase inversion.
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Affiliation(s)
- Bernard P Binks
- Department of Chemistry and Biochemistry , University of Hull , Hull HU6 7RX . U.K
| | - Hui Shi
- Department of Chemistry and Biochemistry , University of Hull , Hull HU6 7RX . U.K
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SDS-induced oligomerization of Lys49-phospholipase A 2 from snake venom. Sci Rep 2019; 9:2330. [PMID: 30787342 PMCID: PMC6382788 DOI: 10.1038/s41598-019-38861-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 01/08/2019] [Indexed: 11/21/2022] Open
Abstract
Phospholipase A2 (PLA2) is one of the representative toxic components of snake venom. PLA2s are categorized into several subgroups according to the amino acid at position 49, which comprises either Asp49, Lys49, Arg49 or Ser49. Previous studies suggested that the Lys49-PLA2 assembles into an extremely stable dimer. Although the behavior on Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) under reducing or non-reducing conditions suggested the presence of intermolecular disulfide bonds, these bonds were not observed in the crystal structure of Lys49-PLA2. The reason for this discrepancy between the crystal structure and SDS-PAGE of Lys49-PLA2 remains unknown. In this study, we analyzed a Lys49-PLA2 homologue from Protobothrops flavoviridis (PflLys49-PLA2 BPII), by biophysical analyses including X-ray crystallography, SDS-PAGE, native-mass spectrometry, and analytical ultracentrifugation. The results demonstrated that PflLys49-PLA2 BPII spontaneously oligomerized in the presence of SDS, which is one of the strongest protein denaturants.
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36
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Răducan A, Puiu M, Oancea P, Colbea C, Velea A, Dinu B, Mihăilescu AM, Galaon T. Fast decolourization of Indigo Carmine and Crystal Violet in aqueous environments through micellar catalysis. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.08.052] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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37
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Dey J, Ghosh R, Das Mahapatra R. Self-Assembly of Unconventional Low-Molecular-Mass Amphiphiles Containing a PEG Chain. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:848-861. [PMID: 29923405 DOI: 10.1021/acs.langmuir.8b00779] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The design and synthesis of biocompatible surfactants are important for a wide range of applications in cosmetics, personal care products, and nanomedicine. This feature article summarizes our studies over the past 8 years on the design, synthesis, surface activity, and self-assembly of a series of unconventional low-molecular-mass amphiphiles containing a poly(ethylene glycol) (PEG) tail or spacer and different ionic or zwitterionic headgroups, including carboxylate, sulfonate, and quaternary ammonium salts. Despite having a so-called polar PEG chain as a tail or spacer, these ionic amphiphiles are found to have a tendency to adsorb at the air/water interface and self-assemble in pH 7.0 buffers at 298 K in the same way that conventional hydrocarbon tail surfactants do. However, they are observed to be relatively less surface-active compared to hydrocarbon tail surfactants. Although these amphiphilic molecules have less surface activity, they do self-assemble in aqueous buffer at 298 K, producing a range of microstructures, including spherical micelles, disclike micelles, and vesicles. In fact, our group is the first to report the self-assembly of PEG-tailed ionic amphiphiles in water at room temperature. Some of these molecules are also found to gel various organic liquids on heat-cool treatment or by ultrasound irradiation. We think that the present article will arouse general interest among researchers working toward the development of new biocompatible amphiphiles and soft materials.
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Affiliation(s)
- Joykrishna Dey
- Department of Chemistry , Indian Institute of Technology Kharagpur , Kharagpur 721302 , India
| | - Rita Ghosh
- Department of Chemistry , Indian Institute of Technology Kharagpur , Kharagpur 721302 , India
| | - Rita Das Mahapatra
- Department of Chemistry , Indian Institute of Technology Kharagpur , Kharagpur 721302 , India
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38
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Verma A, Prasad NE, Srivastava J, Saha S. Probing the Heterogeneity of Ionic Liquids in Solution through Phenol-Water Phase Behavior. ChemistrySelect 2019. [DOI: 10.1002/slct.201803114] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Abhineet Verma
- Dept. of Chemistry; Institute of Science; Banaras Hindu University; Varanasi 221005 India
| | - Namburi Eswara Prasad
- Defence Materials and Stores Research and Development Establishment (DMSRDE); Kanpur India
| | - Jyoti Srivastava
- Defence Materials and Stores Research and Development Establishment (DMSRDE); Kanpur India
| | - Satyen Saha
- Dept. of Chemistry; Institute of Science; Banaras Hindu University; Varanasi 221005 India
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39
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Das T, Eliezer D. Probing Structural Changes in Alpha-Synuclein by Nuclear Magnetic Resonance Spectroscopy. Methods Mol Biol 2019; 1948:157-181. [PMID: 30771177 PMCID: PMC8193918 DOI: 10.1007/978-1-4939-9124-2_13] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Alpha-synuclein, the principal protein involved in the pathogenesis of Parkinson's disease, has been shown to exchange between multiple conformational states, with hitherto unclear physiological role of such conformational changes. Due to its ability to provide rich structural information for proteins in their near-native environment, nuclear magnetic resonance (NMR) spectroscopy has been a valuable tool to study these conformational states. In this review we describe the application of model systems and NMR methods to the study of membrane-bound states of alpha-synuclein. We provide a detailed description, primarily meant for someone new to the field, of how to prepare the necessary samples, perform the basic experiments, and obtain an initial interpretation of the results.
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40
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Nirmalkar N, Pacek AW, Barigou M. Interpreting the interfacial and colloidal stability of bulk nanobubbles. SOFT MATTER 2018; 14:9643-9656. [PMID: 30457138 DOI: 10.1039/c8sm01949e] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This paper elucidates parts of the mystery behind the interfacial and colloidal stability of the novel bubble system of bulk nanobubbles. Stable bulk nanobubble suspensions have been generated in pure water using hydrodynamic cavitation in a high-pressure microfluidic device. The effects of pH adjustment, addition of different types of surfactant molecules and salts on the nanobubble suspensions have been studied. Results show that nanobubble interfaces in pure water are negatively charged, suggesting the formation of an electric double layer around the nanobubbles. It is presumed that the external electrostatic pressure created by the charged nanobubble interface, balances the internal Laplace pressure; therefore, no net diffusion of gas occurs at equilibrium and the nanobubbles are stable. Such stability increases with increasing alkalinity of the suspending medium. The addition of mono- and multi-valent salts leads to the screening of the electric double layer, hence, destabilizing the nanobubbles. Different surfactant molecules (non-ionic, anionic, cationic) affect the stability of bulk nanobubbles in different ways. Calculations based on the DLVO theory predict a stable colloidal system for bulk nanobubbles in pure water and this could be a further reason for their observed longevity. All in all, in pure water, the long-term stability of bulk nanobubbles seems to be caused by a combination of ion-stabilisation of their interface against dissolution and colloidal stability of the suspension.
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Affiliation(s)
- N Nirmalkar
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
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41
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Yamaguchi S, Minbuta S, Matsui K. Rhodamine B adsorption on anodic porous alumina in sodium dodecyl sulfate solutions. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.06.079] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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42
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Nirmalkar N, Pacek AW, Barigou M. On the Existence and Stability of Bulk Nanobubbles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:10964-10973. [PMID: 30179016 DOI: 10.1021/acs.langmuir.8b01163] [Citation(s) in RCA: 169] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Bulk nanobubbles are a novel type of nanoscale bubble system. Because of their extraordinary behavior, however, their existence is not widely accepted. In this paper, we shed light on the hypothesis that bulk nanobubbles do exist, they are filled with gas, and they survive for long periods of time, challenging present theories. An acoustic cavitation technique has been used to produce bulk nanobubbles in pure water in relatively large numbers approaching 109 bubble·mL-1 with a typical diameter of 100-120 nm. We provide multiple evidence that the nanoentities observed in suspension are nanobubbles given that they disappear after freezing and thawing of the suspensions, their nucleation rate depends strongly on the amount of air dissolved in water, and they gradually disappear over time. The bulk nanobubble suspensions were stable over periods of many months during which time the mean diameter remained unchanged, suggesting the absence of significant bubble coalescence, bubble breakage, or Ostwald ripening effects. Measurements suggest that these nanobubbles are negatively charged and their zeta potential does not vary over time. The presence of such a constant charge on the nanobubble surfaces is probably responsible for their stability. The effects of pH, salt, and surfactant addition on their colloidal stability are similar to those reported in the literature for solid nanoparticle suspensions, that is, nanobubbles are more stable in an alkaline medium than in an acidic one; the addition of salt to a nanobubble suspension drives the negative zeta potential toward zero, thus reducing the repulsive electrostatic forces between nanobubbles; and the addition of an anionic surfactant increases the magnitude of the negative zeta potential, thus improving nanobubble electrostatic stabilization.
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Affiliation(s)
- N Nirmalkar
- School of Chemical Engineering , University of Birmingham , Edgbaston , Birmingham B15 2TT , U.K
| | - A W Pacek
- School of Chemical Engineering , University of Birmingham , Edgbaston , Birmingham B15 2TT , U.K
| | - M Barigou
- School of Chemical Engineering , University of Birmingham , Edgbaston , Birmingham B15 2TT , U.K
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43
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Pagenkopp MJ, Mason TG. Surfactant Partitioning in Nanoemulsions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:10309-10320. [PMID: 30048593 DOI: 10.1021/acs.langmuir.8b01099] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Using a fractionated silicone oil-in-water nanoemulsion (NEM), which has a high ratio of surface area-to-volume, we investigate surfactant partitioning between the bulk continuous phase and the adsorbed interfacial phase. By adjusting the droplet volume fraction of this fractionated NEM and by using gravimetric and electrical conductivity methods, we measure the bulk and the surface concentrations of an ionic surfactant (sodium dodecyl sulfate, SDS), thereby obtaining a raw adsorption isotherm of SDS on the interfaces of the nanodroplets. To overcome significant uncertainties in the total surface area of this nanoemulsion, we have also measured the macroscopic interfacial tension (IFT) of silicone oil in contact with aqueous SDS solutions using the du Noüy ring method. We then scale the surface concentration of this raw isotherm using an appropriate Gibbs derivative based on the IFT measurement, yielding an adjusted isotherm. We show that this adjusted isotherm can be described using a simple Langmuir equation. In addition, we show that a significant and non-negligible percentage of surfactant typically partitions to nanodroplet interfaces after high-flow-rate emulsification (HFRE) has transformed a microscale premix emulsion into a NEM. We develop a model for predicting the final bulk surfactant concentration after HFRE given the initial bulk surfactant concentration before HFRE. We show that this model can be used to predict trends for surfactant partitioning in polydisperse nanoemulsions after HFRE.
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44
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Solvation dynamics in SDS micelle revisited with femtosecond time resolution to reveal the probe and concentration dependence. Chem Phys 2018. [DOI: 10.1016/j.chemphys.2018.07.034] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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45
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Aufderhorst-Roberts A, Baker D, Foster RJ, Cayre O, Mattsson J, Connell SD. Nanoscale mechanics of microgel particles. NANOSCALE 2018; 10:16050-16061. [PMID: 30106410 DOI: 10.1039/c8nr02911c] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Microgel particles are highly tuneable materials that are useful for a wide range of industrial applications, such as drug delivery, sensing, nanoactuation, emulsion stabilisation and use as cell substrates. Microgels have also been used as model systems investigating physical phenomena such as crystallization, glass-formation, jamming, ageing and complex flow behaviour. The responsiveness of microgel systems such as poly(N-isopropylacrylamide) (PNIPAm) to external stimuli has been established in fundamental investigations and in applications and recent work has begun to quantify the mechanics of individual particles. However little focus has been placed on determining their internal mechanical properties, which is likely to relate to their nonuniform internal structure. In this work we combine atomic force microscopy, force spectroscopy and dynamic light scattering to mechanically profile the internal structure of microgel particles in the size range of ∼100 nm, which is commonly used both in practical applications and in fundamental studies. Nanoindentation using thermally stable cantilevers allows us to determine the particle moduli and the deformation profiles during particle compression with increasing force, while peak force nanomechanical mapping (PF-QNM) AFM is used to capture high resolution images of the particles' mechanical response. Combining these approaches with dynamic light scattering allows a quantitative profile of the particles' internal elastic response to be determined. Our results provide clear evidence for a radial distribution in particle mechanical response with a softer outer "corona" and a stiffer particle core. We determine the particle moduli in the core and corona, using different force microscopy approaches, and find them to vary systematically both in the core (∼17-50 kPa) and at the outer periphery of the particles (∼3-40 kPa). Importantly, we find that highly crosslinked particles have equivalent moduli across their radial profile, reflecting their significantly lower radial heterogeneity. This ability to accurately and precisely probe microgel radial profiles has clear implications both for fundamental science and for industrial applications.
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46
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Márquez-Islas R, García-Valenzuela A. On the extinction coefficient of light in non-absorbing nanoparticle suspensions. APPLIED OPTICS 2018; 57:3390-3394. [PMID: 29726506 DOI: 10.1364/ao.57.003390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 03/29/2018] [Indexed: 06/08/2023]
Abstract
We assess the validity and possible use of a simple formula for the complex effective refractive index of a colloidal suspension of very small particles obtained from the quasi-crystalline approximation. This approximation takes into account the so-called dependent scattering effects, which are strongest, in relative terms, in suspensions of non-absorbing nanometer-sized particles. We test experimentally the predictions of the model for the extinction of light in dispersions of sodium dodecyl sulfate micelles in tri-distilled water. We find that the theoretical model can be fitted to the experimental data and provide estimates of the micelles' size and the minimum distance between each other in suspension.
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47
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Kubyshkin V, Budisa N. Exploring hydrophobicity limits of polyproline helix with oligomeric octahydroindole-2-carboxylic acid. J Pept Sci 2018; 24:e3076. [PMID: 29582506 DOI: 10.1002/psc.3076] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 02/24/2018] [Accepted: 02/26/2018] [Indexed: 12/12/2022]
Abstract
The polyproline-II helix is the most extended naturally occurring helical structure and is widely present in polar, exposed stretches and "unstructured" denatured regions of polypeptides. Can it be hydrophobic? In this study, we address this question using oligomeric peptides formed by a hydrophobic proline analogue, (2S,3aS,7aS)-octahydroindole-2-carboxylic acid (Oic). Previously, we found the molecular principles underlying the structural stability of the polyproline-II conformation in these oligomers, whereas the hydrophobicity of the peptide constructs remains to be examined. Therefore, we investigated the octan-1-ol/water partitioning and inclusion in detergent micelles of the oligo-Oic peptides. The results showed that the hydrophobicity is remarkably enhanced in longer oligomeric sequences, and the oligo-Oic peptides with 3 to 4 residues and higher are specific towards hydrophobic environments. This contrasts significantly to the parent oligoproline peptides, which were moderately hydrophilic. With these findings, we have demonstrated that the polyproline-II structure is compatible with nonpolar media, whereas additional manipulations of the terminal functionalities feature solubility in extremely nonpolar solvents such as hexane.
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Affiliation(s)
- Vladimir Kubyshkin
- Institute of Chemistry, Technical University of Berlin, Müller-Breslau-Str. 10, Berlin, 10623, Germany
| | - Nediljko Budisa
- Institute of Chemistry, Technical University of Berlin, Müller-Breslau-Str. 10, Berlin, 10623, Germany
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48
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Ji Q, Qiao X, Liu X, Jia H, Yu JS, Ariga K. Enhanced Adsorption Selectivity of Aromatic Vapors in Carbon Capsule Film by Control of Surface Surfactants on Carbon Capsule. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20170357] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Qingmin Ji
- Herbert Gleiter Institute of Nanoscience, Nanjing University of Science of Technology, 200 Xiaolingwei, Nanjing 210094, P. R. China
- MIIT Key Laboratory of Advanced Display Materials and Devices, Nanjing University of Science and Technology, Nanjing 210094, P. R. China
| | - Xu Qiao
- Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, P. R. China
| | - Xinbang Liu
- Herbert Gleiter Institute of Nanoscience, Nanjing University of Science of Technology, 200 Xiaolingwei, Nanjing 210094, P. R. China
| | - Hongbing Jia
- Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, P. R. China
| | - Jong-Sung Yu
- Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), T, Daegu 711-873, Korea
| | - Katsuhiko Ariga
- World Premier International (WPI) Research Center for Materials, Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba 277-0827, Japan
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Wang J, Lin CY, Moore C, Jhunjhunwala A, Jokerst JV. Switchable Photoacoustic Intensity of Methylene Blue via Sodium Dodecyl Sulfate Micellization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:359-365. [PMID: 29232146 PMCID: PMC6200325 DOI: 10.1021/acs.langmuir.7b03718] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The interaction between methylene blue (MB) and sodium dodecyl sulfate (SDS) has been widely studied spectroscopically, but details about their interactions remain unclear. Here, we combined photoacoustic (PA) imaging with nanoparticle tracking analysis (NTA) and spectroscopy to further elucidate this interaction. PA imaging of 0.05 mM MB showed a 492-fold increase in intensity upon the addition of 3.47 mM SDS. Higher concentrations above SDS's critical micelle concentration (CMC) at 8.67 mM decreased the PA intensity by 54 times. Relative quantum yield measurements indicated that PA intensity increased as a result of fluorescence quenching. Meanwhile, NTA indicated an increased number of nonmicellar MB/SDS clusters at SDS concentrations below the CMC varying in size from 80 to 400 nm as well as a decreased number above the CMC. This trend suggested that MB/SDS clusters are responsible for the PA intensity enhancement. Comparison of PA intensities and spectral shifts with MB/hexadecyltrimethylammonium bromide, MB/sodium octyl sulfate, and MB/sodium chloride demonstrated that MB was bound to the sulfate moiety of SDS before and after micellization. Our observations suggest that MB forms aggregates with SDS at premicellar concentrations, and the MB aggregates disassociate as monomers that are bound to the sulfate moiety of SDS at micellar concentrations. These findings further clarify the process by which MB and SDS interact and demonstrate the potential for developing MB-/SDS-based contrast agents.
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Affiliation(s)
- Junxin Wang
- Department of NanoEngineering, University of California San Diego, La Jolla, California 92093, United States
| | - Ching-Yu Lin
- Department of NanoEngineering, University of California San Diego, La Jolla, California 92093, United States
| | - Colman Moore
- Department of NanoEngineering, University of California San Diego, La Jolla, California 92093, United States
| | - Anamik Jhunjhunwala
- Department of BioEngineering, University of California San Diego, La Jolla, California 92093, United States
| | - Jesse V. Jokerst
- Department of NanoEngineering, University of California San Diego, La Jolla, California 92093, United States
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Galipeau K, Socki M, Socia A, Harmon PA. Incomplete Loading of Sodium Lauryl Sulfate and Fasted State Simulated Intestinal Fluid Micelles Within the Diffusion Layers of Dispersed Drug Particles During Dissolution. J Pharm Sci 2018. [DOI: 10.1016/j.xphs.2017.06.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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