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Zhang C, Cao L, Jiang Y, Huang Z, Liu G, Wei Y, Xia Q. Molecular Dynamics Simulations on the Adsorbed Monolayers of N-Dodecyl Betaine at the Air-Water Interface. Molecules 2023; 28:5580. [PMID: 37513452 PMCID: PMC10384152 DOI: 10.3390/molecules28145580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 07/14/2023] [Accepted: 07/21/2023] [Indexed: 07/30/2023] Open
Abstract
Betaine is a kind of zwitterionic surfactant with both positive and negative charge groups on the polar head, showing good surface activity and aggregation behaviors. The interfacial adsorption, structures and properties of n-dodecyl betaine (NDB) at different surface coverages at the air-water interface are studied through molecular dynamics (MD) simulations. Interactions between the polar heads and water molecules, the distribution of water molecules around polar heads, the tilt angle of the NDB molecule, polar head and tail chain with respect to the surface normal, the conformations and lengths of the tail chain, and the interfacial thickness of the NDB monolayer are analyzed. The change of surface coverage hardly affects the locations and spatial distributions of the water molecules around the polar heads. As more NDB molecules are adsorbed at the air-water interface, the number of hydrogen bonds between polar heads and water molecules slightly decreases, while the lifetimes of hydrogen bonds become larger. With the increase in surface coverage, less gauche defects along the alkyl chain and longer NDB chain are obtained. The thickness of the NDB monolayer also increases. At large surface coverages, tilted angles of the polar head, tail chain and whole NDB molecule show little change with the increase in surface area. Surface coverages can change the tendency of polar heads and the tail chain for the surface normal.
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Affiliation(s)
- Chengfeng Zhang
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
| | - Lulu Cao
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
| | - Yongkang Jiang
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
| | - Zhiyao Huang
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
| | - Guokui Liu
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
| | - Yaoyao Wei
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
| | - Qiying Xia
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
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2
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Yang Y, Zhang W, Zhang Z, Yang T, Xu Z, Zhang C, Guo B, Lu W. Efficient Bioremediation of Petroleum-Contaminated Soil by Immobilized Bacterial Agent of Gordonia alkanivorans W33. Bioengineering (Basel) 2023; 10:bioengineering10050561. [PMID: 37237630 DOI: 10.3390/bioengineering10050561] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Revised: 04/27/2023] [Accepted: 05/02/2023] [Indexed: 05/28/2023] Open
Abstract
In this article, we report a method for preparing an immobilized bacterial agent of petroleum-degrading bacteria Gordonia alkanivorans W33 by combining high-density fermentation and bacterial immobilization technology and testing its bioremediation effect on petroleum-contaminated soil. After determining the optimal combination of MgCl2, CaCl2 concentration, and culture time in the fermentation conditions by conducting a response surface analysis, the cell concentration reached 7.48 × 109 CFU/mL by 5 L fed-batch fermentation. The W33-vermiculite-powder-immobilized bacterial agent mixed with sophorolipids and rhamnolipids in a weight ratio of 9:10 was used for the bioremediation of petroleum-contaminated soil. After 45 days of microbial degradation, 56.3% of the petroleum in the soil with 20,000 mg/kg petroleum content was degraded, and the average degradation rate reached 250.2 mg/kg/d.
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Affiliation(s)
- Yong Yang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- CNOOC EnerTech-Safety & Environmental Protection Co., Tianjin 300457, China
| | - Wanze Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Zhanwei Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Ting Yang
- China Offshore Environmental Service Ltd., Tianjin 300457, China
| | - Zhuo Xu
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Chuanbo Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Bing Guo
- China Offshore Environmental Service Ltd., Tianjin 300457, China
| | - Wenyu Lu
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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3
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Zhao Y, He J, Xu W, Fang B. Viscoelastic micellar system of mixed surfactin and octadecyl trimethyl ammonium chloride. J SURFACTANTS DETERG 2022. [DOI: 10.1002/jsde.12594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yuqing Zhao
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Laboratory of Chemical Engineering Rheology East China University of Science and Technology Shanghai China
| | - Jinlan He
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Laboratory of Chemical Engineering Rheology East China University of Science and Technology Shanghai China
| | - Wenting Xu
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Laboratory of Chemical Engineering Rheology East China University of Science and Technology Shanghai China
| | - Bo Fang
- Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Laboratory of Chemical Engineering Rheology East China University of Science and Technology Shanghai China
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4
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Su L, Sun J, Ding F, Gao X, Zheng L. Effect of molecular structure on synergism in mixed zwitterionic/anionic surfactant system: An experimental and simulation study. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114933] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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5
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Rodríguez-López L, López-Prieto A, Lopez-Álvarez M, Pérez-Davila S, Serra J, González P, Cruz JM, Moldes AB. Characterization and Cytotoxic Effect of Biosurfactants Obtained from Different Sources. ACS OMEGA 2020; 5:31381-31390. [PMID: 33324849 PMCID: PMC7726928 DOI: 10.1021/acsomega.0c04933] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 11/12/2020] [Indexed: 05/04/2023]
Abstract
In this work, five biosurfactant extracts, obtained from different sources, all of them with demonstrated antimicrobial properties, were characterized and subjected to a cytotoxic study using mouse fibroblast cells (NCTC clone 929). Biosurfactant extracts obtained directly from corn steep water (CSW) showed similar surfactant characteristics to those of the extracellular biosurfactant extract produced by Bacillus isolated from CSW and grown in tryptic soy broth, observing that they are amphoteric, consisting of viscous and yellowish liquid with no foaming capacity. Contrarily, cell-bound biosurfactant extracts produced from Lactobacillus pentosus or produced by Bacillus sp isolated from CSW are nonionic, consisting of a white powder with foaming capacity. All the biosurfactants possess a similar fatty acid composition. The cytotoxic test revealed that the extracts under evaluation, at a concentration of 1 g/L, were not cytotoxic for fibroblasts (fibroblast growth > 90%). The biosurfactant extract obtained from CSW with ethyl acetate, at 1 g/L, showed the highest cytotoxic effect but above the cytotoxicity limit established by the UNE-EN-ISO10993-5. It is remarkable that the cell-bound biosurfactant produced by L. pentosus, at a concentration of 1 g/L, promoted the growth of the fibroblast up to 113%.
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Affiliation(s)
- Lorena Rodríguez-López
- EQ10 Group, CINTECX,
Department Chemical Engineering, Universidade
de Vigo-University of Vigo, Campus As Lagoas-Marcosende, 36310 Vigo, Spain
| | - Alejandro López-Prieto
- EQ10 Group, CINTECX,
Department Chemical Engineering, Universidade
de Vigo-University of Vigo, Campus As Lagoas-Marcosende, 36310 Vigo, Spain
| | - Miriam Lopez-Álvarez
- New Materials Group,
CINTECX, IISGS, Department Applied Physics, University of Vigo, Campus Lagoas-Marcosende, Vigo 36310, Spain
| | - Sara Pérez-Davila
- New Materials Group,
CINTECX, IISGS, Department Applied Physics, University of Vigo, Campus Lagoas-Marcosende, Vigo 36310, Spain
| | - Julia Serra
- New Materials Group,
CINTECX, IISGS, Department Applied Physics, University of Vigo, Campus Lagoas-Marcosende, Vigo 36310, Spain
| | - Pío González
- New Materials Group,
CINTECX, IISGS, Department Applied Physics, University of Vigo, Campus Lagoas-Marcosende, Vigo 36310, Spain
| | - José Manuel Cruz
- EQ10 Group, CINTECX,
Department Chemical Engineering, Universidade
de Vigo-University of Vigo, Campus As Lagoas-Marcosende, 36310 Vigo, Spain
| | - Ana B. Moldes
- EQ10 Group, CINTECX,
Department Chemical Engineering, Universidade
de Vigo-University of Vigo, Campus As Lagoas-Marcosende, 36310 Vigo, Spain
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Kong LL, Gang HZ, Ye RQ, Mu BZ. Role of molecular interactions between biosurfactant surfactin and alkylbenzenesulfonate. J DISPER SCI TECHNOL 2020. [DOI: 10.1080/01932691.2019.1614948] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Ling-Ling Kong
- State Key Laboratory of Bioreactor Engineering and School of Chemistry & Molecular Engineering, East China University of Science and Technology , Shanghai , P.R. China
| | - Hong-Ze Gang
- State Key Laboratory of Bioreactor Engineering and School of Chemistry & Molecular Engineering, East China University of Science and Technology , Shanghai , P.R. China
| | - Ru-Qiang Ye
- State Key Laboratory of Bioreactor Engineering and School of Chemistry & Molecular Engineering, East China University of Science and Technology , Shanghai , P.R. China
| | - Bo-Zhong Mu
- State Key Laboratory of Bioreactor Engineering and School of Chemistry & Molecular Engineering, East China University of Science and Technology , Shanghai , P.R. China
- Shanghai Collaborative Innovation Center for Biomanufacturing Technology , Shanghai , P.R. China
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Wu Z, Li Y, Li J, Wang M, Wang Z. Interaction and Properties of the Synthesized Anionic Surfactant with CTAB: An Experimental and Theoretical Investigation. ChemistrySelect 2020. [DOI: 10.1002/slct.201903814] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Zhifang Wu
- China Research Institute of Daily Chemistry Co., Ltd Taiyuan 030001 China
| | - Yunling Li
- China Research Institute of Daily Chemistry Co., Ltd Taiyuan 030001 China
| | - Jun Li
- China Research Institute of Daily Chemistry Co., Ltd Taiyuan 030001 China
| | - Mengwei Wang
- China Research Institute of Daily Chemistry Co., Ltd Taiyuan 030001 China
| | - Zhifei Wang
- China Research Institute of Daily Chemistry Co., Ltd Taiyuan 030001 China
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Wei D, Ge L, Wang Z, Wang Y, Guo R. Self-Assembled Dual Helical Nanofibers of Amphiphilic Perylene Diimides with Oligopeptide Substitution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11745-11754. [PMID: 31424227 DOI: 10.1021/acs.langmuir.9b01745] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We designed an asymmetric amphiphilic perylene diimide (PDI) with the oligopeptide substituting one of the imides. The self-assembly mechanism of this PDI in different solvents was investigated. Right-handed "dual" helical nanofibers/nanowires with a uniform lateral dimension of ∼8 nm are constructively self-assembled. The long-term ordered degree within the nanofibers stems from the delicate balance between π-π stacking of the PDI rings and β-sheet-like hydrogen bond formed by the oligopeptide. The synergistic interplay between the hydrogen bond and π-π stacking rather than competition endows the nanofibers with the controllable longitudinal dimensions by different factors such as the concentration and solvents. The transition from the nanofibers to the small aggregates is also achieved by the addition of trifluoroacetic acid because of breakup of the hydrogen bonds, which is reversed by further addition of trimethylamine. The acid-base stimulation can be extended to different solvents as long as the existence of the unique hydrogen bonds.
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9
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Zhang Z, Li K, Tian R, Lu C. Substrate-Assisted Visualization of Surfactant Micelles via Transmission Electron Microscopy. Front Chem 2019; 7:242. [PMID: 31032251 PMCID: PMC6470246 DOI: 10.3389/fchem.2019.00242] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 03/26/2019] [Indexed: 11/30/2022] Open
Abstract
The visualization of the micellar morphological evolution for surfactant has drawn much attention due to its self-assemble ability to fold into various structures. However, the direct observation of the soft materials with low atomic number has been hampered because of the poor scattering contrast and complex staining process by the traditional transmission electron microscopy (TEM) techniques. Herein, we reported a novel strategy to the visualization of surfactant micelles with the assistance of layered double hydroxides (LDHs) via TEM. Owing to the uniformly distributed metal ions and positive charges in the LDHs, the surfactant at the micelle-water interface reacted with LDHs to form a stabilized architecture through electrostatic and hydrogen-bond interactions. The morphologies of the surfactant can be clearly observed through the surfactant-LDHs architectures, exhibiting high contrast by TEM techniques. Significantly, the micellar evolutions involving the spherical, rodlike, and wormlike shapes were successfully distinguished. Our results may provide great possibilities and inspirations for the visualization for morphology of soft matters.
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10
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Fluorine-containing block/branched polyamphiphiles forming bioinspired complexes with biopolymers. Colloids Surf B Biointerfaces 2019; 174:393-400. [DOI: 10.1016/j.colsurfb.2018.11.047] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 10/16/2018] [Accepted: 11/19/2018] [Indexed: 01/22/2023]
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11
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Wu Z, Li Y, Li J, Wang M, Wang Z. Study on the properties and self-assembly of fatty alcohol ether carboxylic ester anionic surfactant and cationic surfactant in a mixed system. NEW J CHEM 2019. [DOI: 10.1039/c9nj02407g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Mixed system A12–14EC9E-Na/DEQ exhibits excellent surface activity, application properties, and interesting self-assembly behaviors.
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Affiliation(s)
- Zhifang Wu
- China Research Institute of Daily Chemistry Co., Ltd
- Taiyuan 030001
- P. R. China
| | - Yunling Li
- China Research Institute of Daily Chemistry Co., Ltd
- Taiyuan 030001
- P. R. China
| | - Jun Li
- China Research Institute of Daily Chemistry Co., Ltd
- Taiyuan 030001
- P. R. China
| | - Mengwei Wang
- China Research Institute of Daily Chemistry Co., Ltd
- Taiyuan 030001
- P. R. China
| | - Zhifei Wang
- China Research Institute of Daily Chemistry Co., Ltd
- Taiyuan 030001
- P. R. China
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12
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Chiappisi L, Keiderling U, Gutierrez-Ulloa CE, Gómez R, Valiente M, Gradzielski M. Aggregation behavior of surfactants with cationic and anionic dendronic head groups. J Colloid Interface Sci 2019; 534:430-439. [DOI: 10.1016/j.jcis.2018.09.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 08/31/2018] [Accepted: 09/03/2018] [Indexed: 01/22/2023]
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13
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Kong L, Gang H, Wang Z, Li T, Jafta CJ, Fei D, Ye R, Mu B. Micellization in binary biosurfactant/synthetic surfactant systems: Effects of temperature and hydrophobic group structure of alkyl benzenesulfonate. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.04.048] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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14
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Jin L, Garamus VM, Liu F, Xiao J, Eckerlebe H, Willumeit-Römer R, Mu B, Zou A. Interaction of a biosurfactant, Surfactin with a cationic Gemini surfactant in aqueous solution. J Colloid Interface Sci 2016; 481:201-9. [PMID: 27475707 DOI: 10.1016/j.jcis.2016.07.044] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 07/15/2016] [Accepted: 07/18/2016] [Indexed: 11/16/2022]
Abstract
The interaction between biosurfactant Surfactin and cationic Gemini surfactant ethanediyl-1,3-bis(dodecyldimethylammonium bromide) (abbreviated as 12-3-12) was investigated using turbidity, surface tension, dynamic light scattering (DLS) and small angle neutron scattering (SANS). Analysis of critical micelle concentration (CMC) values in Surfactin/12-3-12 mixture indicates that there is synergism in formation of mixed Surfactin/12-3-12 micelles. Although Surfactin and 12-3-12 are oppositely charged in phosphate buffer solution (PBS, pH7.4), there are no precipitates observed at the concentrations below the CMC of Surfactin/12-3-12 system. However, at the concentration above CMC value, the Surfactin/12-3-12 mixture is severely turbid with high 12-3-12 content. DLS and SANS measurements follow the size and shape changes of mixed Surfactin/12-3-12 aggregates from small spherical micelles via elongated aggregates to large bulk complexes with increasing fraction of Gemini surfactant.
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Affiliation(s)
- Lei Jin
- Shanghai Key Laboratory of Functional Materials Chemistry and State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
| | - Vasil M Garamus
- Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Materials Research, Max-Planck-Strasse 1, 21502 Geesthacht, Germany
| | - Fang Liu
- Shanghai Key Laboratory of Functional Materials Chemistry and State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
| | - Jingwen Xiao
- Shanghai Key Laboratory of Functional Materials Chemistry and State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
| | - Helmut Eckerlebe
- Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Materials Research, Max-Planck-Strasse 1, 21502 Geesthacht, Germany
| | - Regine Willumeit-Römer
- Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Materials Research, Max-Planck-Strasse 1, 21502 Geesthacht, Germany
| | - Bozhong Mu
- Shanghai Key Laboratory of Functional Materials Chemistry and State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
| | - Aihua Zou
- Shanghai Key Laboratory of Functional Materials Chemistry and State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China.
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Riabtseva A, Mitina N, Grytsyna I, Boiko N, Garamus VM, Stryhanyuk H, Stoika R, Zaichenko A. Functional micelles formed by branched polymeric surfactants: Synthesis, characteristics, and application as nanoreactors and carriers. Eur Polym J 2016. [DOI: 10.1016/j.eurpolymj.2016.01.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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16
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Pambou E, Crewe J, Yaseen M, Padia FN, Rogers S, Wang D, Xu H, Lu JR. Structural Features of Micelles of Zwitterionic Dodecyl-phosphocholine (C₁₂PC) Surfactants Studied by Small-Angle Neutron Scattering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:9781-9789. [PMID: 26301341 DOI: 10.1021/acs.langmuir.5b02077] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Small-angle neutron scattering (SANS) was used to investigate the size and shape of zwitterionic dodecyl phosphocholine (C12PC) micelles formed at various concentrations above its critical micelle concentration (CMC = 0.91 mM). The predominant spherical shape of micelles is revealed by SANS while the average micellar size was found to be broadly consistent with the hydrodynamic diameters determined by dynamic light scattering (DLS). Cryogenic tunneling electron microscopy (cryo-TEM) shows a uniform distribution of structures, proposing micelle monodispersity ( Supporting Information ). H/D substitution was utilized to selectively label the chain, head, or entire surfactant so that structural distributions within the micellar assembly could be investigated using fully protonated, head-deuterated, and tail-deuterated PC surfactants in D2O and fully deuterated surfactants in H2O. Using the analysis software we have developed, the four C12PC contrasts at a given concentration were simultaneously analyzed using various core-shell models consisting of a hydrophobic core and a shell representing hydrated polar headgroups. Results show that at 10 mM, C12PC micelles can be well represented by a spherical core-shell model with a core radius and shell thicknesses of 16.9 ± 0.5 and 10.2 ± 2.0 Å (total radius 27.1 ± 2.0 Å), respectively, with a surfactant aggregation number of 57 ± 5. As the concentration was increased, the SANS data revealed an increase in core-shell mixing, characterized by the emergence of an intermediate mixing region at the spherical core-shell interface. C12PC micelles at 100 mM were found to have a core radius and shell thicknesses of 19.6 ± 0.5 and 7.8 ± 2.0 Å, with an intermediate mixing region of 3.0 ± 0.5 Å. Further reduction in the shell thickness with concentration was also observed, coupled with an increased mixing of the core and shell regions and a reduction in miceller hydration, suggesting that concentration has a significant influence on surfactant packing and aggregation within micelles.
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Affiliation(s)
- Elias Pambou
- Biological Physics Group, School of Physics and Astronomy, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - John Crewe
- Biological Physics Group, School of Physics and Astronomy, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Mohammed Yaseen
- Biological Physics Group, School of Physics and Astronomy, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Faheem N Padia
- Biological Physics Group, School of Physics and Astronomy, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Sarah Rogers
- STFC ISIS Facility, Rutherford Appleton Laboratory , Didcot OX11 0QX, United Kingdom
| | - Dong Wang
- Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , 66 Changjiang West Road, Qingdao 266555, China
| | - Hai Xu
- Centre for Bioengineering and Biotechnology, China University of Petroleum (East China) , 66 Changjiang West Road, Qingdao 266555, China
| | - Jian R Lu
- Biological Physics Group, School of Physics and Astronomy, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
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Xiao J, Liu F, Garamus VM, Almásy L, Handge UA, Willumeit R, Mu B, Zou A. Insights into the interactions among Surfactin, betaines, and PAM: surface tension, small-angle neutron scattering, and small-angle X-ray scattering study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:3363-3372. [PMID: 24593673 DOI: 10.1021/la4046034] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The interactions among neutral polymer polyacrylamide (PAM) and the biosurfactant Surfactin and four betaines, N-dodecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (SDDAB), N-tetradecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (STDAB), N-hexadecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (SHDAB), and N-dodecyl-N,N-dimethyl-2-ammonio-acetate (C12BE), in phosphate buffer solution (PBS) have been studied by surface tension measurements, small-angle neutron scattering (SANS), small-angle X-ray scattering (SAXS), and rheological experiments. It has been confirmed that the length of alkyl chain is a key parameter of interaction between betaines and PAM. Differences in scattering contrast between X-ray and neutrons for surfactants and PAM molecules provide the opportunity to separately follow the changes of structure of PAM and surfactant aggregates. At concentrations of betaines higher than CMC (critical micelle concentration) and C2 (CMC of surfactant with the presence of polymer), spherical micelles are formed in betaines and betaines/PAM solutions. Transition from spherical to rod-like aggregates (micelles) has been observed in solutions of Surfactin and Surfactin/SDDAB (αSurfactin = 0.67 (molar fraction)) with addition of 0.8 wt % of PAM. The conformation change of PAM molecules only can be observed for Surfactin/SDDAB/PAM system. Viscosity values follow the structural changes suggested from scattering measurements i.e., gradually increases for mixtures PAM → Surfactin/PAM → Surfactin/SDDAB/PAM in PBS.
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Affiliation(s)
- Jingwen Xiao
- Shanghai Key Laboratory of Functional Materials Chemistry and State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology , Shanghai 200237, People's Republic of China
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