Self-assembly of cationic gemini surfactants, alkanediyl-bis-(dimethyldodecyl-ammonium bromide), in cyclohexane: effects of spacer length on their association into reverse lyotropic liquid crystalline or reverse vesicles

Soft Matter ◽  
2018 ◽  
Vol 14 (5) ◽  
pp. 734-741 ◽  
Author(s):  
Shenglu Deng ◽  
Jianxi Zhao
Keyword(s):  
Self Assembly ◽  
Liquid Crystalline ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Ammonium Bromide ◽  
Spacer Length ◽  
Cationic Gemini Surfactants ◽  
Reverse Vesicles

An increase in the spacer length of the gemini surfactant 12-s-12 strongly influenced the aggregation of the surfactant in cyclohexane.

scholarly journals Surface tension study of cationic gemini surfactants binding to DNA

2014 ◽  
Vol 12 (5) ◽  
pp. 577-585 ◽  
Author(s):  
Martin Pisárčik ◽  
Ferdinand Devínsky
Keyword(s):  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Adsorption Behaviour ◽  
Binding Properties ◽  
Simple Method ◽  
Spacer Length ◽  
Cationic Gemini Surfactants ◽  
Methylene Groups ◽  
Weak Adsorption ◽  
Surface Tension Study

AbstractBinding of cationic gemini surfactants alkanediyl-a-ω-bis(dimethyldodecylammonium bromides) with variable polymethylene spacer length ranging from 2 to 12 methylene groups to DNA in NaBr solution is investigated utilizing the tensiometry method. A simple method is presented for calculating the number of surfactant molecules bound to DNA. The results are evaluated in terms of the gemini surfactant spacer length, showing that gemini molecules with either short spacers (2 methylene groups) or long spacers are most efficiently adsorbed to DNA. A weak adsorption to DNA was found for gemini molecules with a medium spacer length (6 methylene groups in the spacer). The binding properties of cationic gemini surfactants as a function of spacer length are consistent with the results obtained by other experimental methods (dynamic light scattering measurements, fluorescence spectroscopy), indicating identical adsorption behaviour of gemini molecules as a function of the spacer length.

Self-Assembly and Chiral Recognition of Chiral Cationic Gemini Surfactants

Langmuir ◽  
2018 ◽  
Vol 34 (43) ◽  
pp. 12924-12933 ◽  
Author(s):  
Lili Zhou ◽  
Jiling Yue ◽  
Yaxun Fan ◽  
Yilin Wang
Keyword(s):  
Self Assembly ◽  
Chiral Recognition ◽  
Gemini Surfactants ◽  
Cationic Gemini Surfactants

Surface Activity Research of Cationic Gemini Surfactants

2013 ◽  
Vol 690-693 ◽  
pp. 2076-2080
Author(s):  
Zhen Zhong Fan ◽  
Lan Lan Li ◽  
Li Feng Zhang ◽  
Qing Wang Liu
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Surface Activity ◽  
Surfactant Concentration ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Ph Value ◽  
Inorganic Salts ◽  
Cationic Gemini Surfactant ◽  
Cationic Gemini Surfactants

Cationic Gemini surfactant concentration, the inorganic salts added and the pH value of surface tension obtained cationic gemini surfactant critical micelle concentration is 0.4mmol / L;by adding three kinds of inorganic salts NaCl, MgCl2, and Na2SO4 ,which Na2SO4 has the greatest impact on surface tension, followed by MgCl2.The surface minimum tension of the pH ranged from 9 to 11 , indicating that the surface activity of cationic gemini surfactants achieved the highest.

scholarly journals Synthesis and assessment of new cationic gemini surfactants as inhibitors for carbon steel corrosion in oilfield water

RSC Advances ◽  
2017 ◽  
Vol 7 (75) ◽  
pp. 47335-47352 ◽  
Author(s):  
F. El-Taib Heakal ◽  
M. A. Deyab ◽  
M. M. Osman ◽  
M. I. Nessim ◽  
A. E. Elkholy
Keyword(s):  
Carbon Steel ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Steel Corrosion ◽  
Surfactant Molecule ◽  
Cationic Gemini Surfactants ◽  
Oilfield Water

Stylized representation of Gemini surfactant molecule.

scholarly journals Self-assembly of quaternary ammonium gemini surfactants in cyclohexane upon reinforcement by simple counterions

RSC Advances ◽  
2018 ◽  
Vol 8 (34) ◽  
pp. 18880-18888 ◽  
Author(s):  
Sheng-lu Deng ◽  
Jian-xi Zhao ◽  
Zhi-xiu Wen
Keyword(s):  
Quaternary Ammonium ◽  
Self Assembly ◽  
Gemini Surfactants ◽  
Salt Effects ◽  
Spacer Length

12-s-12/salt formed various reverse aggregates in cyclohexane dependent upon both spacer length and salt effects.

Activity of Polyphenoloxidase in red Fuji Apples Promoted with Cationic Surfactant – Role of Surfactant Structure

2021 ◽  
Vol 58 (5) ◽  
pp. 383-393
Author(s):  
Maozhang Tian ◽  
Fan Zhang ◽  
Lu Wang ◽  
Xing Dong ◽  
Lifei Zhang ◽  
...  
Keyword(s):  
Gemini Surfactant ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Gemini Surfactants ◽  
Ammonium Bromide ◽  
Wide Range ◽  
Dimethyl Ammonium ◽  
Dodecyl Trimethyl Ammonium Bromide ◽  
Cetyl Trimethyl Ammonium ◽  
Menten Constant

Abstract In this study, we observed the activity of polyphenoloxidase (PPO) in red Fuji apples in the presence of single-chained surfactants (including cetyl trimethyl ammonium bromide (CTAB), and dodecyl trimethyl ammonium bromide (DTAB)) and gemini surfactants (pentamethylene-α,ω-bis(dodecyl dimethyl ammonium bromide), octamethylene-α,ω-bis(dodecyl dimethyl ammonium bromide, dodecamethylene-α,ω-bis(dodecyl dimethyl ammonium bromide), pentamethylene-α,ω-bis(cetyl dimethyl ammonium bromide), and octamethylene-α,ω-bis(cetyl dimethyl ammonium bromide)). It was found that all these surfactants enhanced the activity of PPO in a wide range of temperature at low content. When PPO was denatured by incubating at high temperature, the surfactants caused reactivation of PPO. Compared to the single-chained surfactants, the gemini surfactants increased PPO activity at a much lower concentration. Moreover, the single-chained surfactant and the gemini surfactant acted together to further increase PPO activity, and the synergistic effect reduced the amount of surfactant used. In addition, the Michaelis-Menten constant for PPO did not change in the presence of the surfactants, suggesting the active site should remain well with the surfactants.

scholarly journals Development of Lyophilized Gemini Surfactant-Based Gene Delivery Systems: Influence of Lyophilization on the Structure, Activity and Stability of the Lipoplexes

2012 ◽  
Vol 15 (4) ◽  
pp. 548 ◽  
Author(s):  
Waleed Mohammed-Saeid ◽  
Deborah Michel ◽  
Anas El-Aneed ◽  
Ronald E Verrall ◽  
Nicholas H Low ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Transfection Efficiency ◽  
Gene Transfection ◽  
Physiochemical Properties ◽  
Cationic Gemini Surfactants ◽  
The Stability ◽  
In Vitro Transfection

Purpose. Cationic gemini surfactants have been studied as non-viral vectors for gene therapy. Clinical applications of cationic lipid/DNA lipoplexes are restricted by their instability in aqueous formulations. In this work, we investigated the influence of lyophilization on the essential physiochemical properties and in vitro transfection of gemini surfactant-lipoplexes. Additionally, we evaluated the feasibility of lyophilization as a technique for preparing lipoplexes with long term stability. Methods. A gemini surfactant [12-7NH-12] and plasmid DNA encoding for interferon-γ were used to prepare gemini surfactant/pDNA [P/G] lipoplexes. Helper lipid DOPE [L] was incorporated in all formulation producing a [P/G/L] system. Sucrose and trehalose were utilized as stabilizing agents. To evaluate the ability of lyophilization to improve the stability of gemini surfactant-based lipoplexes, four lyophilized formulations were stored at 25˚C for three months. The formulations were analyzed at different time-points for physiochemical properties and in vitro transfection. Results. The results showed that both sucrose and trehalose provided anticipated stabilizing effect. The transfection efficiency of the lipoplexes increased 2-3 fold compared to fresh formulations upon lyophilization. This effect can be attributed to the improvement of DNA compaction and changes in the lipoplex morphology due to the lyophilization/rehydration cycles. The physiochemical properties of the lyophilized formulations were maintained throughout the stability study. All lyophilized formulations showed a significant loss of gene transfection activity after three months of storage. Nevertheless, no significant losses of transfection efficiency were observed for three formulations after two months storage at 25 ˚C. Conclusion. Lyophilization significantly improved the physical stability of gemini surfactant-based lipoplexes compared to liquid formulations. As well, lyophilization improved the transfection efficiency of the lipoplexes. The loss of transfection activity upon storage is most probably due to the conformational changes in the supramolecular structure of the lipoplexes as a function of time and temperature rather than to DNA degradation. This article is open to POST-PUBLICATION REVIEW. Registered readers (see “For Readers”) may comment by clicking on ABSTRACT on the issue’s contents page.

Coarse-grained molecular dynamics study on the self-assembly of Gemini surfactants: the effect of spacer length

2017 ◽  
Vol 19 (6) ◽  
pp. 4462-4468 ◽  
Author(s):  
Pan Wang ◽  
Shuai Pei ◽  
Muhan Wang ◽  
Youguo Yan ◽  
Xiaoli Sun ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Self Assembly ◽  
Gemini Surfactants ◽  
Molecular Level ◽  
Underlying Mechanism ◽  
The Self ◽  
Coarse Grained ◽  
Spacer Length ◽  
Coarse Grained Molecular Dynamics

This work provides a molecular-level understanding of the underlying mechanism of the self-assembly of Gemini surfactants.

scholarly journals Silver Nanoparticles Stabilised by Cationic Gemini Surfactants with Variable Spacer Length

Molecules ◽  
2017 ◽  
Vol 22 (10) ◽  
pp. 1794 ◽  
Author(s):  
Martin Pisárčik ◽  
Josef Jampílek ◽  
Miloš Lukáč ◽  
Renáta Horáková ◽  
Ferdinand Devínsky ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Gemini Surfactants ◽  
Spacer Length ◽  
Cationic Gemini Surfactants

scholarly journals Controllable enzymatic superactivity of α-chymotrypsin activated by the electrostatic interaction with cationic gemini surfactants

RSC Advances ◽  
2021 ◽  
Vol 11 (13) ◽  
pp. 7294-7304
Author(s):  
Zheng Yue ◽  
Meihuan Yao ◽  
Guangyue Bai ◽  
Jiuxia Wang ◽  
Kelei Zhuo ◽  
...  
Keyword(s):  
Charge Density ◽  
Electrostatic Interaction ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Cationic Gemini Surfactant ◽  
Cationic Gemini Surfactants ◽  
Novel Strategy

This study proposes a novel strategy to enhance enzymatic superactivity of α-CT by controlling the charge density of cationic gemini surfactant.

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