Quaternary-ammonium-bearing Aromatic Surfactants: Effect of the Alkyl Chain Positions on Their Micelle and DNA-complex Structures

2011 ◽  
Vol 40 (12) ◽  
pp. 1340-1342 ◽  
Author(s):  
Takuma Matsuo ◽  
Shota Fujii ◽  
Yumi Kamikawa ◽  
Tomoki Nishimura ◽  
Yusuke Sanada ◽  
...  
Keyword(s):  
Quaternary Ammonium ◽  
Alkyl Chain ◽  
Complex Structures ◽  
Dna Complex

Long alkyl chain quaternary ammonium-based ionic liquids and potential applications

2006 ◽  
Vol 8 (9) ◽  
pp. 798 ◽  
Author(s):  
Juliusz Pernak ◽  
Marcin Smiglak ◽  
Scott T. Griffin ◽  
Whitney L. Hough ◽  
Timothy B. Wilson ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Quaternary Ammonium ◽  
Alkyl Chain ◽  
Potential Applications ◽  
Long Alkyl Chain

Long-Alkyl-Chain Quaternary Ammonium Lactate Based Ionic Liquids

2008 ◽  
Vol 14 (30) ◽  
pp. 9305-9311 ◽  
Author(s):  
Jacek Cybulski ◽  
Anna Wiśniewska ◽  
Anna Kulig-Adamiak ◽  
Lidia Lewicka ◽  
Anna Cieniecka-Rosłonkiewicz ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Quaternary Ammonium ◽  
Alkyl Chain ◽  
Ammonium Lactate ◽  
Long Alkyl Chain

scholarly journals Interaction between DNA and Trimethyl-Ammonium Bromides with Different Alkyl Chain Lengths

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Chao Cheng ◽  
Shi-Yong Ran
Keyword(s):  
Surfactant Concentration ◽  
Alkyl Chain ◽  
Scattering Method ◽  
High Concentration ◽  
Dna Structures ◽  
Dynamic Light Scattering Method ◽  
Atomic Force ◽  
Chain Lengths ◽  
Dna Complex ◽  
Long Alkyl Chain

The interaction betweenλ—DNA and cationic surfactants with varying alkyl chain lengths was investigated. By dynamic light scattering method, the trimethyl-ammonium bromides-DNA complex formation was shown to be dependent on the length of the surfactant’s alkyl chain. For surfactants with sufficient long alkyl chain (CTAB, TTAB, DTAB), the compacted particles exist with a size of ~60–110 nm at low surfactant concentrations. In contrast, high concentration of surfactants leads to aggregates with increased sizes. Atomic force microscope scanning also supports the above observation. Zeta potential measurements show that the potential of the particles decreases with the increase of surfactant concentration (CTAB, TTAB, DTAB), which contributes much to the coagulation of the particles. For OTAB, the surfactant with the shortest chain in this study, it cannot fully neutralize the charges of DNA molecules; consequently, the complex is looser than other surfactant-DNA structures.

Enantiomerically pure quaternary ammonium salts with a chiral alkyl chain N(CH3)(n-C3H7)2(sec-C4H9)I: Synthesis and physical studies

Chirality ◽  
2008 ◽  
Vol 20 (10) ◽  
pp. 1085-1091 ◽  
Author(s):  
Ruxandra Gheorghe ◽  
Lise-Marie Chamoreau ◽  
Josef Kapitan ◽  
Nikolaï S. Ovanesyan ◽  
Sergei M. Aldoshin ◽  
...  
Keyword(s):  
Quaternary Ammonium ◽  
Alkyl Chain ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Enantiomerically Pure

The influence of electrolytes on gaseous monolayers II. Ionized films

1955 ◽  
Vol 232 (1189) ◽  
pp. 159-172 ◽  
Keyword(s):  
Surface Potential ◽  
Quaternary Ammonium ◽  
Alkyl Chain ◽  
Electrolyte Concentration ◽  
Ammonium Ion ◽  
Water Interface ◽  
Ammonium Halides ◽  
Air Water Interface ◽  
Good Agreement ◽  
The Ideal

An equation of state for a charged monolayer spread on an aqueous solution of a 1:1 electrolyte at 20°C in the absence of cohesive interactions has been derived, namely II = 2 kT / A-A o + 6.10√ c cosh sinh -1 133/ A √ c 6.10√ c . It has been found to apply to soluble charged films at hydrocarbon/water interfaces. In the case of insoluble monolayers of both alkyl quaternary ammonium halides and sodium alkyl sulphates at the hydrocarbon/water interface there is evidence of considerable ( ~50 %) ion-pair association, and this appears to be even further enhanced at the air/water interface at least for sulphate films. Surface potentials, measured by both the radioactive electrode and vibrating plate condenser techniques have been found to be in good agreement. The surface potential of sulphate monolayers in contrast to the ideal behaviour of quaternary ammonium films has been found to be dependent not only on the electrolyte concentration and film area but also on the nature of the interface, the nature of the substrate and at the air/water interface on the chain length. This has been attributed to a reorientation of the film molecules at the interface. Differences in the surface potential behaviour of sulphate and quaternary ammonium films are explained by suggesting that whereas with the sulphate film restricted rotation about the C—O bond can lead to different configurations of the sulphate ion with respect to the alkyl chain, only one configuration is possible for the symmetrical quaternary ammonium ion. Surface potential evidence indicates that contrary to what has been suggested previously, sulphate monolayers are completely dissociated in the acid-base sense.

Antimicrobial Activity of Quaternary Ammonium Salts of Some Saturated Heterocycloalkyl Amines [1]

1979 ◽  
Vol 34 (5-6) ◽  
pp. 485-486 ◽  
Author(s):  
Ivan Lacko ◽  
Ferdinand Devínsky ◽  
Ľudovít Krasnec ◽  
Dušan Mlynarčik
Keyword(s):  
Antimicrobial Activity ◽  
Quaternary Ammonium ◽  
Alkyl Chain ◽  
Heterocyclic Ring ◽  
Substantial Effect ◽  
Quaternary Ammonium Salts ◽  
Heterocyclic Amines ◽  
Ammonium Salts ◽  
Activity Change ◽  
Inhibition Concentration

Abstract N,N-Dialkyl Ammonium Salts of Saturated Heterocyclic Amines, Antimicrobial Activity Antimicrobial activity of N-alkyl-N-dodecylpiperidinium bromides and N-ethyl-N-dodecylheterocycloalkyl ammonium bromides (pyrrolidine, morpholine, perhydroazepine) deter­ mined on grampositive and gramnegative bacteria, yeasts and moulds, presented as minimum inhibition concentration (MIC). Comparison of the effect of change of structure: lenghtening of alkyl chain, change of heterocyclic ring. Change in the lenght of alkyl chain markedly affects the antimicrobial activity, change of heterocyclic ring has no substantial effect. The most active compounds were N-heptyl-and N-hexyl-N-dodecylpiperidinium bromides.

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