Effect of Temperature on the Mixed Micellar Tetradecyltrimethylammonium Bromide–Butanol System

Castedo, and Luis; Castillo, José L.; Suarez-Filloy, M. J.; Rodríguez, Jorge

doi:10.1006/jcis.1997.5201

Cited by 28 publications

(19 citation statements)

References 26 publications

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“…In order to investigate whether the negative charge of SDS was essential for this interaction, similar experiments were carried out in the presence of tetradecyltrimethylammonium bromide (TTAB), a cationic counterpart of SDS with very similar physicochemical properties. The spectra obtained in TTAB (concentrations ranging from 1 M to 10 mM, with a CMC of 3.6 mM [2]) are not significantly different from those obtained in aqueous solution and typically account for a random coil conformation (Fig. 3).…”

Section: Resultsmentioning

confidence: 81%

Biological Activities and Structural Properties of the Atypical Bacteriocins Mesenterocin 52B and Leucocin B-TA33a

Corbier¹,

Krier²,

Mulliert³

et al. 2001

Appl Environ Microbiol

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The antibacterial spectra and modes of action of synthetic peptides corresponding to mesenterocin 52B and leucocin B-TA33a greatly differ despite their high sequence homology. Circular dichroism experiments establish the capacity of each of these two peptides to partly fold into an amphiphilic helix that might be crucial for their adsorption at lipophilic-hydrophilic interfaces.Among the various antimicrobial compounds produced by lactic acid bacteria, bacteriocins are bioactive single polypeptides or polypeptide complexes that are active against closely related bacterial species (14,15,22). These bacteriocins constitute a large family of metabolites, which can be subdivided into different classes based on their modes of action and their structures (14). In particular, class II bacteriocins are small, heat-stable, non-lanthionine-containing peptides, varying between 30 and 60 residues in length (Ͻ10 kDa) (8). Subgroups have been defined within class II, notably the class IIa bacteriocins, which contain a consensus YGNGV amino acid motif near the N terminus and are active against Listeria spp. Within the class IIa bacteriocins produced by some Leuconostoc strains (11,12,18,20), the closely related leucocin A and mesentericin Y105 have been the subject of numerous studies, including conformational ones (9, 10). In low-polarity medium, mesentericin Y105 was found to be partially folded as an amphipathic helix spanning over residues 17 to 31 (9), and leucocin A is proposed to adopt an amphiphilic ␣-helical conformation in its C-terminal region, whereas the N-terminal part would fold into a three-stranded anti-parallel ␤-sheet conformation (10).Within the Leuconostoc genus, some strains have been recently shown to produce more than one bacteriocin. In addition to mesenterocin 52A, which is identical to mesentericin Y105, Leuconostoc mesenteroides subsp. mesenteroides FR52 produces the 32-mer polypeptide mesenterocin 52B (20). The same bacteriocin has also been detected in culture extracts of L. mesenteroides Y105 (1). L. mesenteroides strain TA33a actually produces three different bacteriocins: class IIa leucocin A-TA33a, leucocin B-TA33a, and leucocin C-TA33a, a new anti-Listeria bacteriocin (18,19). It is noteworthy that mesenterocin 52B and leucocin B-TA33a display narrow spectra of activity limited to the genera Leuconostoc and Weissella (18,19,20). Thus, they can be distinguished from other metabolites produced by Leuconostoc sp. strains (11,12,19,20). The primary structures of the two bacteriocins are presented in Table 1. By shifting the mesenterocin 52B sequence forward by two positions, identical amino acids appear in 17 positions and lead to a 63% identity score between the two peptides. The similarity is most obvious in the central domain of the peptide, where the LTGPQQP motif is present in the two bacteriocins. As both mesenterocin 52B and leucocin B-TA33a are small heat-stable and non-lanthionine-containing peptides, their classification as bacteriocins from class II is obvious. Yet, in addition to the...

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Section: Resultsmentioning

confidence: 81%

Biological Activities and Structural Properties of the Atypical Bacteriocins Mesenterocin 52B and Leucocin B-TA33a

Corbier¹,

Krier²,

Mulliert³

et al. 2001

Appl Environ Microbiol

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“…• C. This observation is related to the lowering effect of this kind of additive on the CMC (4,(13)(14)(15).The micellar solution with no additive was studied at 30…”

Section: Methodsmentioning

confidence: 98%

Micellar Solubilization: Structural and Conformational Changes Investigated by 1H and 13C Liquid-State NMR

Alonso

Harris

Kenwright

2002

Journal of Colloid and Interface Science

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“…The degree of ionization in the micelle (α) and the degree of counter ion binding, β = (1 − α) of both (SDS) and (SLES) as a function of mole fraction of alcohol at different temperatures were calculated as in the following equation [5]:…”

Section: Concentration Dependence Of Conductivitymentioning

confidence: 99%

“…The variation of the CMC with chemical and physical parameters provides good insights into the nature of the surfactant self-association. The physical methods for CMC determination includes conductivity, solubility, viscosity, light scattering, measuring the surface tension by Wiebelmy slide method or by the method of maximum bubble pressure, measurement of ion activity and by dye incorporation method, Gel filtration spectrophtometrically and counter ion magnetic resonance [2][3][4][5][6]. Some authors had been used the conductivity measurements to study the micellization of; SDS surfactant in water and in propanol-water mixed solvent [7][8][9][10][11][12], other surfactant [13,14] and ionic liquids [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Solvation thermodynamic parameters for sodium dodecyl sulfate (SDS) and sodium lauryl ether sulfate (SLES) surfactants in aqueous and alcoholic-aqueous solvents

El–Dossoki

Gomaa

Hamza³

2019

SN Appl. Sci.

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Conductivity of sodium dodecyl sulfate (SDS) and sodium lauryl ether sulfate (SLES) surfactants in aqueous and in alcoholic-aqueous mixed solvents (methanol, ethanol, and glycerol) with different mole fractions of alcohols has been measured experimentally at different temperatures (298.15, 303.15, 308.15 and 313.15 K). Surface tension was also measured experimentally for SDS and SLES in aqueous solution at 298.15 K. Critical micelle concentration (CMC) of both SDS and SLES was determined from the measured conductivity and surface tension data. The CMC was found to increase as the temperature and alcohol mole fraction increased in all solvents used. Depending on the conductivity data, the association constant (K a ) of both SDS and SLES was also determined applying Shedlowsky conductance equation. The thermodynamic parameters (ΔG˚, ΔH˚, and ΔS˚) of the micellization and association processes were evaluated from the temperature dependence of micellization and association constants. The results indicate that the association constant of both SDS and SLES decrease as the temperature and alcohol mole fraction increased in all solvents used. Also it was found that CMC and K a of both SDS and SLES increase in the order: methanol > ethanol > glycerol. The association process was found to be spontaneous one. The density and refractive index of both SDS and SLES in aqueous and in alcoholicaqueous mixed solvents (methanol, ethanol, and glycerol) with different mole fractions of alcohols, has been measured experimentally at 298.15 K. Depending on the density data, the molar volume of the two surfactants was determined and discussed. Also depending on the refractive index data, the molar refraction and the polarizability of both SDS and SLES was calculated and discussed. A computer programs were used for all calculations.

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Effect of Temperature on the Mixed Micellar Tetradecyltrimethylammonium Bromide–Butanol System

Cited by 28 publications

References 26 publications

Biological Activities and Structural Properties of the Atypical Bacteriocins Mesenterocin 52B and Leucocin B-TA33a

Biological Activities and Structural Properties of the Atypical Bacteriocins Mesenterocin 52B and Leucocin B-TA33a

Micellar Solubilization: Structural and Conformational Changes Investigated by 1H and 13C Liquid-State NMR

Solvation thermodynamic parameters for sodium dodecyl sulfate (SDS) and sodium lauryl ether sulfate (SLES) surfactants in aqueous and alcoholic-aqueous solvents

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