Mass spectrometric characterization of the non-ionic gemini surfactant Surfynol 465 and a microcalorimetric study of its micelle formation in water

Páhi, Annamária B.; Király, Zoltán; Puskás, Sándor

doi:10.1016/j.colsurfa.2009.05.009

Cited by 14 publications

(5 citation statements)

References 31 publications

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“…Three surfactant levels were used to produce the 20 µM curcumin-surfactant stock solutions: 92, 184, and 276 mM for S465 and 0.072, 0.24, and 0.36 mM for T80. The CMC of pure S465 and T80 have been reported to be around 10.5 mM or 11-16 mM [33,34] and 0.014 mM [25], respectively. Hence, a 1:20 dilution of the stock solution allows curcuminsurfactant solutions to be produced with surfactant concentrations below, near, and above the CMC.…”

Section: Influence Of Surfactant Level On Curcumin Stability In the Stock Solutionsmentioning

confidence: 99%

Use of Micellar Delivery Systems to Enhance Curcumin’s Stability and Microbial Photoinactivation Capacity

Ryu

Ruiz-Ramirez

Chuesiang

et al. 2021

Foods

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Microbial photoinactivation using ultraviolet (UV) or visible light can be enhanced by photosensitizers. This study assessed the efficacy of encapsulating a food-grade photosensitizer (curcumin) in surfactant micelles on its water dispersibility, chemical stability, and antimicrobial activity. Stock curcumin-surfactant solutions were prepared with Surfynol 465 (S465) or Tween 80 (T80) (5 mM sodium citrate buffer). The antimicrobial activity of curcumin-loaded surfactant solutions was determined by monitoring the inactivation of Escherichia coli O157: H7 and Listeria innocua after 5-min irradiation with UV-A light (λ = 365 nm). The solutions mixed with the bacterial suspensions contained 1 µM curcumin and each surfactant below, near, and above their critical micelle concentrations (CMCs). The addition of surfactants at any level to the curcumin solution enhanced its dispersibility, stability, and efficacy as a photosensitizer, thereby enhancing its antimicrobial activity. Gram-positive bacteria were more susceptible than Gram-negative bacteria when curcumin-loaded micelles were used against them. The photoinactivation efficacy of curcumin-surfactant solutions depended on the pH of the solution (low > high), surfactant type (S465 > T80), and the amount of surfactant present (below CMC ≥ near CMC > above CMC = unencapsulated curcumin). This result suggests that excessive partitioning of curcumin into micelles reduced its ability to interact with microbial cells. Synergistic antimicrobial activity was observed when S465 was present below or near the CMC with curcumin at pH 3.5, which could be attributed to a more effective interaction of the photosensitizer with the cell membranes as supported by the fluorescence lifetime micrographs. The use of a micelle-based delivery system facilitates adsorption and generation of reactive oxygen species in the immediate environment of the microbial cell, enhancing photoinactivation.

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Section: Influence Of Surfactant Level On Curcumin Stability In the Stock Solutionsmentioning

confidence: 99%

Use of Micellar Delivery Systems to Enhance Curcumin’s Stability and Microbial Photoinactivation Capacity

Ryu

Ruiz-Ramirez

Chuesiang

et al. 2021

Foods

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“…As described above, olfin E1020, olfin PD201, and surfynol 465 are gemini surfactants, which can be viewed as bis-surfactants, where two amphiphilic molecules are connected by a short spacer (Holmberg, 2003). In general, gemini surfactants are highly efficient in lowering the critical micelle concentration (CMC) (Páhi et al, 2009). Olfin E1020 (m + n = 20) and surfynol 465 (m + n = 30) are 2,4,7,9-tetramethyl-5-decyne-4 and 7-diol-di(polyoxyethylene) ether, respectively, while olfin PD201 is a mixture consisting primarily of the ether and propylene glycol.…”

Section: Chemicalsmentioning

confidence: 99%

Extinguishing pool fires with aqueous ferrocene dispersions containing gemini surfactants

Koshiba

Ohtani

2016

Journal of Loss Prevention in the Process Industries

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The objective of the present study was to explore the relationship between the dispersibility and fire-extinguishing capability of aqueous ferrocene dispersions containing gemini surfactants belonging to the same series, namely, olfin E1020, olfin PD 201, and surfynol 465. In this study, the dispersibility and ability to suppress pool fires were characterized by turbidity and extinguishing time, respectively. Ultrasonication enabled easy preparation of the aqueous dispersions of ferrocene powder containing the gemini surfactants. Visual observations and turbidity measurements clearly demonstrated that the order of dispersibility was as follows: ferrocene dispersion containing surfynol 465 ≥ ferrocene dispersion containing olfin E1020 > ferrocene dispersion containing olfin PD201. Fire suppression experiments indicated that the ferrocene diameter, in the ferrocene diameter range of 10.4-21.5 m, negligibly influenced the extinguishing time. Furthermore, for the same ferrocene samples as were used for the turbidity measurements, the order of extinguishing ability was as follows: ferrocene dispersion containing surfynol 465 > ferrocene dispersion containing olfin E1020 > ferrocene dispersion containing olfin PD201; thus, the extinguishing ability was identical to the dispersibility order.

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“…Binding constants from 10 3 to 10 8 M À1 can be accurately measured [15]. Titration microcalorimetry is a powerful and indispensable experimental technique that allows simultaneous determination of the enthalpy change, the stoichiometry and the equilibrium constant of complexation from a single run [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of inclusion complex formation of β-cyclodextrin with a variety of surfactants differing in the nature of headgroup

Benkő

Király

2012

The Journal of Chemical Thermodynamics

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Mass spectrometric characterization of the non-ionic gemini surfactant Surfynol 465 and a microcalorimetric study of its micelle formation in water

Cited by 14 publications

References 31 publications

Use of Micellar Delivery Systems to Enhance Curcumin’s Stability and Microbial Photoinactivation Capacity

Use of Micellar Delivery Systems to Enhance Curcumin’s Stability and Microbial Photoinactivation Capacity

Extinguishing pool fires with aqueous ferrocene dispersions containing gemini surfactants

Thermodynamics of inclusion complex formation of β-cyclodextrin with a variety of surfactants differing in the nature of headgroup

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