Proton magic-angle spinning–NMR investigation of surfactant aqueous suspensions

Triba, Mohamed N.; Traı̈kia, Mounir; Warschawski, Dror E.; Nicolas-Morgantini, Luc; Lety, A.; Gilard, Patrick; Devaux, Philippe F.

doi:10.1016/j.jcis.2004.01.013

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…Nuclear magnetic resonance (NMR) spectroscopy can provide information on the localization of a solubilizate within a surfactant micelle since NMR chemical shift depend on the molecular environment of the nuclei. [25][26][27][28][29][30][31] Proton NMR spectroscopy is a particularly useful tool to investigate solubilization processes since 1 H is an abundant but sensitive nucleus that allows for the differentiation of molecules in heterogeneous mixtures. For example, 1 H NMR spectroscopy has have been used to elucidate the predominant solubilization site of eugenol in SDS micelles and authors reported very sharp and well-resolved NMR signals of eugenol and other aromatic compounds in SDS micelles with particularly large upfield shifts of the surfactant methylene groups upon inclusion of aromatic compounds carrying a phenolic hydroxyl group.…”

Section: Structural Changes In Micelles Upon Inclusion Of Antimicrobialmentioning

confidence: 99%

Formulation and Characterization of Phytophenol-Carrying Antimicrobial Microemulsions

et al. 2007

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Phytophenols were solubilized in nonionic surfactant micelles to form antimicrobially active and thermodynamically stable microemulsions. Formulation of phytophenols in microemulsions has previously been shown to improve their antimicrobial activity in model microbiological and food systems. Carvacrol and eugenol were incorporated in micellar solutions of two nonionic surfactants (Surfynol® 485W and Surfynol® 465) by mixing at room temperature. Particle size of formed microemulsions was determined by dynamic light scattering, and structural information about the mixed micellar system was obtained by nuclear magnetic resonance spectroscopy (NMR). Uptake of carvacrol and eugenol in surfactant micelles as determined by ultrasonic velocity measurements was very rapid, e.g., below the maximum additive concentration, the phytophenols were completely solubilized in the micelles in less than 30 min. Depending on the surfactant-phytophenol combination, the self-assembled surfactant-phytophenol aggregates had mean particle diameters between 3 and 17 nm. Elucidation of the structure of aggregates by 1H NMR studies indicated that micelles had a "bracket-like" structure with phytophenols being located inside the palisade layer of the micelle in direct contact with adjacent surfactant monomers. Encapsulation of phytophenols in surfactant micelles enables the incorporation of large amounts of hydrophobic antimicrobials in aqueous phases. Formulation of antimicrobial microemulsions may thus offer a means to deliver high concentrations of phytophenols to the bacterial surfaces of foodborne pathogens to affect kill.

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Section: Structural Changes In Micelles Upon Inclusion Of Antimicrobialmentioning

confidence: 99%

Formulation and Characterization of Phytophenol-Carrying Antimicrobial Microemulsions

et al. 2007

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“…To improve the resolution of pSt-PYGK, several solutions were considered; (1) alteration solitary organic solvents (2) mixtures of organic solvents like CDCl 3, CD 3 OD, and DMSO-d 6 , (3) mixtures of CDCl 3 with protic solvents (4) Influence of transversal relaxation time on signal intensity. 22,23 In this work, (3) was used to improve the resolution. All of the peptide peaks could be observed between 2 and 5 ppm in CDCl 3 /CD 3 OD mixture supporting the successful formation of peptide-polystyrene hybrid structures.…”

Section: 폴리머 제38권 제4호 2014년mentioning

confidence: 99%

Solid Phase Synthesis of Lysine-exposed Peptide-Polymer Hybrids by Atom Transfer Radical Polymerization

Ha¹,

Kim²,

Kim³

et al. 2014

Polymer Korea

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Recently, the peptide(or protein)-polymer hybrid materials (PPs) were sought in many research areas as potential building blocks for assembling nanostructures in selective solvents. In PPs, the facile routes of preparing well-defined peptide-polymer bio-conjugates and their specific activities in various applications are important issues. Our strategy to prepare the peptide-polymer hybrid materials was to combine atom transfer radical polymerization (ATRP) method with solid phase peptide synthesis. The standard solid phase peptide synthesis method was employed to prepare the PYGK (proline-tyrosine-glycine-lysine) peptide. PYGK is an analogue peptide, PFGK (proline-phenylalanine-glycine-lysine), which interacted with plasminogen in fibrinolysis. The peptide and the peptide-initiator were characterized with MALDI-TOF mass spectrometry and 1 H NMR spectrometer. The peptide-polymer, pSt-PYGK was characterized by GPC, IR, 1 H NMR spectrometer and TLC. Spherical micellar aggregates were determined by TEM and SEM. Current synthesis methodology suggested opportunities to create the well-defined peptide-polymer hybrid materials with specific binding activity.

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High-Resolution Magic Angle Spinning—Enabling Applications of NMR Spectroscopy to Semi-Solid Phases

Power

2011

Annual Reports on NMR Spectroscopy

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Proton magic-angle spinning–NMR investigation of surfactant aqueous suspensions

Cited by 3 publications

References 20 publications

Formulation and Characterization of Phytophenol-Carrying Antimicrobial Microemulsions

Formulation and Characterization of Phytophenol-Carrying Antimicrobial Microemulsions

Solid Phase Synthesis of Lysine-exposed Peptide-Polymer Hybrids by Atom Transfer Radical Polymerization

High-Resolution Magic Angle Spinning—Enabling Applications of NMR Spectroscopy to Semi-Solid Phases

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