Study of the premicellar state in aqueous solutions of sodium dodecyl sulfate by nuclear magnetic resonance diffusion

Архипов, В. П.; Arkhipov, Ruslan V.; Kuzina, Natalia A.; Филиппов, А. В.

doi:10.1002/mrc.5165

Cited by 9 publications

(6 citation statements)

References 35 publications

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“…According to the Stokes-Einstein equation, the hydrodynamic radii of kinetic units of SDS and Brij35 in aqueous solutions at varied concentrations for α SDS = 0.8 were calculated according to the diffusion coefficients and are shown in Table S1 . At low concentrations of 0.25 and 0.50 mM, the hydrodynamic radii of kinetic units of SDS are 0.430 nm, corresponding to the effective hydrodynamic radii of SDS monomers, which is very close to the literature data of 0.35 nm [ 54 ]. From the size of two kinds of aggregates (0.573 and 1.87 nm at C T = 2 mM, 1.00 and 3.31 nm at C T = 5 mM), the size of the Brij35-rich micelles is about three times that of the SDS-rich micelles.…”

Section: Resultssupporting

confidence: 87%

Mechanism of the Micellar Solubilization of Curcumin by Mixed Surfactants of SDS and Brij35 via NMR Spectroscopy

Zhan

Chen

et al. 2022

Molecules

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The micellar solubilization mechanism of curcumin by mixed surfactants of SDS and Brij35 was investigated at the molecular scale by NMR spectroscopy. Through the investigation of the micelle formation process, types and structures of mixed micelles and solubilization sites, the intrinsic factors influencing the solubilization capacity were revealed. For systems with αSDS = 0.5 and 0.2, the obtained molar solubilization ratios (MSRs) are consistent with the MSRideal values. However, for αSDS = 0.8, the solubilization capacity of curcumin is weakened compared to the MSRideal. Furthermore, only one single mixed SDS/Brij35 micelles are formed for αSDS = 0.5 and 0.2. However, for αSDS = 0.8, there are separate SDS-rich and Brij35-rich mixed micelles formed. In addition, NOESY spectra show that the interaction patterns of SDS and Brij35 in mixed micelles are similar for three systems, as are the solubilization sites of curcumin. Therefore, for αSDS = 0.5 and 0.2 with single mixed micelles formed, the solubility of curcumin depends only on the mixed micelle composition, which is almost equal to the surfactant molar ratio. Although curcumin is solubilized in both separate micelles at αSDS = 0.8, a less stable micelle structure may be responsible for the low solubility. This study provides new insights into the investigation and application of mixed micelle solubilization.

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Section: Resultssupporting

confidence: 87%

Mechanism of the Micellar Solubilization of Curcumin by Mixed Surfactants of SDS and Brij35 via NMR Spectroscopy

Zhan

Chen

et al. 2022

Molecules

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“…While FRAP is a very flexible approach, single-particle tracking (SPT), , fluorescence correlation spectroscopy (FCS), image correlation spectroscopy (ICS), raster image correlation spectroscopy (RICS), and nuclear magnetic resonance (NMR) diffusometry are also other methods for determining molecular motion. FRAP has shown to be a very valuable complement to FCS and SPT, which both need extremely dilute samples (usually in the nanomolar range).…”

Section: Comparable Methodsmentioning

confidence: 99%

Fluorescence Recovery after Photobleaching in Colloidal Science: Introduction and Application

Moud

2022

ACS Biomater. Sci. Eng.

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FRAP (fluorescence recovery after photo bleaching) is a method for determining diffusion in material science. In industrial applications such as medications, foods, Medtech, hygiene, and textiles, the diffusion process has a substantial influence on the overall qualities of goods. All these complex and heterogeneous systems have diffusion-based processes at the local level. FRAP is a fluorescence-based approach for detecting diffusion; in this method, a high-intensity laser is made for a brief period and then applied to the samples, bleaching the fluorescent chemical inside the region, which is subsequently filled up by natural diffusion. This brief Review will focus on the existing research on employing FRAP to measure colloidal system heterogeneity and explore diffusion into complicated structures. This description of FRAP will be followed by a discussion of how FRAP is intended to be used in colloidal science. When constructing the current Review, the most recent publications were reviewed for this assessment. Because of the large number of FRAP articles in colloidal research, there is currently a dearth of knowledge regarding the growth of FRAP’s significance to colloidal science. Colloids make up only 2% of FRAP papers, according to ISI Web of Knowledge.

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“…The calculation of the hydrodynamic radius are based on the diffusion coefficient of Aβ(25−35) and SDS detergent, respectively, using 1,4-dioxane as a reference resulted in a 26 Å hydrodynamic radius [ 51 ]. This value corresponds to the R h calculated for SDS micelles in water [ 52 , 53 , 54 ]. It is constant for all the experimental conditions, and as is common to SDS and Aβ(25−35) peptide, indicates an interaction of the peptide with the SDS micelles which is conserved over time.…”

Section: Resultsmentioning

confidence: 63%

Monitoring the Conformational Changes of the Aβ(25−35) Peptide in SDS Micelles: A Matter of Time

Santoro

Buonocore

Grimaldi

et al. 2023

IJMS

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Alzheimer’s disease is a neurodegenerative disease characterized by the formation of amyloid plaques constituted prevalently by amyloid peptides. Due to the well-known challenges related to the study in solution of these peptides, several membrane-mimicking systems such as micelle constituted by detergent—i.e., DPC and SDS—have been deeply investigated. Additionally, the strategy of studying short fragments instead of the full-length peptide turned out to be advantageous in exploring the structural properties of the different moieties in Aβ in order to reproduce its pathologic effects. Several studies reveal that among Aβ fragments, Aβ(25−35) is the shortest fragment able to reproduce the aggregation process. To enrich the structural data currently available, in the present work we decided to evaluate the conformational changes adopted by Aβ(25−35) in SDS combining CD and NMR spectroscopies at different times. From the solved structures, it emerges that Aβ(25−35) passes from an unordered conformation at the time of the constitution of the system to a more ordered and energetically favorable secondary structure at day 7, which is kept for 2 weeks. These preliminary data suggest that a relatively long time affects the kinetic in the aggregation process of Aβ(25−35) in a micellar system, favoring the stabilization and the formation of a soluble helix conformation.

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Study of the premicellar state in aqueous solutions of sodium dodecyl sulfate by nuclear magnetic resonance diffusion

Cited by 9 publications

References 35 publications

Mechanism of the Micellar Solubilization of Curcumin by Mixed Surfactants of SDS and Brij35 via NMR Spectroscopy

Mechanism of the Micellar Solubilization of Curcumin by Mixed Surfactants of SDS and Brij35 via NMR Spectroscopy

Fluorescence Recovery after Photobleaching in Colloidal Science: Introduction and Application

Monitoring the Conformational Changes of the Aβ(25−35) Peptide in SDS Micelles: A Matter of Time

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