Association of sodium dodecyl sulfate in aqueous solutions according to chemical shifts in 1H NMR spectra

Idiyatullin, B. Z.; Potarikina, K. S.; Zuev, Yu. F.; Зуева, О. С.; Us’yarov, O. G.

doi:10.1134/s1061933x13050037

Cited by 26 publications

(7 citation statements)

References 28 publications

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“…Spectroscopic measurements of aqueous solutions with emulsifiers showed additional signals for polysorbate at 0.9 ppm, 1.3 ppm, and 3.7 ppm and for SDS at 0.9 ppm, 1.3 ppm, 1.7 ppm, and 4.2 ppm. Similar results were reported in previous spectrometer studies [ 22 , 23 ]. Especially the resonances at 1.3 ppm and 0.9 ppm, which are usually seen in triglycerides, are considered to be critical with regard to fat quantification.…”

Section: Discussionsupporting

confidence: 92%

A comparison of emulsifiers for the formation of oil-in-water emulsions: stability of the emulsions within 9 h after production and MR signal properties

Fritz

Martirosian

Machann

et al. 2021

Magn Reson Mater Phy

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Objective To provide a basis for the selection of suitable emulsifiers in oil-in-water emulsions used as tissue analogs for MRI experiments. Three different emulsifiers were investigated with regard to their ability to stabilize tissue-like oil-in-water emulsions. Furthermore, MR signal properties of the emulsifiers themselves and influences on relaxation times and ADC values of the aqueous phase were investigated. Materials and methods Polysorbate 60, sodium dodecyl sulfate (SDS) and soy lecithin were used as emulsifiers. MR characteristics of emulsifiers were assessed in aqueous solutions and their function as a stabilizer was examined in oil-in-water emulsions of varying fat content (10, 20, 30, 40, 50%). Stability and homogeneity of the oil-in-water emulsions were evaluated with a delay of 3 h and 9 h after preparation using T1 mapping and visual control. Signal properties of the emulsifiers were investigated by 1H-MRS in aqueous emulsifier solutions. Relaxometry and diffusion weighted MRI (DWI) were performed to investigate the effect of various emulsifier concentrations on relaxation times (T1 and T2) and ADC values of aqueous solutions. Results Emulsions stabilized by polysorbate 60 or soy lecithin were stable and homogeneous across all tested fat fractions. In contrast, emulsions with SDS showed a significantly lower stability and homogeneity. Recorded T1 maps revealed marked creaming of oil droplets in almost all of the emulsions with SDS. The spectral analysis showed several additional signals for polysorbate and SDS. However, lecithin remained invisible in 1H-MRS. Relaxometry and DWI revealed different influences of the emulsifiers on water: Polysorbate and SDS showed only minor effects on relaxation times and ADC values of aqueous solutions, whereas lecithin showed a strong decrease in both relaxation times (r1,lecithin = 0.11 wt.%−1 s−1, r2,lecithin = 0.57 wt.%−1 s−1) and ADC value (Δ(ADC)lecithin = − 0.18 × 10–3 mm2/s⋅wt.%) with increasing concentration. Conclusion Lecithin is suggested as the preferred emulsifier of oil-in-water emulsions in MRI as it shows a high stabilizing ability and remains invisible in MRI experiments. In addition, lecithin is suitable as an alternative means of adjusting relaxation times and ADC values of water.

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Section: Discussionsupporting

confidence: 92%

A comparison of emulsifiers for the formation of oil-in-water emulsions: stability of the emulsions within 9 h after production and MR signal properties

Fritz

Martirosian

Machann

et al. 2021

Magn Reson Mater Phy

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“…1 H NMR spectra of PIn with surfactants (SDS, CTAB and TW80) fixed at 1:0.05 of N indole /N surfactant mole ratio were analyzed. The main 1 H NMR spectra of these surfactants were also present namely the À ÀOCH 2 CH 2 OÀ À of TW80 at 3.45 ppm [37], the (CH 2 ) n of SDS located at 1.22 ppm [38], and the CH 3 À ÀN of CTAB present at 3.00 ppm [39]. These results indicate that the PIn structure is comprised of surfactant molecules.…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 74%

Synthesis of nano-sized polyindole via emulsion polymerization and doping

Phasuksom

Sirivat

2016

Synthetic Metals

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“…All the protons of SDS were labeled with corresponding proton peak in 1D 1 H NMR (Figure 5B). 22 Because of the complexity of the keratin hydrolysate structure, the proton labeling was not completed for keratin hydrolysates. After the peak assignment of SDS protons in the SDS/keratin hydrolysate mixture, cross peaks which correlate different protons were numbered in 2D NOESY (Figure 5C).…”

Section: Resultsmentioning

confidence: 99%

“…Figure shows the molecular structure, 1D 1 H NMR and 2D NOESY spectra of keratin hydrolysate/SDS mixture. All the protons of SDS were labeled with corresponding proton peak in 1D 1 H NMR (Figure B) . Because of the complexity of the keratin hydrolysate structure, the proton labeling was not completed for keratin hydrolysates.…”

Section: Results and Discussionmentioning

confidence: 99%

Effect of Surfactant–Keratin Hydrolysate Interactions on the Hydration Properties of a Stratum Corneum Substitute

2020

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A novel stratum corneum substitute (SCS) has been developed, and the fundamental mechanism of the dehydration process has been studied using the SCS. After washing with cleansers which contain surfactants, our skin “feels” dehydrated (or hydrated). Although many studies have focused on the effect of surfactants on the regulation of the water loss by the lipid bilayers in the stratum corneum (SC) for a long timescale or at equilibrium, only few studies have focused on the acute effect of the surfactant interaction on dehydration. In addition, the interaction between the surfactant and keratin has been often underappreciated compared to lipid bilayers although keratin is the major nonaqueous component of the SC. Here, we have developed novel SCS models, nonkeratinized (lipid only) and keratinized, to study the effect of keratin hydrolysates on the dehydration rate. We have confirmed that the lipid organizational structure of the SCS was similar to that of the human SC using X-ray scattering. We have revealed that keratin hydrolysates play a significant role in the dehydration rate, accelerating the rate for the short term. We have also demonstrated that the effect of surfactants on dehydration is more pronounced for keratinized samples than that for the nonkeratinized sample. However, the dehydration rate for the nonkeratinized SCS with the surfactant became faster than the that for the keratinized SCS after the 20 min evaporation process, suggesting that the water binding sites of keratin hydrolysates slowed down evaporation, while the surfactant interacting with the lipids accelerated the water loss. Lastly, the study demonstrated that the SCS model can be a great platform to test macroscopic properties and analyze the underlying mechanism at the molecular level for various chemicals.

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Association of sodium dodecyl sulfate in aqueous solutions according to chemical shifts in 1H NMR spectra

Cited by 26 publications

References 28 publications

A comparison of emulsifiers for the formation of oil-in-water emulsions: stability of the emulsions within 9 h after production and MR signal properties

A comparison of emulsifiers for the formation of oil-in-water emulsions: stability of the emulsions within 9 h after production and MR signal properties

Synthesis of nano-sized polyindole via emulsion polymerization and doping

Effect of Surfactant–Keratin Hydrolysate Interactions on the Hydration Properties of a Stratum Corneum Substitute

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