Interaction Between GMAC-m-CS and Surfactants: Surface Tension and Conductivity Methods

Zhang, Chuanguang; Yang, Xiaodeng; Wang, Shijie; Li, Junying; Cui, Yuezhi; Li, Tianduo

doi:10.1080/01932691.2015.1015543

Cited by 3 publications

(7 citation statements)

References 31 publications

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“…Meanwhile, a high temperature promotes the adsorption of DDEAC molecules on the solution surface and decrease of surface tension [ 36 ]. The result is consistent with that of GMAC-m-CS/C14mimBr [ 24 ].…”

Section: Results and Dissolutionsupporting

confidence: 90%

“…The peak at 1656 cm −1 in spectrum i is very weak. According to previous result [ 24 ], the peaks at 1656 cm −1 and 1592 cm −1 belong to

of tertiary amine and primary amine, respectively. The weakening of the peak intensity at 1592 cm −1 and the strengthening of peak intensity at 1656 cm −1 indicate that the nucleophilic substitution reaction occurred at the –NH 2 group.…”

Section: Results and Dissolutionsupporting

confidence: 55%

“…The amount of DDEAC absorbed on GTA-m-CS could be calculated from the linear relationship of cmc (GTA-m-CS) -cmc (DDEAC) vs. c GTA-m-CS ( Figure 2 C), and the slope is the amount of absorbed DDEAC [ 24 ]. The fitted linear equation is as Equation (4), from which the absorbed amount at 20 °C is calculated as 2.45 × 10 −4 mmol/mg.…”

Section: Results and Dissolutionmentioning

confidence: 99%

“…Table 3 shows that the β value of DDEAC is much lower than those of GTA-m-CS/DDEAC systems, indicating that the GTA-m-CS/DDEAC micelles are larger than that of DDEAC, and the micelle size of GTA-m-CS/DDEAC is almost unaffected by GTA-m-CS concentration. This is ascribed to the hydrophobic interaction between DDEAC and methyl groups in

, and the electrostatic repulsion between the

groups [ 24 ]. The result is consistent with that glycidyl trimethyl ammonium chloride-modified chitosan/1-tetradecyl-3-methylimidazolium bromide system [ 24 ].…”

Section: Results and Dissolutionmentioning

confidence: 99%

“…N -Glycidyltrimethyl ammonium chloride-modified chitosan (GTA-m-CS) was synthesized according to the method reported in previous works [ 21 , 24 ]. N , N -dimethyl- N -dodecyl- N -(2,3-epoxy propyl) ammonium chloride (DDEAC) was synthesized in our laboratory.…”

Section: Methodsmentioning

confidence: 99%

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Studies on Intermolecular Interaction of N-Glycidyltrimethyl Ammonium Chloride Modified Chitosan/N,N-Dimethyl-N-dodecyl-N-(2,3-epoxy propyl) Ammonium Chloride and Curcumin Delivery

Zhang

Xing

et al. 2022

Polymers

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Chitosan has potential applications in many fields, due to its biocompatibility, biodegradability and reproducibility. However, the insolubility in water restricts its wide application. In order to expand the application of chitosan in the delivery of oil-soluble drugs and improve the efficacy of oil-soluble drugs, N-Glycidyltrimethyl ammonium chloride-modified chitosan (GTA-m-CS) and N,N-Dimethyl-N-dodecyl-N-(1,2-epoxy propyl) ammonium chloride (DDEAC), a kind of reactive surfactant, were synthesized and characterized by FTIR, NMR and XRD methods. The interactions between GTA-m-CS and DDEAC was studied by surface tension, viscosity, conductivity and fluorescence methods. The parameters, including equilibrium surface tension, critical micelle concentrations of DDEAC with different GTA-m-CS concentration, critical aggregation concentration of DDEAC, the amount of DDEAC adsorbed on GTA-m-CS, pc20 and πcmc were obtained from the surface tension curves. The influence of temperature on the above parameters were evaluated. The degree of counterion binding to micelle and the thermodynamic parameters of the system were calculated from the conductivity curves. According to the change of conductivity with temperature, the thermodynamic parameters of micellar formation were calculated. The aggregation number of DDEAC molecules in GTA-m-CS/DDEAC aggregates were calculated from steady-state fluorescence data. Based on the experimental results, the interaction models between GTA-m-CS and DDEAC were proposed. The GTA-m-CS/DDEAC aggregates could be used as curcumin carries, and achieved sustained release.

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Section: Results and Dissolutionsupporting

confidence: 90%

“…The peak at 1656 cm −1 in spectrum i is very weak. According to previous result [ 24 ], the peaks at 1656 cm −1 and 1592 cm −1 belong to

Section: Results and Dissolutionsupporting

confidence: 55%

Section: Results and Dissolutionmentioning

confidence: 99%

, and the electrostatic repulsion between the

groups [ 24 ]. The result is consistent with that glycidyl trimethyl ammonium chloride-modified chitosan/1-tetradecyl-3-methylimidazolium bromide system [ 24 ].…”

Section: Results and Dissolutionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Studies on Intermolecular Interaction of N-Glycidyltrimethyl Ammonium Chloride Modified Chitosan/N,N-Dimethyl-N-dodecyl-N-(2,3-epoxy propyl) Ammonium Chloride and Curcumin Delivery

Zhang

Xing

et al. 2022

Polymers

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show abstract

The study on the relationship between the molecular structures of chitosan derivatives and their hydrate inhibition performance

Zhang

Shen

et al. 2022

Journal of Molecular Liquids

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Examination and Improvement of Undergraduate Laboratory Experiment: Thermodynamics of a Surfactant Micellization

et al. 2020

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Thermodynamic characterization of micelle formation from an ionic surfactant in aqueous solutions is a classic experiment in physical chemistry. The critical micelle concentration (CMC) and the degree of micelle ionization (α) can be directly obtained by conductimetry, then thermodynamic parameters (ΔG m o, ΔH m o, ΔS m o) are deduced from the CMC values at different temperatures. Herein, the CMC values at different temperatures were generated by multiple student groups, and the resulting errors were combined with the enthalpy calculation error for micelle formation (ΔH m o). Under the presented model it was found that ΔH m o data were very difficult to obtain using the conductivity method. The isothermal titration microcalorimetry (ITC) method gave a direct ΔH m o value, which was incorporated into the experiment to determine the accuracy of the surveyed data. The introduction, design, and improvement of a “thermodynamics of 1-tetradecyl-3-methylimidazolium bromide (C14mimBr) micellization” experiment using conductivity and ITC methods were proposed, which may also improve students’ experimental ability, practical skills, and quality of research.

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Interaction Between GMAC-m-CS and Surfactants: Surface Tension and Conductivity Methods

Cited by 3 publications

References 31 publications

Studies on Intermolecular Interaction of N-Glycidyltrimethyl Ammonium Chloride Modified Chitosan/N,N-Dimethyl-N-dodecyl-N-(2,3-epoxy propyl) Ammonium Chloride and Curcumin Delivery

Studies on Intermolecular Interaction of N-Glycidyltrimethyl Ammonium Chloride Modified Chitosan/N,N-Dimethyl-N-dodecyl-N-(2,3-epoxy propyl) Ammonium Chloride and Curcumin Delivery

The study on the relationship between the molecular structures of chitosan derivatives and their hydrate inhibition performance

Examination and Improvement of Undergraduate Laboratory Experiment: Thermodynamics of a Surfactant Micellization

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