Cationic micelles. Medical search. Frequent questions

In these mixtures, there is limited growth of the micelles with changes in composition, and vesicles abruptly begin to form at a characteristic mixing ratio of the two surfactants. (umn.edu)
This is in contrast to the first-order phase transition exhibited by other aqueous mixtures of oppositely charged surfactants, in which micelles first grow into extended threadlike micelles and samples intermediate to the micellar and vesicle phases separate into two macroscopic phases. (umn.edu)
Typical cationic surfactants are quaternized ammonium salts, for example cetyltrimethyl ammonium bromide (CTAB). (springer.com)
Under the chosen conditions these surfactants self-assemble to form giant polymer-like micelles, resulting in a strongly viscoelastic liquid. (edpsciences.org)
The stability of phospholipid lipomes interacting with micelle-forming surfactants was studied under physiological conditions (150 mM NaCl and pH=7.4 unless otherwise stated) mainly by use of cryo-TEM and fluorescence. (dissertations.se)
Surfactants come in four different types: Anionic, nonionic, cationic and amphoteric.Once you understand the differences between these different surfactant types, as well as how to classify them by their names, choosing the right cleaning products should be a snap. (cleanfax.com)
Cationic surfactants are less common in cleaners, and almost always absent from carpet products. (cleanfax.com)
Also, cationic surfactants have antimicrobial characteristics, and they are found in hard-surface disinfectants and cleaners. (cleanfax.com)
However, cationic surfactants have been shown to damage the mill-applied protectants on carpet, and are therefore strictly verboten in carpet products. (cleanfax.com)
Formulas containing cationic surfactants cannot be mixed with those containing oppositely charged anionic surfactants. (cleanfax.com)
For the nonionic surfactants, critical micelle concentration, cmc, and γ and θ above cmc decreased with decreasing EO chain length. (degruyter.com)
The aim of the study was to determine the relation between the biological activity of two homologous series of cationic gemini surfactants, which are quaternary ammonium salts, and their structure. (degruyter.com)
Four surfactants were studied, all with the same hydrophobic tail length but different headgroups: hexaethylene glycol mono-n-dodecyl ether (C12EO6, nonionic), sodium dodecyl sulfate (SDS, anionic), cocamidopropyl betaine (CapB, zwitterionic), and dodecyltrimethylammonium bromide (DTAB, cationic). (lu.se)
It is shown that the presence of large aliphatic moieties around the central phosphorus atoms of [P 44414 ]Cl results in a decrease in the electrostatic repulsion between the cationic moieties, leading the [P 44414 ] + cation to present a behaviour conventionally associated with non-ionic surfactants. (rsc.org)
The critical micelle concentration (CMC) of surfactants is among the most crucial physical properties of a chemical. (mee.nu)
There are four major groups of surfactants: anionic non-ionic, cationic, and. (mee.nu)
Surfactants are also classified into four main categories, which are anionic, cationic , and non-ionic. (mee.nu)
Cationic and non-ionic surfactants form mixed micelles and hence increase the CP. (bvsalud.org)
At higher concentrations, these surfactants also form mixed micelles and, due to charge opposite to the drug molecules, reduce the repulsion among micelles and act as CP suppressors. (bvsalud.org)
cmc values decreased with the addition of surfactants indicating mixed micelle formation. (bvsalud.org)
Experimental mole fraction of surfactants in micelle (X1) and their ideal values (X1 id) also support this explanation. (bvsalud.org)
The self-assembly of surfactants Cetyltrimethylammonium bromide (cationic), sodium octyl sulfate (anionic) and Tetraethylene glycol monododecyl ether (non-ionic) in PIL-water mixtures were probed to understand the solvation properties of PILs in the presence of water. (ens-lyon.fr)
Solubilization of two different types of organic dyes, Quinizarin with an anthraquinone structure and Sudan I with an azo structure, has been studied in aqueous solutions of a series of cationic gemini surfactants and of a conventional monomeric cationic surfactant, dodecyltrimethylammonium bromide (DTAB). (chalmers.se)
Dielectric relaxation studies of acetate buffer solutions of Sodium Dodecyl Sulphate (SDS- anionic), Cetyl Trimethyl Ammonium Bromide (CTAB- cationic), Tween 80 (TW-80-non-ionic), Betaine Anhydrous (BA- zwitterionic) surfactants have been examined in the frequency region between 1GHz and 25GHz for various concentrations of surfactants at the temperatures of 283, 288, 293 and 298K using time domain dielectric spectroscopy. (i-scholar.in)
The Arrhenius plot was used to calculate the enthalpy and entropy for the micelle forming surfactants. (i-scholar.in)
Three novel ester-amidoamine linked cationic surfactants bearing a double tail were synthesized. (i-scholar.in)

In this study, the interaction of the anion of quinapril (QUIN), angiotensin converting enzyme (ACE) inhibitor, with cationic surfactant cetyltrimethylammonium bromide (CTAB) was investigated. (ac.rs)
TY - JOUR AU - Čudina, Olivera AU - Janković, Ivana AU - Comor, Mirjana AU - Vladimirov, Sote PY - 2006 UR - https://farfar.pharmacy.bg.ac.rs/handle/123456789/712 AB - In this study, the interaction of the anion of quinapril (QUIN), angiotensin converting enzyme (ACE) inhibitor, with cationic surfactant cetyltrimethylammonium bromide (CTAB) was investigated. (ac.rs)
article{ author = "Čudina, Olivera and Janković, Ivana and Comor, Mirjana and Vladimirov, Sote", year = "2006", abstract = "In this study, the interaction of the anion of quinapril (QUIN), angiotensin converting enzyme (ACE) inhibitor, with cationic surfactant cetyltrimethylammonium bromide (CTAB) was investigated. (ac.rs)
The cationic micelles of cetyltrimethylammonium bromide, cetyldibenzylammonium chloride and cetylpyridinium chloride stabilize the tetrahedral intermediate formed in the hydrolysis of carboxylic esters (e.g. p -nitrophenylbenzoate) to a greater extent, preferring a$$B_{Ac^2 } $$ mechnism, than the anionic intermediate formed in the hydrolysis of m -nitrophenyl-N-N-diphenylphosphorodiamidate, which prefers a E 1cB mechanism. (ias.ac.in)

The correlation of the dynamics and mixed micelle formation ascertain us to apply the assembly to various purposes. (azpdf.net)

Persistence length of wormlike micelles from dynamic light scattering. (mpg.de)

Here we report the morphological transition from spherical micelles to vesicles observed in mixtures of dodecyltrimethylammonium chloride (DTAC) and sodium dodecylbenzenesulfonate (SDBS) as probed by the complementary techniques of quasielastic light scattering (QLS), NMR self-diffusion and relaxation measurements, and time-resolved fluorescence quenching (TRFQ) experiments. (umn.edu)
As the composition moves further into the vesicle region, the quantity of micelles decreases in proportion to the number of vesicles that form. (umn.edu)
Thus, in mixtures of DTAC and SDBS, the transition from micelles to vesicles is continuous. (umn.edu)
The approach taken was to study first the cationic vesicles by themselves. (dissertations.se)
Liquid interphases: Langmuir-Blodgett films, micelles, vesicles. (official-master-chemistry-uab.cat)

The binding of QUIN anion to CTAB micelles implied a shift in drug acidity constant (pK(a)(water) - pK(a)(micelle) = 1.39) proving the great affinity of negatively charged QUIN ion for the positively charged CTAB micelle surface. (ac.rs)
There are three types of lipids, anionic (negatively charged), neutral, or cationic (positively charged). (genetherapynet.com)

Synthesis of polymeric microcapsules by interfacial-suspension cationic photopolymerisation of divinyl ether monomer in aqueous suspension POLYMER CHEMISTRY. (nottingham.ac.uk)
For example, surface active substances can form micelles in an aqueous environment but these would not form in the same way in the organic solvent environment of the test. (europa.eu)
For example micelles form which consist of several clustered surfactant molecules that shield their non-polar chains from the surrounding aqueous phase with their polar head groups (see figure 3 ). (dataphysics-instruments.com)

Evidence of nearly rodlike micelles. (mpg.de)
This is the focus of recently published research by College of Engineering and Computer Science Ph.D. candidate Abhinanden Sambasivam, former post-doctoral researcher Ashish Sangria '11 of Intel and Distinguished Professor of Biomedical and Chemical Engineering Radhakrishna Sureshkumar titled, " Self-Assembly of Nanoparticle−Surfactant Complexes with Rodlike Micelles . (syr.edu)

Depending on the charge of the hydrophilic head, the surfactant is classified as anionic, nonionic, cationic or amphoteric. (ipcol.com)

Moreover, varying parameters like temperature or system composition micelles can also adopt forms other than spherical, such as elongated and worm-like structures. (dataphysics-instruments.com)

This charge helps the surfactant molecules to interact with both the carpet fibers and soil particles, lifting and suspending soils in "bubble-like" arrangements called micelles. (cleanfax.com)
These amines would be ionised throughout the environmentally relevant pH range forming cations, which could be subjected to cationic exchange with soils. (europa.eu)
The micelles work as a unit to remove soils. (ipcol.com)
The negative charge helps the surfactant molecules lift and suspend soils in micelles. (ipcol.com)

ESPT dynamics of HPTS is susceptible to local hydration, and this phenomenon has been utilized to track the reorganization of the mixed micelle at various compositions of copolymer and surfactant molecules. (azpdf.net)
When there are a sufficient amount of surfactant molecules present in a solution they combine together to form structures called micelles. (ipcol.com)

Surfactant concentrations both above and below the critical micelle concentration were used. (chalmers.se)

Plasmid DNA can be covered with lipids in an organized structure like a micelle or a liposome. (genetherapynet.com)
The cationic lipids also protect against degradation of the DNA by the cell. (genetherapynet.com)

Cationic peptides with antimicrobial properties are ubiquitous in nature and have been studied for many years in an attempt to design novel antibiotics. (herts.ac.uk)
Two sets of cationic peptides (AMPs) with known antimicrobial activity have been investigated. (herts.ac.uk)
Ghosh S, Chatterjee S, Satpati P. ( 2023 ) Effect of Spacer Length Modification of the Cationic Side Chain on the Energetics of Antimicrobial Peptide Binding to Membrane-Mimetic Bilayers. (academictree.org)
2023 ) Bridging Thermodynamics, Antimicrobial Activity, and pH Sensitivity of Cationic Membranolytic Heptapeptides-A Computational and Experimental Study. (academictree.org)
Ghosh S, Chatterjee S, Satpati P. ( 2022 ) Effect of a monovalent salt on the energetics of an antimicrobial-peptide: micelle dissociation. (academictree.org)
Ghosh S, Chatterjee S, Satpati P. ( 2022 ) Effect of Leu/Val Mutation on the Energetics of Antimicrobial Peptide:Micelle Binding. (academictree.org)

They also extend this methodology to solutions that contain multiple micelles and nanoparticles for studying emerging morphologies, flow-structure interactions and rheological properties in " Topology, Length Scales and Energetics of Surfactant Micelles " and " Uniaxial Extension of Surfactant Micelles: Counterion Mediated Chain Stiffening and a Mechanism of Rupture by Flow-Induced Energy Redistribution . (syr.edu)

The equilibrium constant, and critical micelle concentration evaluated using the present model are in agreement with the values obtained by using earlier models, suggesting a method of evaluating these parameters from kinetic data only. (ias.ac.in)
What happens when you dilute a surfactant solution at the critical micelle concentration? (stackexchange.com)
The critical micelle concentration CMC is the surfactant concentration at and above which micelles are formed. (dataphysics-instruments.com)
Surface tensiometry was able to show that the critical micelle concentration was greatly affected by the concentration of the PILs. (ens-lyon.fr)
2021 ) Effect of monovalent salt concentration and peptide secondary structure in peptide-micelle binding. (academictree.org)
The peak ascertained near 15GHz, and another peak about 1-2GHz was accorded to free water relaxation and bound water reorientation of the surfactant micelles, and has acquired the reliance of temperature with concentration in detail. (i-scholar.in)

The effect of cationic micelles on the spectroscopic and acid-base properties of QUIN was studied at pH 8. (ac.rs)

The minimization of the unfavorable contact between non-polar surfactant chains and the polar solvent compensates the loss of entropy by micelle formation. (dataphysics-instruments.com)

In contrast to micelles, which, with a few exceptions, require harsh acidic and basic conditions for the self-assembly, bicelles are very effective templates at pH 7. (springer.com)
Contrast variation SANS studies using deuterated version of C12EO6 or SDS, or by varying the D2O/H2O ratio of the suspensions (with CapB), allowed focusing only on the structural properties of OCNFs or surfactant micelles. (lu.se)
The SAXS experiments proved to be difficult for EAN due to contrast issues but scattering from micelles were observed in EtAN solutions. (ens-lyon.fr)

Most polyplexes consist of cationic polymers and their production is regulated by ionic interactions. (genetherapynet.com)
Attractive it-cation interactions may play a role for orienting the dye to the outer region of the micelle. (chalmers.se)

The objective of this work was to study the formation of DNA-cationic vesicle complexes (lipoplexes). (dissertations.se)

This difference in behaviour between HCl and NaCl was shown to result from the greater interaction of the hydronium cation with the micelle surface, thereby enhancing the [P 44414 ]Cl aggregation. (rsc.org)

Molecular recognition: cationic or anionic species. (official-master-chemistry-uab.cat)
Sureshkumar and fellow researchers further used molecular simulations to provide a quantitative description of the shear-induced movement, orientation, stretching and scission of rodlike surfactant micelles in " Dynamics and scission of rodlike cationic surfactant micelles in shear flow . (syr.edu)

With only one exception [ 7 ], all soft-templated periodic mesoporous materials are produced by templation of micelles. (springer.com)
With the exception of folic acid [ 7 ], no other templates but surfactant-containing micelles are known today for the production of periodic mesoporous materials. (springer.com)
Therefore, the pore diameter of micelle-templated mesoporous silicas is fixed as well. (springer.com)
Micelle expanders have been used for the preparation of periodic mesoporous silicas with increased pore sizes [ 8 ]. (springer.com)
As a Post-Doc, he worked at the Institut Charles Gerhardt in Montpellier (France) in 2007 under the supervision of Dr. C. Gérardin and working on the development of mesoporous silica templated by reversible polyion complex micelles. (upmc.fr)

Characterization of sodium sulfopropyl octadecyl maleate micelles by small-angle neutron scattering. (mpg.de)
Cross-section structure of rodlike sodium sulfopropyl octadecyl maleate micelles from small-angle neutron scattering. (mpg.de)

Can micelles form in a polar-vacuum interface? (stackexchange.com)

Based on the present kinetic model for a bimolecular reaction the fraction of substrate and nucleophile bound to the micelle have been calculated. (ias.ac.in)

Structural changes of poly(butadiene)-poly(ethyleneoxide) diblock-copolymer micelles induced by a cationic surfactant: scattering and cryogenic transmission electron microscopy studies. (mpg.de)
The aim of this work is to investigate cationic peptides in order to identify common structural features which could be useful for the design of small peptides or peptido-mimetics with improved drug-like properties and activity against Gram negative bacteria. (herts.ac.uk)

The above results suggest that reaction occurs between the substrate solubilised into the micelle and the nucleophile residing at the Stern layer rather than at the micelle-water interface. (ias.ac.in)
Now if I pour that 100 ml solution into 500 ml of water, will those micelles break up into free surfactant again? (stackexchange.com)
Micelles are tiny ball-like particle that forms in water when an IRO Surfactant is added. (mee.nu)
Micelles are the basic constituents of water-based lotions and emulsions. (mee.nu)
As the micelle forms, the surfactant heads position themselves so they are exposed to water, while the tails are grouped together in the center of the structure protected from water. (ipcol.com)

Certain IRO surfactant are cationic and are used to fight both gram positive and gram negative bacteria. (mee.nu)

As the HPLC method does not take into consideration the effect of cationic exchange, the results can be underestimated. (europa.eu)

In addition to the micelles shown in figure 3 so-called inverse micelles exist which cluster their head groups and orient their chains towards a surrounding non-polar phase. (dataphysics-instruments.com)
Micelles have a head and tail and are able to trap oil inside their bodies. (mee.nu)

Say if instance I have a 100 ml solution with micelles formed using some surfactant. (stackexchange.com)

Then the micelles reform with the tails suspending the soil in the center of the structure. (ipcol.com)

Anatomy1

Chemicals and Drugs55

Analytical, Diagnostic and Therapeutic Techniques and Equipment14

Phenomena and Processes16

Disciplines and Occupations2

Technology, Industry, Agriculture16

Information Science2

Health Care1

Surfactants26

Bromide4

Mixed micelle formation1

Wormlike micelles1

Vesicles5

Negatively charged2

Aqueous3

Rodlike micelles2

Nonionic1

Spherical1

Soils4

Molecules2

Concentrations1

Lipids2

Antimicrobial6

Nanoparticles1

Concentration6

Spectroscopic1

Entropy1

Contrast3

Interactions2

Vesicle1

Surface1

Molecular2

Mesoporous5

Sodium2

Form1

Kinetic1

Structural2

Water5

Gram1

Effect1

Head2

Solution1

Structure1