Cetylpyridinium chloride CPC

This localization phenomenon has also been shown to be important in a case of catalysis by premicellar aggregates. In such a case [ ] premicellar aggregates of cetylpyridinium chloride (CPC) were shown to enhance tire rate of tire Fe(III) catalysed oxidation of sulphanilic acid by potassium periodate in tire presence of 1,10-phenantliroline as activator. This chemistry provides a lowering of tire detection limit for Fe(III) by seven orders of magnitude. It must also be appreciated, however, tliat such premicellar aggregates of CPC actually constitute mixed micelles of CPC and 1,10-phenantliroline tliat are smaller tlian conventional CPC micelles. 

The effect of concentration of cationic (cetylpyridinium chloride, CPC), anionic (sodium dodecylsulfate, SDS) and nonionic (Twin-80) surfactants as well as effect of pH value on the characteristics of TLC separ ation has been investigated. The best separ ation of three components has been achieved with 210 M CPC and LIO M Twin-80 solutions, at pH 7 (phosphate buffer). Individual solution of SDS didn t provide effective separation of caffeine, theophylline, theobromine, the rate of separ ation was low. The separ ation factor and rate of separ ation was increase by adding of modifiers - alcohol 1- propanol (6 % vol.) or 1-butanol (0.1 % vol.) in SDS solution. The optimal concentration of SDS is 210 M. 

Cetylpyridinium chloride (CPC)/ hexane a-Amylase from brewers yeast and invertase from bakers yeast Enzyme activities in cells entrapped in RMs were high compared to free cells [284]... 

Precipitation buffer sodium citrate solution (0.2 M) in demineralized water. The pH is adjusted to pH 4.8 and 1 g/1 cetylpyridinium chloride (CPC) is dissolved in this buffer. 

Solutes. Toluene, although polarizable, was chosen as an apolar solute. Caffeine was chosen as a polar but nonionic solute. Four ionic solutes were tested benzyltrimethylammonium bromide (BTAB) is a cationic quaternary ammonium salt. Benzoic acid acts as an anionic solute at mobile phase pH values between 5.5 and 6.5 (the pK lies between 3.7 in CTAB solutions and 4.7 in SDS solutions)(4). Sodium paraoctylbenzene sulfonate (SOBS) (pK -0.8) and cetylpyridinium chloride (CPC) were chosen as ionic solutes having surfactant properties. Their hydrophobic "tails have the same lenghts as those of SDS and CTAB, respectively. 

Cetylpyridinium chloride (CPC) was used to form ionic bonds with Acrilan (acrylonitrile copolymer) woven fabrics in order to confer antimicrobial functions to the fabrics. The finished fabrics showed good efficacy against Escherichia coli and the washing durability of the antimicrobial properties was excellent. The CPC uptake on the Acrilan fibres depended on the pH during the finishing process, concentration of the CPC and the finishing temperature. High pH and temperatures were... 

FIGURE 6.13 (A) Viability of RAW 264.7 macrophages treated with different SLN formulations compared with cells treated with pure medium (100% viability). Viability is related to the total surfactant concentration in the cell culture medium and was quantified by an MTT assay. All SLN contained 10% Dynasan 114 and 1% of different surfactants (the anionic surfactants sodium cholate [NaCh] or lecithin [S75] or the cationic surfactant cetylpyridinium chloride [CPC]). (B) Viability of RAW 264.7 macrophages treated with different surfactant solutions (the anionic surfactants sodium cholate [NaCh] or lecithin [S75] or the cationic cetylpyridinium chloride [CPC]) compared to cells treated with pure medium (100% viability). Viability is related to the total surfactant concentration in the cell culture medium and was quantified by an MTT assay. 

Cetylpyridinium chloride CPC Hexadecylpyridinium chloride 1-Hexadecylpyridinium chloride n-Hexadecylpyridinium chloride... 

FIGURE 6.9 Emission spectra of 104 in different surfactant solutions (0.5 mg polymer in phosphate-buffered saline (PBS), 10% w/v surfactant, 385 nm, 25°C) PBS, no surfactant cetylpyridinium chloride (CPC) Triton X-100 (160 mM) Tween 20 (81 mM) and Brij 35 (82 mM). The emission spectra were normalized so that the emission maxima intensities of all the samples are identical. (From Lavigne, J.J., et al., Macromolecules, 36, 7409, 2003. With permission.)... 

Aluminum phosphate molecular sieve fibers were obtained by Yates et al. [334] by hydrothermal treatment (180 C/6 h) of a microemulsion system containing (a) toluene, (b) n-butanol,(c) cetylpyridinium chloride, CPC (surfactant) and (d) an aqueous phase made up of aluminum triisopropoxide, phosphoric acid, hydrofluoric acid and triethylamine in water. The treatment yielded long fibers (200-300 nm wide, 15-30 im long), confirmed by X-ray powder diffraction to be AIPO4-5 with preferred orientation. 

Monolith anion- and cation-exchange columns are particularly advantageous for separation of bio ions, although small anions and cations can also be separated. Effective anion columns with high efficiency can be prepared simply by coating a nonionic column with a cationic surfactant, such as cetylpyridinium chloride (CPC) [4]. 

Table 13.1 [30] shows a varying relationship of different solvents with plasmon peak position [31] of Cetylpyridinium chloride (CPC)-stabilized gold NPs. This shows two types of linearity. The of the LSPR of gold NPs in these solvents gradually shifts toward red with the increase in solvent refractive index. This is a linear dependence. But solvents with varying functional groups have a tendency of interaction with surface of Au NPs. Here A shift can be observed with a nonhnear fashion. 

Fluoroalkyl end-capped acrylic acid oligomer [Rp—(ACA) —Rp] can also react with (TEOS) and silica nanoparticles in the presence of low molecular weight aromatic compounds [Ar—H] such as cetylpyridinium chloride (CPC) and bisphe-nol AF under alkaline conditions to afford Rp—(ACA) —Rp/Si02 nanocomposites-encapsulated Ar—H in excellent to moderate isolated yields (see Scheme 4.7) [49],... 

Figure 3.6 shows the thermal stability of organoclay prepared with aminopropylisobutyl polyhedral oligomeric silsesquioxane (POSS) and cetylpyridinium chloride (CPC) [31]. 

Digout et al. [42] have used the above procedure in determining the interfacial composition and distribution coefficient for w/o microemulsion system comprising cetylpyridinium chloride (CPC), alkanols, water, and alkanes. Some results are presented in Table 2.1. 

Gecol et al (2004) investigated the removal of As(V) from water by using flat sheet UF membranes and cetylpyridinium chloride (CPC) as cationic surfactant. In particular, regenerated cellulose (RC) membranes with a MWCO of 10 kDa and polyethersulfone (PES) membranes with MWCO of 5 and 10 kDa were used. When membranes were used without surfactant micelles PES membranes exhibited a lower As removal than RC membranes. This was attributed to the negatively charged surface of RC membranes and, consequently, to a Donnan exclusion mechanism. However, in both cases the As concentration in the permeate stream was higher than the MCL of 10 p.g. The addition of CPC (10 mM) reduced the As concentration in the permeate of all tested membranes well below the MCL. 

In the present study, hydrophobic interaction between hydroxypropylcellulose (HPC) and an ionic surfactant in an aqueous phase was discussed. HPC, as well as EHEC, is a nonionic cellulose ether which contains hydrophobic groups in its molecular structure. Therefore, it might be interesting to compare the complex-formation properties of HPC with that of EHEC. The surfactants used here were an anionic surfactant SDS and a cationic one cetylpyridinium chloride (CPC). HPC formed a complex with these surfactants, of which cloud point changed with the surfactant concentration in the same manner as that observed in the EHEC-surfactant systems [4]. Effects of the complex on stability of dilute and concentrated kaoiinite suspensions were also studied, taking physicochemical properties of the complex into account. 

Fig. 1 Raman microprobe analysis of cetylpyridinium chloride (CPC) Raman spectrum of a microparticle, particle size about 20 pm 30 pm, Ao = 514.5 nm, 6 mW (at sample), beam spot 1 pm diameter, integration time 2 s, number of readings 30...

Fig, 2 Raman microprobe analysis of cetylpyridinium chloride (CPC) in the C—H frequency range. Experimental conditions as in... 

The addition of the cationic surfactant cetylpyridinium chloride (CPC) to aqueous dispersions ofpolyNIPAM-co-AAc microgel particles leads to absorption of the CPC into the microgel particles [35]. Uptake of the surfactant depends on two distinct attractive interactions between the surfactant molecules and the microgel particles ... 

Effects of cationic (cetylpyridinium chloride, CPC) and anionic (SDS) micelles on the rate of reaction of chromium(VI) oxidation of formaldehyde have been studied in the presence and absence of picolinic acid. Cationic micelles (CPC) inhibit whereas anionic micelles (SDS) catalyze the reaction rates that could be attributed to electrostatic interactions between reactants (cationic metal ions and catalyst H+) and ionic head groups of ionic micelles. Experimentally determined kinetic data on these metaUomicellar-mediated reactions have been explained by different kinetic models such as pseudophase ion-exchange (PIE) model, Monger s enzyme-kinetic-type model, and Piszkiewicz s cooperativity model (Chapter 3). The rate of oxidation of proline by vanadium(V) with water acting as nucleophile is catalyzed by aqueous micelles. Effects of anionic micelles (SDS) on the rate of A-bromobenzamide-catalyzed oxidation of ethanol, propanol, and n-butanol in acidic medium reveal the presence of premicellar catalysis that has been rationalized in light of the positive cooperativity model. ... 

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