Cetyl-trimethylammonium bromide

A kinetic study of the thermal degradation of cetyl-trimethylammonium bromide inside the mesoporous SBA-3 molecular sieve... 

Ci2H25S0itNa (NaDDS) from B.D.H. or Serva (Germany) Na-deoxy-cholate (NaDOC) from Sigma Cetyl trimethylammonium bromide (CTAB) from Schuchardt, were used as supplied by the respective manufacturer (over 99 % purity). Distilled water was used after treatment with the Millipore Q filter. 

Acid detergent fibre (ADF) Cetyl trimethylammonium bromide in 0.5 M H.SO, Boil for 1 h Lignocellulose + insoluble mineral... 

Acid detergent solution - add 100 g cetyl trimethylammonium bromide (CTAB), also called hexadecyltrimethylammonium bromide, technical grade, to 2.5 I of 1 M sulphuric acid, stir to dissolve and make up to 5 I... 

Figure 3. X-ray long spacings (A) of systems of cetyl-trimethylammonium bromide and water as a function of the ratio gram water/gram association colloid (8)...

Gutsche et al. observed that a lipophilic dioxime (the ligand in 4) accelerates by a factor of 60 to 140 the hydrolysis of acetyl phosphate in the presence of an equimolar amount of metal (M = Cu, Zn, Ni) under comicellar conditions with cetyl trimethylammonium bromide (CTAB) at pH 11.5 [22], The hydrolysis reaction was followed by pseudo-first-order kinetics at [ligand] = [M] = 2.5 mM and [CTAB] = 250 mM. Although a possible complex 4 was proposed to exist in the hydroxamate form, there were no experimental data for the stability and structure of metal complexes at pH 11.5 (e.g., it is not known whether the... 

An ionic surface-active agent in which the surface active moiety is the cation, e.g., cetyl trimethylammonium bromide (CTAB) C16H33N(CH3)3+Br-. 

P CAM 176, is a complexation with pyrocatecho1-violet sensitized by cetyl trimethylammonium bromide for detection at 662 nm. Two ASS methods for inorganic tin are P CAM 173 and S-183. The former does not provide complete oxidation of inorganic tin and should not be used. S-183 is both specific in its directions and inherent limitations. Nitric acid sulfuric acid (5 1) wet ashing will oxidize all organo and inorganic tin except the oxide to tin (IV). Although P CAM 173 recommends nitrous oxide-acetylene atomization with the 286.3 nm line,... 

Several organic solvents were investigated with regard to stability and activity of HLADH as well as their influence on the hydrogenase-driven reaction. Hydrophobic solvents such as heptane or toluene proved to be the most suitable solvents for the coupled enzyme-system. Furthermore, it became apparent that nonimmobilized cells, permeabilized with cetyl-trimethylammonium bromide, showed the best results for NADH regeneration. After optimization the conversion in heptane with 10% water yields 99% cyclohexanol by reduction of cyclohexanone. 

Cationic 1-Hexadecyl (=Cetyl)-trimethylammonium bromide (CTAB) CH3-(CH2)i5-N(CH3)3Br 0.0013 78... 

According to Eq. (5-158), the reaction of l-fluoro-2,4-dinitrobenzene with pheno-late or thiophenolate ions is accelerated by micelles of cetyl-trimethylammonium bromide (CTABr) in aqueous solution by factors of 230 and 1100, respectively [404]. 

Most chemical studies in this field have eoncentrated on the effect of micellar surfactants on reaction rates and only a few attempts have been made to investigate the effect that micelles might have in altering the relative extent of competing reactions. For example, in studying the competitive hydrolysis and aminolysis of aryl sulfates in aqueous solution, Fendler et al. have found [407] that cationic micelles such as cetyl-trimethylammonium bromide (CTABr) are able to alter the balance between S—O bond fission and C—O bond fission as shown in Eq. (5-162). 

Fig. 1.4. (A) Separation of Ihe individual oligomers in a Serdox NNP 4 sample of clhoxylalcd nonylphenol non-ionie surfactants on a Scpan>n SGX Amine. 7 pm, column tl5() x. . .4 mm i.d.) with acclonitrilc-water-dichloromethane 49 I 50 mobile phase at 0.5 ml/min. lifeiection UV. 230 nm. (B) Separation of the individual non-sulphatcd (first group of peaks) and sulphalcd anionic (second group) oligomers in a partially sulphated Serdox NNP 4 sample of clhoxylalcd nonylphenol on a Separon SGX Amine. 7 pm, column (150 X 3.3 mm i.d.) with Ihe mobile phase containing 0.04 M cetyl trimethylammonium bromide (CTAB) in acetonitrile-water-dichloromeihane f>8.6 1.4 . 3() at 0.5 ml/min. Detection UV. 2.30 nm.

Cationic Lauiylamine hydrochloride Cetyl trimethylammonium bromide CH3(CH2)iiNH3"cr CH3(CH2)i5N"(CH3)3Br-... 

Synonyms cetrimide BP 1953 cetrimonium bromide cetyl-trimethylammonium bromide CTAB N,N,N-trimethyl-hexadecylammonium bromide. 

For most electrophoretic separations of small ions, the smallest analysis time results when the analyte ions move in the same direction as the electroosmotic flow. Thus, for cation separations, the walls of the capillary are untreated, and the electroosmotic flow and the cation movement are toward the cathode. For the separation of anions, however, the electroosmotic flow is usually reversed by treating the walls of the capillary with an alkyl ammonium salt, such as cetyl trimethylammonium bromide. The positively charged ammonium ions become attached to the negatively charged silica surface and in turn create a negatively charged double layer of solution, which is attracted toward the anode, reversing the electroosmotic flow. 

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