Sodium dodecyl sulphate , effect

Escribano, J., Cabanes, J., and Garcfa-Carmona, R, Characterisation of latent polyphenol oxidase in table beet effect of sodium dodecyl sulphate, J. Sci. Food Agric., 73, 34, 1997. 

Research has also been conducted in which steryl phosphonic acid (SPA) was examined in place of benzyl arsonic acid (BAA), which was used in an operating plant in China [5], In this study, several collectors were examined, including sodium laurate, sodium dodecyl sulphate, amino acids, diphosphonic acid (SPA). It was discovered that SPA was the most effective and that aliphatic alcohol (i.e. octanol) was required to maintain the effectiveness of SPA. The use of emulsifier in the mixture was required to provide a suitable emulsion of the composite collector. 

An interesting extension of aqueous solution radiolysis involved solutions of sodium dodecyl sulphate in the presence of MNP. Spin adducts of secondary alkyl radicals were detected provided that the critical micelle concentration of the surfactant was exceeded. Whilst it was rather loosely concluded that there is a marked catalytic effect of micelles on the rates of reaction of radicals with nitroso spin traps , no single origin of this effect could be clearly identified (Bakalik and Thomas, 1977). 

This process is a relatively fast one and the diffusion coefficient determined from the correlation time of the fluctuations in the scattering can be too large202) giving too small radii, tm- To avoid this effect, Mazer et al.33) made measurements on sodium dodecyl sulphate in high salt concentration to contract the counterion charge cloud. 

SDS-PAGE, sodium dodecyl sulphate-polyacrylamide gel electrophoresis HPLC, high performance liquid chromatography PCR, polymerase chain reaction IEF, isoelectric focusing HPSEC, high performance size-exclusion chromatography DNA, DNA-binding fluorochrome CPE, cytopathic effect Had, hemadsorption PMA, production of murine antibodies. 

Effect of hexadecane as additive In a series of papers Hallworth and Carless (7,8,9,TO) have investigated the effect of the nature oT the internal phase on the stability of oil in water emulsions as well as the effect of addition of long chain fatty alcohols with sodium dodecyl sulphate or sodium hexadecyl sulphate as the ionic emulsifier. They found that light petroleum and chlorobenzene emulsions prepared only with sodium hexadecyl sulphate were much less stable than those produced using the longer chain paraffins, white spirit and light liquid paraffins. 

The effect of surfactant concentration upon the solubility of cobalt(III) acetylacetonate in buffered aqueous phases at 50 C was also investigated spectroscopically. Saturated solutions were prepared by shaking excess finely-powdered cobalt(III) acetylacetonate with solutions of sodium dodecyl sulphate for approximately one hour at 50 C. It appeared that one hour was sufficient time for the attainment of equilibrium. 

An excess amount of surfactant can solubilize proteins, presumably by additional adsorption to the surface and generation of a large net charge at the surface of the protein molecule. This is the basis for estimation of protein molecular weight by gel electrophoresis in the presence of sodium dodecyl sulphate (SDS-PAGE). Such effects are usually found only at surfactant concentrations well in excess of those normally found in foods, and have more use in laboratory investigations than in ordinary applications. 

Other workers claim a crystal violet and ascorbic acid mixture is similarly very effective in inducing the photopolymerisation of vinyl monomers. The photoinduced emulsion polymerisation of styrene with sodium dodecyl sulphate as a surfactant and dibenzyl ketone as the initiator has been... 

Several examples may be quoted from the literature to illustrate the adsorption of surfactant ions onto soHd surfaces. For a model hydrophobic surface, carbon black has been chosen [22, 23], and Figure 5.5 shows the typical results for the adsorption of sodium dodecyl sulphate (SDS) onto two carbon black surfaces, namely Spheron 6 (untreated) and Graphon (graphitised), which also describes the effect of surface treatment. 

Most reports on emulsion polymerisation have been limited to commercially available surfactants which, in many cases, are relatively simple molecules such as sodium dodecyl sulphate and simple nonionic surfactants. However, studies on the effects of surfactant structure on latex formation have revealed the importance of the structure of the molecule. Block and graft copolymers (polymeric surfactants) are expected to be better stabilisers when compared to simple surfactants. The use of these polymeric surfactants in emulsion polymerisation and the stabilisation of the resulting polymer particles is discussed below. 

Batina, N., and B. Cosovic (1987), Adsorption of a Mixture of Sodium Dodecyl Sulphate and Dodecyl Alcohol on a Mercury Electrode and Its Effect on the Electrochemical Processes of Cadmium(TI) in Sodium Chloride Solution, J. Electroanal. Chem, 227, 129-146. 

Batina, N., B. Cosovic, and N. Filipovic-Vincekovic (1988), The Effect of Trace Amounts of Dodecyl Alcohol on the Physicochemical Properties of Sodium Dodecyl Sulphate Electrochemical Study at the Mercury/Sodium Chloride Interface, J. Colloid. Interface Set. 125, 69-79. 

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