Presence Of Sodium Dodecyl Benzene Sulphonate Research Articles

High selectivity for sodium dodecyl sulphate by polymer nanoparticles and detection of proteins based on the polymer nanoparticles-sodium dodecyl sulphate system

A fluorescence assay for the sensitive determination of sodium dodecyl sulfate (SDS) based on polymer nanoparticles (PNPs) prepared by polyethyleneimine (PEI) and ascorbic acid (AA) is developed. SDS reacts with PNPs to form amide by aminolysis ester reaction, resulting in a strong fluorescence enhancement of PNPs. Notably, sodium dodecylbenzenesulphonate (SDBS) and sodium dodecyl sulfonate (SDSO) cannot interact with PNPs, so this way exhibits a special selectivity to SDS in the presence of SDBS and SDSO. Under the optimum conditions, this fluorescent nanosensor shows the linear range of SDS from 0.144 to 2.016μgmL−1 and the limit of detection is 0.051μgmL−1. Besides, on the basis of the reaction between SDS and proteins, the fluorescence of PNPs-SDS system quenches in the presence of biologically-relevant levels of myoglobin and thrombin, and displays good sensitivity and selectivity.

Anionic-micelles assisted oxidation of tartaric acid by permanganate: A kinetic and mechanistic approach

Abstract In this study, we demonstrate the catalytic effects of sodium dodecylbenzenesulphonate (SDBS) on the oxidation of tartaric acid by permanganate. UV–visible spectroscopic data revealed that the reaction proceeds through the formation of a transient species between the reactants. The values of ∆ e = 12.8 × 105 mol− 1 dm3 cm− 1 and Kc = 6.5 × 10− 4 mol− 1 dm3 were calculated from the kinetic data. Reaction-time profiles show that the reaction has an induction period (slow step) followed by an auto-acceleration path (fast step). SDBS is found to be stable in presence of MnO4−. The reaction follows first-order kinetics with respect to tartaric acid under pseudo-first-order conditions in absence and presence of SDBS. The observed results are discussed in terms of pseudo-phase model of the micelles proposed by Menger and Portony. The values of activation energy = 99 kJ mol− 1 and 59 kJ mol− 1 were calculated by using Arrhenius equation, respectively, in absence and presence of SDBS micelles. The probable mechanisms have also been proposed and discussed. Presence of silver ions also catalyzed of reaction rates.

A terbium-sensitized spectrofluorimetric method for determination of catecholamines in a serum sample with micelle medium

A terbium-sensitized spectrofluorimetric method has been developed for determination of catecholamines such as norepinephrine (NE), epinephrine (EP) and dopamine (DA), using sodium dodecyl benzene sulphonate (SDBS). Fluorescence sensitization of terbium ions (Tb(3+) ) by complexation with catecholamines in the presence of SDBS was observed. The fluorescence intensities of the Tb(3+) -catecholamine complexes were highly enhanced by introducing SDBS with an emission maximum at 545 nm after excitation at 290 nm. The conditions for the complex formation of Tb(3+) -catecholamine were investigated systematically and optimized to determine catecholamines in a serum sample. Under the optimum conditions, the fluorescence intensities of the Tb(3+) -catecholamine complexes were increased linearly with the concentration of NE, EP and DA over the ranges 2.5 × 10(-10) -1.0 × 10(-8) , 2.5 × 10(-10) -1.0 × 10(-8) and 2.5 × 10(-9) -1.0 × 10(-7) g/mL with correlation coefficients of 0.999, 0.999 and 0.9996, respectively. The limits of detection (3δ) of NE, EP and DA were found to be 4.6 × 10(-11) , 7.8 × 10(-11) and 8.38 × 10(-10) g/mL, respectively. Precision of the method was tested at the concentration level of 1.2 × 10(-7) g/mL for five replicate measurements of NE, EP and DA, giving relative standard deviations (RSDs) of 1.41%, 1.23% and 1.89%, respectively. The interaction mechanism of the Tb(3+) -catecholamine complexes system was investigated and presented with ultraviolet absorption spectra. The proposed method has been applied for the quantitative determination of NE, EP and DA in a spiked serum sample and a pharmaceutical preparation sample.

Resonance light scattering study on the interaction of benproperine phosphate with eriochrome blue black R in the presence of sodium dodecylbenzene sulphonate and its analytical application

The interaction of benproperine phosphate (BPP) with eriochrome blue black R (EBBR) in the presence of sodium dodecylbenzene sulphonate (SDBS) was studied using resonance light scattering (RLS) technology and ultraviolet-visual (UV-vis) spectrophotometry. Under optimum conditions, BPP reacts with EBBP and SDBS to form a three-component complex, which results in strong RLS signal and a new RLS peak. The enhanced RLS intensities are proportional to the concentration of BPP over the range 0.6-28.0 microg/mL, with a detection limit of 0.053 microg/mL. The affecting factors as well as the influence of coexisting substances were investigated. The results indicate that this assay method could be applied to the determination of BPP in pharmaceuticals, serum and urine samples with satisfactory results.

Creaming Rate of Amyl Alcohol‐in‐Water Emulsions

Amyl alcohol/water emulsion forms during dye removal from aqueous phases by solvent (amyl alcohol) extraction using reverse micelles of sodium dodecyl benzene sulphonate (SDBS). The phase separation time of the emulsion dictates the residence of the dye removal processes by reverse micelles. The creaming rate of amyl alcohol/water emulsion formed in the presence of SDBS has been studied and the data are analyzed by theoretical model available in literature.