scholarly journals Rheological characterisation of chitosan/sodium lauryl ether sulfate complexes

2019 ◽  
pp. 152-162
Author(s):  
Jelena Milinkovic-Budincic ◽  
Lidija Petrovic ◽  
Jadranka Fraj ◽  
Sandra Bucko ◽  
Jaroslav Katona ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Chemical Properties ◽  
Cationic Polyelectrolyte ◽  
Rheological Parameters ◽  
Mass Ratio ◽  
Sodium Lauryl Ether Sulfate ◽  
Ether Sulfate ◽  
Lauryl Ether ◽  
Pharmaceutical Industries ◽  
Physical And Chemical

Chitosan is a cationic biopolymer, which attracts more and more attention in recent years, due to its exceptional physical and chemical properties, expressive biocompatibility and possibilities of obtaining from renewable sources. Formed polymer/surfactant complexes affect changes in the rheological properties and the final result is the formation of coacervates. The purpose of this study was to investigate the rheological properties of aqueous solutions of cationic polyelectrolyte, chitosan and sodium lauryl ether sulfate (SLES), an anionic surfactant, widely used in the cosmetics industry. Using the Thermo Haake RS600 rheometer, changes in the rheological and elastic properties of chitosan and SLES mixtures have been identified, gained as a result of the interaction of the components. In all examined samples coefficient of thixotropy was increasing with increase SLES concentration and achieves a maximum value at the mass ratio chitosan:SLES 1:2, after which it reduces. The oscillatory measurements in mixtures, performed by amplitude sweep method at low oscillating frequency 1 Hz, show that the linear viscoelastic region increases with increasing SLES concentration up to the same chitosan:SLES mass ratio. By monitoring the changes in the rheological parameters of the mixtures over five days, it was observed that the viscosity, the coefficient of thixotropy and elasticity were increasing, indicating that changes in the system occur over a longer period of time. In that manner, obtained results indicate the possibility of using rheological methods for a more detailed description of the interaction in the chitosan/SLES mixtures, important for their application in cosmetics and pharmaceutical industries.

Physicochemical studies and rheological modelling of Albizia lebbeck (AL) gum exudates

2014 ◽  
Vol 43 (4) ◽  
pp. 228-244 ◽  
Author(s):  
Nnabuk Okon Eddy ◽  
Inemesit Udofia ◽  
Adamu Uzairu
Keyword(s):  
Chemical Properties ◽  
Physicochemical Analysis ◽  
Rheological Parameters ◽  
Capillary Viscometer ◽  
Albizia Lebbeck ◽  
Content Type ◽  
Molecular Arrangement ◽  
Pharmaceutical Industries ◽  
Physical And Chemical ◽  
Scanning Electron

Purpose – The purpose of this study is to determine the physicochemical and rheological parameters of Albizia lebbeck gum. Design/methodology/approach – Physicochemical analysis was carried out using recommended methods. Gas chromatography mass spectrophotometer and Fourier transformed infra red (FTIR) analyses were carried out using their respective spectrophotometer. Scanning electron microscopy was carried out using scanning electron microscope, while rheological measurements were carried out using Ubbelohde capillary viscometer, digital Brookfield DV 1 viscometer and a rheometer. Findings – Albizia zygia gum is an ionic gum with unique physical and chemical properties. Scanning electron micrograph revealed that the internal structure of the gum is porous with irregular molecular arrangement. Thermodynamic parameters of viscous flow indicated the existence of few inter- and intra-molecular interactions, and the attainment of transition state was linked to bond breaking. Coil overlap transition studies revealed the existence of dilute and concentrated regimes. The viscosity of the gum was also found to decrease with decrease in the charge of cation (such that Al3+ > Ca2+ > K+) and with increase in ionic strength. Research limitations/implications – The paper provided information on physicochemical and rheological characteristics/behaviour of Albizia zygia gum, of Nigerian origin. From this information, possible application of this gum in the food and pharmaceutical industries can be deduced. Originality/value – The paper is original since information concerning Albizia zygia gum of Nigerian origin are not well documented as established in the work. It also adds values on the use of Albizia zygia gum, either on its own or in combination with other gums for industrial purpose.

Chitosan-based Magnetic Composites - Efficient Adsorbents for Removal of Pb(II) and Cu(II) from Aqueous Mono and Bicomponent Solutions

2018 ◽  
Vol 69 (9) ◽  
pp. 2323-2330 ◽  
Author(s):  
Daniela C. Culita ◽  
Claudia Maria Simonescu ◽  
Rodica Elena Patescu ◽  
Nicolae Stanica
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Chemical Properties ◽  
Order Kinetic ◽  
Mass Ratio ◽  
Magnetic Adsorbent ◽  
Magnetic Composites ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Physical And Chemical

A series of three chitosan-based magnetic composites was prepared through a simple coprecipitation method. It was investigated the influence of mass ratio between chitosan and magnetite on the physical and chemical properties of the composites in order to establish the optimum conditions for obtaining a composite with good adsorption capacity for Pb(II) and Cu(II) from mono and bicomponent aqueous solutions. It was found that the microspheres prepared using mass ratio chitosan / magnetite 1.25/1, having a saturation magnetization of 15 emu g--1, are the best to be used as adsorbent for the metal ions. The influence of different parameters such as initial pH values, contact time, initial concentration of metal ions, on the adsorption of Pb(II) and Cu(II) onto the chitosan-based magnetic adsorbent was investigated in details. The adsorption process fits the pseudo-second-order kinetic model in both mono and bicomponent systems, and the maximum adsorption capacities calculated on the basis of the Langmuir model were 79.4 mg g--1 for Pb(II) and 48.5 mg g--1 for Cu(II) in monocomponent systems, while in bicomponent systems were 88.3 and 49.5 mg g--1, respectively. The results revealed that the as prepared chitosan-based magnetic adsorbent can be an effective and promising adsorbent for Pb(II) and Cu(II) from mono and bicomponent aqueous solutions.

scholarly journals Partitioning of Selected Anisole and Veratrole Derivatives between Water and Anionic Surfactant Micelles

Molecules ◽  
2020 ◽  
Vol 25 (24) ◽  
pp. 5818
Author(s):  
Andrzej Lewandowski ◽  
Katarzyna Szymczyk
Keyword(s):  
Molecular Structures ◽  
Head Group ◽  
Lauryl Sulfate ◽  
Micellar Solubilization ◽  
Surfactant Micelles ◽  
Sodium Lauryl Ether Sulfate ◽  
Ether Sulfate ◽  
Water Partition Coefficient ◽  
Lauryl Ether ◽  
Derivatives Of

The UV absorption spectra of six structurally related derivatives of anisole and veratrole, i.e., anisaldehyde, (E)-anethole, estragole, veratraldehyde, methyleugenol and (E)-methylisoeugenol, were recorded at various concentrations of the anionic surfactants, either sodium lauryl sulfate (SLS) or sodium lauryl ether sulfate (SLES) at T = 298 K. In addition, conductivity and density measurements were made for the SLS and SLES solutions to determine the volumetric properties of the studied surfactants. Next, using the W. Al-Soufi, L. Pińeiro and M. Novo model (APN model) including the pseudo-phase model for micellar solubilization, the values of micelle-water partition coefficients for each perfume-surfactant system were determined. In addition, the relations between the molecular structures of the solute and the head group of the surfactant and the value of the micelle-water partition coefficient as well as the octanol-water one were discussed.

Environmental and energetic effects of cleaner production scenarios on the Sodium Lauryl Ether Sulfate production chain

2019 ◽  
Vol 240 ◽  
pp. 118203
Author(s):  
Alex R. Nogueira ◽  
Maria da Graça C.B. Popi ◽  
Claudia Cristina Sanchez Moore ◽  
Luiz Kulay
Keyword(s):  
Cleaner Production ◽  
Production Chain ◽  
Sulfate Production ◽  
Sodium Lauryl Ether Sulfate ◽  
Ether Sulfate ◽  
Lauryl Ether

scholarly journals Near infrared absorption spectroscopy for the quantification of unsulfated alcohol in sodium lauryl ether sulfate

2020 ◽  
pp. 096703352096382
Author(s):  
SE Cunliffe ◽  
PA Martin ◽  
MR Baker ◽  
O Mihailova ◽  
PJ Martin
Keyword(s):  
Gas Chromatography ◽  
Least Squares ◽  
Partial Least Squares ◽  
Absorption Spectroscopy ◽  
Near Infrared ◽  
External Validation ◽  
Sodium Lauryl Ether Sulfate ◽  
Ether Sulfate ◽  
Lauryl Ether ◽  
Nir Absorption

Compositional variations in the surfactants used to produce personal care products result in significant challenges during large scale manufacturing, for example errors in product viscosity. Characterisation of the surfactant can be completed using chromatographic techniques however these are time consuming and impractical during real-time manufacturing. Near infrared (NIR) absorption spectroscopy with a fibre-optic coupled transmission probe is proposed as an in-line method of determining the levels of unsulfated alcohol in sodium lauryl ether sulfate (SLES). NIR absorption spectra in the region of 4000 – 12000 cm−1 were collected for a range of supplier samples at three temperatures. Gas chromatography - mass spectrometry was used as a reference technique to quantify samples of SLES and quantitative chemometric data analysis was used to produce partial least squares (PLS) calibration models for the prediction of surfactant composition. PLS regression was performed on the data in the spectral regions between 7509 – 5334 cm−1 using a range of data pre-processing techniques to identify the best model. Models were evaluated using root mean square error of cross validation (RMSECV) and residual predictive deviation (RPD) as the primary indicator of model accuracy and robustness. A partial least squares regression model using a generalised least squares weighting data pre-processing approach was found to be the most robust in regards to sample non-homogeneity and temperature, producing a model with an RMSECV = 0.094 w/w% and RPD = 4.03. The model successfully predicted the unsulfated alcohol mass percentage in an external validation of unknown samples with alcohol levels within the model limits of 0.7–2.2 w/w%. Spectra acquired at a resolution of 8 cm−1 with 32 scans take just 16 seconds to obtain, proving that NIR spectroscopy can successfully be applied as an alternative analytical method to gas chromatography for the determination of low level impurities in viscous surfactant systems.

scholarly journals Sodium lauryl ether sulfate (SLES) degradation by nitrate-reducing bacteria

2017 ◽  
Vol 101 (12) ◽  
pp. 5163-5173 ◽  
Author(s):  
Ana M. S. Paulo ◽  
Rozelin Aydin ◽  
Mauricio R. Dimitrov ◽  
Harm Vreeling ◽  
Ana J. Cavaleiro ◽  
...  
Keyword(s):  
Sodium Lauryl Ether Sulfate ◽  
Ether Sulfate ◽  
Lauryl Ether ◽  
Reducing Bacteria ◽  
Nitrate Reducing Bacteria
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