Preconcentration and determination of β-carotene nanoparticles in fruit and juice samples based on a micelle mediated system

RSC Advances ◽  
2015 ◽  
Vol 5 (104) ◽  
pp. 85494-85499 ◽  
Author(s):  
Nahid Pourreza ◽  
Tina Naghdi
Keyword(s):  
Cloud Point ◽  
Cloud Point Extraction ◽  
Ionic Surfactant ◽  
System P ◽  
Surfactant Phase ◽  
Β Carotene

The method is based on the enrichment of β-carotene nanoparticles in a non-ionic surfactant phase using cloud point extraction.

scholarly journals Cloud Point Extraction and Determination of Silver Ion in Real Sample using Bis((1H-benzo[d]imidazol-2yl)methyl)sulfane

2011 ◽  
Vol 8 (1) ◽  
pp. 435-442 ◽  
Author(s):  
Farshid Ahmadi ◽  
Khodabakhsh Niknam ◽  
Ebrahim Niknam ◽  
Saeid Delavari ◽  
Azadeh Khanmohammadi
Keyword(s):  
Cloud Point ◽  
High Efficiency ◽  
Cloud Point Extraction ◽  
Chelating Agent ◽  
Bath Temperature ◽  
Silver Ion ◽  
Complexing Agent ◽  
Ionic Surfactant ◽  
Ultra Trace

Bis((1H-benzo[d]imidazol-2yl)methyl)sulfane (BHIS) was used as a complexing agent in cloud point extraction for the first time and applied for selective pre-concentration of trace amounts of silver. The method is based on the extraction of silver at pH 8.0 by using non-ionic surfactant T-X114 and bis((1H-benzo[d]imidazol-2yl)methyl)sulfane as a chelating agent. The adopted concentrations for BHIS, Triton X-114 and HNO3, bath temperature, centrifuge rate and time were optimized. Detection limits (3SDb/m) of 1.7 along with enrichment factor of 39 for silver ion was achieved. The high efficiency of cloud point extraction to carry out the determination of analytes in complex matrices was demonstrated. The proposed method was successfully applied to the ultra-trace determination of silver in real samples.

Ultrasound-assisted cloud point extraction coupled with flame atomic absorption spectrometry for the determination of lead and cadmium in water samples

2014 ◽  
Vol 6 (10) ◽  
pp. 3241-3246 ◽  
Author(s):  
Zonghao Li ◽  
Jiaxi Chen ◽  
Mousheng Liu ◽  
Yaling Yang
Keyword(s):  
Cloud Point ◽  
Water Samples ◽  
Cloud Point Extraction ◽  
Absorption Spectrometry ◽  
Ionic Surfactant ◽  
Lead And Cadmium ◽  
Flame Atomic Absorption ◽  
Alkylphenol Ethoxylate ◽  
Ultrasound Assisted

A new method based on ultrasound-assisted cloud point extraction (UA-CPE) using the mixture of non-ionic surfactant alkylphenol ethoxylate NP-7 and alkylphenol ethoxylate NP-9 for the preconcentration of trace amounts of lead (Pb) and cadmium (Cd) in water samples prior to determination by FAAS has been developed.

scholarly journals Formulation of chelating agent with surfactant in cloud point extraction of methylphenol in water

2018 ◽  
Vol 5 (7) ◽  
pp. 180070 ◽  
Author(s):  
H. Z. Hazrina ◽  
M. S. Noorashikin ◽  
S. Y. Beh ◽  
S. H. Loh ◽  
N. N. M. Zain
Keyword(s):  
Cloud Point ◽  
High Performance ◽  
Cloud Point Extraction ◽  
Chelating Agent ◽  
Reversed Phase ◽  
Ionic Surfactant ◽  
Relative Standard ◽  
Separation And Preconcentration ◽  
Interference Study

Cloud point extraction (CPE) is a separation and preconcentration of non-ionic surfactant from one liquid phase to another. In this study, Sylgard 309 and three different types of additives for CPE, namely CPE-Sylgard, CPE-Sylgard-BMIMBr and CPE-Sylgard-GLDA, are investigated to extract methylphenol from water samples. The methylphenols are well separated by reversed-phase high-performance liquid chromatography (HPLC) with isocratic elution of acetonitrile : water; 60 : 40 (v/v) and detection at 260 nm. The optimized parameters for the effect of salt, surfactant, temperature, time of extraction, pH, interference study and the performance of different additives on methylphenol extraction are investigated. CPE-Sylgard-GLDA is chosen because it gives us a high peak and good peak area compared with CPE-Sylgard and CPE-Sylgard-BMIMBr. The recovery extractions of CPE-Sylgard-GLDA are obtained in the range of 80–99% as the percentage of relative standard deviation (RSD) is less than 10. The LOD and LOQ are 0.05 ppm and 0.18 ppm, respectively. The method developed for CPE-Sylgard-GLDA coupled with HPLC is feasible for the determination of methylphenol because it is simple, effective, cheap, and produces a high percentage of recovery.

scholarly journals Cloud Point Extraction for Pre-Concentration and Spectrophotometric Determination of Trace Amounts of Silver Ions

2020 ◽  
Vol 10 (03) ◽  
pp. 459-464
Author(s):  
Azhar A. Ghali
Keyword(s):  
Detection Limit ◽  
Cloud Point ◽  
Spectrophotometric Determination ◽  
Cloud Point Extraction ◽  
Incubation Temperature ◽  
Chelating Agent ◽  
Silver Ions ◽  
Ionic Surfactant ◽  
Triton X

During the last years, the cloud point extraction was applied for determination, separation, and enrichment of the elements. The current study used cloud point extraction (CPE) for the extraction of Ag(I) ions pre-concentration from watery solutions by a non-ionic surfactant (Triton X-114) and chelating agent a 6-(4-bromo-phenylazo)m-anisidine[6-(4-BrPAA)], then estimation by using the spectrophotometry at 514 nm. Several condition effects on the efficiency of the cloud-point extraction included Triton X-114 concentration, [6-(4-BrPAA)] concentration, pH, time, and incubation temperature. The silver reacts with [6-(4-BrPAA)] to produce complex at a ratio of one to one. 0.009 to 1.5 μg mL-1 is the range of linearity. The detection limit and quantification of Ag(I) ion were 0.0054 and 0.0182 μg mL-1, respectively. The interference of the cations was examined. The cloud-point extraction was used for the evaluation of silver concentration in the water specimen.

Selective Ligandless Cloud Point Extraction of Palladium from Water and Dust Samples

2015 ◽  
Vol 98 (1) ◽  
pp. 201-205 ◽  
Author(s):  
Sayed Zia Mohammadi ◽  
Mohsen Mohammadnezhad
Keyword(s):  
Cloud Point ◽  
High Efficiency ◽  
Cloud Point Extraction ◽  
Absorption Spectrometry ◽  
Ionic Surfactant ◽  
Solution Ph ◽  
Flame Atomic Absorption ◽  
Separation And Preconcentration ◽  
Triton X

Abstract In this study, the phase-separation phenomenon ofnon-ionic surfactants was used for separation and preconcentration of Pd(II). The cloud point extraction(CPE) method is based on the formation of PdI2 which is then entrapped in the non-ionic surfactant Triton X-114. Ethanol acidified with 0.5 M HNO3 was added to the surfactant-rich phase prior to its analysis by flame atomic absorption spectrometry. The main factors affecting CPE efficiency, such as sample solution pH, concentration of iodide ion and Triton X-114, equilibration temperature and time, were all investigated and optimized. At optimum conditions, a calibration curve was constructed for the determination of palladium according to the ligandless CPE procedure. Linearity was maintained between 1.0 to 500.0 ng/mL. The LOD based on three times the SD of the blank divided by the slope of analytical curve, (3Sb/m) was 0.3 ng/mL. Seven replicatedeterminations of a solution containing of 4.0 μg palladium gave a mean absorbance of 0.359 with RSD ±1.85%. The high efficiency of CPE to carry out the determination of palladium in complex matrixes was demonstrated. The proposed method has beenapplied to the determination of trace amounts of palladium in a platinum-iridium alloy, water, and dust samples, with satisfactory results.

scholarly journals Cloud-Point Extraction Combined with Liquid Chromatography for the Determination of Ergosterol, a Natural Product with Diuretic Activity, in Rat Plasma, Urine, and Faeces

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Dan-Qian Chen ◽  
Jun-Min An ◽  
Ya-Long Feng ◽  
Ting Tian ◽  
Xiang-Yang Qin ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Cloud Point ◽  
Cloud Point Extraction ◽  
Rat Plasma ◽  
Ionic Surfactant ◽  
Pharmacokinetic Studies ◽  
Triton X

Ergosterol from many medicinal fungi has been demonstrated to possess a variety of pharmacological activitiesin vivoandin vitro. A new method based on cloud-point extraction has been developed, optimized and validated for the determination of ergosterol in rat plasma, urine and faeces by liquid chromatography. The non-ionic surfactant Triton X-114 was chosen as the extract solvent. The chromatographic separation was performed on an Inertsil ODS-3 analytical column with a mobile phase consisting of methanol and water (98 : 2, v/v) at a flow rate of 1 mL/min. The methodology was validated completely. The results indicated good performance in terms of specificity, linearity, detection and quantification limits, precision and accuracy. The method was successfully applied to the pharmacokinetic studies of ergosterol in rats. The results indicate that the ergosterol levels in feces are much higher than those in plasma and urine of the rat.

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