Ion-pair cloud-point extraction: A new method for the determination of water-soluble vitamins in plasma and urine

2014 ◽  
Vol 37 (19) ◽  
pp. 2724-2731 ◽  
Author(s):  
Rouhollah Heydari ◽  
Najmeh S. Elyasi
Keyword(s):  
Cloud Point ◽  
Cloud Point Extraction ◽  
Ion Pair ◽  
Water Soluble ◽  
New Method

LC/MS Method Using Cloud Point Extraction for the Determination of Permitted and Illegal Food Colors in Liquid, Semiliquid, and Solid Food Matrixes: Single-Laboratory Validation

2011 ◽  
Vol 94 (6) ◽  
pp. 1853-1862 ◽  
Author(s):  
Ebru Ates ◽  
Klaus Mittendorf ◽  
Hamide Senyuva
Keyword(s):  
Cloud Point ◽  
Cloud Point Extraction ◽  
Water Soluble ◽  
Sunset Yellow ◽  
Allura Red ◽  
The Mean ◽  
Triton X ◽  
Single Laboratory ◽  
Food Colors

Abstract A cloud point extraction method is reported using LC/MS for the determination of regulated water-soluble food colors (Allura Red, Sunset Yellow, erythrosine, and tartrazine) and banned fat-soluble synthetic azo dyes (Sudan I, II, III, and IV; Red B; 7B; Black B; Red G; Metanil Yellow; and Rhodamine B). The extraction of all 14 colors was carried out with cloud point extraction using the nonionic surfactant Triton X 114. Optimized conditions for cloud point extraction were 3% Triton X 114 (w/v), 0.1 M ammonium acetate, and heating at 50°C for 30 min. This approach proved effective in giving quantitative recoveries from a diverse range of food matrixes, and optimized LC gave baseline chromatographic separation for all colors including Sudan IV and Red B. Single-laboratory validation was performed with spiking into liquid matrixes (wine and homemade wine), semiliquid matrixes (sauce and homemade paprika paste), and solid matrixes (spice and homemade chili powder) using the respective blank matrixes for matrix-matched calibration. The LOQ values for water-soluble colors were in the range of 15–150 mg/kg, and for the fat-soluble colors, 0.1–1.5 mg/kg. The mean recovery values were in the range of 69.6–116.0% (except Allura Red and Sunset Yellow in wine, for which recoveries were lower). The mean RSDs for colors were in the range of 4.0–14.8%. A small survey was conducted of samples of confectionery products, dried fruits, wines, bitter sodas, juices, sauces, pastes, and spices, which demonstrated the applicability of the method to a diverse selection of real food samples. Allura Red was detected in strawberry jelly and Sunset Yellow in artificial saffron.

scholarly journals Cloud point extraction for separation, preconcentration and determination zinc (ii) in different pharmaceutical samples

2019 ◽  
Vol 10 (4) ◽  
pp. 3006-3012
Author(s):  
Ghusoon Jawad Shabaa
Keyword(s):  
Solvent Extraction ◽  
Cloud Point ◽  
Cloud Point Extraction ◽  
Extraction Methods ◽  
Ion Pair ◽  
Optimum Conditions ◽  
Pharmaceutical Samples ◽  
Association Complex ◽  
Methyl Phenyl

Joining solvent extraction with cloud point extraction methods obtained a susceptible method for separation, pre-concentration, extraction and categorization of  Zn (II), after forming an ion-pair association complex between Zn+2 and 4-(3-methyl phenyl azo)-4,5- diphenyl imidazole (MPADPI) with wavelength for maximum absorbance λmax.=496 Nm. This study shows optimum conditions for the formation and exaction ion-pair association complex under pH=9 and 0.5 mL Tritonx-100, 1×10-4 M (MPADPI) and heating at 80 Co for 20 minutes so that this study involved the effect of electrolyte and interferences along with the spectrophotometric determination of Zinc (II) in diverse samples.

scholarly journals Extraction and Determination of Nickel (Ii) Via Cloud Point Method

2018 ◽  
Vol 7 (4.36) ◽  
pp. 725
Author(s):  
Fatimah A.Wannas ◽  
Shawket K.Jawad
Keyword(s):  
Cloud Point ◽  
Cloud Point Extraction ◽  
Wave Length ◽  
Spectrophotometric Study ◽  
Effect Study ◽  
Heating Time ◽  
Ion Pair ◽  
Determination Of Nickel ◽  
Triton X

Spectrophotometric  study for ion pair complex of Ni(II) ion extracted into cloud point extraction larger appear wave length of maximum absorbance was λ=660 nm, for extracted Ni(II) ion as ion pair association ,used laboratory synthesized azo derivative 2-(4-hydroxy phenyl azo)-4-Benzen naphthol(HPAB).The study about Determination the optimum condition for extraction and  determination was pH  =10 in presence 100 µg Ni(II) in 10 ml aqueous solution ,0.6 mL of Triton x-114 and temperature of heating was 70 c° at heating time equal to 30 minute, stoichiometry shows the ion pair complex extracted was 1:1 (Ni-HPAB) +2;2Cl_, in addition to electrolyte effect study as well as spectrophotometric determination of Ni(II) in different samples .  

scholarly journals Facile Cloud Point Extraction for the Separation and Determination of Phenolic Acids from Dandelion

ACS Omega ◽  
2021 ◽  
Author(s):  
Yongsheng Ji ◽  
Le Wu ◽  
Ruihong Lv ◽  
Haohao Wang ◽  
Shuhui Song ◽  
...  
Keyword(s):  
Cloud Point ◽  
Phenolic Acids ◽  
Cloud Point Extraction
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