scholarly journals Solid-Phase Extraction and Large-Volume Sample Stacking-Capillary Electrophoresis for Determination of Tetracycline Residues in Milk

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Gabriela Islas ◽  
Jose A. Rodriguez ◽  
Irma Perez-Silva ◽  
Jose M. Miranda ◽  
Israel S. Ibarra
Keyword(s):  
Capillary Electrophoresis ◽  
Solid Phase Extraction ◽  
Large Volume ◽  
Solid Phase ◽  
Phase Extraction ◽  
Sample Stacking ◽  
Milk Samples ◽  
Relative Standard ◽  
Tetracycline Residues ◽  
Large Volume Sample Stacking

Solid-phase extraction in combination with large-volume sample stacking-capillary electrophoresis (SPE-LVSS-CE) was applied to measure chlortetracycline, doxycycline, oxytetracycline, and tetracycline in milk samples. Under optimal conditions, the proposed method had a linear range of 29 to 200 µg·L−1, with limits of detection ranging from 18.6 to 23.8 µg·L−1 with inter- and intraday repeatabilities < 10% (as a relative standard deviation) in all cases. The enrichment factors obtained were from 50.33 to 70.85 for all the TCs compared with a conventional capillary zone electrophoresis (CZE). This method is adequate to analyze tetracyclines below the most restrictive established maximum residue limits. The proposed method was employed in the analysis of 15 milk samples from different brands. Two of the tested samples were positive for the presence of oxytetracycline with concentrations of 95 and 126 µg·L−1. SPE-LVSS-CE is a robust, easy, and efficient strategy for online preconcentration of tetracycline residues in complex matrices.

Solid-Phase Extraction and Large-Volume Sample Stacking-Capillary Electrophoresis for Determination of Artificial Sweeteners in Water Samples

2018 ◽  
Vol 12 (2) ◽  
pp. 526-533 ◽  
Author(s):  
Lorena Camargo Medrano ◽  
Juan Francisco Flores-Aguilar ◽  
Gabriela Islas ◽  
José Antonio Rodríguez ◽  
Israel Samuel Ibarra
Keyword(s):  
Capillary Electrophoresis ◽  
Solid Phase Extraction ◽  
Large Volume ◽  
Water Samples ◽  
Solid Phase ◽  
Artificial Sweeteners ◽  
Phase Extraction ◽  
Sample Stacking ◽  
Large Volume Sample Stacking

Use of large-volume sample stacking in on-line solid-phase extraction-capillary electrophoresis for improved sensitivity

2008 ◽  
Vol 29 (6) ◽  
pp. 1339-1346 ◽  
Author(s):  
Patricia Puig ◽  
F. W. Alexander Tempels ◽  
Govert W. Somsen ◽  
Gerhardus J. de Jong ◽  
Francesc Borrull ◽  
...  
Keyword(s):  
Capillary Electrophoresis ◽  
Solid Phase Extraction ◽  
Large Volume ◽  
Solid Phase ◽  
Phase Extraction ◽  
Sample Stacking ◽  
On Line ◽  
Large Volume Sample Stacking

scholarly journals Dispersive solid-phase extraction based on butylamide silica for the determination of sulfamethoxazole in milk samples by capillary electrophoresis

2016 ◽  
Vol 39 (14) ◽  
pp. 658-665 ◽  
Author(s):  
Gabriela Islas ◽  
José A. Rodríguez ◽  
M. Elena Páez-Hernández ◽  
Silvia Corona-Avendaño ◽  
Alberto Rojas-Hernández ◽  
...  
Keyword(s):  
Capillary Electrophoresis ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Phase Extraction ◽  
Dispersive Solid Phase Extraction ◽  
Milk Samples

scholarly journals Magnetic Solid-Phase Extraction Based onβ-Cyclodextrins/Acrylic Acid Modified Magnetic Gelatin for Determination of Moxidectin in Milk Samples

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Yinzhu Shang ◽  
Jing Luo ◽  
Peng Wang ◽  
Xiaoya Zhao ◽  
Cheng Ye ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Magnetic Solid Phase Extraction ◽  
Phase Extraction ◽  
Milk Samples ◽  
Relative Standard ◽  
Magnetic Solid ◽  
Target Molecules

β-Cyclodextrins/acrylic acid modified magnetic gelatin was prepared and then employed as the magnetic solid-phase extraction (MSPE) sorbent for extraction of moxidectin in milk samples. Due to the rigidity of hydrophobic cavity ofβ-cyclodextrins and carboxyl groups of acrylic acid, magnetic composites are prepared to form a complex with target molecules through various kinds of chemical reactions and then showed excellent extraction performance. This method exhibits the advantages of simplicity of implementation, short extraction time (5 min), low solvent consumption, and high extraction efficiency. A rapid, simple, and effective method for the analysis of moxidectin in milk samples was established by MSPE coupled with liquid chromatography-fluorescence detection. The limit of detection was 0.1 ng·mL−1and the recoveries from milk samples were in the range of 93.8%–112.5%. The relative standard deviation was not higher than 6.4%. In conclusion, magnetic solid-phase extraction is a simple and robust preconcentration technique that can be coupled to other analytical methods for the quantitative determination of target molecules in complex samples.

Determination of herbicides in mineral and stagnant waters at ng/L levels using capillary electrophoresis and UV detection combined with solid-phase extraction and sample stacking

2005 ◽  
Vol 1070 (1-2) ◽  
pp. 171-177 ◽  
Author(s):  
Javier Hernández-Borges ◽  
Francisco J. García-Montelongo ◽  
Alejandro Cifuentes ◽  
Miguel Ángel Rodríguez-Delgado
Keyword(s):  
Capillary Electrophoresis ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Uv Detection ◽  
Phase Extraction ◽  
Sample Stacking

scholarly journals Application of d-SPE before SPE and HPLC-FLD to Analyze Bisphenols in Human Breast Milk Samples

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4930
Author(s):  
Tomasz Tuzimski ◽  
Szymon Szubartowski
Keyword(s):  
Breast Milk ◽  
Solid Phase Extraction ◽  
High Performance ◽  
Solid Phase ◽  
Diglycidyl Ether ◽  
Human Breast Milk ◽  
Phase Extraction ◽  
Human Breast ◽  
Milk Samples ◽  
Relative Standard

In this study, we propose a simple, cost-effective, and sensitive high-performance liquid chromatography with fluorescence detection (HPLC-FLD) for the simultaneous determination of seven bisphenols (bisphenol F (BPF), bisphenol E (BPE), bisphenol B (BPB), BADGE (bisphenol A diglycidyl ether), BADGE∙2H2O, BADGE∙H2O, BADGE∙2HCl) in human breast milk samples. The dispersive solid phase extraction (d-SPE) coupled with solid phase extraction (SPE) procedure performed well for the majority of the analytes with recoveries in the range 57–88% and relative standard deviations (RSD%) of less than 9.4%. During the d-SPE stage, no significant matrix effect was observed thanks to the application of different pairs of salts such as zirconium-dioxide-based sorbents (Z-Sep or Z-Sep +) and primary secondary amine (PSA) or QuEChERS Enhanced Matrix Removal-Lipid (EMR-Lipid) and PSA. The method limits of quantification (mLOQs) for all investigated analytes were set at satisfactory low values in the range 171.89–235.11 ng mL−1. Analyte concentrations were determined as the average value from human breast milk matrix samples. The results show that the d-SPE/SPE procedure, especially with the application of EMR-Lipid and PSA, could be used for further bisphenol analyses in human breast milk samples.

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