Preparation of a restricted access material–macroporous hybrid monolithic column – for on-line solid-phase extraction of the sulfonamides residues from honey

2015 ◽  
Vol 7 (4) ◽  
pp. 1563-1571 ◽  
Author(s):  
Yun-Kai Lv ◽  
Zhi-Yong Guo ◽  
Jin-Zhi Wang ◽  
Meng-Meng Guo ◽  
Lin-Kang Yu ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Monolithic Column ◽  
Phase Extraction ◽  
Restricted Access Material ◽  
Steel Column ◽  
On Line ◽  
Stainless Steel Column ◽  
Hybrid Monolithic Column

A novel RAM–HMC with superior enrichment and clean-up efficiency was prepared by an in situ method in a stainless-steel column, and used as a pre-column for on-line solid-phase extraction of sulfonamides residues from honey.

scholarly journals Atrazine and 2, 4-D determination in corn samples using microwave assisted extraction and on-line solid-phase extraction coupled to liquid chromatography.

2018 ◽  
Vol 62 (2) ◽  
Author(s):  
Ana Susana Santos-Hernández ◽  
Laura Hinojosa-Reyes ◽  
Isabel del Carmen Sáenz-Tavera ◽  
Aracely Hernández-Ramírez ◽  
Jorge Luis Guzmán-Mar
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Monolithic Column ◽  
Correlation Coefficients ◽  
Sample Pretreatment ◽  
Enrichment Factors ◽  
Sample Volume ◽  
Phase Extraction ◽  
Microwave Assisted ◽  
On Line

<p>On-line sample pretreatment (clean-up and analyte preconcentration) was coupled to sequential injection chromatography for the determination of 2, 4-D (2,4-dichlorophenoxyacetic acid) and atrazine in corn samples. Prior to their analysis, microwave-assisted approach was evaluated and optimized for the extraction of 2,4-D and atrazine in corn samples. Extraction was carried out using MeOH:water (30:70 v/v) solvent at 50°C for 15 min. The on-line SPE-HPLC/UV approach combined reversed solid-phase extraction using strata X sorbent with MeOH:H<sub>2</sub>O (80:20 v/v) at 1 mL min<sup>-1</sup> as eluent for the enrichment of the analytes. C18 monolithic column with acetonitrile:10 mM acetate buffer pH 4 (20:80, v/v) was employed as mobile phase at 2 mL min<sup>-1</sup> flow rate for separation of the compounds before UV detection. Enrichment factors up to 13.4 were achieved with a 10 mL sample volume. The developed procedure showed linear response ranges from 0.07–0.70 mg kg<sup>−1 </sup>for 2,4-D and atrazine with correlation coefficients &gt;0.993. The LODs were 0.03 and 0.02 mg kg<sup>-1 </sup>for 2,4-D and atrazine, respectively with RSD ranged from 4.0 to 7.2 % at 0.07 and 0.30 mg kg<sup>-1</sup>. The recoveries of 2,4-D and atrazine in corn samples were from 82.6 and 98.2%. The proposed method showed good recoveries and reasonable precision for herbicide analysis in corn samples avoiding the time-consuming batch sample pretreatment step, thus minimizing risks of sample contamination and analyte losses.</p>

3D printed fluidic platform with in-situ covalently immobilized polymer monolithic column for automatic solid-phase extraction

2020 ◽  
Vol 1111 ◽  
pp. 40-48 ◽  
Author(s):  
Enrique Javier Carrasco-Correa ◽  
David J. Cocovi-Solberg ◽  
José Manuel Herrero-Martínez ◽  
Ernesto Francisco Simó-Alfonso ◽  
Manuel Miró
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Monolithic Column ◽  
Phase Extraction ◽  
Polymer Monolithic Column ◽  
3D Printed
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