Novel sol–gel hybrid methyltrimethoxysilane–tetraethoxysilane as solid phase extraction sorbent for organophosphorus pesticides

Ibrahim, Wan Aini Wan; Veloo, Krishna Veni; Sanagi, Mohd Marsin

doi:10.1016/j.chroma.2012.01.022

Cited by 67 publications

(33 citation statements)

References 29 publications

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“…111 The hydrophilic silanol groups at the surface of the silica are generally coupled to hydrophobic alkyl or aryl functional groups by reaction with silanes, with C8 and C18 being some of the most widely used coatings. 112, 113 The use of monolithic columns is increasing because they can be prepared easily on-chip by UV polymerization without the need to form retaining structures like frits. 114, 115 In addition, the porosity and surface area of monoliths can be tuned by varying the monomer/porogen composition.…”

Section: Functions In Lab-on-a-chip Systemsmentioning

confidence: 99%

Advances in Microfluidic Materials, Functions, Integration, and Applications

2013

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Section: Functions In Lab-on-a-chip Systemsmentioning

confidence: 99%

Advances in Microfluidic Materials, Functions, Integration, and Applications

2013

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“…To investigate the performance of the proposed MSPE method, MNPs/TEOS-CNPrTEOS as adsorbent was compared with some other recently reported methods [15,[23][24][25][29][30][31]. As it is obvious in Supporting Information Table S1, the proposed method offers 2500, 500, 70, and 65 times lower LODs compared with Ti-CNPrTEOS, PDMS-CNPrTEOS, Carbograph, and SiO 2 /C 3 -CN, respectively, which were reported in other studies.…”

Section: Comparison With Other Resultsmentioning

confidence: 86%

Silica‐based magnetic hybrid nanocomposite for the extraction and preconcentration of some organophosphorus pesticides before gas chromatography

Malek

Nodeh

Akbari‐adergani

2018

J of Separation Science

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The precise control of pesticide residues in foodstuffs depends significantly on the clean extraction of analytes using specifically designed separation methods. In this study, a one-pot sol-gel process was used for the preparation of a magnetic hybrid silica gel tetraethylortho silicate-cyanopropyltriethoxy silane nanocomposite. The prepared material was characterized using energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, single-point specific surface area, and scanning electron microcopy. The synthesized magnetic hybrid material was used as a solid phase extraction sorbent for the extraction and preconcentration of some organophosphorus pesticides before gas chromatography with a microelectron capture detector. The performance of the proposed magnetic solid-phase extraction technique was validated by linearity (0.05-2 ng/mL), correlation coefficients (r = 0.9993-0.9997), limit of detection (0.02-0.06 ng/mL, S/N = 3, n = 3), and intraday (RSD = 1.5-8.7%, n = 3) and interday precision (RSD = 5.5-9.3%, n = 12), while the recovery in real samples and equilibrium adsorption capacity was 72.02-103.84% and 8-20 mg/g, respectively. The magnetic solid-phase extraction based on the hybrid nanocomposite revealed a high enrichment factor, an appropriate dynamic range, and great absorptive ability toward the selected organophosphorus pesticides spiked in real water samples.

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“…The comparisons of the LOD, RSD and extraction recovery of the presented preconcentration procedure were comparable and even better than those of the previously reported methods. The sensitivity of the proposed method was higher than some of the other sorbent such as C 18, RDSE and RP‐C 18 (Ballesteros & Parrado, ; Giordano, Richter, & Ahumada, ; Ibrahim, Veloo, & Sanagi, ).…”

Section: Resultsmentioning

confidence: 87%

Application of response surface methodology for optimization of trace amount of diazinon preconcentration in natural waters and biological samples by carbon mesoporous CMK‐3

Beirami

Barzoki

Bahramifar

2017

Biomedical Chromatography

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Preconcentration of trace amounts of diazinon by carbon mesoporous CMK-3 in water and biological samples and measurement by high-performance liquid chromatography were investigated. CMK-3 was prepared using hexagonal SBA-15 as the template. The synthesized materials were characterized by X-Ray diffraction (XRD), Fourier transform infrared spectroscopy, Brunaur-Emmet-Teller, transmission electron microscopy and Boehm titration method. The preconcentration procedure was optimized using a multivariate optimization approach following a two-stage process. The effect of analytical parameters including the amount of the CMK-3 as an adsorbent, pH, type and volume of eluent and flow rate of eluent and sample were studied by a screening project, then the effective parameters were optimized by response surface methodology based on central composite design. The average extraction efficiency of diazinon under optimal conditions (CMK-3 dosage = 25 mg, sample flow rate = 2.5 mL min , eluent flow rate = 1.25 mL min , volume of methanol as an eluent =3.5 mL and initial pH = 6) was 97.11%, which agrees well with the predicted response value (97.93%). The linearity of the method was in the range of 0.5-100 μg L with a correlation coefficient of 0.997. Enrichment factor, limit of detection and limit of quantification were 285.7, 0.09 and 0.23 μg L , respectively. The relative standard deviation (RSD) under optimum conditions was 2.21% (n = 5). The proposed method was applied to determine diazinon in real water and biological samples. Recovery of diazinon from real samples was between 95.80 and 104.94% with an RSD of 0.19-4.65%. Thus, this method is suitable for the preconcentration and determination of diazinon in real water and biological samples.

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Novel sol–gel hybrid methyltrimethoxysilane–tetraethoxysilane as solid phase extraction sorbent for organophosphorus pesticides

Cited by 67 publications

References 29 publications

Advances in Microfluidic Materials, Functions, Integration, and Applications

Advances in Microfluidic Materials, Functions, Integration, and Applications

Silica‐based magnetic hybrid nanocomposite for the extraction and preconcentration of some organophosphorus pesticides before gas chromatography

Application of response surface methodology for optimization of trace amount of diazinon preconcentration in natural waters and biological samples by carbon mesoporous CMK‐3

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