Poly(methyloctylsiloxane) immobilized on silica as a sorbent for solid-phase extraction of some pesticides

Vigna, Camila R.M.; Morais, Lais S.R.; Collins, Carol H.; Jardim, Isabel Cristina Sales Fontes

doi:10.1016/j.chroma.2006.03.034

Cited by 24 publications

(14 citation statements)

References 20 publications

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“…The results of LOD and LOQ for all pesticides are below the tolerance levels for these pesticides in foodstuffs, according to three regulation agencies (see also Table 2). The results for repeatability showed good precision [37] for the wet carrot samples, with RSD values between 6 and 20% for nine of the investigated pesticides. Table 3.…”

Section: Analytementioning

confidence: 79%

“…Additionally, the organic compounds immobilized by grafting reactions are dispersed in a monolayer, without cluster formation that could end up in blocked silica pores. This results in high stability and reproducible behavior of the organic phase regarding its physical properties for several extraction and chromatographic processes [12], such as matrix solid phase dispersion (MSPD) [13], SPE [14], and solid phase microextraction (SPME) [15,16]. New materials for extraction may result from modification of pre-existing solid phases or by the synthesis of new ones and have been used for several applications in water [17] and foodstuffs [18].…”

Section: Introductionmentioning

confidence: 99%

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p‐Nitro‐N‐propylaniline/silica: Synthesis, characterization, and its application in matrix solid phase dispersion for multiresidue analysis of pesticides in carrots

Abad

Winck

Benvenutti

et al. 2007

J of Separation Science

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A new material for matrix solid phase dispersion (MSPD) was synthesized -- p-nitro-N-propylaniline/silica (pNNPASi) by grafting reactions, characterized by elemental analysis and N(2)-adsorption-desorption isotherms, and tested for multiclass multiresidue analysis of pesticides in wet and freeze-dried carrots. Results obtained applying this new solid phase sorbent to MSPD extraction of ten pesticides (trichlorphon, trifluralin, dicloran, chlorothalonil, prometryn, linuron, captan, procymidone, prochloraz, and deltametrin) in wet carrots showed better results than the ones obtained for freeze-dried samples. Recoveries were in the range of 48-106% and precisions varied from 6 to 20% when wet samples were employed. Comparison between pNNPASi sorbent and C(18) showed better performance of pNNPASi for eight out of ten pesticides tested. The LOQs show that the developed method can be used to detect the pesticides investigated in carrots at concentrations below the maximum residue levels (MRL) established by EU, USEPA, and National Sanitary Surveillance Agency (ANVISA). Linuron, captan, prochloraz, and deltamethrin were found in at least one of the two commercial samples studied in concentrations above the LOQ of this method. Concentrations of the last three pesticides were above the European MRL in one of the commercial samples.

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Section: Analytementioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

p‐Nitro‐N‐propylaniline/silica: Synthesis, characterization, and its application in matrix solid phase dispersion for multiresidue analysis of pesticides in carrots

Abad

Winck

Benvenutti

et al. 2007

J of Separation Science

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“…The effect of humic acids, as the major interference on the extraction of selected compounds was also studied but no interferences caused by the presence of these compounds were observed by this method. Vigna et al [20] studied the use of poly(methyloctylsiloxane) (PMOS) laboratory-made SPE sorbent for the simultaneous extraction of imazethapyr, nicosulfuron, diuron, linuron, and chlorimuron-ethyl from water and their later separation and quantification by HPLC-DAD. [115] ( -) Data not reported in the publications.…”

Section: Spementioning

confidence: 99%

Pesticides analysis by liquid chromatography and capillary electrophoresis

Ravelo‐Pérez

Hernández-Borges

Rodríguez‐Delgado³

2006

J of Separation Science

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Nowadays, a wide range of pesticides are used in agricultural production, and their monitoring in samples of environmental and alimentary interest is of extreme importance to ensure, among others, the safety of consumption of foods. The aim of this work is to provide updated information about the major developments in CE and HPLC in pesticide analysis, covering relevant publications between 2004 and early 2006. The use of different sample pretreatment steps to provide a suitable extraction of these compounds from the different matrices as well as to increase the sensitivity of the determination is also discussed.

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“…6 For example, relative to LLE, SPE reduces the analytical time required (especially if automated methods are used), it can handle small samples, and it requires small volumes of solvents. For analytical purposes, SPE is usually performed using a small cartridge containing an appropriate packing for gas chromatographic (GC) 7 or highperformance liquid chromatography (HPLC) 8 analysis. In common practice, the adsorbed materials are eluted from the packing materials using a small amount of organic solvent.…”

Section: Introductionmentioning

confidence: 99%

Solid Phase Extraction of Neutral Analytes through Silica Gel Coated with Layers of Au Nanoparticles Self‐Assembled with Alkanethiols

Liu

2008

J Chinese Chemical Soc

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In this study, we used Au nanoparticle (NP)-coated silica gel as a solid phase extraction sorbent for the preconcentration of neutral analytes (steroid drugs). The sorbent was fabricated using two alkanethiol self-assembly processes: one to deposit the Au NPs onto a 3-aminopropyltrimethoxysilane-modified silica gel and the other to functionalize the surfaces of the Au NPs. A large volume of the steroid solution was passed through the silica gel to facilitate adsorption mediated by hydrophobic interactions between the steroids and the hydrophobic moieties on the silica gel surface. Extraction of the steroids was accomplished by flushing the silica gel with a low-polarity solvent. In this preliminary study, we found that the particle size of the silica gel and the number of layers of Au NPs coated on the silica gel both affected the preconcentration performance for the steroids. When using six layers of Au NPs coated on 5-20-mm silica gel, the detection limits for steroids were below 80 ng L -1 ; the preconcentration efficiency was over 170-fold higher than that of the original steroid solution. Our findings provide further evidence that nanotechnology has much to benefit analytical science.

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Poly(methyloctylsiloxane) immobilized on silica as a sorbent for solid-phase extraction of some pesticides

Cited by 24 publications

References 20 publications

p‐Nitro‐N‐propylaniline/silica: Synthesis, characterization, and its application in matrix solid phase dispersion for multiresidue analysis of pesticides in carrots

p‐Nitro‐N‐propylaniline/silica: Synthesis, characterization, and its application in matrix solid phase dispersion for multiresidue analysis of pesticides in carrots

Pesticides analysis by liquid chromatography and capillary electrophoresis

Solid Phase Extraction of Neutral Analytes through Silica Gel Coated with Layers of Au Nanoparticles Self‐Assembled with Alkanethiols

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