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Download Citation | Determination of Four Carbamate Pesticides in Corn by Cloud Point Extraction and High-Performance Liquid Chromatography in the Visible Region Based on Their Derivatization ...
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Therefore, temperature-assisted methods are not suitable for carbamate extraction. The EPA recommends Method 8318, using solid–liquid extraction [23], ultrasonication [4], [24] and supercritical fluid extraction (SFE) [5], [25] as a suitable extraction means for carbamates in soil and sediment samples.
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Determination of carbamate and urea pesticide residues in fresh vegetables using microwave-assisted extraction and liquid chromatography Paula Paı´ ga, Simone Morais, Manuela Correia, Cristina Delerue-Matos and Arminda Alves An analytical multiresidue method for the simultaneous determination of seven pesticides in fresh vegetable …
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Ultrasonic-assisted extraction (UAE) and pressurized liquid extraction (PLE) are the commonly used techniques that are based on new sources of energy. One …
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A method was developed by coupling TpDB as SPE sorbents with high performance liquid chromatography-ultraviolet (HPLC-UV) detection to determine trace carbamate pesticides in vegetables. The established method showed a wide linear range of 0.1-200 ng mL-1 and low limit of detections (0.005-0.05 ng mL-1) for four carbamate …
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A solid phase extraction (SPE) method with a porous organic polymer as adsorbent was established for the extraction of five carbamate pesticides (metolcarb, carbaryl, isoprocarb, bassa and diethofencarb) from milk, white wine and juice samples prior to high performance liquid chromatography-diode array detection. The main factors …
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Current analytical techniques for EC commonly include gas or liquid chromatography. Mitigation strategies can reduce EC concentrations in foods and …
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Ethyl carbamate (EC), a chemical substance widely present in fermented food products and alcoholic beverages, has been classified as a Group 2A carcinogen …
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The DABP-GO showed to be an effective solid-phase extraction (SPE) adsorbent for carbamate pesticides. A SPE method with the DABP-GO as the adsorbent combined with high-performance liquid chromatography with ultraviolet detection was established to determine trace carbamate residues in vegetable samples …
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Sandahl M., Mathiasson L., Jonsson J.A. Determination of thiophanate-methyl and its metabolites at trace level in spiked natural water using the supported liquid membrane extraction and the microporous membrane liquid-liquid extraction techniques combined on-line with high-performance liquid chromatography. J. Chromatogr. A.
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Simple dispersive liquid–liquid microextraction using a low-density solvent coupled with high-performance liquid chromatography was developed for the …
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Recently, various sample pretreatment methods, such as liquid-liquid extraction (LLE) (3), solid-phase microextraction (SPME) (6), dispersive liquid-liquid microextraction (DLLME) (14), magnetic ...
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In this procedure, the preformed ammonium carbamate in heptane was used to extract the metal ion from an aqueous solution of Ln 3+ (obtained by dissolving Ln 2 O 3 in HCl). The rapid formation of the carbamato complex and the balanced lipophilicity provided by the amine allowed its extraction in the organic layer while retaining the [R 2 …
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The most traditional extraction method is a liquid-liquid extraction. Methylene chloride is commonly used as the organic solvent since EC is a weak polar compound. Solid-phase …
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Background: A simple and effective extraction method based on ultrasonic solvent extraction and liquid-liquid microextraction (as the cleaning step) was developed to determine seven pesticide residues in roasted coffee (Coffea arabica) using ultra-performance LC-tandem MS. Objective: Different parameters of the method were …
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1. Introduction. Ethyl carbamate (EC) content of food products presents potential toxicity for human health (Weber & Sharypov, 2009).Also known as urethane, EC with a chemical formula of NH 2 COOCH 2 CH 3 is a naturally occurring compound in fermented foods and beverages, thus also in wine. The use of Baycovin as a …
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1. Introduction. The carcinogenic and mutagenic effect of Ethyl Carbamate (EC, urethane, C 2 H 5 OCONH 2) was initially discovered in animals in the 1940 s, and it was classified as a group 2A carcinogen (probably carcinogenic to humans) by the World Health Organization's International Agency for Research on Cancer (IARC) (IARC, …
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Corpus ID: 101731786; Application of liquid/liquid extraction in determination of ethyl carbamate in liquor. @article{Yuanzi2015ApplicationOL, title={Application of liquid/liquid extraction in determination of ethyl carbamate in liquor.}, author={Li Yuanzi and Huang Shiyong and Guo Xuewu and Du Liping and Chen Yefu and Xiao Dongguang}, …
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Magnetic Solid-Phase Extraction of Carbamate Pesticides Using Magnetic Metal–Organic Frameworks Derived from Benzoate Ligands, Followed by Digital Image Colorimetric Screening and High ...
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Several sample preparation methods have been developed for extraction of carbamate pesticides from water, mainly liquid–liquid extraction (LLE) [24], [25] and SPE [26], [27]. Solid-phase microextraction (SPME) is a relatively new extraction technique compared to LLE and SPE.
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Abstract In this work, derivatization of ethyl carbamate (EC) with 9-xanthydrol prior to liquid chromatography with fluorimetric detection (HPLC-FLD) was revisited, focusing on refining the reaction conditions and on automation. Perchloric acid was used for sample acidification and a sequence of operations was defined to perform …
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In the present study, an elevated temperature homogeneous liquid extraction coupled with ionic liquid‑based dispersive liquid–liquid microextraction was developed to extract five carbamate ...
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A cloud-point extraction (CPE) method using Triton X-114 non-ionic surfactant was developed for the extraction and preconcentration of carbamate insecticide residues (i.e., methomyl, propoxur, carbofuran, carbaryl, isoprocarb, and promecarb) in fruit samples. The optimum conditions of CPE were 1.5% (w/v) Triton X-114, 7.0% (w/v) …
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Magnetic Solid-Phase Extraction of Carbamate Pesticides Using Magnetic Metal−Organic Frameworks Derived from Benzoate Ligands, Followed by Digital Image Colorimetric …
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A rapid and accurate analytical method based on online solid phase extraction/purification-high performance liquid chromatography-tandem mass spectrometry (online SPE-HPLC-MS/MS) was established for the determination of eight carbamate pesticides in tomato, rice, and cabbage. ... the mobile phases) was 90∶10 and 35∶65, the eight carbamate ...
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A multiresidue approach using microwave-assisted extraction and liquid chromatography with photodiode array detection was investigated for the determination of butylate, carbaryl, carbofuran ...
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Semantic Scholar extracted view of "Permeabilization of Haematococcus pluvialis and solid-liquid extraction of astaxanthin by CO2-based alkyl carbamate ionic liquids" by K. Khoo et al. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 220,066,479 papers from all fields of science ...
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Ethyl carbamate (EC) or urethane is the ethyl ester of carbamic acid. It occurs at low level, from ng/L to mg/L, in many fermented foods and beverages. Ethyl …
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Graphene-based magnetic nanoparticles, comprising zero-valent iron, iron oxide–oxyhydroxide and graphene, were prepared through a simple one-step synthesis method, and subsequently applied to magnetic solid-phase extraction for the determination of trace carbamate pesticides in tomatoes coupled with high performance liquid …
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@article{Zhou2009DeterminationOF, title={Determination of four carbamate pesticides in corn by cloud point extraction and high-performance liquid chromatography in the visible region based on their derivatization reaction.}, author={Zhi-ming Zhou and Jian-Bo Chen and Dao-yuan Zhao and Ming-min Yang}, journal={Journal of agricultural …
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