Modified Quechers
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Determination of Ethyl Carbamate in Commercial Sweetened Sugar Cane Spirit by ESI-MS/MS Using Modified QuEChERS and 18-Crown-6/Trifluoroacetic Acid Spiking Additives
A fast, sensitive, and selective direct injection electrospray tandem mass spectrometry (DI ESI MS/MS) method that is able to quantify ethyl carbamate in commercial sweetened sugar cane spirit is described. The preparation method uses a modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) with potassium carbonate added to sweetened sugar cane
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Validation of an UHPLC-MS/MS Method for the Determination of Malachite Green, Leucomalachite Green, Crystal Violet, and Leucocrystal Violet in Shrimp, Fish, and Salmon Muscle Using a Modified QuEChERS Approach
A quantitative and confirmatory method for detecting the presence of triphenylmethane dyes in shrimp muscle using ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) and a quick, easy, cheap, effective, rugged and safe (QuEChERS) extraction approach was validated. The method exhibited linearity and selectivity and the coeffici
J. Braz. Chem. Soc.. Publicado em: 2021-04
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3. OTIMIZAÇÃO E VALIDAÇÃO DE MÉTODO BASEADO EM QuEChERS PARA DETERMINAÇÃO DE CONSERVANTES EM COSMÉTICOS POR HPLC-DAD
Parabens are widely used as preservatives in the last decades. Others preservatives such as 2-phenoxyethanol, which in addition to his good antimicrobial activity, has low allergenic potential as well others properties of interest to the cosmetic industry. In this work was developed a method for determination of methylparaben (MP), propylparaben (PP) and 2-p
Quím. Nova. Publicado em: 2020-02
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4. Determination of Phenolic Compounds in Red Sweet Pepper (Capsicum annuum L.) Using a Modified QuEChERS Method and UHPLC-MS/MS Analysis and Its Relation to Antioxidant Activity
In the present work, a fast, easy and efficient analytical method was developed and validated for the determination of phenolic compounds (4-hydroxybenzoic, vanillic, caffeic, p-coumaric, sinapic, ferulic and ellagic acids, and naringenin) in red sweet pepper. Extraction of phenolic compounds was carried out using the quick, easy, cheap, effective, rugged an
J. Braz. Chem. Soc.. Publicado em: 23/05/2019
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5. Evaluation of QuEChERS Sample Preparation and Gas Chromatography Coupled to Mass Spectrometry for the Determination of Pesticide Residues in Grapes
An effective analytical method for pesticides multiresidue determination in grape samples was developed and validated. A modified quick, easy, cheap, effective, robust and safe (QuEChERS) method was used to extract the target compounds. Several sorbent materials were tested for the clean-up step using dispersive solid phase extraction (d-SPE) and Florisil®
J. Braz. Chem. Soc.. Publicado em: 2016-09
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6. Comparison and evaluation of two methods for the pesticide residue analysis of organophosphates in yerba mate
Abstract Microwave Assisted Extraction and a modified CEN-QuEChERS methodology were evaluated as extraction and clean up procedures for the simultaneous analysis of 42 organophosphate pesticides in yerba mate (Ilex paraguaiensis). The obtained extracts were analyzed by gas chromatography using a flame photometric detector. Linearity, recovery percentages, re
Rev. bras. farmacogn.. Publicado em: 2015-04
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7. Multiresidue determination of pesticide residues in honey by modified QuEChERS method and gas chromatography with electron capture detection
O mel pode apresentar resíduos de pesticidas devido à contaminação das abelhas durante a coleta de pólen e néctar ou por tratamento das colmeias. Assim, a determinação de resíduos de pesticidas em mel é de grande importância, apesar da dificuldade devido à complexidade da matriz. Neste estudo, um novo método para a determinação de pesticidas d
J. Braz. Chem. Soc.. Publicado em: 2014-08
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8. Determinação de resíduos de agrotóxicos em leite bovino empregando método QuEChERS modificado e GC-MS/MS
Considering the possibility that pesticides used in cattle raising produce residues in milk and cause harm to public health, this study developed a multiresidue method for determination of pesticide residues in bovine milk, using a modified QuEChERS method for sample preparation, and quantification by GC-MS/MS. The method proved to be efficient, resulting in
Quím. Nova. Publicado em: 2014-06
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9. Optimization of chromatographic conditions and comparison of extraction efficiencies of four different methods for determination and quantification of pesticide content in bovine milk by UFLC-MS/MS
This paper describes the optimization of a multiresidue chromatographic analysis for the identification and quantification of 20 pesticides in bovine milk, including three carbamates, a carbamate oxime, six organophosphates, two strobilurins, a pyrethroid, an oxazolidinedione, an aryloxyphenoxypropionate acid/ester, a neonicotinoid, a dicarboximide, and thre
Quím. Nova. Publicado em: 2014
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10. DETERMINAÇÃO DE RESÍDUOS DE AGROTÓXICOS NO LEITE BOVINO EMPREGANDO MÉTODO QuEChERS MODIFICADO E GC-MS/MS / DETERMINATION OF PESTICIDE RESIDUES IN CATTLE MILK USING MODIFIED QuEChERS METHOD AND GC-MS/MS
Por oferecer uma composição equilibrada, o leite é considerado um dos alimentos in natura mais completos nutricionalmente, sendo um produto muito bem aceito no mercado e tendo consumidores de todas as idades. Sendo assim, a análise da qualidade do leite é de grande importância para informação do consumidor e verificação dos parâmetros exigidos pel
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/03/2012
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11. DETERMINAÇÃO DE DISRUPTORES ENDÓCRINOS EM FILÉ DE PEIXE UTILIZANDO QuEChERS MODIFICADO E GC-(TQ)MS/MS / DETERMINATION OF ENDOCRINE DISRUPTERS IN FISH FILLET BY MODIFIED QuEChERS AND GC-(TQ)MS/MS
Compostos conhecidos como disruptores endócrinos (DEs), tais como agrotóxicos, alquilfenóis, hormônios, dentre outras classes de substâncias são responsáveis pela alteração de funções do sistema endócrino. Esse efeito ocorre quando os DEs interagem com os receptores hormonais, alterando os padrões de resposta natural do sistema endócrimo. Os or
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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12. MÉTODOS INDIVIDUAL E MULTIRRESIDUAL PARA DETERMINAÇÃO DE PESTICIDAS EM GRÃOS E DERIVADOS POR GC-PFPD, GC-ITD-MS E LC-MS/MS / SINGLE AND MULTI-RESIDUE METHODS FOR PESTICIDE ANALYSIS IN GRAINS AND DERIVATES BY GC-PFPD, GC-ITD-MS AND LC-MS/MS
Due to the complexity of grains like soybean, corn and rice, and the very low pesticide concentration expected for these samples, it is really necessary to develop efficient and reliable analytical methods to identify and quantify their residues. The possibility to perform the determination of a large number of pesticides in just a single chromatographic ana
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/08/2011