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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Microextraction by packed sorbent liquid chromatography with time-of-flight mass spectrometry of triazines employing a molecularly imprinted polymer

Texto completo
Autor(es):
Andrade, Felipe Nascimento [1] ; Santos-Neto, Alvaro Jose [1] ; Lancas, Fernando Mauro [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF SEPARATION SCIENCE; v. 37, n. 21, p. 3150-3156, NOV 2014.
Citações Web of Science: 27
Resumo

Molecularly imprinted polymers for the determination of triazines were synthesized by precipitation using atrazine as template, methacrylic acid as functional monomer, ethylene glycol dimethacrylate as crosslinker, and 2,2 `-azobisisobutrynitrile as initiator. The polymers were characterized by infrared spectroscopy and scanning electron microscopy and packed in a device for microextraction by packed sorbent aiming for the preconcentration/cleanup of herbicides, such as atrazine, simazine, simetryn, ametryn, and terbutryn in corn samples. Liquid chromatography coupled with time-of-flight mass spectrometry was used for the separation and determination of the herbicides. The selectivity coefficient of molecularly imprinted polymers was compared with that of nonimprinted polymer for the binary mixtures of atrazine/propanil and atrazine/picloram, and the values obtained were 15.6 and 2.96, respectively. The analytical curve ranged from 10 to 80 mu g/kg (r = 0.989) and the limits of detection and quantification in the corn matrices were 3.3 and 10 mu g/kg, respectively. Intra-and interday precisions were < 14.8% and accuracy was better than 90.9% for all herbicides. Polymer synthesis was successfully applied to the cleanup and preconcentration of triazines from fortified corn samples with 91.1-109.1% of recovery. (AU)

Processo FAPESP: 11/09898-4 - Desenvolvimento de polímeros molecularmente impressos e seu uso para o preparo de amostras e análise de triazinas e sulfoniluréias em milho utilizando cromatografia líquida de alta eficiência (HPLC)
Beneficiário:Felipe Nascimento Andrade
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 10/19910-9 - Desenvolvimento de estratégias de química verde em cromatografia e aplicação na avaliação da degradação de antibióticos em águas residuárias por biorreatores anaeróbios de leito fixo
Beneficiário:Alvaro José dos Santos Neto
Linha de fomento: Auxílio à Pesquisa - Regular