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Dive into the research topics where Carlos Eduardo Domingues Nazario is active.

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Featured researches published by Carlos Eduardo Domingues Nazario.


Journal of Separation Science | 2011

Optimization of in situ derivatization SPME by experimental design for GC-MS multi-residue analysis of pharmaceutical drugs in wastewater

Paulo Clairmont Feitosa de Lima Gomes; Juliana Y. Barletta; Carlos Eduardo Domingues Nazario; Álvaro J. Santos-Neto; Marya Anne Von Wolff; Cassiana Maria Reganhan Coneglian; Gisela de Aragão Umbuzeiro; Fernando M. Lanças

This paper presents the development of a procedure, which enables the analysis of nine pharmaceutical drugs in wastewater using gas chromatography-mass spectrometry (GC-MS) associated with solid-phase microextraction (SPME) for the sample preparation. Experimental design was applied to optimize the in situ derivatization and the SPME extraction conditions. Ethyl chloroformate (ECF) was employed as derivatizing agent and polydimethylsiloxane-divinylbenzene (PDMS-DVB) as the SPME fiber coating. A fractional factorial design was used to evaluate the main factors for the in situ derivatization and SPME extraction. Thereafter, a Doehlert matrix design was applied to find out the best experimental conditions. The method presented a linear range from 0.5 to 10 μg/L, and the intraday and interday precision were lower than 16%. Applicability of the method was verified from real influent and effluent samples of a wastewater treatment plant, as well as from samples of an industry wastewater and a river.


Analytical Methods | 2016

Development of on-line molecularly imprinted solid phase extraction-liquid chromatography-mass spectrometry for triazine analysis in corn samples

Felipe Nascimento Andrade; Carlos Eduardo Domingues Nazario; Álvaro J. Santos-Neto; Fernando M. Lanças

A highly selective method for the analysis of triazine herbicides in corn samples based on molecularly imprinted solid phase extraction (MISPE) has been developed. Molecularly imprinted polymers (MIPs) were synthesized by precipitation polymerization using atrazine as a template, methacrylic acid as a functional monomer, ethylene glycol dimethacrylate as a crosslinker, and 2,2′-azobis-isobutrynitrile as an initiator. MISPE was developed for the on-line and automated enrichment of atrazine, simazine, terbutryn, simetryn and ametryn from corn sample extracts. High-performance liquid chromatography and time-of-flight mass spectrometry were used for the separation and confident determination of the herbicides. The limits of detection and quantitation of the proposed method were set to be 1.6–3.3 μg kg−1 and 5.0–10.0 μg kg−1. The method was successfully applied for the analysis of five types of corns and the recoveries of the triazines from the spiked samples ranged from 80.2 to 119.1%.


Journal of Separation Science | 2014

Novel devices for solvent delivery and temperature programming designed for capillary liquid chromatography

Lincoln F. M. Coutinho; Carlos Eduardo Domingues Nazario; Alessandra Maffei Monteiro; Fernando M. Lanças

Analyses in chromatographic systems able to save mobile and stationary phases without reducing efficiency and resolution are of current interest. These advantages regarding savings have challenged us to develop a system dedicated to miniaturized liquid chromatography. This paper reports on the development of a high-pressure syringe-type pump, an oven able to perform isothermal and temperature programming and a software program to control these chromatographic devices. The experimental results show that the miniaturized system can generate reproducible and accurate temperature and flow rate. The system was applied to the separation of statins and tetracylines and showed excellent performance.


Trends in Analytical Chemistry | 2015

Recent advances and future trends in new materials for sample preparation

Bruno Henrique Fumes; Meire Ribeiro da Silva; Felipe Nascimento Andrade; Carlos Eduardo Domingues Nazario; Fernando M. Lanças


Journal of Chromatography A | 2015

Evolution in miniaturized column liquid chromatography instrumentation and applications: An overview.

Carlos Eduardo Domingues Nazario; Meire Ribeiro da Silva; Maraíssa Silva Franco; Fernando M. Lanças


Analytical Methods | 2014

Analysis of fluoxetine and norfluoxetine in human plasma by HPLC-UV using a high purity C18 silica-based SPE sorbent

Carlos Eduardo Domingues Nazario; Paulo Clairmont Feitosa de Lima Gomes; Fernando M. Lanças


Archive | 2018

Liquid Chromatography—Packed Capillary

Ana Lúcia de Toffoli; Edvaldo Vasconcelos Soares Maciel; Carlos Eduardo Domingues Nazario; Fernando M. Lanças


Scientia Chromatographica | 2017

Tecnologia sol-gel: uma ponte para modificar a seletividade no preparo de amostra

Carlos Eduardo Domingues Nazario; Thiago Gomes Ricci; Amandha Kaiser da Silva; Eduardo Sobieski Neto; Karla Regina Warszawski de Oliveira


Archive | 2017

New Materials for Green Sample Preparation

Meire Ribeiro da Silva; Bruno Henrique Fumes; Carlos Eduardo Domingues Nazario; Fernando M. Lanças


Comprehensive Analytical Chemistry | 2017

Chapter Eighteen - New Materials for Green Sample Preparation: Recent Advances and Future Trends

Meire Ribeiro da Silva; Bruno Henrique Fumes; Carlos Eduardo Domingues Nazario; Fernando M. Lanças

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