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Your search keyword '"da Silva, Mariana C."' showing total 11 results
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11 results on '"da Silva, Mariana C."'

6. Impact of positive biphasic pressure during low and high inspiratory efforts in Pseudomonas aeruginosa-induced pneumonia

Author

da Cruz, Daniela G., primary, de Magalhães, Raquel F., additional, Padilha, Gisele A., additional, da Silva, Mariana C., additional, Braga, Cassia L., additional, Silva, Adriana R., additional, Gonçalves de Albuquerque, Cassiano F., additional, Capelozzi, Vera L., additional, Samary, Cynthia S., additional, Pelosi, Paolo, additional, Rocco, Patricia R. M., additional, and Silva, Pedro L., additional

Published
2021
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8. Molecular Detection of HPV and Chlamydia trachomatis Infections in Brazilian Women with Abnormal Cervical Cytology

Author

de Abreu, André L. P., primary, Teixeira, Jorge J. V., additional, Nogara, Paula R. B., additional, da Silva, Mariana C., additional, Tognim, Maria C. B., additional, Zanko, Rodrigo L., additional, Souza, Raquel P., additional, Consolaro, Marcia E. L., additional, Uchimura, Nelson S., additional, Gimenes, Fabrícia, additional, and Ferreira, Érika C., additional

Published
2012
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11. Simultaneous Extraction of Pesticides and Polycyclic Aromatic Hydrocarbons in Brazilian Cachaça Using a Modified QuEChERS Method Followed by Gas Chromatography Coupled to Tandem Mass Spectrometry Quantification.

Author

da Silva MC, Oliveira MLG, Augusti R, and Faria AF

Subjects
Brazil, Food Contamination analysis, Limit of Detection, Alcoholic Beverages analysis, Gas Chromatography-Mass Spectrometry methods, Pesticide Residues chemistry, Pesticide Residues isolation & purification, Polycyclic Aromatic Hydrocarbons chemistry, Polycyclic Aromatic Hydrocarbons isolation & purification, Solid Phase Extraction methods, Tandem Mass Spectrometry methods
Abstract

A modified QuEChERS method was optimized for simultaneous extraction of 93 pesticides and 6 polycyclic aromatic hydrocarbons (PAHs) in cachaça. The procedure employed 20 mL of sample, 10 mL of dichloromethane, 1 g of NaCl, and 6 g of MgSO 4 . The methods were validated in accordance with pesticide tolerances set by the National Health Surveillance Agency of Brazil and government guidelines of Brazil and the European Union. The linearity of all curves was adequate, with calculated t r higher than the critical value, at the 95% confidence level. For pesticides, recoveries ranged between 86.7 and 118.2%, relative standard deviation (RSD) ≤ 20%, at least at two concentration levels, and limit of detection (LOD) and limit of quantitation (LOQ) were 2.5 and 10.0 μg L -1 , respectively. For PAHs, recoveries ranged between 84.8 and 111.5%, RSD was between 6.2 and 27.3%, LOD and LOQ were 0.25 and 1.0 μg L -1 , respectively. The combined standard uncertainty was lower than 50% of the relative expanded uncertainty value at concentration levels of greater relevance in both methods. Analyses of five commercial samples detected the presence of 9 pesticides (10.0-128.0 μg L -1 ) and 6 PAHs (2.0-4.0 μg L -1 ), indicating the need for a specific legislation for Brazilian cachaça.

Published
2019
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