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Your search keyword '"Paulo Renato de Oliveira"' showing total 2 results
Start Over Author "Paulo Renato de Oliveira" Topic chemistry
2 results on '"Paulo Renato de Oliveira"'

1. Determination of etoricoxib in human plasma using automated on-line solid-phase extraction coupled with LC-APCI/MS/MS

Author

Sérgio Luiz Dalmora, Liberato Brum Junior, Ricardo Machado Ferretto, Paulo Renato de Oliveira, Thiago Barth, and Maximiliano da Silva Sangoi

Subjects
etoricoxib, LC-APCI/MS/MS, on-line solid-phase extraction, Chemistry, QD1-999
Abstract

A liquid chromatography-tandem mass spectrometry method with atmospheric pressure chemical ionization (LC-APCI/MS/MS) was validated for the determination of etoricoxib in human plasma using antipyrin as internal standard, followed by on-line solid-phase extraction. The method was performed on a Luna C18 column and the mobile phase consisted of acetonitrile:water (95:5, v/v)/ammonium acetate (pH 4.0; 10 mM), run at a flow rate of 0.6 mL/min. The method was linear in the range of 1-5000 ng/mL (r²>0.99). The lower limit of quantitation was 1 ng/mL. The recoveries were within 93.72-96.18%. Moreover, method validation demonstrated acceptable results for the precision, accuracy and stability studies.

Published
2008
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2. Growth and nutritional status and quality of Khaya senegalensis seedlings

Author

Marcia Alves Souza, Edvan Alves Chagas, Paulo Renato de Oliveira Fagundes, Oscar José Smiderle, and Aline das Graças Souza

Subjects
Ocean Engineering, engineering.material, Khaya, lcsh:Agriculture, Nutrient, Dry weight, Transplanting, lcsh:Agriculture (General), lcsh:Environmental sciences, 040101 forestry, lcsh:GE1-350, biology, Chemistry, Forest nutrition, General Engineering, lcsh:S, 04 agricultural and veterinary sciences, biology.organism_classification, lcsh:S1-972, Nutrient solution, Transplantation, Horticulture, Seedling, Shoot, 040103 agronomy & agriculture, engineering, 0401 agriculture, forestry, and fisheries, Fertilizer, Senegal mahogany
Abstract

PALAVRAS-CHAVE Mogno africano Nutricao florestal Solucao nutritiva ABSTRACT: Due to the shortage of information on both mineral fertilizer and organic substrate in Khaya senegalensis, it was proposed in the current study to verify the potential of the use or not of addition of nutrient solution in the production of high quality seedlings of K. senegalensis as well as to obtain the total accumulation of macro and micronutrients in the seedlings. The experimental design was completely randomized in a factorial 2x6, being the first factor constituted by the presence and nutritious solution absence of and the second factor for times evaluation (0, 60, 80, 100, 120 and 140 days after transplanting) repetitions with four seedlings. The following growth traits (height, stem diameter and shoot and root dry mass) and seedling quality parameters (total dry mass and Dickson quality index). The addition of nutrient solution supported the increase of the determined morphological characteristics of the seedlings of K. senegalensis as well as the total accumulation of macro and micronutrients. The nutrient solution modifies the absorption dynamics of nutrients in K. senegalensis and the amount absorbed at 140 days after transplantation obeys according to the order: N>K>P>Ca>S>Mg> Fe>B>Mn>Zn>Cu.

Published
2016

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