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Influência de modificadores orgânicos na determinação de chumbo em amostras de suplementos de cálcio por GF AAS
(Universidade Federal de Santa Maria, 2004-03-04)
The main goal of this study was to evaluate the effect of organic modifiers in the determination of lead in calcium supplement samples by graphite furnace atomic absorption spectrometry (GF AAS). Samples of refined calcium ...
Estudo da influência de modificadores químicos para a determinação de chumbo por GF AAS na presença de sulfatos
(Universidade Federal de Santa Maria, 2005-03-03)
Lead determination by graphite furnace atomic absorption spectrometry may be affected by some interferences. Several authors have reported that lead determination may be affected in the presence of some salts (carbonates ...
Determinação de cádmio e manganês com pré-concentração por FI-FAAS e aplicação em aditivo alimentar à base de fosfatos
(Universidade Federal de Santa Maria, 2005-09-02)
Cadmium is a toxic element even at low concentration and is no essential for human metabolism, while Mn is essential and no toxic at low concentration. For that reason, it is important to have sensitive and accurate methods ...
Síntese de 4-(fur-2-il)- e 4-(tien-2-il)-pirimidinas a partir de β-Alcoxivinil trifluormetil cetonas
(Universidade Federal de Santa Maria, 2005-08-01)
The cyclocondensation of the 1,1,1-trifluoro-4-methoxy-4-(2-heteroaryl)-3-buten-2-ones (heteroaryl = furyl and thienyl) with urea and amidines (acetamidine, benzamidine, guanidine, 1H-pyrazole-1-carboxamidine and ...
Caleol: modificações estruturais, estereoquímica absoluta e atividade antimicrobiana dos derivados
(Universidade Federal de Santa Maria, 2011-02-24)
The essential oil of the leaves of Calea clematidea, a plant of Asteraceae
family used in the folk medicine in treatment of flu, stomachic disease and gastric
ulcer, was extracted and of it was isolated the monoterpene ...
Análise fitoquímica e estudo das atividades antimicrobiana, antioxidante e de inibição da enzima acetilcolinesterase das espécies Zanthoxylum rhoifolium e Zanthoxylum hyemale
(Universidade Federal de Santa Maria, 2010-10-22)
The present study was designed to evaluate the biological activity from the stem bark of Zanthoxylum rhoifolium and Zanthoxylum hyemale. The neutral methanol extract and
fractions of this extract, the basic fractions that ...
5-Hidróxi-4,5-Diidro-1h-1-(2-hidroxibenzoil)pirazóis: planejamento, síntese e analgesia
(Universidade Federal de Santa Maria, 2007-02-23)
An efficient method to obtain six 4-alkoxy-2-oxo-but-3-enoic acid ethyl esters [EtO2CC(O)C(R2)=C(R1)OR, where R1/R2/R = Me/H/Me (2a), Ph/H/Me (2b), 4-MeC6H4/H/Me (2c), 4-BrC6H4/H/Me (2d), 4-FC6H4/H/Me (2e), H/Me/Et (2f)] ...
Desenvolvimento de método para determinação de resíduos de agrotóxicos em azeite de oliva empregando GC-MS/MS
(Universidade Federal de Santa Maria, 2022-03-16)
In Brazil, olive oil is defined as a product obtained from the fruits of the olive tree Oleaeuropaea L. and it is already configured in the international scenario as the second largest importer of olive oil. Olive oil has ...
Síntese de 1,3-oxazinas e 1,2,3-triazóis derivados de cumarina
(Universidade Federal de Santa Maria, 2019-02-19)
In this work we developed a methodology for the synthesis of 1,3-oxazines
derived from aminocoumarins by the hydroxymethylation/acetalization reaction with
aldehydes catalyzed by H2SO4 in aqueous media. The scope and ...
Sintese e avaliação como fotossensibilizadores de novos triazoil-fulerenos funcionalizados com AZT e com calcogenos derivados de AZT
(Universidade Federal de Santa Maria, 2014-08-07)
Herein we report the synthesis of a new class of AZT-functionalized fullerenes. The synthetic strategic furnished the desired products in few reactional steps, in a convergent manner, in yields ranging from 22 to 43 ...