4 documents found, page 1 of 1
Furfural - da biomassa ao laboratório de química orgânica
Ribeiro,Paulo Roberto; Carvalho,José Roque Mota; Geris,Regina; Queiroz,Vinícius; Fascio,MiguelThe goal of this manuscript is provide to students of Chemistry and related areas an alternative experiment in which they can obtain a compound and learn to observe and interpret properties and predict organic structure by obtaining furfural from biomass. Furfural is an organic compound, obtained through acid hydrolysis of pentosans, commonly used in the chemical and pharmaceutical industries. Students are guid...
Alterações ultraestruturais em larvas de Aedes aegypti submetidas ao diterpeno ...
Valotto,Cleyde Ferreira Barreto; Silva,Heloisa Helena Garcia da; Cavasin,Gláucia; Geris,Regina; Rodrigues Filho,Edson; Silva,Ionizete Garcia daINTRODUÇÃO: Dengue é um importante problema de saúde pública, em vários países, e tem como principal vetor o Aedes aegypti, mosquito mais adaptado às áreas urbanizadas. Apresenta-se, pela primeira vez, as alterações ultraestruturais em larvas de 3º estádio, desse mosquito, causadas pelos larvicidas naturais, um diterpeno labdano, extraído de Copaifera reticulata, e uma fração rica em taninos catéquicos, extraíd...
Larvicidal activity of oil-resin fractions from the Brazilian medicinal plant C...
Silva,Heloísa Helena Garcia da; Geris,Regina; Rodrigues Filho,Edson; Rocha,Cleonice; Silva,Ionizete Garcia daOil-resin fractions from Copaifera reticulata Ducke (Leguminosae-Caesalpinoideae) were evaluated for larvicidal activity on third larval instars of Aedes aegypti, in searching for alternative control methods for this mosquito. The bioactive fractions were chemically monitored by thin-layer chromatography, ¹H and 13C nuclear magnetic resonance and mass spectrometry. Bioassays were performed using five repetition...
Biodiesel de soja: reação de transesterificação para aulas práticas de química ...
Geris,Regina; Santos,Nádia Alessandra Carmo dos; Amaral,Bruno Andrade; Maia,Isabelle de Souza; Castro,Vinicius Dourado; Carvalho,José Roque MotaThe transesterification procedure of triacylglycerides from soybean oil (in natura and waste oil) to give biodiesel was adapted to semi-micro laboratory scale as an additional experimental technique of nucleophilic acyl substitution for undergraduate courses in Chemistry and related areas.