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Extração por fluido supercrítico de alguns inseticidas carbamatos em amostras de batata, com determinação por HPLC/fluorescência e confirmação por HPLC/espectrometria de massas
(Química Nova, 2002-05-01) [Artigo]
Six supercritical fluid extraction (SFE) methods were tested, by varying the following operational parameters: CO2 pressure, time and temperature of extraction, type and proportion of static modifier, and Hydromatrix®/sample ...
Toxicity of extracts and isobutyl amides from Piper tuberculatum: potent compounds with potential for the control of the velvetbean caterpillar, Anticarsia gemmatalis
(Pest Management Science, 2007-04-01) [Artigo]
The isobutyl amides pellitorine (compound 1) and 4,5-dihydropiperlonguminine (compound 2) were extracted from the seeds of Piper tuberculatum Jacq. (Piperaceae) in yields of 6.10 and 4.45% respectively. The acute toxicities ...
Extraction and clean-up procedure for analysis of organochlorine pesticide residues in ethoxylated lanolin
(Farmaco, 2000-09-01) [Artigo]
In the present study an evaluation was made of a method for the determination of organochlorine pesticide residues in ethoxylated lanolin. Samples were homogenized with Celite, transferred to chromatographic columns, ...
Plant derived alkaloid (-)-cassine induces anti-inflammatory and anti-hyperalgesics effects in both acute and chronic inflammatory and neuropathic pain models
(Neuropharmacology, 2012-02-01) [Artigo]
Natural products have been revealed as relevant sources of therapeutic agents including those for the management of pain states. In this study, the anti-nociceptive and anti-inflammatory effects of (-)-cassine, isolated ...
Rapid method for the determination of thiabendazole and imazalil residues in orange by capillary column gas chromatography
(HRC Journal of High Resolution Chromatography, 1999-05-18) [Artigo]
Coumarins and terpenoids from Dorstenia asaroides Gardn. in Hook
(Revista de Ciencias Farmaceuticas, 1997-01-01) [Artigo]
Phytochemical investigation of rhizomes and leaves of Dorstenia asaroides Gardn. in Hook. (Moraceae) afforded the furocoumarins psoralen and bergapten, the triterpenes α-amyrin, α-amyrin acetate, β-amyrin acetate, lupeyl ...
Antiproliferative effect of Pterogyne nitens on melanoma cells
(Revista de Ciências Farmacêuticas Básica e Aplicada, 2007) [Artigo]
As part of our program of bioprospecting for novel antitumor drug prototypes, twenty extracts and fractions obtained from Pterogyne nitens Tul. (Fabaceae, Caesalpinioideae) were screened for antiproliferative activity ...
Gas-chromatographic determination of deltamethrin in crops
(Fresenius' Journal of Analytical Chemistry, 1998-12-01) [Artigo]
A rapid and economical method is described for the determination of deltamethrin in wheat, rice, peanuts and corn. It is based on simultaneous extraction and clean-up on a column packed with alumina and silica gel using ...
Ionic medium effects on equilibrium constants .1. Proton, copper(II), cadmium(II), lead(II) and acetate activity coefficients in aqueous solution
(Talanta, 1996-10-01) [Artigo]
The molar single ion activity coefficients associated with hydrogen, copper(II), cadmium(II) and lead(II) ions were determined at 25 degrees C and ionic strengths between 0.100 and 3.00 M (NaClO4), whereas for acetate the ...
Intraspecific variability of dihydrochalcone, chromenes and benzoic acid derivatives in leaves of Piper aduncum L. (Piperaceae)
(African Journal of Biotechnology, 2009-05-18) [Artigo]
Chemical analysis carried out in leaves of 18 specimens of Piper aduncum L. (Piperaceae) occurring at Ripasa Reserve, Araraquara, SP, Brazil indicated two distinct populations when investigated over a period of 14 months ...