Now showing items 1-10 of 200
químicos das folhas de Qualea grandiflora: atribuição dos dados de RMN de dois flavonóides glicosilados acilados diastereoisoméricos
(Química Nova, 2008-01-01) [Artigo]
Phytochemical investigation from leaves of the Qualea grandiflora (Vochysiaceae) resulted in the isolation and identification of kaempferol-3-O-α-L-(4-E-p-coumaroyl)-rhamnoside, kaempferol-3-O-α-L-(4-Z-p-coumaroyl)-rhamnoside, ...
Synthesis and evaluation of novel prenylated chalcone derivatives as anti-leishmanial and anti-trypanosomal compounds
(Bioorganic and Medicinal Chemistry Letters, 2015-08-15) [Artigo]
Chalcones form a class of compounds that belong to the flavonoid family and are widely distributed in plants. Their simple structure and the ease of preparation make chalcones attractive scaffolds for the synthesis of a ...
HPLC-DAD method for metabolic fingerprinting of the phenotyping of sugarcane genotypes
(Analytical Methods, 2014-01-01) [Artigo]
Metabolite profiling techniques play an important role in the phenotyping and diagnostic analysis of plants. The complexity of the plant metabolome makes the application of a single extraction and analytical method to all ...
Essential oils from leaves of cryptocarya spp from the atlantic rain forest
(Química Nova, 2008-01-01) [Artigo]
The essential oils from leaves of four Cryptocarya spp endemic in the Brazilian Atlantic rain forest were obtained by hydrodistillation and shown by GC-MS analysis to contain mono and sesquiterpenes. The major components ...
Antifungal activity of flavonoids from Heteropterys byrsonimifolia and a commercial source against Aspergillus ochraceus: In silico interactions of these compounds with a protein kinase
(Crop Protection, 2014-08-01) [Artigo]
To contribute to the development of new methods to reduce the contamination of coffee beans with Aspergillus ochraceus and ochratoxin A, a toxin produced by this fungus, the present work initially aimed to select plant ...
Improvement of Pro-Oxidant Capacity of Protocatechuic Acid by Esterification
(Plos One, 2014-10-23) [Artigo]
Pro-oxidant effects of phenolic compounds are usually correlated to the one-electron redox potential of the phenoxyl radicals. Here we demonstrated that, besides their oxidizability, hydrophobicity can also be a decisive ...
Antimalarial activity of piperidine alkaloids from Senna spectabilis and semisynthetic derivatives
(Journal of the Brazilian Chemical Society, 2014-10-01) [Artigo]
In our continuing work looking for new anti-infective lead compounds from Brazilian biomes, the two known piperidine alkaloids ( - )-cassine and ( - )-spectaline were isolated from the flowers of Senna spectabilis (syn. ...
A simple and rapid screening method for sulfonamides in honey using a flow injection system coupled to a liquid waveguide capillary cell
(Talanta, 2014-04-01) [Artigo]
A rapid and simple screening method was developed for the determination of sulfonamides in honey samples by flow injection analysis (FIA) coupled to a liquid waveguide capillary cell. The proposed method is based on the ...
In Vitro Antibacterial Activity of Prenylated Guanidine Alkaloids from Pterogyne nitens and Synthetic Analogues
(Journal Of Natural Products, 2014-08-01) [Artigo]
The present investigation deals with the antibiotic activity of eight natural guanidine alkaloids and two synthetic analogues against a variety of clinically relevant methicillin-resistant Staphylococcus aureus strains. ...
Chemical and antifungal investigations of six Lippia species (Verbenaceae) from Brazil
(Planta Medica, 2012-08-01) [Resumo]