Oxindole Alkaloids
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. CHEMICAL COMPOSITION VARIABILITY IN THE Uncaria tomentosa (cat’s claw) WILD POPULATION
Uncaria tomentosa (cat's claw) is a vine widely distributed throughout the South-American rainforest. Many studies investigating the chemical composition of cat's claw have focused on the pentacyclic (POA) and tetracyclic oxindole alkaloids (TOA), quinovic acid glycosides (QAG), and polyphenols (PPH). Nevertheless, it is still uncertain how environmental fac
Quím. Nova. Publicado em: 2015-03
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2. Cat's claw oxindole alkaloid isomerization induced by common extraction methods
Cat's claw oxindole alkaloids are prone to isomerization in aqueous solution. However, studies on their behavior in extraction processes are scarce. This paper addressed the issue by considering five commonly used extraction processes. Unlike dynamic maceration (DM) and ultrasound-assisted extraction, substantial isomerization was induced by static maceratio
Quím. Nova. Publicado em: 2013
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3. Obtenção e análise de frações enriquecidas de uncaria tomentosa (Willd) DC.
Uncaria tomentosa is a tropical liana native form Brazilian and Peruvian rain forests. The specie is recognized by its immune stimulant, anti-viral, anti- inflammatory and anti-cancer properties often attributed to the polyphenolic fraction and manly to the peculiar pentaciclic oxindole alkaloidal fraction. On the technological field, aiming the transformati
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2010
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4. Do isolamento à síntese da convolutamidina A
Convolutamydine A is a member of a family of oxindole alkaloids isolated from the Floridian marine bryozan Amathia convoluta in 8.6x10-6 % yield. This compound is interesting as it has been described in the literature to have significant pharmacological activity. When bioactive substances are isolated in low yields, such as in the case of convolutamydine A,
Química Nova. Publicado em: 2008
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5. Determinação por RMN das configurações relativas e conformações de alcalóides oxindólicos isolados de Uncaria guianensis
Phytochemical studies with leaves of Uncaria guianensis resulted in the isolation of the oxindole alkaloids isomitraphylline (1), 3-isoajmalicine (2) mitraphylline (3), and isomitraphylinic acid (4). Structural assignments of these alkaloids, including relative configurations and conformations, were performed through spectral data and physical properties. 1D
Química Nova. Publicado em: 2004-12