Recent advances in chemical ecology

Terpenos com atividade inseticida: uma alternativa para o controle químico de insetos

“…Foram isoladas nove substâncias (81-89) (Figura 10), a maioria com esqueleto taxano, sendo que a 10-desacetilbacatina III (81) e V (82) mostraram-se fortemente ativas, seguidas pelos derivados da taxicina 83 e 84, moderadamente ativos. Os compostos fenólicos 88 e 89 foram os menos ativos 37,40 .…”

Inhibition ofNO2,PGE2, TNF-α,andiNOS EXpression byShorea robus

“…However, the HPLC profile of Fraction 6 revealed four major compounds. Earlier reports revealed that gum resin of S. robusta contain ursolic acid and α -amyrenone [32, 33], bark contains ursonic acid and oleanane [34], seed contains hopeaphenol, leucoanthocyanidin, and 3,7-dihydroxy-8-methoxyflavone7- O - α -l-rhamnopyranosyl-(1→4)- α -l-rhamnopyranosyl-(1→6)- β -d-glucopy-ranoside [35], while heartwood contains germacrene-D [10]. The isolation of β -amyrin, friedelin, β -sitosterol, pheophytin- α , and dihydroxyisoflavone from mature leaves was also reported [36].…”

Flavonoids and a Naphthopyranone from Eriocaulon ligulatum and Their Mutagenic Activity

“…[18][19][20] From the evolutionary point of view, it is considered that Leiothrix and Syngonanthus may have originated from Paepalanthus, in a more advanced position than Eriocaulon, 21) since the substitution of flavonols with flavones, 3) is a well established condition. 22) Naphthopyranones are a relatively rare class of natural compounds and the presence of this class of compounds in E. ligulatum suggests an approximation between Eriocaulon and Paepalanthus, whereas the presence of the flavones align Eriocaulon in a less advanced sister group relative to the Leiothrix/Syngonanthus clade. Our results reinforce the cladistic analysis method based on morphological and cytological characteristics reported by Giulietti et al 23) Short-term tests that detect genetic damage can afford the information needed to evaluate the carcinogenic risks of chemicals to humans.…”