Flavonóides isolados do pólen coletado pela abelha Scaptotrigona bipunctata (canudo)

Pela Universidade Do Porto

Chemical basis for inter-colonial aggression in the stingless bee Scaptotrigona bipunctata (Hymenoptera: Apidae).

Inter-colonial aggression was tested using three colonies of Scaptotrigona bipunctata in a natural setting when their nests were moved and by artificial contact between individuals. Examination of the cuticular lipids of individuals from two colonies kept under identical conditions showed clear differences in their cuticular hydrocarbon profiles. The cuticular lipids were a mixture of hydrocarb...

Antibacterial synergic effect of honey from two stingless bees: Scaptotrigona bipunctata Lepeletier, 1836, and S. postica Latreille, 1807

Several studies have tested antimicrobial activity of combinations of honey and various substances. In this study, we tested a combination of two stingless bee honeys against various bacterial strains. In particular: the antibacterial activity of honeys produced by Scaptotrigona bipunctata (SB) and Scaptotrigona postica (SP) was evaluated against Gram-positive and Gram-negative bacterial strain...

New Ester and Furocoumarins from the Roots of Pituranthos tortuosus

Sete compostos foram isolados, a partir das frações solúveis em CHCl 3 , de raízes de Pituranthos tortuosos; adicionalmente manitol foi cristalizado a partir do extrato alcoólico. Usando diferentes técnicas espectroscópicas os compostos isolados foram identificados como bergaptana, graveolana, xanthotoxinona, isopimpinela, dimetoxi aesculetina, 3-O-β-glicopiranosil estigmasterol e também o novo...

Lanostane Triterpenes from the Fungus Pisolithus tinctorius

Um novo triterpeno, 3β,22ξ,23ξ-triidróxi-22ξ-acetóxi-24-metil-lanosta-8,24(28)-dieno-31-al, denominado pisosteral, e quatro triterpenos lanostanos conhecidos, 3β,22ξ,23ξ-triidróxi-22ξ-acetóxi24-metil-lanosta-8,24(28)-dieno (pisosterol), 3α,22ξ,23ξ-triidróxi-22ξ-acetóxi-24-metil-lanosta8,24(28)-dieno (3-epi-pisosterol), 3β,22ξ,23ξ-triidróxi-23ξ-acetóxi-24-metil-lanosta-8,24(28)-dieno e 3β,22ξ,23...