The phytochemical investigation of the roots of Piptadenia rigida Benth., Fabaceae, known as "angico", afforded sitosterol, lupeol, betuline, the chalcone isoliquiritigenin, the flavonoids, 7,4'-dihydroxyflavone, 7,3',4'-trihydroxyflavone, 7,8,3',4'-tetrahydroxyflavanone, 4-hydroxy-3,5-dimethoxybenzaldehyde and methyl-3,4-dihydroxy-benzoate. Both flavones were also isolated from the branches of this plant. Five derivatives of the aldehyde were obtained by diazomethane treatment. The structures of compounds were identified by IR, NMR and mass spectral data analysis of natural compounds and some derivatives, and by comparison with literature data.

O estudo fitoquímico de galhos de Piptadenia gonoacantha (Mart.) J.F. Macbr. (Leguminosae-Mimosoideae), comumente conhecida como "pau jacaré", forneceu sitosterol, estigmasterol, o éster N-benzoilfenilalaninato de 2-N-benzoil-3-fenilpropila, conhecido como asperfenamato, 3-O-β-D-glicopiranosil-sitosterol, além de três flavonóides, apigenina (5,7,4'-triidroxiflavona), apigenina-5-O-metil éter e 7,4'-dihidroxi-3' , 5-dimetoxiflavona. Das folhas isolaram-se galato de metila e dois flavonóides, 8-C-glicopiranosil-5,7,4' -trihidroxiflavona e 6-C-glicopiranosil-5,7,4'-trihidroxiflavona, conhecidas como vitexina e isovitexina. Das cascas desta planta isolaram-se uma mistura de sitosterol, campesterol e estigmasterol; mistura de cicloartenona, cicloartan-25,26-en-3-ona e 24-metileno-cicloartanona, além dos triterpenos, 24-metilenocicloartenol, fridelina, lupeol e lupenona. As estruturas foram estabelecidas através de análise de espectros de IV, RMN ¹H e 13C e massas, além de análise com CG-EM para identificar os componentes das misturas de cicloartanos e esteróides. O éster conhecido como asperfenamato, os flavonóides e os cicloartanos estão sendo registrados pela primeira vez em Piptadenia.

The phytochemical investigation of Piptadenia gonoacantha (Mart.) J.F. Macbr. (Leguminosae-Mimosoideae), commonly known as "pau jacaré" (alligator stick), afforded sitosterol, campesterol, stigmasterol, the N-benzoylphenylalanine-2-benzoylamide-3-phenylpropyl ester, known as asperphenamate, sitosterol-3-O-β-D-glucopyranoside, besides three flavonoids, apigenin, 5-O-methylapigenin and 7,4'-dihydroxy-3',5-dimethoxyflavone from its branches. From its leaves, the methyl gallate and two flavonoids, vitexin and isovitexin, were isolated. From its bark, a mixture of sitosterol, campesterol, and stigmasterol, besides a mixture of cycloartenone, cycloartan-25-en-3-one, and 24-methylene-cycloartenone, and the pure triterpenes 24-methylenecycloartanol, friedelin, lupeol and lupenone, were isolated. Their structures were established on the basis of spectral analysis, comparison with literature data and GC-MS analysis of the mixtures. The ester, flavonoids and the cycloartanes are been identified for first time in the genus Piptadenia.

Na Mata Atlântica área correspondente ao espaço geopolítico do Parque Estadual da Pedra Branca, Rio de Janeiro, Brasil, entre outubro de 2005 e outubro de 2007, 160 pequenos mamíferos foram capturados, sendo 64 pequenos roedores e 96 marsupiais. Nestes hospedeiros, foram coletadas seis espécies de pulgas relacionadas a três famílias (Ctenophthalmidae, Rhopalopsyllidae e Pulicidae), totalizando 162 espécimes. Adoratopsylla (Tritopsylla) intermedia intermedia foi a espécie mais freqüente, seguida por Polygenis (Polygenis) occidentalis occidentalis. Novos hospedeiros foram registrados, Philander frenatus e Micoureus paraguayanus para Adoratopsylla (Tritopsylla) intermedia intermedia, bem como a ocorrência de algumas espécies de Siphonaptera encontrados em novo espaço geopolítico, P. o. occidentalis e no município do Rio de Janeiro.

In an region of Atlantic Rainforest corresponding to the geopolitical area of the Pedra Branca State Park, Rio de Janeiro, southeastern Brazil, 160 small mammals were captured, of which 64 rodents and 96 marsupials from October 2005 to October 2007. There were collected in these hosts six flea species from three families (Ctenophthalmidae, Rhopalopsyllidae and Pulicidae), totalizing 162 specimens. Adoratopsylla (Tritopsylla) intermedia intermedia was the most common species found, followed by Polygenis (Polygenis) occidentalis occidentalis. Philander frenatus and Micoureus paraguayanus were reported as new hosts to Adoratopsylla (Tritopsylla) intermedia intermedia and P. o. occidentalis was reported for the first time in the city of Rio de Janeiro.