ABSTRACT
Chemical investigation of Croton pullei (Euphorbiaceae) collected in the Brazilian Amazon region was revisited. The chemical composition of the essential oils of leaves and stems was analyzed by GC/MS. It was found that both the oils comprise mainly terpenes, among which linalool was the major one (24.90 and 39.72%, respectively). Phytochemical investigation of the stem methanol extract led to the isolation of a new natural product from the glutarimide alkaloid group named N-[2,6-dioxo-1-(2-phenylethyl)-3-piperidinyl]-acetamide, confirming that C. pullei is a rich source of this class of alkaloids. The hexane and methanol extracts of the stems of C. pullei showed moderate antibacterial and antifungal activity and the highest inhibition was observed when the methanol extract was tested against Staphylococcus aureus CCMB 262 and CCMB 263.
Subject(s)
Alkaloids/chemistry , Alkaloids/pharmacology , Anti-Infective Agents/chemistry , Anti-Infective Agents/pharmacology , Croton/chemistry , Piperidones/chemistry , Volatile Organic Compounds/chemistry , Microbial Sensitivity Tests , Molecular Structure , Nuclear Magnetic Resonance, Biomolecular , Parasitic Sensitivity Tests , Plant Extracts/chemistry , Plant Leaves/chemistry , Plant Stems/chemistryABSTRACT
Essential oils from leaves and thin branches of Piper reticulatum and P. crassinervium collected in the north region of Brazil, were obtained by steam distillation and analyzed by GC/MS. The oil of P. reticulatum was dominated by -elemene (24.6%) and - caryophyllene (16.7%). The major compounds identified in the oil of P. crassinervium were - caryophyllene (17.7%), -elemene (14.4%) and b-elemene (10.9%).
Os óleos essenciais das folhas e galhos finos de Piper reticulatum e de P. crassinervium, coletados na região norte do Brasil, foram obtidos por arraste à vapor e analisados através de GC/MS. O óleo de P. reticulatum é constituido principalmente por -elemeno (24,6%) e -cariofileno (16,7%). Os principais compostos identificados no óleo de P. crassinervium foram-cariofileno (17,7%), -elemeno (14,4%) e -elemeno (10,9%).
ABSTRACT
The essential oils from leaves and thin branches of Piper amapense, Piper ducket and Piper bartlingianum were analysed by GC/MS and all volatile compounds were identified as sesquiterpenes. The main constitutents identified in the oil of P. amapense were trans-caryophyllene (25.0%), caryophyllene oxide (17.0%) and -selinene (15.0%). The oil of P. duckei was dominated by trans-caryophyllene (23.5%), caryophyllene oxide (18.4%), -eudesmol (9.4%) and a-eudesmol (9.1%). The major components found in the oil of P. bartlingianum were x-cadinol (11.2%), p-elemene (10.5%), -muurolol (9.4%), (E)-nerolidol (9.0%).
Os óleos essenciais obtidos das folhas e galhos finos de Piper amapense, Piper duckei e Piper bartlingianum foram analisados por GC/MS. Os óleos dessas espécies são constituídos na sua totalidade por sesquiterpenos. Os principais constituintes identificados no óleo de P. amapense foram trans-cariofileno (25,0%), óxido de cariofileno (17,0%) e -selineno (15,0%). O óleo de P. duckei foi dominado por trans-cariofileno (23,5%), óxido de cariofileno (18,4%), -eudesmol (9,4%) e -eudesmol (9,1%). Os mais importantes componentes encontrados em P. bartlingianum foram -cadinol (11,2%), -elemene (10,5%), -muurolol (9,4%), (E)-nerolidol (9,0%).
ABSTRACT
From the bark of Guarea carinata was isolated as main constituent a diacetilated triterpen (I) of protolimonoids type, derived from apo-tirucalol, that showed antifeedant activity in biological control of Urbanus acawoios(Lepidoptera,Hesperiidae).
Do cerne de Guarea carinata foi isolado como principal constituinte um triterpeno di-acetilado (I). do grupo dos protolimonóides, derivado do apo-tirucalol e que mostrou atividade no controle biológico das larvas de Urbanus acawoioa(WILLIAMS, R. C, 1926) (Lepidoptera Hesperiidac).
ABSTRACT
In this paper we related the identification and isolation of stearic, linolenic and palmitic acids and the isolation and structural determination of the 7-desacetoxy-7-hidroxyazadirone present in the hexan extract of the fruits of Guarea trichilioides. From the chloroform extrat of steam bark were isolated and identificated the antraquinones: chrysophanol and physcion.
Da casca da madeira de Guarea trichilioides foram isoladas e identificadas através de métodos espectrométricos as antraquinonas crisofanol e fisciona e das sementes o limonóide 7-desacetoxi-7-hidroxiazadirona. Da fração lipofílica das sementes foram ainda identificados por co-injeçao de padrões, através de cromatografia gasosa os ácidos esteárico, palmítico e linolênico.
