Resina de Protium heptaphyllum: isolamento, caracterização estrutural e avaliação das propriedades térmicas

AUTOR(ES)

Vieira Júnior, Gerardo Magela, Souza, Cleide Maria Leite de, Chaves, Mariana Helena

FONTE

Química Nova

DATA DE PUBLICAÇÃO

2005-03

RESUMO

Three mixtures of triterpenes (maniladiol and breine; alpha and beta-amyrin; lupenone, alpha and beta-amyrinone) were isolated from Protium heptaphyllum March resin. The structural identification was based on NMR and mass spectrometry data. Lupenone, and alpha and beta-amyrinone were not reported before as constituents of this resin. The resin was submitted to methylation and acetylation reactions. The pure and derivatized resins and the mixtures (maniladiol and breine; alpha and beta-amyrin) were analyzed by TG and DSC. The TG curves revealed that the derivatization decreases the thermal stability of the resin. The DSC curves showed peaks that can be assigned to evaporation and phase transitions processes.

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