Resina de Protium heptaphyllum: isolamento, caracterização estrutural e avaliação das propriedades térmicas The Protium heptaphyllum resin: isolation, structural characterization and evaluation of thermal properties

• Main Authors: Gerardo Magela Vieira Júnior, Cleide Maria Leite de Souza, Mariana Helena Chaves
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2005-03-01
• Series: Química Nova
• Subjects: Burseraceae; triterpenes; thermal analysis
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422005000200003

<abstract language="eng">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.