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Doctoral Thesis
DOI
https://doi.org/10.11606/T.46.2013.tde-06062013-100143
Document
Author
Full name
Giovana Cássia de Freitas Lemeszenski
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Kato, Massuo Jorge (President)
Bazito, Reinaldo Camino
Cruz, Frederico Guare
Pinto, Angelo da Cunha
Vieira, Paulo Cezar
Title in Portuguese
Protoflavonoides e meroterpenos de espécies de Piper
Keywords in Portuguese
Meroterpenos
Metabolôma
Piper
Piperaceae
Produtos naturais
Protoflavonoides
Abstract in Portuguese
As espécies da família Piperaceae, Piper bowiei, P. caldense, P. carniconnectivum e P. permucronatum apresentam uma característica morfológica em comum que são os frutos pendentes e globosos. Assim, seus extratos brutos foram submetidos às análises de espectrometria de massas e ressonância magnética nuclear e os espectros obtidos submetidos às análises quimiométricas por PCA (análise de componentes principais) e HCA (análise por agrupamento hierárquico) a fim de obter uma diferenciação entre as espécies ou observar suas possíveis similaridades.Os resultados obtidos em uma análise preliminar estimularam-nos a realizar o estudo fitoquímico em busca de seus constituintes majoritários. Foram isoladas e identificadas treze substâncias, sendo quatro meroterpenos e nove flavonoides, dos quais seis são descritos pela primeira vez. Ensaios de atividade antifúngica e antitumoral foram realizados levando em consideração relatos da literatura de substâncias com estruturas similares.
Title in English
Protoflavonoids and meroterpenes from Piper species
Keywords in English
Meroterpenes
Metabolome
Natural products
Piper
Piperaceae
Protoflavonoids
Abstract in English
The Piperaceae species Piper bowiei, P. caldense, P. carniconnectivum and P. permucronatum have pendant fruits as common morphological characteristics. Thus, their extracts were analyzed by mass spectrometry and nuclear magnetic resonance and submitted to chemometric analysis by PCA (principal component analysis) and HCA (hierarchical cluster analysis) in order to get a differentiation between species and to observe their possible similarities. Based on the results obtained in a preliminary analysis the phytochemical studies were carried out on their crude extracts in order to identify their major constituents. The study allowed the identification of thirteen compounds, being four meroterpenes and nine flavonoids, six of which were described for the first time. Biological activity assays were performed taking into account the potential activities reported for similar compounds.
 
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Publishing Date
2013-07-05
 
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