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Transient Expression in Nicotiana Benthamiana Leaves for Triterpene Production at a Preparative Scale
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Pentacyclic triterpenoids from olive fruit and leaf.

Angeles Guinda1, Mirela Rada, Teresa Delgado

  • 1Instituto de la Grasa-CSIC, Av. Padre Garcia Tejero, 4, 41012 Seville, Spain.

Journal of Agricultural and Food Chemistry
|August 18, 2010
PubMed
Summary

Olive leaves are rich in oleanolic acid, while fruits contain less. Triterpenoid levels in olive leaves and fruits vary with cultivar and ripening stage, primarily due to genetic factors.

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Area of Science:

  • Agricultural Science
  • Phytochemistry
  • Plant Physiology

Background:

  • Pentacyclic triterpenes are bioactive compounds found in plants.
  • Olive trees (Olea europaea) are a significant agricultural crop with potential health benefits.
  • Understanding triterpenoid profiles in different olive parts and cultivars is crucial for agricultural and pharmaceutical applications.

Purpose of the Study:

  • To establish a novel procedure for the extraction and analysis of pentacyclic triterpenes.
  • To investigate the presence and concentration of triterpenes in the leaves and fruits of three Spanish olive cultivars.
  • To determine how triterpenoid profiles change during leaf ontogeny and fruit ripening.

Main Methods:

  • Development of a new extraction and analysis method for pentacyclic triterpenes.
  • Analysis of olive leaves and fruits from 'Picual', 'Hojiblanca', and 'Arbequina' cultivars.
  • Quantification of triterpenoids including oleanolic acid, maslinic acid, ursolic acid, erythrodiol, and uvaol.

Main Results:

  • Olive leaves contain high levels of oleanolic acid (3.0-3.5% dry weight), maslinic acid, and minor amounts of ursolic acid, erythrodiol, and uvaol.
  • Triterpenoid abundance and profile in leaves change with leaf development (ontogeny).
  • Fruits contain triterpenes in the epicarp at concentrations 30-fold lower than leaves, with maslinic acid as the main compound, decreasing during ripening.

Conclusions:

  • Triterpenoid composition in olive leaves and fruits differs significantly between cultivars.
  • Genetic factors are the primary drivers of observed differences in triterpenoid content among cultivars.
  • The study provides valuable data on the distribution and variation of olive triterpenes, relevant for breeding and product development.