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Phenylalanine ammonia-lyase, polyphenol oxidase, and phenol concentration in fruits of Olea europaea L. cv. Picual, Verdial, Arbequina, and Frantoio during ripening.

Authors
  • Ortega-García, Francisca
  • Peragón, Juan
Type
Published Article
Journal
Journal of Agricultural and Food Chemistry
Publisher
American Chemical Society
Publication Date
Nov 11, 2009
Volume
57
Issue
21
Pages
10331–10340
Identifiers
DOI: 10.1021/jf901471c
PMID: 19813730
Source
Medline
License
Unknown

Abstract

The kinetics and protein-expression level of phenylalanine ammonia-lyase (PAL) and polyphenol oxidase (PPO) in fruits of olive trees (Olea europaea) cv. Picual, Verdial, Arbequina, and Frantoio have been studied in relation to the concentration of total phenolic compounds, oleuropein, hydroxytyrosol, and tyrosol during fruit ripening. Frantoio was the variety that showed the highest total phenol concentration, the highest PAL activity, the lowest PPO activity, and the lowest protein levels. In contrast, Verdial was the variety that showed the lowest total phenol concentration, the least PAL activity, the greatest PPO activity, and the highest protein levels. Arbequina and Picual showed intermediate levels. These results suggest the existence of a coordinated response between PAL, PPO, and the concentration of total phenols over ripening in the four varieties. The concentration of total and specific phenols differed between varieties and specifically changed over ripening.

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