TITLE:
NMR-Metabolomic Study on Monocultivar and Blend Salento EVOOs including Some from Secular Olive Trees
AUTHORS:
Laura Del Coco, Sandra A. De Pascali, Francesco P. Fanizzi
KEYWORDS:
Cellina Di Nardò; Ogliarola Salentina; EVOOs; 1H NMR Spectroscopy; Multivariate Statistical Analysis, MVA; Principal Component Analysis, PCA; Orthogonal Partial Least Squares Discriminant Analysis (OPLS-DA)
JOURNAL NAME:
Food and Nutrition Sciences,
Vol.5 No.1,
January
15,
2014
ABSTRACT: The aim of the present work has been to characterize, by
NMR-based metabolic profiling, extravirgin olive oils (EVOOs) from a
subarea (Salento) of Apulia, leader EVOO producer among the Italian regions.
According to the European Union (EU) definition, Protected Designation of
Origin (PDO) products are mostly closely
linked to the concept of terroir due to the place
of origin, climate and local know-how. Moreover, the authenticity and traceability of several products
such as olive oils with specific geographical origin require to be preserved by
analytical methods. In this regard, about a hundred EVOO samples (monovarietal
and blend samples, cultivars Ogliarola Salentina and Cellina di Nardò, basis of
“Terra d’Otranto” PDO, campaign 2012-2013) were therefore analyzed by 1H
NMR spectroscopy and multivariate statistical analysis. Both unsupervised (PCA)
and supervised (OPLS-DA) statistical analyses allowed differentiation of monocultivar oils and blends characterization. Other features such
as the age of the trees (young, 100
years) could also be investigated. Cellina samples showed a higher content of
aldehydic and phenolic compounds, while Ogliarola samples were characterized by
NMR signals in the range of δH 6.5 - 5.6, which could be ascribed to higher carotenoids
content. Higher polyphenols and polyunsaturated fatty acid content were also
found in young over secular tree EVOOs.