Title: Phenolic Compounds Profile of Cornicabra Virgin Olive Oil
Abstract: This study presents the phenolic compounds profile of commercial Cornicabra virgin olive oils from five successive crop seasons (1995/1996 to 1999/2000; n = 97), determined by solid phase extraction reversed phase high-performance liquid chromatography (SPE RP-HPLC), and its relationship with oxidative stability, processing conditions, and a preliminary study on variety classification. The median of total phenols content was 38 ppm (as syringic acid), although a wide range was observed, from 11 to 76 ppm. The main phenols found were the dialdehydic form of elenolic acid linked to tyrosol (p-HPEA-EDA; 9 ± 7 ppm, as median and interquartile range), oleuropein aglycon (8 ± 6 ppm), and the dialdehydic form of elenolic acid linked to hydroxytyrosol (3,4-DHPEA-EDA; 5 ± 8 ppm). In many cases the correlation with oxidative stability was higher when the sum of the dialdehydic form of elenolic acid linked to hydroxytyrosol (3,4-DHPEA-EDA) and oleuropein aglycon (r 2 = 0.91−0.96) or the sum of these two and hydroxytyrosol (r 2 = 0.90−0.97) was considered than was observed with HPLC total phenols (r 2= 0.91−0.95) and especially with colorimetric determination of total polyphenols and o-diphenols (r 2 = 0.77−0.95 and 0.78−0.92, respectively). 3,4-DHPEA-EDA, p-HPEA-EDA, the aglycons of oleuropein and ligstroside, and HPLC total phenols content presented highly significant differences (p = 0.001−0.010) with respect to the dual- and triple-phase extraction systems used, whereas colorimetric total polyphenols content did not (p = 0.348) and o-diphenols showed a much lower significant difference (p = 0.031). The five variables that most satisfactorily classified the principal commercial Spanish virgin olive oil varieties were 1-acetoxypinoresinol, 4-(acetoxyethyl)-1,2-dihydroxybenzene (3,4-DHPEA-AC), ligstroside aglycon, p-HPEA-EDA, and RT 43.3 contents. Keywords: Phenols; Cornicabra; virgin olive oil; oxidative stability; extraction system; variety authenticity
Publication Year: 2002
Publication Date: 2002-10-04
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
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Cited By Count: 192
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