HPLC profile and evolution during storage of triglycerides and diglycerides in virgin olive oils

High-performance liquid chromatography has been used for determining the triglyceridice and diglyceridice composition of olive oils from main, minor and neglected Sicilians cultivars. The HPLC analysis has allowed the identification and the quantification of 16 triglycerides. Among these, OOO, POO+SOL, OOL and POL, have shown a content higher than 84% of the total area of peaks in the chromatographic profile. Dioleine (OO) and oleopalmitine (OP) resulted the most representative diglycerides. Analyses have been made in January 2007 and repeated after six months, submitting samples to a simulation of shelf life, to verify as the storage conditions may influence the hydrolitic processes of tri…

Presenza di micotossine in oli extra-vergini d’oliva e olive da mensa

La presenza di aflatossine e ocratossina A è stata ricercata in 28 oli extra vergini di oliva siciliani, delle annate 2002 e 2003, di produzione tradizionale o da agricoltura biologica, ed in 45 campioni di olive da mensa di diverse tipologie. Il 54% dei campioni di olio e il 33% dei campioni di olive sono risultati esenti da micotossine. Negli altri, i livelli di contaminazione oscillavano tra 6 e 40 ng/kg negli oli e tra 31 e 1.518 ng/kg nelle olive, quelli dell’ocratossina A fra 52 e 244 ng/kg negli oli e fra 101 e 8.391 ng/kg nelle olive. Un solo campione di olio e sei di olive erano contaminati sia da aflatossina B1, sia da ocratossina A. The occurrence of aflatoxins and ochratoxin A w…

Fatty acids, sterols and antioxidant compounds of minor and neglected cultivar of Sicilian virgin olive oils

Acidic and sterol composition, pigment fraction and antioxidant compounds (tocopherols, total phenols and polar phenols) from eight monovarietal Sicilian olive oil samples, analyzed during the crop seasons from 2003/2004 to 2005/2006, are reported. Cultivars were divided, according to their diffusion, in main, minor and neglected cultivars. Encouraging data were observed for minor and neglected cultivars, for some revaluation in regard to their relevance, because they showed the highest content in tocopherols, in total phenols and polar phenols compared with main cultivars.

Contaminanti chimici e microbiologici nel tonno

HPLC PROFILE AND EVOLUTION DURING STORAGE OF TRIGLYCERIDES AND DIGLYCERIDES IN VIRGIN OLIVE OILS

Acidic and sterol composition, pigment fraction and antioxidant compounds (tocopherols, total phenols and polar phenols) from eight monovarietal Sicilian olive oil samples, analyzed during the crop seasons from 2003/2004 to 2005/2006, are reported. Cultivars were divided, according to their diffusion, in main, minor and neglected cultivars. Encouraging data were observed for minor and neglected cultivars, for some revaluation in regard to their relevance, because they showed the highest content in tocopherols, in total phenols and polar phenols compared with main cultivars.