engleski

Policosanol variation in olive oil as a result of variety, ripening, and storage

Despite their importance as bioactive compounds and authentication parameters in olive oil, the response of policosanol aliphatic alcohols to even the most influential sources of variability is practically unknown. To investigate policosanol variation in olive oil as a result of variety, ripening, and oil storage temperature, 36 samples were subjected to gas chromatographic (GC-FID) and mass spectrometric (GC-MS) analysis, and results were processed by univariate (ANOVA) and multivariate (SLDA) statistics. The concentration (mg/100 g) and relative amount (%) of pentacosanol accounted for the most variation due to variety. The largest influence of ripening was observed for pentacosanol (%) and docosanol (%). Docosanol, tricosanol, and tetracosanol amounts mostly increased during ripening, whereas those of pentacosanol, hexacosanol, heptacosanol, and octacosanol decreased in Črna and Rosinjola oils, whereas Buža showed different patterns in some cases. Variations as a result of storage were lower and inconsistent. Results suggest that the investigated olive oils retained the bulk of their health beneficial features of policosanol origin throughout shelf-life. Relatively successful differentiation of oils achieved by multivariate models pointed to the potential use of policosanol alcohols as chemical indicators of varietal origin which are independent on ripening degree, and vice versa, applicable both for fresh and stored oils.

Olive oil; Policosanol; Ripening degree; Storage; Variety

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