tailieunhanh - Olive Oil Constituents Quality Health Properties and Bioconversions Part 2

Tham khảo tài liệu 'olive oil constituents quality health properties and bioconversions part 2', khoa học tự nhiên, công nghệ sinh học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 24 Olive Oil - Constituents Quality Health Properties and Bioconversions In a recent study concerning the behaviour of super-intensive Spanish and Greek olive cultivars grown in northern Tunisia Allalout et al. 2011 found significant differences between oils they consider the majority of the studied analytical parameters to be deeply influenced by the cultivar-environment interaction. It seems there is an effect of genotype-environment interaction responsible for olive oils characteristics. Agronomic factors Irrigation a practice that has been adequately studied seems to produce a decrease in the oxidative stability of olive oil volatiles due to a simultaneous reduction in oleic acid and phenolic compounds contents Tovar et al. 2002 . According to Servili et al. 2007 the olive tree water status has a remarkable effect on the concentration of volatile compounds such as the C6-saturated and unsaturated aldehydes alcohols and esters. Put simply deficit irrigation of olive trees appears to be beneficial not only due to its well-known positive effects on water use efficiency but also by optimizing olive oil volatile quality. Baccouri et al. 2008 reported an enhancement of the whole aroma concentration of Chetouil oils obtained from trees under irrigation conditions when compared to similar ones from non-irrigated trees. The effect of agronomic practices in oil quality is still controversial data from Gutierrez et al. 1999 supports the hypothesis that organic olive oils have better intrinsic qualities than conventional ones. These olive oils usually present lower acidity and peroxide index higher rancimat induction time higher concentrations of tocopherols polyphenols o-diphenols and oleic acid. However this work was carried out during 1 year with one olive cultivar only and results can not be generalized. Ninfali et al. 2008 in a 3-year study comparing organic versus conventional practice did not observe any consistent effect on virgin olive oil quality. Genotype .

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