EFFECT OF STONING ON CHEMICAL COMPOSITION OF OLIVE OILS FROM THREE TUNISIAN OLIVE CULTIVARS (OLEA EUROPAEA L.)

S. Bornaz, A. Sahli, M. Maaoui, S. Sifi, M. Aïachi
An experimental investigation was carried out to evaluate the effect of stoning on yield and composition of virgin olive oil derived from three olive cultivars (‘Chemlali’, ‘Chetoui’ and ‘Zalmati’) representing the main domesticated material used in Tunisia. The action of stone mill and the de-stoner in olive paste preparation was compared and their effects on quality of yielded oils were evaluated. Also, composition of pulp oil and stone oil were compared.
The oil yield of stoned olive decreased slightly but the effect of stoning depends on cultivar. In fact, ‘Chetoui’ appears as the most suitable cultivar to such treatment. On the other hand, stoning can improve the oxidative stability and the alcohols content of the extracted oils. In addition, stoning had no effect on the phenols content and on the acidic, triglyceridic and sterolic fractions.
The comparison between pulp and stone oils characteristics showed a richness of the stone oil in certain fatty acids (C18:2, C20:0 and C20:1) and in LLL triglyceride in addition to total sterols, total alcohols, carotenoids and chlorophylls oil contents. However, the composition of the stone in aliphatic alcohols, terpenic alcohols and erythrodiol+uvaol depends on cultivar. This rich composition in minor compounds makes the stone oil an important product which can be valorized in the chemical and pharmaceutical industries.
Bornaz, S., Sahli, A., Maaoui, M., Sifi, S. and Aïachi, M. (2012). EFFECT OF STONING ON CHEMICAL COMPOSITION OF OLIVE OILS FROM THREE TUNISIAN OLIVE CULTIVARS (OLEA EUROPAEA L.). Acta Hortic. 949, 495-504
DOI: 10.17660/ActaHortic.2012.949.73
https://doi.org/10.17660/ActaHortic.2012.949.73
olive oil, cultivar, stoning, stone, pulp, composition
English

Acta Horticulturae