ROUSSEAUX Maria Cecilia
congresos y reuniones científicas
STEROL COMPOSITION OF OLIVE OIL IN RESPONSE TO TEMPERATURE MANIPULATION IN THE FIELD
HAMZE, L. M.; MISERERE, ANDREA; MOLINA, MARÍA SOL; SEARLES, PETER S.; ROUSSEAUX, M. CECILIA
Congreso; Olivebioteq. 6th International Conference on olive tree and olive products; 2018
Total olive oil sterol content and composition often vary between genotypes and environmental factors related toyear, latitude, and altitude. One environmental factor that can change greatly is temperature. Thus, the objective ofthis study was to analyze total sterol content and composition of oils from two olive cultivars (?Coratina? and?Arbequina?) grown under two temperature regimes. Open top chambers (OTC) were used in the field to provide anear-ambient temperature control (C) and an actively heated (4°C above the control, H) treatment during fruit growth.Other environmental factors were kept similar between the experimental groups. Oil was obtained by cold extraction,and sterol content and composition were determined using the IOOC standard method. Average total sterol contentfor both cultivars increased 16% in H compared to C. b-sitosterol, the most abundant sterol in olive oil, decreasedwith the temperature increase in both cultivars, while campesterol tended to increase in both cultivars. Furthermore,stigmasterol significantly increased in response to temperature in ?Coratina?, but not in ?Arbequina?. Consequently,the campesterol/stigmasterol ratio significantly decreased in response to temperature in ?Coratina?. No treatmentdifferences were observed for cholesterol and D7-stigmastenol. This study is a first attempt to understand the effectsof temperature on olive oil sterolic composition by direct temperature manipulation in the field. Direct temperaturemanipulation should improve our understanding of the variability in sterol content and composition betweenenvironments, and also understand some of the possible consequences of global warming on olive oil quality.