بهينه‌سازي فرايند استخراج روغن زيتون به منظور افزايش راندمان و بهبود خصوصيات كيفي (روغن‌)

Optimization of Olive Oil Extraction to Enhance Efficiency and Quality

Olive oil is one of the oldest known vegetable oils, ranking sixth in world production. Since it is extracted from fresh fruit and used without aging, the conditions of oil production are very important. During the extraction of virgin olive oil, the milling and malaxation steps are vital for increasing oil yield and quality. In this study, the effect of milling (single Of double), temperature of malaxation (25. 35, 45, 60°C) and duration of malaxation (15, 30, 45, 60min) on yield and quality (acidity, peroxide index, color, carbonyl values) of virgin olive oils (cultivar Roghani) were investigated. The results showed that double milling increased oil yield, but that the type of milling had no significant effect on oil quality. Increasing temperature and duration of malaxation increased oil yield, however oil production increased substantially up to 35cC and 45 min but did not show a significant difference after that point. An examination of the qualitative characteristics of oil showed that, under the conditions tested, there was no significant difference in quality. The oil produced was of the highest quality. It was concluded that the optimal extraction method lor the production of good quality oil with a satisfactory yield is to employ double milling with malaxation for 45 min at 35°C.