Food Chemistry
Laleh Arjmand Fard; Shahla Shahriari; Mehrdad Ghavami
Abstract
Introduction: Olive oil is one of the most useful vegetable oils. The climatic conditions, cultivars, cultivation methods, harvesting time and processing method determine the final qualities of olive oil, recognizing the best olive oil for leaching seems to be necessary. Materials and Methods: This ...
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Introduction: Olive oil is one of the most useful vegetable oils. The climatic conditions, cultivars, cultivation methods, harvesting time and processing method determine the final qualities of olive oil, recognizing the best olive oil for leaching seems to be necessary. Materials and Methods: This study aimed to evaluate the chemical composition, acidity index, iodine and soap number of virgin olive oil derived from Amygdal, Manzanilla, Arbicen and mixed vegetable oils grown in Darab, Shiraz. Results and Discussion: The results showed that all the oil acidity index the limit set by the Codex and IOOC were higher. The maximum and a minimum number of olive oil acid, was observwd in the amygdala (83.7%) and Arbicen (83.1%) respectively. The highest and lowest amount of iodine was seen in olive cultivar Manzanilla (78.06) and Arbicen (81.6122), respectively. No significant difference in soap numbers in the samples was observed. During the study of tecopherolone compounds, alpha-tocopherol was the highest in all samples, after which the levels of alpha-tocopherol and gamma-tocopherol were higher than all compounds. Delta-tocopherol and Delt- tocutriol were not observed in any of the examined specimens. The highest total Techenological compound was in Manzanilla (1691.88%). oleic fatty acid abundant in all samples. The content of oleic and linoleic acid show that oleic acid and linoleic acid content is always an inverse correlation. Also, the linoleic acid content increases with the reduction of oleic acid. Investigation of conjugated compounds showed that the samples were Virgin.
Reza Farhoosh; Mohammad Hossein Hadad Khodaparast
Abstract
In the present study, the oxidative stability of nine Iranian commercial olive oils, including four virgin samples and five deodorized ones, was compared to that of two foreign virgin olive oils. In total, the foreign samples had the MUFA/PUFA ratios (av. 9.27) higher than those of domestic ones (av. ...
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In the present study, the oxidative stability of nine Iranian commercial olive oils, including four virgin samples and five deodorized ones, was compared to that of two foreign virgin olive oils. In total, the foreign samples had the MUFA/PUFA ratios (av. 9.27) higher than those of domestic ones (av. 5.70). The peroxide and acid values of the olive oils studied ranged from 8.5 to 14.5 meq/kg and from 0.1 to 4.27 mg/g, respectively. Tocopherols content of the foreign olive oils (av. 436.7 ppm) was averagely higher than that of the domestic olive oils and even about two times that of domestic virgin ones (223.4 ppm). On average, the foreign virgin olive oils contained phenolic compounds (154.0 ppm) higher than that of the domestic ones (112.3 ppm) and especially deodorized olive oils (46.0 ppm). The oxidative stability of oil samples was suitably interpreted in terms of chemical composition data, so that the foreign virgin olive oils had more appropriate chemical composition in total, and therefore, indicated oxidative stabilities higher than those of the domestic virgin and deodorized olive oils.
