Yousef Lotfi; Esmaeil Khaleghi; Norollah Moallemi
Abstract
Given that, the qualitative characteristics of olive oil are influenced by environmental conditions and cultivars. Therefore, this study was carried out to investigate some of the oil qualitative characteristics of Tarom 2 and Dezful cultivars of olive as a randomized complete block design with 3 replications ...
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Given that, the qualitative characteristics of olive oil are influenced by environmental conditions and cultivars. Therefore, this study was carried out to investigate some of the oil qualitative characteristics of Tarom 2 and Dezful cultivars of olive as a randomized complete block design with 3 replications at Shahid Chamran University of Ahvaz during 2016-2017. The results indicated that, the oil extracted from Tarom 2 cultivar exhibited the highest peroxide value (9.25 meq of O2/ kg of oil), chlorophyll content (8.10 mg/kg of oil), and carotenoid (0.16 mg/kg of oil) and K232 and K270 extinction coefficients of 2.32 and 0.61, respectively. However, total phenolic content of the oil extracted from Dezful cultivar (552.66 mg/kg of oil) was higher than that of the other cultivar. In addition, the highest oleic acid content (58.52%) and lowest palmitic acid content (17.6%) were measured on the oil obtained from the Tarom 2 cultivar, while the oil extracted from Dezful cultivar showed the highest linoleic acid content (18.05%). Furthermore, oleic acid-to-linoleic acid ratio was higher in the oil extracted from the Tarom 2 cultivar rather than the one taken from the Dezful cultivar. Therefore, based on the results obtained from the experiment, the oil extracted from Tarom 2 cultivar is expected to exhibit higher oxidative stability than that of the Dezful cultivar.
Esmaeil Khaleghi; Kazem Arzani; Norollah Moallemi; Mohsen Barzegar
Abstract
The effect of Kaolin on fruit and oil of olive cv. `Zard’ was evaluated in a commercial orchard in Fasacity, Fars Province. Mature olive trees cv. `Zard’ were sprayed with 0, 3 and 6% kaolin after 60 days, 60and 90 days and 60, 90, 120 days after full bloom. Results showed that kaolin concentration ...
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The effect of Kaolin on fruit and oil of olive cv. `Zard’ was evaluated in a commercial orchard in Fasacity, Fars Province. Mature olive trees cv. `Zard’ were sprayed with 0, 3 and 6% kaolin after 60 days, 60and 90 days and 60, 90, 120 days after full bloom. Results showed that kaolin concentration and sprayingtime had not significant effects on physicochemical parameters but they had significant effects on freefatty acids composition. linoleic acid (14.49 percent) and linolenic acid (1.02%) were lowest in the thirdlevel of spraying time. Amount of oleic acid, monounsaturated fatty acids to polyunsaturated fatty acids,oleic acid to linoleic acid were higher in oil extracted from trees treated with 3 or 6% kaolin than theuntreated trees. Also, oleic acid to linoleic acid (4.65%), monounsaturated fatty acids to polyunsaturatedfatty acids (4.2%) were the highest in 6% kaolin with thrice spraying treatment (6% kaolin × thricespraying) while linolenic acid, palmitic acid, linoleic acid were the lowest in 6% kaolin × thrice spraying.Therefore this study showed fatty acids composition was improved by kaolin spraying.