Determination of fatty acid and tocopherol compositions and the oxidative stability of walnut (Juglans regia L.) cultivars grown in Serbia

Biljana Rabrenovic, Etelka Dimic, Milan Maksimovic, Sladjana Sobajic and Ljiljana Gajic-Krstajic
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Biljana Rabrenovic: Department of Food Technology and Biochemistry, Faculty of Agriculture, University of Belgrade, Zemun, Serbia
Etelka Dimic: Faculty of Technology, University of Novi Sad, Novi Sad, Serbia
Milan Maksimovic: Institute of Hygiene, Military Medical Academy, Belgrade, Serbia
Sladjana Sobajic: Department of Bromatology, Faculty of Pharmacy, Belgrade University, Belgrade, Serbia
Ljiljana Gajic-Krstajic: Faculty of Agronomy, University of Kragujevac, Cacak, Serbia

Czech Journal of Food Sciences, 2011, vol. 29, issue 1, 74-78

Abstract: Five cultivars (Sampion, Jupiter, Sejnovo, Elit, and Geisenheim 139) of walnuts (Juglans regia L.) were collected during the 2008 harvest, from Cacak, Central Serbia. Two techniques of oil extraction were implemented - cold pressing and organic solvent extraction. The influence of the implemented methods on the fatty acid composition, tocopherol content as well as oxidative stability was examined. Predominant fatty acids were palmitic, oleic, linoleic, and linolenic acids. The oleic acid content of the oils ranged from 15.9-23.7% of the total fatty acids, while the linoleic acid content ranged from 57.2-65.1% and that of linolenic acid from 9.1-13.6%. The process of oil extraction had no significant effect on the content and composition of fatty acids in the oil. The total content of tocopherols ranged from 28.40 mg/100 g to 42.40 mg/100 g of the extracted oil. The most common tocopherol in all samples was γ-tocopherol. The oil extracted using the Soxhlet method contained higher amounts of total tocopherols while the stability of the oil samples, expresed as induction period, ranged from 5.0 h to 7.1 hours. Reduced stability of the oil samples as measured by the Rancimat method was negatively correlated with the level of linolenic acid and total content of tocopherols.

Keywords: walnut oil; solvent extraction; cold pressing; fatty acid composition; tocopherol content; oxidative stability (search for similar items in EconPapers)
Date: 2011
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjf:v:29:y:2011:i:1:id:180-2010-cjfs

DOI: 10.17221/180/2010-CJFS

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