Physico-chemical characteristics and oxidative stability of walnut (Juglans regia L.) oil from cultivar Geisenheim-139 | Fizicko-hemijske karakteristike i oksidativna stabilnost ulja oraha (Juglans regia L.) sorte Gajzenhajm-139
2008
Rabrenovic, B., Poljoprivredni fakultet, Beograd - Zemun (Serbia). Institut za prehrambenu tehnologiju i biohemiju | Picuric-Jovanovic, K., Poljoprivredni fakultet, Beograd - Zemun (Serbia). Institut za prehrambenu tehnologiju i biohemiju
The aim of this work was isolation and determination of oil from the walnut cultivar Geisenheim-139. Two techniques of oil extraction were implemented: cold pressing and organic solvent extraction. Composition of walnut kernels was determined and also the basic physico-chemical parameters of walnut oil. The oil content was 71.23%. The fatty acid composition was identified by gas chromatography and the main components were as follows: linoleic acid 58%, oleic acid 18.6% and linoleic acid 13.1% for sample obtained by cold pressing and 57.3%, 19.8%, 13.6% for sample obtained by solvent extraction. Total tocopherols content was analyzed by HPLC and ranged from 37.6 mg% for oil sample obtained by cold pressing and 42.40% for solvent extracted sample. Predominant tocopherol was gama-tocopherol. The content of sterols was determined from the unsaponifiable fraction. The dominant sterols were beta-sitosterol and D-5 avenasterol. Oxidative stability of samples was measured by Rancimat method. Oil sample obtained by organic solvent extraction had better oxidative stability (5.8 h) than the sample obtained by cold pressing (5.0 h).
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