Quality evaluation of cold-pressed edible oils from Macedonia

Kostadinovic Velickovska, Sanja and Bruhl, Ludger and Mitrev, Sasa and Mirhosseini, Hamed and Matthaus, Bertrand (2015) Quality evaluation of cold-pressed edible oils from Macedonia. European Journal of Lipid Science and Technology, 117. ISSN 1438-9312

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The chemical composition and quality of eight pure cold-pressed oils and two blend oils from Macedonia
were examined in this work. The highest level of oleic acid was determined in apricot kernel oil and
rapeseed oil with abundance of 70.9 and 59.2%, respectively. The highest level of polyunsaturated fatty
acids was seen for flaxseed and hemp seed oil with abundance of a-linolenic acid of 55.1% for flaxseed oil
and linoleic acid of 57.4% for hemp seed oil. Apricot kernel oil and roasted sesame seed oil had the
highest oxidative stability with induction times of 7.6 and 10.9 h. Apricot oil, hemp seed oil, and flaxseed
oil had the highest level of total vitamin-E-active compounds with 58.8, 58.1, and 69.7 per 100 g of oil
with predomination of g-tocopherol. The highest peroxide number was detected in blend oils (oil 2 and
oil 8) with values over 10 meq O2/kg of oil. The highest FFA was detected in rapeseed oil (1.57%).
Roasted and unroasted sesame seed oils had relatively high specific extinction (K232 values 3.55 and
3.33, respectively). However, the highest UV extinction had a blend of pumpkin seed oil and sunflower
oil with a value of 3.84.
Practical applications: The results of this study can be applied for determination of the most
important major and minor components responsible for quality evaluation of cold-pressed oils.
Statistical results indicated a strong relationship between the level of monounsaturated fatty acids in
the oil and their oxidative stability. The level of tocopherols and other vitamin-E-related
compounds was in strong relationship with the antioxidant activity of the oils measured by the
DPPH method. Phytosterols, as minor compounds present in the oils, did not contribute
significantly to the total antioxidant potential of the oils but, their levels in particular oils, together
with fatty acids, can be useful and reliable markers for the purity of the oils and determination of the
composition of blends.

Item Type: Article
Subjects: Natural sciences > Chemical sciences
Divisions: Faculty of Agriculture
Depositing User: Sanja Kostadinovik
Date Deposited: 26 May 2015 10:21
Last Modified: 26 May 2015 10:32
URI: https://eprints.ugd.edu.mk/id/eprint/13188

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