Publications in year 2016

Vol. 23, Issue 4



Evaluation of technological quality of selected rapeseed oils

International Agrophysics
Year : 2016
Volumen : 23
Issue : 4
Pages : 519 - 531
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Authors: M. Bojanowska1, Joanna Lamorska2

1Department of Agricultural and Environmental Chemistry, University of Life Sciences ul. Akademicka 15, 20-950 Lublin, Poland
2Institute of Agricultural Sciences, State School of Higher Education in Chełm, Pocztowa 54, 22-100 Chełm, Poland
Abstract :

This study compares the quality of rapeseed oils produced by different methods and stored under different conditions. The following oxidation parameters were determined in the analysed oils: acid value, peroxide value, anisidine value and Totox value. The evaluated quality parameters were: saponification value, iodine value, colour and fatty acid profile. In the group of the analysed products, Kropla Zdrowia – cold pressed rapeseed oil that was refrigerated in a dark glass bottle – was characterised by high quality (AV = 0, PV = 0.05 meq O2 kg–1, FFA = 0.4 mg KOH g–1, Totox value = 0). In the cold pressed Organic Virgin oil stored in a clear glass bottle at room temperature, peroxide value, acid value and Totox value were above the norm at PV = 5.6 meq O2 kg–1, FFA = 4.27 mg KOH g–1 and Totox value = 13. The analysed products were characterised by similar fatty acid profiles, and Kropla Zdrowia oil had a higher content of oleic acid (by 10% on average) and a lower total content of linoleic acid and linolenic acid (by 11% on average) in comparison with the remaining products. All oils conformed to standard saponification values. The examined oils differed in colour, and pressed oils were darker. Three of the analysed products – Rapso, Olej Kujawski and Kropla Zdrowia – received high scores in a sensory evaluation. The lower scores noted in the remaining oils probably resulted from lower production standards and inadequate storage.

Keywords : rapeseed oil, sensory quality, peroxide number, acid number, fatty acid profile
Language : english