A Study on the Specifications of Cold Pressed Colza Oil. 
Cold pressed oil extraction is the preferred method for seeds with high contents of oil, such as colza.  Generally speaking, expeller pressing is less complex, more cost efficient and safer than solvent extraction.  Moreover, cold pressed oils retain their natural properties better.  Cold pressed colza oil has been found to have numerous health benefits.  This was an original and unique study conducted as part of the research for the international Codex standard for cold pressed fats and oils, and aims to examine the chemical properties of two varieties of Iranian colza seed, Hyola and Okapi.  The studied factors included (a) chemical properties, and (b) physicochemical and quality characteristics.  Based on our findings, both varieties of colza seeds in this study had satisfactory levels of oleic and linoleic acid, and no trans-fatty acids.  Although both samples had good nutritional properties, the Hyola variety was higher in oleic acid, indicating better oxidative stability.  Due to the considerable amounts of β-sitosterol in both varieties, they may be effective in reducing cholesterol and preventing cancer.