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It is usually expressed as a percentage of oleic acid (the main fatty acid present in olive oil) in the oil. As defined by the European Commission regulation No. 2568/91 and subsequent amendments, [ 1 ] the highest quality olive oil (extra-virgin olive oil) must feature a free acidity lower than 0.8%.
Free oleic acid occurs in oils and fats as a product of the breakdown of triglycerides. Olive oil exceeding 2% free oleic acid is graded unfit for human consumption. See Fatty acid § Free fatty acids. [7] Oleic acid is the most abundant fatty acid in human adipose tissue, [14] and second in abundance in human tissues overall, following ...
The nutritional values are expressed as percent (%) by mass of total fat. Type Processing treatment [3] Saturated fatty acids Monounsaturated fatty acids Polyunsaturated fatty acids Smoke point; Total [1] Oleic acid (ω−9) Total [1] α-Linolenic acid (ω−3) Linoleic acid (ω−6) ω−6:3 ratio; Avocado [4] 11.6: 70.6: 52–66 [5] 13.5: 1: ...
Mid-oleic sunflower oil, which contains 50% oleic acid. This oil is used when low-temperature cooking is required. High-oleic sunflower oil, which is 80% oleic acid.
For determining the acid value of mineral oils and biodiesel, there are standard methods such as ASTM D 974 and DIN 51558, and especially for biodiesel the European Standard EN 14104 and ASTM D664 are both widely used worldwide. [2] Acid value of biodiesel should be lower than 0.50 mg KOH/g in both EN 14214 and ASTM D6751 standard fuels.
In either numbering scheme, the position of a double bond in a fatty acid chain is always specified by giving the label of the carbon closest to the carboxyl end. [d] Thus, in an 18 carbon fatty acid, a double bond between C-12 (or ω−6) and C-13 (or ω−5) is said to be "at" position C-12 or ω−6. The IUPAC naming of the acid, such as ...
Elaidic acid has 18 carbons and is a trans-9-mono-unsaturated fatty acid. It is also a trans isomer of oleic acid. C 17 H 33 CO 2 H, IUPAC organization name (E)-octadec-9-enoic acid, numerical representation 18:1 (9), n-9, molecular weight 282.46, melting point 43–45 °C. CAS Registry Number 112-79-8.
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