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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.
Pauling's second rule is that the value of the first pK a for acids of the formula XO m (OH) n depends primarily on the number of oxo groups m, and is approximately independent of the number of hydroxy groups n, and also of the central atom X. Approximate values of pK a are 8 for m = 0, 2 for m = 1, −3 for m = 2 and < −10 for m = 3. [28]
pH indicators: a graphic view. A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. [1]
Nutri-Score label (A) for the highest nutritional quality. The Nutri-Score, also known as the 5-Colour Nutrition label or 5-CNL, is a five-colour nutrition label and nutritional rating system [1] and an attempt to simplify the nutritional rating system demonstrating the overall nutritional value of food products. It assigns products a rating ...
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: ...
White goods must be labelled with a label indicating energy consumption. This is not strictly a 'traffic light' but by analogy a scale of seven values that run from red to green through intermediate colours. The system may also be used for the European Game Information System , [4] which puts age ratings onto video games. Again this is not ...
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%. Virgin olive oil is characterized by acidity ...
As foods vary by brands and stores, the figures should only be considered estimates, with more exact figures often included on product labels. For precise details about vitamins and mineral contents, the USDA source can be used. [1] To use the tables, click on "show" or "hide" at the far right for each food category.
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