The acid value and acidity account for the hydrolytic alteration of fats.
The acid value (AV) corresponds to the mass of potassium hydroxide (in mg) required to neutralize the free fatty acids present in 1 g of fat. AV is expressed in mg/g.
Acidity corresponds to the content of free fatty acids. It is expressed as a percentage by weight, and is frequently based on the amount of oleic acid.
The acid value and acidity are determined by dissolving the fat in a solvent (ethanol) and then titrating the acids present in the solution with an ethanolic solution of potassium hydroxide.
with R-COOH: free fatty acids
Method adapted from the NF EN ISO 660 standard (‘acid value and acidity”)
Method adapted from the NF EN ISO 660 standard (“acid value and acidity”)
Method adapted from the NF EN ISO 3961 standard (“acid value and acidity”)