The 888 Titrando from Metrohm can be used to determine free fatty acid content of edible oils and fats.
The acid content of vegetable oil is given by the quantity of free fatty acids (FFA) deriving from the hydrolytic rancidity of triglycerides.
This rancidity occurs in unsuitable conditions for the processing and preservation of oils, therefore, acidity represents a basic indicator of the genuineness of vegetable oils such as olive oil, avocado oil and so on.
Fatty acid concentrations equal or higher than 1mM may be determined by titrimetry even in the presence of other lipids.
Titrimetry is used to determine the acid value (free fatty content) of vegetable oils and fats.
This acid value is defined as the number of mg of KOH required to neutralise the fatty acids contained in 1g of the fat.
It is very easy to express the results in other units as mg fatty acids per g of sample or mmoles per kg.
For this analysis, the 888 Titrando from Metrohm is simple to use and gives fast and reproducible results.
The Metrohm Solvotrode combination pH glass electrode has been specially designed for use with nonaqueous acid-base titrations, and is used in conjunction with the 888 for this application.
This electrode can be used in many applications where it was previously necessary to use three and four electrode systems due to electrostatic interferences.
