Soaps test in Oils and Fats

Soaps are salts of fatty acids obtained from a reaction that occurs between free fatty acids and sodium carbonate. Thanks to their water solubility and insolubility in oil, they can be separated from fat through specific procedures. Food industries use this technique to lower fat acidity and to enhance its organoleptic characteristics. For such industries, it is important to carry out a chemical analysis for determining the concentration of soaps in oil and fat.

CDR FoodLab method simplifies and speeds up the official procedure C8 NGD-1976 for testing the soaps in fats and, thanks to micro quantities used, allows to extend the analysis to samples of fat extraction is difficult.

Analyzers

You can test the value of the soaps in oils and fats with different systems of FoodLab Line:

• FoodLabFat: for testing oils and fats
• FoodLab: for testing food like milk, egg, tomato, vegetable sauces, cheese and fats.

To find out what is the analyzer that best suits your needs
See the comparison table »

Method

Test type: End Point.
Colorimetric reaction at 604 nm.
Testing time: immediate.
It is possible to carry out several test sessions with a maximum of 14 samples.
Calibration can be performed by aligning the test to reference values.

Test principle

At specific pH values soaps mixed with bromphenol, generate a specific blue colour. Its intensity, measured at 604 nm, is directly proportional to the concentration of soaps in the sample. CDR innovative method simplifies and accelerates the standard procedure to testing soaps in oils and fats, because it enables the test to be carried with micro-quantities and to be applied to fats that are difficult to extract.

Calibration Curve / Correlation Data

The method CDR FoodLab for analyze the concentration of soaps in oils and fats shows a good correlation with the reference method NGD C8-1976

Composition of the Kit and Reagents

Code *300175 - kit suitable for 100 tests, contains: 10 bags includes 10 pre-filled cuvette with reagent R1 (mixture of alcohols) and 2 bottles with R2 reagent (chromogen).

Code *300503 - kit suitable for 100 tests, contains: 1 bag includes 10 pre-filled cuvette with reagent R1 (mixture of alcohols) and 1 bottle with R2 reagent (chromogen).

Sample Handling and Usage of Curves

Sample
Oil as is (extracted from dry fruits, seeds, nuts, etc.). Solid fats: melted using bain-marie method before starting the test (animal fats, palm oil, etc.).

Extractable fats: extract the fatty part following the instructions provided in the test method (butter, cream, margarine, semi-finished products, etc.).