Question

You are asked to find the appropriate analyzes for the purpose of determining the following characteristics for the oil samples you have. Indicate which feature you can determine with which analysis, by simply typing the name of the analysis method.

1. Degree of unsaturation

2. Susceptibility to oxidative rancidity

3. Status of oxidative rancidity

4. Average molecular weight

5. Status regarding hydrolytic rancidity

Answer 1

Degree of Unsaturation :

The degree of unsaturation formula takes the number of carbon atoms (C), number of nitrogen atoms (N), number of halogen atoms
(X), and the number of hydrogen atoms (H) as input values. These values can be easily obtained from the molecular formula of the compound. For how to calculate the degree of unsaturation, the formula is given as:
Du = (2c +2+N -x -H )/2

2. Susceptibility to oxidative rancidity :

The availability or presence of oxygen, increased temperatures, the impact of light and the presence of pro-oxidants speed up autoxidation (oxidative rancidity) over a period of time.

3. Status of oxidative rancidity

One common method is the peroxide value test, which measures the amount of peroxides (indicators of rancidity) in the product. Another method is the p-anisidine test, which measures the level of aldehydes (another indicator of rancidity) in the product.

4.Average molecular weight

Osmometry is applied to determine number average of molecular weight (Mn).

5. Status regarding hydrolytic rancidity

Peroxide Value (PV)

p-Anisidine (p-AV)

TBA Rancidity (TBAR)

Free Fatty Acids (FFA)

Oxidative Stability Index (OSI)