What is the peroxide value of palm oil?
The peroxide values (PV) of the fresh oil sample were low (0.00 – 10.40mEq/kg). The iodine values of the fresh oil samples were lower (23.57 – 48.95) than those kept under different conditions (40.32 – 70.43). Palm oils should not be stored for a long time because of deterioration.
What is peroxide value in oil?
The peroxide value is defined as the amount of peroxide oxygen per 1 kilogram of fat or oil.
What is the saponification value of palm kernel oil?
6.3. 2 Saponification number
| Oil | SN |
|---|---|
| Olive | 187–196 |
| Palm | 200–205 |
| Palm kernel | 240–257 |
| Peanut | 184–196 |
What causes high peroxide value in palm oil?
The peroxide value in the palm oil points out the state of oxidation of a substance. If oxidation proceed for long, it makes the oil rancid and give an unpleasant smell to the substance. This phenomenon is influenced by temperature of preservation and by the contact with air and light.
How do you determine the value of hydrogen peroxide?
Peroxide value is a measure of the peroxides contained in the oil. The peroxides present are determined by titration against thiosulphate in the presence of KI….Calculation.
| Peroxide value ( milliequivalent peroxide/kg sample) = | S x N x 1000 |
|---|---|
| Weight of sample (g) |
What is the peroxide value of canola oil?
Control samples showed a peroxide value of 58.50 mequiv/kg and absorptivity at 232 nm of 10.264 after 6 days of oven test.
What does a low saponification value mean?
The higher the saponification value, the lower the fatty acids average length, the lighter the mean molecular weight of triglycerides and vice-versa.
What does a high peroxide value indicate?
High peroxide levels indicate that oil has been damaged by free radicals and will give rise to aldehydes and ketones that can cause oil to smell musty and rancid. These reactions are accelerated by heat, light, and air. Like with levels of Free Fatty Acids, be wary of refined or blended olive oils.
What is a low peroxide value?
The amount of peroxide value of fats indicate the degree of primary oxidation and therefore its likeliness of becoming rancid. A lower number of peroxide value indicates a good quality of oil and a good preservation status.
How do you find the value of hydrogen peroxide?
The peroxide value is determined by measuring the amount of iodine liberated from a potassium iodide solution at room temperature. The liberated iodine is expressed in units of milliequivalents of peroxide-oxygen per 1000 grams of fat. For PVP we will extract up to 100 grams of the product.
What is the peroxide value of refined palm oil?
The degree of precision of the tests must be very accurate – peroxide values in refined oil are indeed lower than 1 mEqO2/Kg. The analytical reference method for the determination of peroxide value in palm oil is titration.
How to test for peroxide in palm oil?
The peroxide value in palm oil can be determined with CDR PalmOilTester, a fast and simple method of analysis. Results are correlated with reference methods (AOCS Official Method Cd 8-53) for both peroxide values lower than 1 mEqO2/Kg and higher values, beyond 60 mEqO2/Kg, thanks to calibration curves pre-set on the instrument and specific for
How to minimize the oxidation of deodorized palm oil?
Storage of the deodorized oils or packaging under nitrogen is of course most desirable to minimize oxidation. The alternate process of physical refining is generally applied to crude palm oil and other tropical oils that contain relatively large levels of free fatty acids.
What is the peroxide value of oil during autoxidation?
During autoxidation, the peroxide value of oil reaches a maximum followed by a decrease at more advanced stages varying according to the fatty acid composition of the oil and the conditions of oxidation ( Figure 5.1 ).