What affects peroxide value?
Peroxide Value (PV) Thermal properties of biological material are dependent on its moisture content [24]. Reason for highest influence of moisture content may be associated with this fact. It is known that factors such as temperature, light, moisture, metals and oxygen affect rate of oxidation.
How peroxide value is determined?
The peroxide value is determined by measuring the amount of iodine which is formed by the reaction of peroxides (formed in fat or oil) with iodide ion. The base produced in this reaction is taken up by the excess of acetic acid present.
What does high peroxide value indicate?
Results are expressed as meqO2/Kg. 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.
What is an acceptable peroxide value?
It is expressed as peroxide value (PV) in units of milli-equivalents (meq) peroxide per 1 kg of fat extracted from the food. A general rule is that PV should not be above 10–20 meq/kg fat to avoid rancidity flavor (Connell, 1975).
How do you test the content of hydrogen peroxide?
Test the peroxide-forming chemical with a commercial test strip (available from many chemical vendors). Commercial test strips have a test range of approximately 0.5 to 100 ppm. If peroxides are greater than the concentration range measured by the test strip contact EHS to have it properly disposed.
What is 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.
What is PV value in oil?
It is also a measure of the extent to which an oil sample has undergone primary oxidation, especially during storage. Freshly refined oils usually have a PV lower than 1 mEq/kg oil, while at a PV of above 10 mEq/kg oil, the oil is considered to be oxidized (Gunstone, 2008; Sebastian et al., 2014).
What is oxidative rancidity?
Oxidative rancidity in foods refers to the perception of objectionable flavours and odours caused by oxidation of the unsaturated fatty acid chains of lipids by atmospheric oxygen. It constitutes one of the major causes of quality deterioration in both natural and processed foods.
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 is the unit for peroxide value?
milliequivalents
Note 1 to entry: The peroxide value is usually expressed in milliequivalents (meq) of active oxygen per kilogram of oil, but it may also be expressed (in SI units) as millimoles (mmol) of active oxygen per kilogram of oil.
How do you calculate the peroxide value of oil?
The peroxide value (PV) is expressed as milliequivalents of iodine per kg of lipid (meq/kg), or as millimole of hydroperoxide per kg of lipid (referred to as peroxide). PV expressed as meq/Kg = 2 × PV mmol/kg.
What is the formula for peroxide value in iodometric titration?
Peroxide value is determined by iodometric titration. Iodometric titration is based on the oxidation of the iodide ion (I-) by hydroperoxides (ROOH): LOOH + 2 H++ 2 KI →I 2+ LOH + H 2 O + 2 K (clear) (yellow) I
What is the titration method for hydroperoxides?
The method involves the titration of iodine produced by reaction of the hydroperoxides with potassium iodide added as a reducing agent. The following method is based on the American Oil Chemists’ Society (AOCS) Recommended Official Method Cd 8-53.
What is the peroxide value in organic chemistry?
The peroxide value is a parameter specifying the content of oxygen as peroxide, especially hydroperoxides in a substance. The peroxide value is a measure of the oxidation present. 2. Principle The sample is treated in solution with a mixture of acetic acid and a suitable organic solvent and then with a solution of potassium iodide.
How to measure the presence of hydrogen peroxide (H2O2)?
This procedure describes a method to measure the presence of hydrogen peroxide (H 2 O 2) through two major steps. In the first step, an iodide solution is added to the analyte under acidic conditions in the presence of molybdate catalyst.