What is the solution used for titration in peroxide value analysis?
What is the solution used for titration in peroxide value analysis?
The peroxide value is a measure of the oxidation present. 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. The liberated iodine is titrated with a standard solution of sodium thiosulfate.
What does the peroxide number of fats and oils measure?
state of oxidation
Peroxide value is the most commonly used assay for measuring the state of oxidation in fats and oils and its value measures the oxidative rancidity or degree of oxidation of the fat/oil, but not its stability.
What is the significance of measuring the peroxide value of an oil or fat sample?
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 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 principle of peroxide value?
The peroxide value (PV) determines the concentration of hydroperoxide, the primary oxidation products. The principle involves peroxides liberating iodine from potassium iodide, i.e. The amount of peroxides is calculated back by the amount of sodium thiosulfate (Na2S4O6) consumed.
How do you determine the peroxide value of oil?
The peroxide value (POV) is defined as the reactive oxygen contents expressed in terms of milliequivalents (meq) of free iodine per kilogramme of fat. It is determined by titrating iodine liberated from potassium iodide with sodium thiosulphate solution. Oils with POV well below 10 meq/kg are considered fresh.
Why do we determine peroxide value?
Peroxide value is an indication of the initial stage of fat and oil deterioration. It is an indicator to determine the amount of hydroperoxides, the primary oxidation product of oil and fat [8] . A fat that has a peroxide value greater than 10 units is considered rancid [1]. …
What is peroxide value of fat?
12.6. 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).
What is peroxide value determination?
Why peroxide testing is used?
The presence of hydrogen peroxide can contaminate the milk. The purpose of the test is to detect any traces inside the product. This test also allows to check the possible addition of hydrogen peroxide in raw milk, before pasteurization, to increase its shelf-life.
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.
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