Peroxide Value Calculator

Peroxide value measures the concentration of peroxides and hydroperoxides formed as primary oxidation products in oils and fats. It's a key indicator of oil quality, freshness, and shelf life, helping determine if the oil is safe for consumption or suitable for industrial use.

For edible oils, peroxide values should typically be below 10 meq O2/kg for good quality. Virgin olive oil should be below 20 meq O2/kg, while refined oils should be below 5 meq O2/kg. Values above these limits indicate significant oxidation and potential rancidity.

Temperature significantly affects the accuracy of peroxide value measurements. Testing should be conducted at controlled temperatures (typically 20-25°C) as higher temperatures can accelerate oxidation during testing, leading to artificially elevated results.

High peroxide values result from oxidation processes caused by exposure to light, heat, oxygen, and metal catalysts. Poor storage conditions, extended shelf life, and contamination can accelerate lipid oxidation, leading to increased peroxide formation.

Testing frequency depends on the oil type and storage conditions. For commercial operations, monthly testing is common, while critical applications may require weekly testing. Fresh oils should be tested upon receipt and throughout storage to monitor quality degradation.

Peroxide value cannot be reduced through normal processing once oxidation has occurred. Prevention through proper storage (cool, dark, oxygen-free conditions) is key. Antioxidants can slow further oxidation but won't reverse existing peroxide formation.