Pacific Sensor Technologies introduces a new range of photometers manufactured by Milwaukee Meters to measure peroxide value in oil-making processes.
The Milwaukee Meters Mi490 photometers are a user-friendly range of instruments that provide direct readings with a range of 0.0 to 25.0 meq O2/kg.
The peroxide value indicates the measurement of the oil's chemical degradation, measuring the degree to which the oil is oxidised.
Rancidification is the decomposition of fats and other lipids by hydrolysis and/or oxidation. Hydrolysis will split fatty acid chains away from the glycerol backbone in glycerides. These free fatty acids can then undergo further auto-oxidation. Oxidation primarily occurs with unsaturated fats by a free radical-mediated process.
Peroxide value is one of the most widely used tests for oxidative rancidity, and is a measure of the concentration of peroxides and hydroperoxides formed in the initial stages of lipid oxidation. Milliequivalents of peroxide per kilo of fat are measured by titration with iodide ion.
Peroxide values are not static and care must be taken in handling and testing samples. It is difficult to provide a specific guideline relating peroxide value to rancidity. While high peroxide values are a definite indication of rancid fat, moderate values may be the result of depletion of peroxides after reaching high concentrations.
Milwaukee Meters is a specialist supplier of low cost water quality instruments designed for superior quality and performance.