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The specific absorbance values measured in olive oil are measured at 232 nm and 270 nm and are considered as an indicator of their resistance to oxidation.
Specific absorbance value; It gives information about the quality of the oil, the storage of the oil and its oxidation level. It is also a parameter used to detect the presence of adulteration.
Diene and triene conjugation are determined by specific absorbance values in UV. The primary products of oxidation diene at 232 nm, and the secondary products triene at 270 nm.
Absorbance values are used as a reliable method to determine the purity and quality of olive oil. High UV values indicate that oxidation occurs as a result of storage or refining.
According to the Turkish Food Codex Communique on Olive Oil and Pomegranate Oil issued by the Ministry of Food, Agriculture and Livestock (Communiqué No: 2010/35), the analysis results are evaluated based on the specific absorption values in UV light.
If the peroxide value is high in olive oil, the K232 value will also be high and exceed the limits. ΔK value; It is a criterion used to determine the presence of refined or pomace oil in olive oil and to determine whether olive oils have been processed with acid bleaching soils. K270 gives information about adulteration.
The K270 value is high as a result of adulteration made by adding refined and pomace oil made in olive oils.
