An opto-electronic system for in-situ determination of peroxide value and total phenol content in olive oil
2015
Grossi, Marco | Di Lecce, Giuseppe | Arru, Marco | Gallina Toschi, Tullia | Pierre,
The quality of olive oil is essentially determined by the product free acidity and peroxide value, while the total phenol content is also important for a high antioxidant capacity. Generally, these parameters are measured with laboratory analysis, that are expensive and may require a few days. Thus, a cheap and easy technique usable by untrained personnel, “on-site” and producing results “in real time” during production is desirable, particularly as far as small olive oil mills and packaging centers are concerned. This paper describes a technique to determine peroxide value and total phenol content in olive oil, that is based on the measurement of optical density of an emulsion between a suitable chemical reagent and a small quantity of the oil of interest. The optical density is measured by illuminating the sample with a LED with peak wavelength of 569nm for peroxide value and 835nm for total phenol content. The experimental results show good correlation (R2=0.883 and 0.895 for peroxide value and total phenol content, respectively) between data measured with the standard methodology and the technique of this work, implemented also in the form of a portable embedded system.
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