Fruits and vegetable have long been regarded as having considerable beneficial effects on health due in part, to the presence of bioactive compounds or phytochemicals. Some of these molecules, such as chlorophylls, carotenoids and anthocyanins are responsible for the organoleptic qualities of fruit and vegetables. In addition, they are implicated in numerous physiological processes of the plants, being produced in response to different types of abiotic and biotic stress. In particular, chlorophylls and carotenoids, widely found in the skins of fruits like apples, are involved in the photosynthesis process, while anthocyanins together with carotenoids, play an important role in protecting the fruits from photo-damage induced by UV irradiation. Thanks to these properties, the mentioned pigments play an important role as biomarkers of nutritional, healthy and commercial quality, so in this respect they receive great interest not only from nutritionists, but also from the agro-food industry. In apples, chlorophylls, carotenoids and anthocyanins undergo to the changes during ripening and storage of fruits and their direct determination by a non-destructive analytical approach make it possible to correlate the content of these pigments with the degree of ripeness, freshness and shelf life of fruits. Eventually, non-destructive analysis could allow to standardize the quality parameters to meet the needs of both consumers and market. In recent years, the photoacustic non-destructive technique (PA) have had a great acceleration in food analysis, since is not affected by scattering of light in turbid media, as occur for traditional spectroscopic techniques. Moreover, PA require little or no manipulation of the sample, nor require extraction procedures, so it can be employed for the direct optotermic characterization of the molecules contained in complex matrices such foods. PA measurement were carried out on the apple peels of two cultivars: Golden Delicious and Royal Gala. The results revealed that PA signals were in agreement with the presence of chlorophylls (a and b), carotenoids and anthocyanins in different side of apple according to the different colour of the portion of apple peel analysed. The quantitative standardization of the system will allow to correlate the concentration and the proportion of chlorophylls, carotenoids and anthocyanins with ripening state of the fruits in order to provide indication on optimum harvest date of apple fruits.

Photoacustic techniques applied to non-destructive analysis of phytochemicals in typical foods of the Mediterranean diet / Giusti, Anna Maria. - 1:(2014), pp. 57-57. (Intervento presentato al convegno International School of Quantum Electronics tenutosi a Erice (Sicily) nel 5-12 october 2014).

Photoacustic techniques applied to non-destructive analysis of phytochemicals in typical foods of the Mediterranean diet

GIUSTI, Anna Maria
2014

Abstract

Fruits and vegetable have long been regarded as having considerable beneficial effects on health due in part, to the presence of bioactive compounds or phytochemicals. Some of these molecules, such as chlorophylls, carotenoids and anthocyanins are responsible for the organoleptic qualities of fruit and vegetables. In addition, they are implicated in numerous physiological processes of the plants, being produced in response to different types of abiotic and biotic stress. In particular, chlorophylls and carotenoids, widely found in the skins of fruits like apples, are involved in the photosynthesis process, while anthocyanins together with carotenoids, play an important role in protecting the fruits from photo-damage induced by UV irradiation. Thanks to these properties, the mentioned pigments play an important role as biomarkers of nutritional, healthy and commercial quality, so in this respect they receive great interest not only from nutritionists, but also from the agro-food industry. In apples, chlorophylls, carotenoids and anthocyanins undergo to the changes during ripening and storage of fruits and their direct determination by a non-destructive analytical approach make it possible to correlate the content of these pigments with the degree of ripeness, freshness and shelf life of fruits. Eventually, non-destructive analysis could allow to standardize the quality parameters to meet the needs of both consumers and market. In recent years, the photoacustic non-destructive technique (PA) have had a great acceleration in food analysis, since is not affected by scattering of light in turbid media, as occur for traditional spectroscopic techniques. Moreover, PA require little or no manipulation of the sample, nor require extraction procedures, so it can be employed for the direct optotermic characterization of the molecules contained in complex matrices such foods. PA measurement were carried out on the apple peels of two cultivars: Golden Delicious and Royal Gala. The results revealed that PA signals were in agreement with the presence of chlorophylls (a and b), carotenoids and anthocyanins in different side of apple according to the different colour of the portion of apple peel analysed. The quantitative standardization of the system will allow to correlate the concentration and the proportion of chlorophylls, carotenoids and anthocyanins with ripening state of the fruits in order to provide indication on optimum harvest date of apple fruits.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/666662
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