Journal Highlight: Non-destructive evaluation of ripening and quality traits in apples using a multiparametric fluorescence sensor

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  • Published: Aug 13, 2012
  • Author: spectroscopyNOW
  • Channels: UV/Vis Spectroscopy
thumbnail image: Journal Highlight: Non-destructive evaluation of ripening and quality traits in apples using a multiparametric fluorescence sensor

Non-destructive evaluation of ripening and quality traits in apples using a multiparametric fluorescence sensor

Journal of the Science of Food and Agriculture, 2012, 92, 1855-1864
Debora L Betemps, Jose Carlos Fachinello, Simone P Galarça, Nicacia M Portela, Damiano Remorini, Rossano Massai, Giovanni Agati

A fluorescence-based portable sensor was used for the non-invasive determination of chlorophylls, anthocyanins and flavonols in several apple cultivars. Abstract: The detection of pigments and colourless flavonoids in apples can provide a useful indication of fruit quality. Optical methods are preferable because they are fast and non-destructive. In this study, a fluorescence-based portable sensor was used in order to non-invasively determine the content of chlorophylls, anthocyanins and flavonols in Fuji, Granny Smith and Golden Delicious apple cultivars. The aim was to define new non-destructive optical indices of apple quality. The anthocyanin index (ANTH) in Fuji was higher in the sunny (i.e. sun-exposed) side of the fruit compared to the shady side. For all cultivars, the flavonol index (FLAV) was higher in the sunny side compared with the shady side. The chlorophyll index (CHL) for the shady sides of Granny Smith and Golden Delicious was significantly higher than for the sunny sides. Fine linear regressions were found between the ANTH, FLAV and CHL indices and the actual anthocyanin, flavonol and chlorophyll concentrations, respectively, which were determined destructively on the apple peel extracts. A negative correlation was found between the apple sugar content and the chlorophyll fluorescence in the far-red spectral band. Our results indicate that a single multiparametric fluorescence-based sensor can provide valuable non-destructive markers of ripening and quality in apples.

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