Non-destructive Estimation of Mandarin Maturity Status Through Portable VIS-NIR Spectrophotometer |
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Authors: | Francesca Antonucci Federico Pallottino Graziella Paglia Amedeo Palma Salvatore D??Aquino Paolo Menesatti |
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Affiliation: | (1) CRA-ING Agricultural Engineering Research Unit of the Agriculture Research Council, Via della Pascolare, 16, 00015 Monterotondo scalo, Rome, Italy;(2) ISPA-CNR Istituto di Scienze delle Produzioni Alimentari-National Research Council, Traversa la Crucca, 3 Localit? Baldinca, 07040 Li Punti, Sassari, Italy |
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Abstract: | Sugar content is one of the most important quality attributes of citrus fruit, either for fresh or for processing market.
Since sugars in citrus juice are highly correlated with total soluble solids (TSS) content, which can be determined easily
even by the means of a hand refractometer, TSS is one of the most frequently used quality index. Since TSS can be measured
only destructively, the results are representative only if carried out on large samples and do not allow classifying marketable
fruit one by one according to their specific sugar content. Objective of this experiment was to assess possibility and limits
of a non-destructive estimation of citrus fruits internal quality parameters (TSS and titratable acidity) presenting thick
peel by the use of a spectrophotometric portable VIS-NIR system. Four hundred fruit of “Miho” satsuma and 150 fruit of “Page”
tangelo were used. Each fruit was first subjected to spectrophotometric acquisition and soon after was juiced and TSS and
titratable acidity (TA) determined. Partial least squares (PLS) regression analysis was applied for constructing a predictive
model based on the spectral normalized response, constructing the model on a sub-sample and verifying the model (prediction
test) on independent ones. The TA relative to Page mandarin was predicted in the test with an r = 0.88 and a standard error of prevision (SEP) coefficient of variability of 3.8% while the TSS scored an r = 0.85 and a SEP coefficient of variability equal to 4%. The TA of Miho mandarin was predicted in the test with an r = 0.81 and a SEP coefficient of Variability of 8.3% while the TSS scored an r = 0.84 and a SEP coefficient of variability equal to 5.6%. |
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