Evaluation of Quality and Nutraceutical Content in Blueberries (Vaccinium corymbosum) by Near and Mid Infrared Spectroscopy
Articolo
Data di Pubblicazione:
2009
Citazione:
Evaluation of Quality and Nutraceutical Content in Blueberries
(Vaccinium corymbosum) by Near and Mid Infrared Spectroscopy / N. Sinelli, A. Spinardi, V. Di Egidio, I. Mignani, E. Casiraghi. - In: ACTA HORTICULTURAE. - ISSN 0567-7572. - 810(2009), pp. 807-815. ((Intervento presentato al 9. convegno International Vaccinium Symposium tenutosi a Corvallis, Oregon nel 2008.
Abstract:
Blueberries (Vaccinium corymbosum L.) are interesting fruit for potential
health benefits due to their bioactive compounds (polyphenols, including
anthocyanins and other flavonoids and ascorbic acid). Levels of bioactive
compounds are influenced by ripening stage, genotype, cultivation techniques and
climatic conditions during the pre- and postharvest period. The blueberry quality
indices and nutritional properties are generally determined by colorimetric or
chromatographic techniques (LC-MS, HPLC) that consume time and chemicals, and
are laborious and expensive. In recent years, the development in multivariate
statistical techniques (chemometrics) and instrumentation have focused increasing
attention on rapid methods for predicting the concentration of specific chemical
constituents. Mid and near infrared spectroscopy are rapid, non-invasive
techniques, relatively inexpensive and require minimal sample processing before
analysis. These techniques, combined with chemometric tools, can be used for
qualitative and quantitative analysis of organic products. The aim of this work was
to examine the potential of MIR and NIR spectroscopy to evaluate ripening indices
and nutraceutical properties of two cultivar of blueberries (‘Brigitta Blue’ and
‘Duke’) grown in Valtellina (northern Italy) and harvested in 2005 and 2006,
collected weekly from mature green to full ripe berries. Fruit from each ripeness
class was analyzed using conventional methods for total soluble solids, total phenols,
total flavonoids and total anthocyanins, ascorbate and by spectroscopic analysis,
such as FT-IR and FT-NIR. The spectral data sets were correlated with
technological ripening parameters and with nutraceutical compounds by using
Partial Least Squares (PLS) regression algorithm.
The PLS analysis for quantitative prediction of TSS gave a good calibration
model in the near and mid infrared regions; also the calibration models developed in
near and mid infrared regions were able to estimate the content of anthocyanins,
polyphenols and flavonoids. On the whole, near and mid infrared spectroscopy gave
promising results as they were rapid and non destructive methods to simultaneously
evaluate technological ripening indexes and nutraceutical compounds of blueberries.
These techniques could be valid and simple tools to reduce the analytical time and
cost of monitoring blueberry quality.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Antioxidant; Blueberry; Non-destructive methods; Ripening indexes
Elenco autori:
N. Sinelli, A. Spinardi, V. Di Egidio, I. Mignani, E. Casiraghi
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