Fac-simile Scheda Linee di Ricerca - Federalimentare

Dati pubblicati inerenti il tema di ricerca:1. Giovanelli G., Buratti S.(2009). Comparison of polyphenolic composition and antioxidant activityof wild Italian blueberries and some cultivated varieties. Food Chem. 112, 903-908.Four varieties of cultivated blueberries (Vaccinium corymbosum) and a wild crop (Vaccinium miyrtillus)originating form the Modena region in Italy (Mirtillo nero dell’Appennino Modenese) and protected by the markof origin, were examined in order to determine their antioxidant activity as related to their phenolic composition.The antioxidant activity was measured as radical scavenging activity, ferric reducing activity, and by anamperometric method; the total phenolics and total anthocyanins were determined by colorimetric methods;individual anthocyanins were evaluated by HPLC. Results showed that total phenolics and total anthocyaninconcentrations were, respectively two fold and three fold higher in the wild fruits, which also had a higheranthocyanin-to-total phenolic ratio. Determination of individual anthocyanins put in evidence some differencesbetween the cultivated and wild varieties, in particular the absence of acylated anthocyanins in wild blueberries.The antioxidant activity was much higher in wild blueberries than in the cultivated ones, and it was more relatedto the total phenolic rather that to the anthocyanin concentration.2. Sinelli N., .Spinardi A., Di Egidio V., Magnani I., Casiraghi E. 2008. Evaluation of qualityand nutraceutical content in blueberries (Vaccinium corymbosum L.) by near and midinfraredspectroscopy. Postharvest Biology and Technology 50, 31-36.Blueberries (family Ericaceae; genus Vaccinium corymbosum L.) are interesting fruit for potential health benefitsdue to their bioactive compounds (anthocyanins, flavonoids, polyphenols and ascorbic acid). Blueberry qualityindices and nutritional properties are generally determined by instrumental techniques (LC–MS; HPLC) thatare time and chemical consuming, laborious and expensive. The aim of this work was to examine the potential ofMIR and near-infrared (NIR) spectroscopy to evaluate both ripening indices and nutraceutical properties of twoblueberry cvs, ‘Brigitta’ and ‘Duke’, grown in Valtellina (northern Italy), harvest 2005 and 2006, collectedweekly from mature green to full ripe berry stage. Fruit from each ripening class was analysed for total solublesolids (TSS), total phenols, total flavonoids and total anthocyanins, ascorbate and spectroscopic analysis, such asFT-IR and FT-NIR. The spectral datasets were correlated with technological ripening parameters and withnutraceutical compounds by using partial least squares (PLS) regression algorithms both in full cross-validationand test set validation.The PLS analysis for quantitative prediction of TSS gave good calibration models in near (root mean standarderror in cross-validation (RMSECV) = 0.50% and root mean standard error in test set validation (RMSEP) =0.65%) and mid-infrared regions (RMSECV = 0.30% and RMSEP= 0.36%). The calibration models developedin the near infrared region were able to evaluate the content of total phenols (RMSECV = 0.14mg catechin/g andRMSEP = 0.18mg catechin/g), total flavonoids (RMSECV = 0.20mgcatechin/g and RMSEP =0.25mgcatechin/g) and total anthocyanins (RMSECV = 0.25mgmalvidin/g and RMSEP= 0.22mg catechin/g).The models developed in the midinfrared region proved to be well correlated with analytically determinatedphenolic compounds. The predicted results by the regression models developed for ascorbic acid in near andmid-infrared regions were not as good as those obtained for the phenolic parameters. On the whole, near andmid-infrared spectroscopy gave promising results as they were rapid and non-destructive methods able to evaluateat the same time, technological ripening indices and nutraceutical compounds of blueberries. These techniquescould be valid and simple tools to reduce the analytical time and cost of monitoring blueberry quality.SISTAL - SOCIETA’ ITALIANA DI SCIENZE E TECNOLOGIE ALIMENTARIDipartimento di Scienze e Tecnologie Agroalimentari, Università degli Studi della TusciaVia San Camillo de Lellis, 01100 ViterboTel.: 0761- 35 74 94/7 , Fax: 0761- 35 74 98, e-mail: mmoresi@unitus.it190