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Advisor(s)
Abstract(s)
Currently, there is special interest in the recovery of polyphenols from non-compliant fruits that have no market value; e orts to find value-added solutions for these food areas are a key option for a sustainable bio-economy. Saco cherries are a traditional Portuguese cherry variety, and although they are a nutritionally important food, rich in powerful dietary polyphenols, significant amounts of these cherries are not sold due to their small size. In this context, this work aimed to select the best method to produce novel antioxidant polyphenol-rich extracts from low calibre and non-compliant Saco cherries. Based on the results, microwaves-assisted extraction (MAE) allowed us to obtain a polyphenol-rich extract with a high antioxidant capacity (50.46 + 1.58 mg Trolox equivalent (TE)/g dry extract (DE) by oxygen radical absorbance capacity (ORAC), 10.88 + 0.38 mg ascorbic acid equivalent (AA)/g DE by 2-azinobis-3-ethylbenzothiazoline-6-sulphonic acid (ABTS), and 9.58 + 0.42 mg TE/g DE by 2,2-diphenyl-1-picrylhydrazyl (DPPH)) and a high content of
polyphenols, namely, hydroxycinnamic acids (neochlorogenic and p-coumaric acids) and anthocyanins
(cyanidin-3-rutinoside and cyanidin-3-glucoside), compared with those of conventional extractions
with low and high temperature and ultrasound-assisted extraction. The antioxidant extract produced
from MAE could be a new alternative for the valorisation of non-compliant cherries since these
extracts proved to be a functional ingredient due to the high content of antioxidants, which are linked
to the prevention of diseases.
Description
Keywords
Saco cherry Non-compliant Polyphenols Antioxidant activity Extraction method
Pedagogical Context
Citation
Vilas-Boas, A. A., Campos, D. A., Nunes, C., Ribeiro, S., Nunes, J., Oliveira, A., Pintado, M. (2020). Polyphenol extraction by different techniques for valorisation of non-compliant portuguese sweet cherries towards a novel antioxidant extract. Sustainability, 12(14), art. n.º 5556
Publisher
MDPI