Abstract
The research aimed to evaluate the polyphenolic composition and the antioxidant capacity of edible extracts of feijoa (Acca sellowiana (O. Berg) Burret) flowers. Phenolic compounds of whole feijoa flower (FM), feijoa petals (PM) and feijoa petals juice (PJ) were identified by high-performance liquid chromatography coupled with electrospray mass spectrometry and quantified by liquid chromatography coupled with ultraviolet/visible detection. Moreover, the total polyphenol (TP) content was measured spectrophotometrically and the antioxidant capacities of the extracts were evaluated by FRAP, CUPRAC, DPPH·, and ABTS·+ assays. The FM showed TP content (395.14 ± 7.91 mg GAE/L) higher than PM and PJ, and exhibited better antioxidant capacities. FM extracts were characterized by the high content of anthocyanins (115.3 ± 3.6 mg/L), flavonols (42.9 ± 3.3 mg/L) and the presence of ellagic acid (7.9 ± 0.2 mg/L) and other galloyltannins. In addition, cyanidin-3-O-glucoside and apigenin were detected in all the three extracts. The present study provided an overview on particular bioactive compounds that characterise different parts of edible feijoa flowers. Among the latter, FM proved to be the most suitable for exploitation in the food and health manufactory.
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Acknowledgements
This work was partially supported by the Fondazione di Sardegna under the project “Innovative antioxidant molecules for the food and health industry” (CUP F71I17000180002). The authors thank Dr. Angelo Farris and Dr. Anna Mereu for supplying samples, and Dr. Lorenzo Melis for helpful discussion.
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Montoro, P., Serreli, G., Gil, K.A. et al. Evaluation of bioactive compounds and antioxidant capacity of edible feijoa (Acca sellowiana (O. Berg) Burret) flower extracts. J Food Sci Technol 57, 2051–2060 (2020). https://doi.org/10.1007/s13197-020-04239-2
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DOI: https://doi.org/10.1007/s13197-020-04239-2