Journal
JOURNAL OF BERRY RESEARCH
Volume 9, Issue 3, Pages 431-447Publisher
IOS PRESS
DOI: 10.3233/JBR-190409
Keywords
Anthocyanins; color; polyphenolics; berries; storage; freeze-dried powders
Funding
- Pontificia Universidad Catolica Argentina
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BACKGROUND: Berry fruits stand out for their high contents of anthocyanins responsible for their red-purple color. The region of Patagonia, Argentina, is a significant cultivar region of these fruits. Due to berries' very short shelf-life, it is interesting the development of dehydrated products that can be stored at room temperature and still be a source of bioactive components and natural colorants. OBJECTIVE: The objective of this work was to evaluate the effect of freeze-drying process and storage at 38 degrees C on the levels of bioactive compounds and color, in lyophilized products based on blueberry, blackcurrant, elderberry and maqui berry pulps from the E1 Bolson area, Rio Negro, Argentina. METHODS: Fruit pulps with addition of encapsulating agents (Maltodextrin/Arabic gum) were freeze-dried and evaluated for the content of monomeric anthocyanins, total polyphenols, antioxidant capacity, color (CIELab parameters) and physical characteristics. RESULTS: The obtained freeze-dried powders showed high levels of retention of bioactive compounds, yielding between 68.2 and 99.6% of retention of polyphenols and anthocyanins depending on the fruit. Color parameters were also stable after freeze-drying and during 60 days of storage at 38 degrees C. CONCLUSIONS: The obtained stable powder ingredients based on berries from Patagonia can be used as a source of bioactive compounds and pigments.
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