Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/52388

TitleArbutus unedo L. leaves as source of phytochemicals with bioactive properties
Author(s)Malheiro, Ricardo
Sá, Olga
Pereira, Eric
Almeida Aguiar, Cristina
Baptista, Paula
Pereira, José Alberto
KeywordsArbutus unedo L. leaves
Aqueous extracts
Antioxidant activity
Antimicrobial properties
Total phenols
Issue date2012
PublisherElsevier
JournalIndustrial Crops and Products
Abstract(s)In recent years the strawberry tree (Arbutus unedo L) is being gradually replaced by other species with higher economic value. With the ultimate goal of selecting superior genotypes, the present work was initiated to study the antioxidant and antimicrobial activities, and total phenolic content in 19 different genotypes of A. unedo leaves from the Tras-os-Montes region of Portugal.The genotype Braganca 1 contains higher total phenolic content (215.0 mg GAE/g(extract)) whereas the Vila Boa 4 genotype shows lower total phenolic content (148.0 mg GAE/g(extract)). In both methods tested to evaluate the antioxidant activity, Vila Verde and Donai displayed the highest antioxidant capacity (EC50 values of 0.088 and 0.090 mg/mL, respectively, for DPPH; EC50 values of 0.233 and 0.245 mg/mL, respectively, for reducing power assay) while Vila Boa 2 reported the lowest antioxidant potential (EC50 values of 0.142 and 0.378 mg/mL, respectively, in DPPH and reducing power methods). Linear negative correlations were established between the total phenol contents and the EC50 values for both of the antioxidant activity methods tested. Preliminary assays for antimicrobial potential showed that extracts from A unedo leaves display antibacterial activity, with MIC values of 1 and 5 mg/mL for some Gram-positive and Gram-negative bacteria, respectively. Taken together, the results suggest that A. unedo leaves are a potential source of natural compounds with valuable bioactive properties that could be explored by the pharmaceutical, chemical and food industries.
TypeArticle
URIhttp://hdl.handle.net/1822/52388
DOI10.1016/j.indcrop.2011.07.023
ISSN0926-6690
Publisher versionwww.elsevier.com/locate/indcrop
Peer-Reviewedyes
AccessRestricted access (Author)
Appears in Collections:DBio - Artigos/Papers

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