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Anthocyanins in blueberries grown in hot climate exert strong antioxidant activity and may be effective against urinary tract bacteria

Abstract : Anthocyanins are extensively studied for their health-related properties, including antibacterial activity against urinary tract infections (UTI). Among common fruits, blueberries, with their remarkable antioxidant capacity, are one of the richest sources. Anthocyanin-rich extracts were obtained from four varieties: Snowchaser, Star, Stella Blue and Cristina Blue, grown in the hot climate of Southern Spain. Their total anthocyanins contents (TAC) were determined spectrophotometrically, and the anthocyanin profile by ultra high performance liquid chromatography-tandem mass spectrometer (UHPLC-MS/MS). Their antioxidant activity was assessed by oxygen radical absorbance capacity (ORAC) assay, while antibacterial activity against strains isolated from UTI patients was assessed in vitro, helping to select the varieties with the highest bioactive potential. Star showed the highest TAC and antioxidant activity (1663 +/- 159 mg of cyanidin-3-O-glucoside (cy-3-O-glu) equivalents/100 g fresh weight (FW), 6345 +/- 601 mu mol Trolox equivalents (TE)/100 g FW, respectively), followed by Cristina Blue, Stella Blue and Snowchaser. As far as we know, this is the first time that cyanidin-3-rutinoside has been identified in blueberries. The extracts inhibited all the tested strains, MICs ranging from 0.4 mg/mL (for Stella Blue extract against UTIP. aeruginosa) to 9.5 mg/mL (for all extracts against UTIK. pneumoniaessp.pneumoniae). This is the first study that assessed in vitro the antibacterial activity of blueberries againstKlebsiella pneumoniae,Providencia stuartiiandMicrococcusspp. strains isolated from UTI.
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Submitted on : Friday, March 19, 2021 - 3:58:27 PM
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Ana Cerezo, Giorgiana Cătunescu, Mercedes Martínez-Pais González, Ruth Hornedo-Ortega, Carmen Pop, et al.. Anthocyanins in blueberries grown in hot climate exert strong antioxidant activity and may be effective against urinary tract bacteria. Antioxidants , MDPI, 2020, 9 (6), pp.1-22. ⟨10.3390/antiox9060478⟩. ⟨hal-03174940⟩

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