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Radka Vrancheva Ivan Ivanov Ilian Badjakov Ivayla Dincheva Vasil Georgiev Atanas Pavlov

Abstract

The aim of the current study was to optimize the extraction condition of polyphenol compounds with antioxidant properties from leaves of natural grown Vaccinium myrtillus L and Vaccinium vitis-idaea L. The extractions were carried out in ultrasonic bath at 40 ºC for 20 minutes with different solvents (water, 20 % ethanol, 40 % ethanol, 60 % ethanol, 80 % ethanol and 96 % ethanol) and different hydro module of samples and solvents used (1:50, 1:100 and 1:200). The highest total phenol content in the leaves of V. myrtillus L. and V. vitis-idaea L. was found when 40% ethanol extract was used (90.50 ± 0.05 mg GAE/g DW and 96.68 ± 0.05 mg GAE/g DW, respectively). The highest total flavonoid content of the leaves of both species was obtained with 80 % ethanol as extraction solvent. The highest level of total proanthocyanidins were in the 60 % ethanol extract of V. myrtillus L. and in the 80 % ethanol extract of V. vitis-idaea L (13.12 ± 0.11 mg LE/g DW and 24.22 ± 0.21 mg LE/g DW, respectively). The highest ability to scavenge DPPH radicals possessed the 40 % ethanol extracts from the leaves of both species (693.99 ± 4.05 mM TE/g DW for V. myrtillus L. and 1083.18 ± 8.48 mM TE/g DW for V. vitis-idaea L). Data analysis showed that the maximal amount of polyphenols was extracted at a hydro-module of 1: 100. HPLC analysis revealed that the dominant phenolic acid in the leaves of V. myrtillus L was chlorogenic acid (13.45 mg/g DW), while ferulic acid (49.48 mg/g DW) was present at the highest concentration in the leaves of V. vitis-idaea L.

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How to Cite
VRANCHEVA, Radka et al. Optimization of polyphenols extraction process with antioxidant properties from wild Vaccinium myrtillus L. (bilberry) and Vaccinium vitis-idaea L. (lingonberry) leaves. Food Science and Applied Biotechnology, [S.l.], v. 3, n. 2, p. 149-156, oct. 2020. ISSN 2603-3380. Available at: <https://www.ijfsab.com/index.php/fsab/article/view/98>. Date accessed: 26 oct. 2020. doi: https://doi.org/10.30721/fsab2020.v3.i2.98.