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Abstract
Extraction efficiency of total polyphenols and flavonoids from bark oak (Quercus robur L.) grown in the central region of Poland was evaluated. The total phenolics of water and 60% ethanol and extracts were in the range of 55.4–60.4 and 71.0–79.3 mg gallic acid/g of bark, respectively, while the total flavonoid content in these extracts were determined in the range of 35.1–38.0 and 72.0–78.4 mg catechin/g. The hydroalcoholic extracts exhibited higher DPPH radical scavenging activity than BHT (butylated hydroxytoluene), popular food additives.
Highlights
Bark is known to accumulate large amounts of polyphenolic compounds which exhibit a wide range of biological effects, including antioxidant, antibacterial and anti-inflammatory activity (Ferreira et al 2015; Dedrie et al 2015)
The aim of this study was to evaluate the extraction of major classes of polyphenolic compounds from bark oak (Quercus robust L.) grown in the central region of Poland along with the DPPH radical scavenging activity of these extracts
For the determination of total flavonoid content, 1 mL of a sample was mixed with 0.3 mL of N aNO2 (5%, w/v) and after 5 min 0.5 mL of AlCl3 (2%, w/v) was added
Summary
Bark is known to accumulate large amounts of polyphenolic compounds which exhibit a wide range of biological effects, including antioxidant, antibacterial and anti-inflammatory activity (Ferreira et al 2015; Dedrie et al 2015). Oak bark due to its valuable chemical composition, has been used in traditional medicine for the treatment of wounds and skin diseases. Abundant and inexpensive materials, such as residues of wood transformation, represent a promising source for natural antioxidant substances (Bouras et al 2015; Jung et al 2016; Lazar et al 2016). The aim of this study was to evaluate the extraction of major classes of polyphenolic compounds from bark oak (Quercus robust L.) grown in the central region of Poland along with the DPPH radical scavenging activity of these extracts
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