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7891278 
Journal Article 
Assessment of polyphenol content and antioxidant activity of oak bark extracts 
Drozdz, P; Pyrzynska, K 
2018 
Yes 
Holz als Roh- und Werkstoff
ISSN: 0018-3768
EISSN: 1436-736X 
Springer Verlag 
76 
2 
793-795 
English 
WOS:000423831100038 
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. © 2017, The Author(s).