TY - JOUR AU - Mikyška, Alexandr AU - Jurková, Marie PY - 2019/11/29 Y2 - 2024/03/28 TI - Varietal specificity of polyphenols, free phenolics and antioxidant potential in hops JF - KVASNY PRUMYSL JA - KP VL - 65 IS - 6 SE - DO - 10.18832/kp2019.65.178 UR - https://kvasnyprumysl.eu/index.php/kp/article/view/194 SP - 178–185 AB - <p>&nbsp;Many studies have confirmed hops (Humulus lupulus L.) as the source of a number of physiologically active polyphenols, important for both brewing and potentially pharmaceutical purposes. The three-year screening of polyphenols and 23 free phenolics profile (HPLC/coulometric detection) showed a significant association of polyphenols and free phenolics with DPPH antioxidant potential and the genetically determined specificity of free phenolics composition in hops. Varieties of American origin have a different profile compared to European varieties. For the first time, the free phenolics hydroxycoumarins were detected in hops. The DPPH strongly correlated with total polyphenols and flavanoids (n = 95, r = 0.92, 0.93 respectively) and correlated negatively with alpha acids (n = 95, r = -0.73). The polyphenols and the DPPH decrease with increasing alpha acids both among varieties and within one variety. These findings can serve as a useful tool for hop selection in brewing or pharmaceutical production.</p> ER -