Journal
FOOD CHEMISTRY
Volume 234, Issue -, Pages 445-454Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2017.05.010
Keywords
Polyphenoloxidase; Gentisic acid; Cyaniding-3-O-glucoside; Inhibition mechanism; Conformation; Molecular docking
Funding
- National Natural Science Foundation of China [31460435]
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Gentisic acid and cyanidin-3-O-glucoside are important bioactive polyphenols which are widely distributed in many fruits and cereals. In this work, kinetic study, spectral analysis and computational simulation were used to compare the inhibitory effects and inhibition mechanisms of gentisic acid and cyanidin-3-O-glucoside on mushroom polyphenoloxidase (PPO). The inhibitory effect of cyanidin-3-O-glucoside on PPO was much stronger than that of gentisic acid. Gentisic acid inhibited PPO in a reversible mixed-type manner while cyanidin-3-O-glucoside was an irreversible inhibitor. Gentisic acid and cyanidin-3-O-glucoside made the thermal inactivation of PPO easier, and induced apparent conformational changes of PPO. Compared with gentisic acid, cyanidin-3-O-glucoside had stronger effects on the thermal inactivation and conformation of PPO. Molecular docking results revealed gentisic acid bound to the active site of PPO by hydrogen bonding, pi-pi stacking and van der Waals forces. However, cyanidin-3-O-glucoside might irreversibly interact with the Met or Cys in PPO by covalent bonds. (C) 2017 Elsevier Ltd. All rights reserved.
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