“…However, the exact mechanism underlying the antioxidant activity and the structure–antioxidant activity relationship of peptides are not fully understood. Even so, many studies have shown that these antioxidant peptides are capable of scavenging free radicals (Gallego, Mora, & Toldrá, 2018; Gaspar‐Pintiliescu et al., 2020; Solieri et al., 2015; Tkaczewska et al., 2019), lipid peroxidation (Ayyash, Liu, et al., 2019; Jemil, Mora, et al., 2016; Tonolo et al., 2019), reducing ferric ion (Fe 3+ ) to ferrous ion (Fe 2+ ) (Cao et al., 2019; Jemil, Mora, et al., 2016; Tkaczewska et al., 2019), and chelating the transition of metal ions (Jemil, Mora, et al., 2016; Tkaczewska et al., 2019; Yu et al., 2020). As compared to the parent proteins, peptides exert greater antioxidant activities due to the higher accessibility of the functional site chain (R‐group) to the reactive species and the electron‐dense peptide bonds (Siow & Gan, 2016).…”