2.3.7 Oxygen InfluenceOxygen amplifies the impact of anthocyanin degradation processes (Cavalcanti et al., 2011). Specifically, this can take place through a direct oxidative mechanism or through the action of oxidising enzymes such as polyphenol oxidase (PPO). For example, PPO catalyses the oxidation of chlorogenic acid to chlorogenoquinone, which reacts with anthocyanins to form brown condensation products (Patras et al., 2010). It was reported that oxygen-restricted atmospheres best retained initial antioxidant capacity and anthocyanin content of fresh-cut strawberries over a period of cold storage (Odriozola-Serrano, Soliva-Fortuny, & Martín-Belloso, 2009). Although Zheng, Wang, Wang, and Zheng (2003) reported that oxygen from 60-100% increased anthocyanin content of freshly harvested blueberries in the initial period of cold storage (0-7 days), they later reported that a similar effect in strawberries decreased with prolonged storage (Zheng et al., 2007).
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