“…Many scholars have studied that the enzyme polyphenol oxidase (PPO) is the main enzyme causing the browning of fruits and vegetables (Lei et al, 2018;Mishra, Gautam, & Sharma, 2013;Wang, Zhou, Zhou, Cheng, et al, 2017). In addition, it has been known for a long time that Superoxide Dismutase (SOD), Catalase (CAT), and Peroxidase (POD) activity in reactive oxygen metabolism are also apparently changed when browning occurs during shelf life (Dokhanieh & Aghdam, 2016;Li et al, 2019;Yingsanga, Srilaong, Kanlayanarat, Noichinda, & McGlasson, 2008;Zhang et al, 2019). Damage of membrane integrity is regarded as the main reason that causes the occurrence of browning, which accelerates PPO catalyzing phenol and O2 to quinone (Zhu, Zhou, Zhu, & Guo, 2009).…”