Galla rhois water extract inhibits enzymatic browning in apple juice partly by binding to and inactivating polyphenol oxidase
2022
Lee, Min-Kyeong | Hwang, Youn-Hwan | Ryu, Heeyeon | Lee, Ami | Jeong, Hyeon Hak | Baek, Jiwon | Kim, Myeong-Jin | Lee, Ji Yun | Van, Ji Yun | Liu, Yunshan | Choi, Chun Whan | Kim, Min-su | Lee, Bonggi
Although Galla rhois has been used as a traditional medicine in Asian countries, there was no application of it in anti-browning food additives. Here, we tested whether Galla rhois inhibits apple juice browning. Apple juice browning was blocked at 250–1000 µg/ml of Galla rhois for 16 days but the effect of vitamin C did not last until a day. In vitro assays showed that the antioxidant capacity of Galla rhois was stronger than that of vitamin C. Further analysis by UPLC-MS/MS identified 17 phytochemicals containing gallotannin derivatives. Docking simulation and polyphenol oxidase activity assay indicate that the mechanisms underlying Galla rhois-mediated inhibition of the enzymatic browning include but are not limited to the combined effects of multiple compounds including galloylglucose- and gallate-derivates. Although marketability and long-term toxicity of Galla rhois should be tested, it may be applied as a food additive to elevate food quality.
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