The change of yacon tuber antioxidant compounds and antioxidant activity affected by storage temperature
Yacon tuber is one kind of tropical high mountain fruits with rich nutrition and health care function. However, it's not resistant to storage. The change of contents of antioxidant compounds and antioxidant activity of yacon tubers affected by storage temperature were studied in the paper. The results showed that, the contents of total phenolic acids, flavonoids and reduced Vc content decreased significantly in the storage. Especially in the first 14 days, decline rate is lager, then gently. The similar phenomenon appeared again for scavenging hydroxyl free radical capacity of yacon tuber extracts. Moreover, according to results, 4 ℃ was the optimal storage temperature, followed by 0 ℃ and 10 ℃, just for yacon tuber antioxidant compounds and antioxidant activity.