紫色蔬菜原来有那么多秘密

20140507 科技苑 紫色蔬菜原来有那么多秘密:

花青素 是紫色。
+ 酸 = 红色
+ 碱 = 蓝色

抗自由基, anti-oxidant, 防癌。

酢漿草 是可以吃的野菜。
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