Betalains - an overview | ScienceDirect Topics
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火龍果的紅色素betacyanin，和甜菜根的紅色素類似，可溶於水，但不溶於脂肪，加了橄欖油以後，還是不容易(小於1%) 被人體吸收。吃多了，尿液或糞便會呈現紅色。
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