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鐵鍋炒蓮藕使蓮藕變成暗藍色或暗綠色因為含有一種化學成分

   2011-04-11 中華化工網11800
核心提示:中華化工網訊蓮藕中含有一種化學成分單寧,又稱鞣質。蓮藕被切開和去皮后,暴露在空氣中就會變成褐色。變色的原因是由于氧化作用
中華化工網訊蓮藕中含有一種化學成分——單寧,又稱鞣質。蓮藕被切開和去皮后,暴露在空氣中就會變成褐色。變色的原因是由于氧化作用,單寧中的酚類產生醌的聚合物形成褐色色素,也就是黑色素。

  為了防止變色,可將去皮切開的藕放在清水或淡鹽水中浸泡,使其與空氣隔絕,可防止氧化反應。另外,鞣質變色的另一種原因是與金屬生成深色的鞣質鹽,如遇鐵后變成暗藍色或暗綠色。正是由于這些原因,所以請您炒藕時切忌用鐵鍋,用砂鍋為宜,切藕時最好用不銹鋼刀。

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