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切了的梨子放久了会变黑为什么
更新时间: 2020-06-30 00:00:00  

梨变黑变影响了食物的外观,使外层的营养成分有所降低,但可食用。梨削皮后放置时间较长,植物细胞在空气中氧化分解作用加剧,则梨外层的营养物质分解较多,果胶物质在酶的作用下进一步分解为果胶酸和甲醇,使得果肉松散、湿润、变色、变味,甚至腐烂变质。

关键词: 梨子 为什么

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