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  • 食品的保質期越長防腐劑就越多?

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           任何正規的食品包裝上都會標有該食品的保質期,然而很多人認為食品的保質期越長,添加的防腐劑就越多。那么,保質期指的是什么?哪些因素決定了食品保質期?食品保質期長短和防腐劑添加量之間存在關系嗎?

      據《北京晚報》報道,保質期是指產品的最佳食用期。產品保質期由生產者提供,標注在限時使用的產品上。有了這個標識,消費者就知道這個食品在什么時間之前食用是最佳的。對于一般的產品來說,其標注的保質期會小于實際會出現問題的天數。

      那么,哪些因素決定了食物的保質期呢?國家二級營養師范琳琳在接受人民健康網采訪時表示,決定食品的保質期有內部因素和外部因素。內部因素包括水分含量、含糖量、含鹽量等,比如蜂蜜、泡菜、醋、酒等食物,由于本身就是高糖、高鹽或者高酸的食品,食材本身就有抑制生物菌群的作用,所以能夠大幅度延長保存時間;外部因素則包括食品的包裝和生產工藝,比如常溫奶、罐頭、飲料等食品,通過真空、密封、殺菌包裝,同樣可以無防腐劑添加而長期存放,以牛奶為例,《北京晚報》介紹,有些牛奶類產品保質期較長,這是由于這類牛奶制品采取高溫滅菌和真空包裝的方式,隔絕了氧氣。

      綜上所述,食品保質期長短和防腐劑添加了多少并沒有必然的關系。另外,中國農業大學食品科學與營養工程學院副教授范志紅在接受《健康時報》采訪時解釋,食物的保質期期限說的是在適宜的貯存條件下,也就是說如果你的貯存條件沒能滿足食物的儲藏需要,食物的保質期可能會縮短。如封裝食品開封前都經過了食品殺菌,所有致病菌、腐敗菌和絕大部分微生物都被“處決”,使食品符合保質期要求。但食品一旦開封,細菌便會極速侵入,使得食品保質期基本“無效”,比如番茄醬開封后若三天沒有吃完,則很容易變質,這時候保質期這回事也就不復存在了。因此食品包裝開封后,真正的食品保質期將會迅速縮短,要盡早食用。

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