如何判断碎牛肉是否变质

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牛肉碎 是一种用途广泛的食材，汉堡、 墨西哥玉米卷 、 意大利面 等料理都会用到它。如果冰箱里放着一盒牛肉碎，但你不知道还能不能用，那就不妨用下面介绍的方法来检查牛肉碎是否变质。记住，变质的肉类千万不能食用！

方法 1
方法 1 的 2:

检查牛肉碎的外观

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    新鲜牛肉碎呈鲜红色，但肉碎中间也可能有些棕色的点，这是因为牛肉来自牛身体不同的部位。储存时间越长，牛肉就会变得越灰。如果牛肉全部变成灰色，不再是红色或棕色，那最好还是把它扔掉吧。 [1]
    • 预先包装好的牛肉碎里面是棕色的，因为氧气不能到达牛肉中心。
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    新鲜牛肉有少许气味，但是开始变质的牛肉会散发腐臭味或酸味。这种气味是牛肉里的部分细菌产生的。如果牛肉闻起来有强烈的臭味，那就赶快把它扔掉。 [2]
    • 很多引起食源性疾病的细菌会出现在新鲜牛肉中，但用鼻子闻不出来，比如沙门氏菌。所以牛肉必须彻底做熟才能将细菌完全杀死。如果你感觉牛肉有问题，还是把它扔掉吧。
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    把牛肉放在手指间捏一捏，仔细感觉。新鲜牛肉一捏就会碎成小块。摸起来黏腻的牛肉很可能已经变质了。 [3]
    • 接触牛肉前后你都必须洗手，避免传播细菌或者污染其它物品。
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    生牛肉碎超过保质期的一到两天内还是可以放心食用。确定牛肉过期的天数，如果超过保质期时间太久了，那就得把牛肉扔掉了。 [4]
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方法 2
方法 2 的 2:

正确存储牛肉碎

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    如果牛肉马上要烹调，就把它放在冰箱冷藏区。在室温下，牛肉会在2小时内开始滋生有害细菌。所以肉放在室温中的时间千万不要超过2小时，如果室温在32℃以上，肉放置的时间不能超过1小时。
    • 如果你不打算立即烹调，那就把肉冻起来。
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    如果牛肉一直在冰箱中冷藏，只要在保质期两天内，牛肉还是新鲜的，可以安全食用。所以牛肉买回家后要立即用掉，以免造成浪费。 [5]
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    把牛肉碎放在可用于冷冻的塑料保鲜袋中，把包装盒上的保质期写在袋子上。封口前把袋子里的空气完全挤出来，这样可以节省冷冻室的空间。 [6]
    • 几个月后，你会发现牛肉上出现白点。如果白点数量不多，切掉就是了。如果白点很多，还是把肉扔掉吧。
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    提前1到2天把冷冻牛肉转移到冷藏区，给牛肉充分的时间解冻。如果你想在水槽中解冻牛肉，就把水槽灌满冷水，然后放入牛肉。每过30分钟换一次水，直到牛肉完全解冻。 [7]
    • 用水解冻的牛肉必须立即用于烹饪。
    • 绝对不要把肉放在室温中解冻。
    • 牛肉可以用微波炉解冻，但是解冻后要立即做熟，以避免牛肉受到污染。
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    杀死牛肉中细菌的唯一方法是把牛肉彻底做熟。烹饪过程中，用肉类温度计检查牛肉内部温度。 [8]
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    熟牛肉可以在冷藏区中安全存放7天，但7天后就会开始变质。熟牛肉也可以放在冷冻区，8个月内必须吃完。注意，牛肉必须先装在密封容器里，然后再放入冰箱。
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警告

  • 冷食的储藏温度在4℃以下，热食的储藏温度在60℃以上。任何介于这两个临界点之间的温度都在“危险区”范围内，很容易导致食物滋生细菌。
  • 接触生牛肉后你一定要洗手，这样才不会污染其它物品。
  • 烹饪牛肉时，牛肉的内部温度必须达到70℃。
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参考

  1. ↑ https://youtu.be/ccIIKEtI1DM?t=29s
  2. ↑ https://www.thespruceeats.com/is-your-ground-beef-spoiled-4049538
  3. ↑ https://www.eatbydate.com/proteins/meats/beef-shelf-life-expiration-date/
  4. ↑ https://www.eatbydate.com/proteins/meats/beef-shelf-life-expiration-date/
  5. ↑ https://www.eatbydate.com/proteins/meats/beef-shelf-life-expiration-date/
  6. ↑ https://www.eatbydate.com/proteins/meats/beef-shelf-life-expiration-date/
  7. ↑ https://www.fsis.usda.gov/wps/portal/fsis/topics/food-safety-education/get-answers/food-safety-fact-sheets/meat-preparation/ground-beef-and-food-safety/CT_Index
  8. ↑ https://www.fsis.usda.gov/wps/portal/fsis/topics/food-safety-education/get-answers/food-safety-fact-sheets/meat-preparation/ground-beef-and-food-safety/CT_Index

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