怎么检查泡打粉是否新鲜

泡打粉是一种膨松剂，能促进面团膨胀，所以常用于烘焙。新鲜泡打粉和其它原料混合会发生化学反应，而过期或陈年的泡打粉则不会引起这样的反应，这意味着你在做面包、饼干或其它面食的时候，面团就发不起来。只要存放得当，泡打粉的活性可以维持一年。如果你不确定手头的泡打粉是否新鲜，就在使用前测试一下它的活性。

步骤

测试泡打粉

1. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/d\/d5\/Check-the-Freshness-of-Baking-Powder-Step-1.jpg\/v4-460px-Check-the-Freshness-of-Baking-Powder-Step-1.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/d\/d5\/Check-the-Freshness-of-Baking-Powder-Step-1.jpg\/v4-728px-Check-the-Freshness-of-Baking-Powder-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 1 把自来水烧开。往水壶里注入自来水，让水达到最低水位线。测试泡打粉的活性只需要用1/2杯热水，而只将水加到最低水位线可以确保水壶的加热元件不会干烧过热。按下开关，把水烧开。^[1]
   • 用多少水就烧多少，不然只会白费电。
2. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/f\/fd\/Check-the-Freshness-of-Baking-Powder-Step-2.jpg\/v4-460px-Check-the-Freshness-of-Baking-Powder-Step-2.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/f\/fd\/Check-the-Freshness-of-Baking-Powder-Step-2.jpg\/v4-728px-Check-the-Freshness-of-Baking-Powder-Step-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 2 将泡打粉放入碗中。用量勺取1茶匙泡打粉倒入耐高温的碗、杯子或者盘子里。水烧开后要马上浇到泡打粉上，所以容器一定要能耐高温。
   • 同样的方法也可以用来测试小苏打的活性。^[2]
3. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/9\/95\/Check-the-Freshness-of-Baking-Powder-Step-3.jpg\/v4-460px-Check-the-Freshness-of-Baking-Powder-Step-3.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/9\/95\/Check-the-Freshness-of-Baking-Powder-Step-3.jpg\/v4-728px-Check-the-Freshness-of-Baking-Powder-Step-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 3 取适量水倒在碗里。水壶里的水烧开后，把水倒在容积为1/2杯的量杯里。接着慢慢地把开水从量杯里再倒在泡打粉上。
   • 如果需要测试的是小苏打，而不是泡打粉，倒入开水前，先往水里加1茶匙白醋。如果小苏打还新鲜，白醋里的醋酸就会和小苏打发生反应，激发其活性。^[3]
4. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/4\/4b\/Check-the-Freshness-of-Baking-Powder-Step-4.jpg\/v4-460px-Check-the-Freshness-of-Baking-Powder-Step-4.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/4\/4b\/Check-the-Freshness-of-Baking-Powder-Step-4.jpg\/v4-728px-Check-the-Freshness-of-Baking-Powder-Step-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 4 注意是否有泡沫生成。当和开水接触时，新鲜、有效的泡打粉会立即发出 “嘶嘶”声，同时冒出泡沫。“嘶嘶”或“滋滋”声表示泡打粉还新鲜，可在烘焙中作为膨松剂使用。
   • 泡沫生成得越多，泡打粉的新鲜程度就越高。^[4]

寻找泡打粉的替代品

1. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/b\/b8\/Check-the-Freshness-of-Baking-Powder-Step-5.jpg\/v4-460px-Check-the-Freshness-of-Baking-Powder-Step-5.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/b\/b8\/Check-the-Freshness-of-Baking-Powder-Step-5.jpg\/v4-728px-Check-the-Freshness-of-Baking-Powder-Step-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 1 将泡打粉和塔塔粉混合。泡打粉实际上就是小苏打和干的酸性材料的混合物，所以如果你手头的泡打粉不新鲜，情况又比较紧急，你可以自制泡打粉。为了制作1汤匙泡打粉，你需要将1茶匙小苏打和2茶匙塔塔粉混合并搅匀。
   • 如果你需要用到大量泡打粉，就按照1:2的比例混合小苏打和塔塔粉。没用完的泡打粉要放入密封容器储存。^[5]
2. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/4\/4b\/Check-the-Freshness-of-Baking-Powder-Step-6.jpg\/v4-460px-Check-the-Freshness-of-Baking-Powder-Step-6.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/4\/4b\/Check-the-Freshness-of-Baking-Powder-Step-6.jpg\/v4-728px-Check-the-Freshness-of-Baking-Powder-Step-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 2 将小苏打和白脱牛奶混合。还有一种原料可将小苏打转化为泡打粉，那就是白脱牛奶。这种方法要求将1/2茶匙小苏打和1/2杯白脱牛奶混合。^[6] 如果食谱中本就要求用到白脱牛奶，那这种泡打粉的替代物就再适合不过了。这类食谱包括：
   • 松饼
   • 玛芬蛋糕
   • 饼干
   • 华夫饼
   • 面糊
   • 甜甜圈
3. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/f\/f9\/Check-the-Freshness-of-Baking-Powder-Step-7.jpg\/v4-460px-Check-the-Freshness-of-Baking-Powder-Step-7.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/f\/f9\/Check-the-Freshness-of-Baking-Powder-Step-7.jpg\/v4-728px-Check-the-Freshness-of-Baking-Powder-Step-7.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 3 将小苏打与柠檬汁或醋混合。柠檬汁和醋里都含有酸，能激发小苏打的活性，将其转变为泡打粉。为了完成这一转变，你需要准备1/4茶匙小苏打和1茶匙柠檬汁或醋。上述用量能做出1茶匙泡打粉。^[7]
   • 当你用小苏打混合液体的方法制作泡打粉时，食谱里其它液体原料的用量也要减少与自制泡打粉相同的量。比如，你用柠檬汁和小苏打做出了2茶匙泡打粉，那么食谱中牛奶的用量就要减少2茶匙。^[8]

存放泡打粉

1. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/3\/3e\/Check-the-Freshness-of-Baking-Powder-Step-8.jpg\/v4-460px-Check-the-Freshness-of-Baking-Powder-Step-8.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/3\/3e\/Check-the-Freshness-of-Baking-Powder-Step-8.jpg\/v4-728px-Check-the-Freshness-of-Baking-Powder-Step-8.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 1 用密封容器存放泡打粉。如果储存得当，泡打粉能保存18个月甚至更长时间不变质。在若干储存泡打粉的重要注意事项中，使用密闭容器，将泡打粉与氧气隔离是其中之一。适合的容器包括：
   • 梅森玻璃罐
   • 能盖严的玻璃或塑料容器
   • 带密封盖的金属或陶瓷烘焙罐
2. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/7\/78\/Check-the-Freshness-of-Baking-Powder-Step-9.jpg\/v4-460px-Check-the-Freshness-of-Baking-Powder-Step-9.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/7\/78\/Check-the-Freshness-of-Baking-Powder-Step-9.jpg\/v4-728px-Check-the-Freshness-of-Baking-Powder-Step-9.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 2 在干燥的地方储存泡打粉可延长其保质期。泡打粉如果接触湿气就会结块，使得活性降低。适合用来储存泡打粉的干燥处包括食品储藏间、食品柜，以及其它空气湿度小的地方。不要把泡打粉放在潮湿的地下室，水槽下方，或容易漏水、有水溢出的地方。
   • 潮湿的空气中含有水、酵母和其它元素，所有这些物质都会改变泡打粉的化学成分。如果长期和潮湿的空气接触，泡打粉就会慢慢失效。
3. {"smallUrl":"https:\/\/www.zenmeban.com\/images_en\/thumb\/1\/1a\/Check-the-Freshness-of-Baking-Powder-Step-10.jpg\/v4-460px-Check-the-Freshness-of-Baking-Powder-Step-10.jpg","bigUrl":"https:\/\/www.zenmeban.com\/images\/thumb\/1\/1a\/Check-the-Freshness-of-Baking-Powder-Step-10.jpg\/v4-728px-Check-the-Freshness-of-Baking-Powder-Step-10.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"} 3 把泡打粉存放在凉爽的环境中。还有一种方法能最大程度延长泡打粉的寿命，那就是把它放在远离热源的地方。^[9] 高温可能会激活泡打粉，如果泡打粉一直被存放在干燥的地方，上述情况更容易发生。远离烤箱的食品储藏间或食品柜是存放泡打粉的理想位置。