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首页 >> 咖啡專欄 >>咖啡文化 >> 當咖啡粉遇到熱水時就會膨脹，這是爲什麽？

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當咖啡粉遇到熱水時就會膨脹，這是爲什麽？

首先要問，這個氣泡究竟是什麽？

氣泡內的空氣是原本封閉在烘焙豆子裏的二氧化碳，形成氣泡外膜的是蛋白質和多糖體等（形成與濃縮咖啡表面覆蓋的物質相同）。有些人說這些滴濾時産生的氣泡是“雜質”，不過個人認爲這話說的太嚴格，因爲不論是把這些氣泡撈掉還是讓它混合在咖啡液只，都不會對咖啡的味道造成很大的影響。

熱水注入咖啡粉是産生的氣泡有些極爲細膩，有些很大，也有些似乎不會産生的氣泡，這是因爲二氧化碳出現的方式後天。

剛烘焙好的咖啡豆含有大量的二氧化碳，馬上研磨用使用的話，注入熱水時經常會冒出較大的氣泡。個人認爲這不是壞事，不過二氧化碳會妨礙熱水與咖啡粉的接觸，影響到萃取。如此一來即使您總是以相同的方式煮咖啡，有時咖啡會變得比平常，必須小心，一般常聽咖啡豆烘焙好先靜置一晚上，等味道穩定了再使用，我想就是基于這個原因吧。

其次，當注入熱水時咖啡粉沒有膨脹就是咖啡豆不新鮮了嗎？

沒有出現氣泡或是咖啡粉的膨脹程度較低等情況，即發生在二氧化碳含量較少的時候。也有說法認爲“咖啡不會膨脹就表示豆子不新鮮”。烘焙好的咖啡豆放置一段時間之後，二氧化碳的含量確實比較少，因此之候。二氧化碳的含量的確減少，因此這種說法不一定是全錯，不過也有時候不是因爲這個原因，包裝時如果裝進吸收收二氧化碳的幹燥劑，或是把熱水慢慢注入粗磨的咖啡粉，或是熱水溫度偏低等，也會出現同樣的情況。

所以說當注入熱水時咖啡粉膨脹的原因有很多，這個還需要多點練習積累更多的經驗。

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