碳酸氫銨(Ammonium bicarbonate)
是氨的碳酸鹽,分子式為NH4HCO3。
應用
在小蘇打出現之前,碳酸氫銨在食品工業中作為膨鬆劑(Leavening agent)(例如,薑餅(gingerbread)或中國的油條)。除了小蘇打之外,碳酸氫銨仍然在許多食品中使用。許多烘焙食譜(尤其是來自斯堪地納維亞)可能仍稱它為鹿角精(hartshorn)或hornsalt [1][2]。它可以被小蘇打所取代。[3]
在中國,碳酸氫銨被通常當作一種平價的氮肥使用,但目前已逐漸被尿素所取代,因為後者較前者廉價且穩定。這種化合物被用作滅火化合物、醫藥、染料和顏料產品的一種成份,它也是一種提供氨的基本肥料。碳酸氫銨仍然在塑膠和橡膠工業、陶器製作、鉻鞣革和合成催化劑上被廣為使用。
碳酸氫鈉(Sodium bicarbonate)
http://en.wikipedia.org/wiki/Sodium_bicarbonate
Cooking
Sodium bicarbonate is primarily used in cooking (baking) where it reacts with other components to release carbon dioxide, that helps dough "rise". The acidic compounds that induce this reaction include phosphates, cream of tartar, lemon juice, yogurt, buttermilk, cocoa, vinegar, etc. Hence, sodium bicarbonate can be substituted for baking powder provided sufficient acid reagent is also added to the recipe.[3] Many forms of baking powder contain sodium bicarbonate combined with one or more acidic phosphates or cream of tartar.