Carbonic anhydrase 1 is an enzyme that in humans is encoded by the CA1 gene. Carbonic anhydrases are a large family of zinc metalloenzymes that catalyze the reversible hydration of carbon dioxide.
It is becoming more common that the latte macchiato will have a layer of milk foam on the top of the drink as well. A latte is steamed milk, espresso, and a 1/4 inch of foam ontop. It is prepared in this order: flavored syrup (if applicable), espresso, steamed milk, topped with 1/4 inch of foam.
Microfoam makes the macchiato. Now, see, microfoam is the kind of quality foam we want in a cappuccino or a latte, and while it might be harder to create with skim milk, it's most definitely possibleâand muy appreciated by skim drinkers most of the time.