Instant yeast is another type of dry yeast that was introduced after active dry yeast in the 1970s. It is made using a similar process as active dry yeast, although is dried more quickly. As you can see, this yeast is also milled into finer particles. Because of this, it dissolves faster and activates quickly. But unlike active dry yeast, instant yeast doesn't have to be proofed first; it can be mixed straight into the dry ingredients with the same result.
This yeast also gives you two separate rises and it can be used interchangeably with active dry yeast.
Instant yeast is very similar to active dry yeast, but formulated to dissolve more quickly.
http://whatscookingamerica.net/Bread/yeastbreadtip.htm
1 teaspoon instant (bread machine) yeast = 1 1/4 teaspoon active dry yeast.1 teaspoon active dry yeast = 3/4 teaspoon instant yeast.1 package instant yeast (2 1/4 teaspoons or 7 grams) = 1 1/4 package active dry yeast (2 4/5 teaspoons or almost 9 grams).Hope this helps!
You can use active dry yeast as a substitute for instant dry yeast. However, you will need to dissolve it in warm water before adding it to your recipe. Another option is using fresh yeast, but be sure to adjust the quantity as it is not as concentrated as dry yeast.
Yes, except Lallemand/Danstar does not recommend proofing after rehydration of their yeast because they have optimized their yeast's nutrional reserves.
No, yeast is a living organism (bacteria). If you boil it, you will kill it and it will not transform the sugar into alcohol, making it useless.
If by dried you mean instant dry active you would use half the amount. So 7.5 grams.
any supermarket in the spice aisle
Just use one packet of whatever you have - all of the packets contain the same amount. Active Dry Yeast, Instant Yeast, Rapid Rise Yeast, Fast Rising Yeast or Bread Machine Yeast are all the same. They just have different names. If your yeast is in a jar - use one level teaspoon.
Regardless of the form, yeast should always be started in a liquid before adding it to what you are making. Gets it started working and makes it easier to distribute in the mix.
Fresh compressed yeast has half of the rising power of dry. You can cut the amount in the recipe by half or double it depending on what you have and what the recipe calls for. (Note: Most cookbooks for home use refer to dry yeast for recipes unless otherwise stated in the recipe or Preface)
Instant yeast is a dry yeast developed in the past thirty years. It comes in smaller granules than active dry yeast, absorbs liquid rapidly, and doesn't need to be hydrated or "proofed" before being mixed into flour. Bread Machine Yeast is instant yeast that may include ascorbic acid, a dough conditioner. You can use them interchangeably.
Yeast is a living organism. There are thousands of different yeast micro-organisms, but the one most commonly used in baking is Saccharomyces cerevisiae. If you purchase active dry or instant yeast, there may be other ingredients, commonly ascorbic acid. SAF instant yeast also contains sorbitan monostearate. If you are inquiring because of food allergies or concern about additives, be sure to check the label.