The Fresh Loaf

News & Information for Amateur Bakers and Artisan Bread Enthusiasts

Yeast Types

JeffO's picture
JeffO

Yeast Types

Hi,

Can someone explain the different types of yeast (or point me to somewhere that does).  For example is rapid rise yeast the same as instant yeast? The active yeast that is bought in jars - does that need to be started in water? I'm sure this has already been explained somewhere so I'd love to read about it.

 

Thanks

Jeff

 

Floydm's picture
Floydm

There is a bit about it here:

http://www.thefreshloaf.com/faqs/baking/yeast

Active dry typically needs to be activated, instant (aka rapid rise) does not.

sphealey's picture
sphealey

The one that artisan breadmakers typically want to avoid is "rapid-rise yeast". Which, contrary to what many references state, is NOT the same as the "instant yeast" that Floydm recommends. Rapid-rise yeast has additional chemicals added to make it rise, well, rapidly, but it dies faster as well and doesn't work for multiple risings.

 

In the US, jars of "bread machine yeast" are usually instant yeast.

 

So go with "instant" or "bread machine", unless you want to get all traditional with moist yeast. But none of my local grocery stores even carry moist yeast anymore.

 

Personally I think the yeast makers have too many types of yeast - it puts people off. They should stick with moist and instant. I have never had a problem getting instant to rise as fast as I need it to if artisan flavour is not a concern.

 

sPh

Willard Onellion's picture
Willard Onellion

From Tom Lehmann on Pizza Today:

First, there is compressed yeast, also known as wet yeast (or sometimes brick yeast due to the fact it is commonly sold in one-pound bricks).

Yeast in this form is alive and potentially ready to begin feeding and producing all of those useful byproducts we discussed last month. It only needs to be warmed to a temperature of 50 F or more to get this yeast activated and feeding. This is the reason why the yeast must be kept refrigerated at all times.

This is also the type of yeast for which the old admonishment-never allow the yeast to come into direct contact with either salt or sugar-was developed.

What happens here is if the yeast is allowed to contact salt or sugar, either of the two substances will draw the moisture out of the yeast, thus damaging it to a point where it may lose its fermentative properties. In some instances, the yeast may actually be killed.

For this reason, fresh yeast is best used when making fresh dough on a regular basis. It is also widely used by those manufacturers who produce frozen dough. The reason for this is that the yeast cells will be in excellent condition, provided the yeast has not been temperature abused.

Having the cells in undamaged condition allows the production of the highest quality frozen dough. By high quality, I am referring to frozen dough with a shelf life of 19 weeks or more.

The next type of yeast we commonly see is instant, active, dry yeast, also known as instant yeast (it's often abbreviated to IDY).

This type of yeast is unique in that it is either dried and vacuum packaged, or packaged with an inert gas flush. This is what gives the instant yeast its excellent, long shelf life of one to two years, depending upon the manufacturer.

Have you ever wondered about the word "instant" associated with this product? Instant refers to the rate at which this type of yeast absorbs water. If you could look at each one of those rods of yeast under a microscope, you would see that each one has the characteristics of a sponge: many openings, holes and voids that allow water to readily come into contact with the yeast, thus allowing it to hydrate.

This feature allows the instant yeast to simply be put into dough, along with all the other ingredients, without pre-hydration. The fact the yeast is dry allows it to be used in dry mixes for pizza dough or in goody bags containing salt and sugar. Remember, the yeast is dry so there will be no affect of the salt and sugar on the yeast. Just be careful that you don't try to pre-hydrate a goody bag containing salt, yeast and sugar before adding it to the flour.

The third type of yeast we see commonly used is active dry yeast, or ADY.

Active dry yeast must be hydrated before it can be added to the flour. In pre-hydrating active dry yeast, it is very important that warm water be used. Most manufacturers will specify a temperature between 100-105 F. The ADY is then sprinkled into the water and stirred thoroughly, using a hand whisk or a spoon to suspend the yeast in the water.

After stirring, it is important to wait about 10 minutes. During this time the yeast will hydrate, become active and begin producing byproducts, which we will see as small bubbles of CO2 (or even froth on the surface of the yeast suspension). At this point you know the yeast is fully active and ready to be added to the mix.

It is good to remember that you now have wet yeast, which again should not be allowed to come into direct contact with salt or sugar, but you can put it into the mixer along with your other ingredients and immediately begin mixing.

While we are on the subject of talking about warm water, have you ever wondered why the water must be warm?

When the yeast is dried, the cell membrane shrinks, much like a grape will shrink when it is dried into a raison. In addition to shrinking, small cracks, or fissures, also form on the surface of the yeast cells. If the dry yeast were put into cold water, the yeast would hydrate very slowly, allowing the fissures to open up during the hydration process and allow for a flushing effect upon the yeast cells. When warm water is used, the yeast cells hydrate much more rapidly and allow the cracks and fissures to seal themselves, thus preventing the flushing effect.

Earlier, I had mentioned that compressed yeast is the most commonly used in frozen dough and I explained that fresh yeast generally has yeast cells that are in better condition than dried yeast cells. This is not meant to say that compressed yeast is any better than dried yeast, but the fact remains that when subjected to the drying process, either ADY or IDY will have some of the yeast cells damaged to the point of inactivation by the drying process.

These dead yeast cells can create a problem in a frozen dough system. Through the release of a material called glutothione, which is very similar to L-cysteine (the active ingredients in PZ-44), these dead cells can create a softening effect on the dough, especially as the dough ages under frozen storage. The combined dough softening and potential loss of yeast activity due to freezing is the main reason most frozen dough manufacturers elect to use compressed yeast over dry forms.

It should be kept in mind that if you are a small producer of frozen dough-or operate a commissary producing frozen dough-in all likelihood you may not see any difference in the performance of your frozen dough whether it is made with IDY or fresh compressed yeast.

Willard Onellion's picture
Willard Onellion
qahtan's picture
qahtan

 

 I interchange the yeast some times I use instant yeast some time fresh,  fresh gives just that little difference in taste.     Try both and see which you prefer..........qahtan

Lisa Sun's picture
Lisa Sun

Dried yeast is one of the wonders of modern baking – a pourable granular powder made from millions of millions of dehydrated unicellular organisms. After hydration, these small critters munch on the sugar or starch in a dough, producing alcohol and carbon dioxide, which give the bread its distinctively fermented taste and its airy rise.

Successful resurrecting of dry yeast depends entirely on the processing. So if a recipe requires a certain type, the instructions are tailored to their specific needs. These instructions can kill another type of dry yeast, or they fail to create the conditions for it to thrive, causing doughs to rise poorly – or doughs that do not even brew. This means that it is important for bakers to understand the language used to describe the different types of dry yeast and to realize that blind substitution is a crapshoot at best. Some recipes, especially high-moisture dough and short post-fermentation, can provide a hospitable environment for many types of yeast and create a false sense of security around substitution.

dry yeast

 Active Dry Yeast VS Instant Dry Yeast

Bread baking can be complicated, which is partly due to all variables when using yeast. There are several types of yeast that you can use in baking, but two of the most common are active dry yeast and instant yeast, also called rapid rise yeast. Instant Yeast and Active Dried Yeast include some of the same preparation steps, but your overall baking time gets shorter with Instant Yeast as it can significantly shorten the time it takes for the dough to rise.

Active-dry-yeast-vs.-Instant-Dry-Yeast

Active Dry Yeast

As the name implies, active dry yeast must be “activated” by dissolving the granules in warm water according to the packing instructions. (The peculiarities may vary from brand to brand, in some cases, sugar can be added as fuel for the yeast.) When the yeast is still alive, it will start to foam and grow within a few minutes.

active-dry-yeast

Active dry yeast is so unstable that any given packet may be dead. You must, therefore, check whether it is still alive or not before proceeding with the recipe, even if the yeast has not yet reached the expiration date stated on the package. Active dry yeast also has a comparatively large grain size, further necessitating direct contact with warm water to dissolve. Due to this time-consuming step as well as the high risk of failure and high failure costs, active dry yeast is seldom used in a professional environment. When the yeast is still alive, it starts to foam and grow within a few minutes.

  • Dry yeast is perishable very quickly. Always check the expiry date before use.
  • The effectiveness may vary over time and lead to inconsistent results
  • Must be rehydrated before use
  • Easily damaged by liquids above 46 ° C (115 ° F)
  • Suitable for recipes that require more than one boost
  • Suitable for cold-resistant doughs
Instant Dry Yeast

Thanks to its unique manufacturing process, instant yeast(or rapid-rise dry yeast) is guaranteed to be 100% active and can be used immediately from the packaging. The behavior is constant over time. Due to the small grain size, instant yeast dissolves easily in the ambient moisture of dough, so that no rehydration is required. Because of their stability and shelf life, instant yeast is safe to buy in bulk, dramatically reducing costs compared to the tiny packs of active dry yeast sold in stores.

instant dry yeast

  • Very stable; can be frozen for several years
  • Consistent behavior over time
  • Tolerant at temperatures up to 130 ° F (54 ° C)
  • Suitable for recipes that require more than one boost
  • Suitable for cold-resistant doughs

Comparing the difference between active dry yeast and instant dry yeast, we can find that active dry yeast needs to be dissolved in water in advance when making bread, while instant yeast can be directly mixed into the dough. And in terms of storage, instant yeast is more convenient to store and has a longer shelf life.

Since instant yeast has so many advantages, where can we find it?

FADA yeast, one of the largest instant dry yeast manufacturer in China, focus on baking yeast manufacturing since 2006. The yeast manufacturing companies cover an area of 50,000 square meters, with the annual output capacity 15,000 tons. All of the baker’s yeast production equipment are most advanced and first-class, with fully automatic production lines and sterile management in dry yeast production workshop.

instant dry yeast

Our baker’s yeast is approved by many international food safety and quality certifications, such as CE certification, PSE, UL, SASO, JAS certification, and etc.

If you are interested in instant dey yeast wholesale, welcome to contact us to get the quotation.