Yeast
cheap diazepam cheap xenical nokia ringtones qwest ringtones zanaflex online diazepam online verizon ringtones free motorola ringtones order lortab prozac online ericsson ringtones but ortho cheap cyclobenzaprine cheap celexa free ringtones phentermine free cool ringtones cheap prozac free qwest ringtones cialis online sprint ringtones nexium online real ringtones sagem ringtones tracfone ringtones free nokia ringtones free punk ringtones mp3 ringtones sony ringtones ativan online but hgh free midi ringtones alltel ringtones cheap flexeril sony ericsson ringtones motorola ringtones vicodin online free tracfone ringtones buy soma levitra online free motorola ringtones cheap didrex cheap sildenafil pharmacy online online zoloft online hydrocodone online free sony ringtones cingular ringtones viagra buy paxil ambien online buy lortab order hydrocodone vigrx online cheap ativan hgh online sildenafil online buy viagra ortho online nextel ringtones lisinopril free funny ringtones free sony ericsson ringtones buy vicodin hydrocodone order ativan mono ringtones clonazepam levitra free sprint ringtones cialis online sony ringtones cheap levitra zanaflex online phentermine celexa online ultracet online wwe ringtones free sharp ringtones buy norco soma online cheap ultracet free cingular ringtones cheap adipex cheap xenical cheap albuterol cheap tenuate cheap ortho free music ringtones sagem ringtones cheap lisinopril meridia online cheap propecia cheap vigrx cheap diethylpropion cheap albuterol mp3 ringtones meridia online free ringtones cheap ultram soma online cheap lortab cheap sildenafil free nextel ringtones cheap lorazepam free funny ringtones diethylpropion online free ringtones funny ringtones cingular ringtones cheap soma nokia ringtones clonazepam online zyban online clomid online buy prozac online valium order lisinopril meridia online buy tramadol sharp ringtones free midi ringtones flexeril online real ringtones celexa online zoloft online free nextel ringtones ericsson ringtones free music ringtones mtv ringtones order ultram buy valium viagra online lorazepam online cheap cialis cheap phentermine buy nexium samsung ringtones cheap norco meridia online sprint ringtones buy rivotril order carisoprodol carisoprodol online cyclobenzaprine online free qwest ringtones free qwest ringtones cheap fioricet verizon ringtones punk ringtones cheap hoodia pharmacy online online tracfone ringtones tramadol cheap rivotril tramadol online didrex online cheap fioricet music ringtones cheap albuterol free nokia ringtones buy viagra buy alprazolam buy xenical pharmacy online online free funny ringtones order zanaflex free ericsson ringtones cyclobenzaprine online adipex online cheap xanax free alltel ringtones free qwest ringtones ultram online sonyericsson ringtones free samsung ringtones cheap lortab free mono ringtones free samsung ringtones zyban online cheap celexa free funny ringtones wwe ringtones cheap rivotril but clomid buy fioricet buy hgh cheap lipitor cheap hoodia clonazepam online cool ringtones tenuate online cheap vicodin real ringtones free sonyericsson ringtones buy hoodia buy tramadol nextel ringtones cheap alprazolam ambien online Yeast is a living single-cell fungi used in the production of beer. Yeast is added to sweet wort after cooling to initiate the fermentation process. During fermentation, yeast cells convert simple sugars such as glucose into carbon dioxide and alcohol. Fermentation can take anywhere from a few days to several weeks to complete. The type of yeast and particular strain of yeast used can have a large impact on the flavor and aroma of your beer. When possible, it is best to choose a yeast strain that is appropriate for the style of beer you are brewing.
Yeast Types
Yeasts come in three basic types - top fermenting ale yeast and bottom fermenting lager yeasts. Of the two, ale yeast are most commonly used for homebrewing because it can be fermented at room temperature.
- Top Fermenting Yeast - Commonly called ale yeast formally known as Saccharomyces cerevisae are fermented at or just below room temperature (10-25 C). These yeasts rise during fermentation and form a foamy head at the top of the fermentation vessel. They also produce a strong estery flavor that is a key characteristic of ales. Stouts, Porters and all forms of Ale are made with top fermenting yeast.
- Bottom Fermenting Yeast - Called lager yeast formally known as Saccharomyces uvarum is fermented at low temperatures in the range of 7-15 C. Lager yeast grows slowly and tends to settle at the bottom of the fermenter because of the cold temperature. Bocks, Pilsners, Marzens and popular American lagers are made with this type of yeast.
- Bavarian Wheat Yeast - Used in Bavarian style wheat beers - known formally as Torulaspora delbruechii is a yeast that produces a distinct bannana or clove like flavor profile that is characteristic of the Bavarian Wheat Beer.
Yeast Packaging
Yeast can be purchased in two basic types:
- Liquid Yeast - Liquid yeast is cultured yeast stored suspended in a liquid form. Liquid yeast is generally of higher purity and quality than comparable dry yeasts, and is a significant favorite with discriminating homebrewers. Packaging on liquid yeast varies. The two most popular forms are a plastic tube, and the smack-pack. The smack-pack form has a built in starter with a small packet of yeast in the middle. By pressing firmly on the package you can release the yeast into the starter hours in advance of brewing to give your yeast a head start. Liquid yeast should be stored in your refrigerator (not the freezer!) as it only has a shelf life of a few months.
- Dry Yeast - Dry yeast is sold in packets just like bread yeast in the grocery store. The yeast is made by dehydrating yeast cells. Dry yeast must be rehydrated by adding water before it is used. Dry yeast has a long shelf life of 1-2 years.
Yeasts
- BeerSmith Yeast Table
- [Add your yeast article here]
See Also
External Links
- BeerSmith Yeast Table - Most of the major homebrew yeasts
- White Labs Yeast
- Wyeast Labs Yeast
- Yeast Pitching Rates
