[S. cerevisiae]

{P}henolic {O}ff {F}lavor… very few POF+ yeasts are used in brewing but a number of wine yeasts are POF+.

Actually, quite a few brewing strains are POF+.  In fact, as I mentioned above, many British strains POF+ to some extent.  True POF- strains do not throw phenolic flavors when fermented really warm.  Lager strains are generally never POF+.  They just throw other types of trash when fermented warm.

[pete b]

Are cold tolerant strains less preferable?

No, but cold tolerant strains tend to be Saccharomyces bayanus (S. bayanus), not Saccharomyces cerevisiae (S. cerevisiae).  Champagne yeast strains belong to the S. bayanus species (EC 1118 is good down to 45F).  Lager yeast (Saccharomyces pastorianus) is now believed to be the result of a hybridization event between S. cerevisiae and a Patagonian yeast species known as Saccharomyces ebayanus.

What is POF

• ?

Phenolic Off-Flavor Positive

Hefeweizen strains are POF+. Belgian strains tend to be POF+.  There are many English strains that are POF+.   I am sensitive to phenols; therefore, I am not a fan of POF+ strains.

Got it. I like most of those strains in the right context but am all to familiar with them appearing in the wrong place in too warm fermentations. I'm sorry but not surprised that ebay now has their own yeast strain.

[erockrph]

  Lager yeast (Saccharomyces pastorianus) is now believed to be the result of a hybridization event between S. cerevisiae and a Patagonian yeast species known as Saccharomyces ebayanus.

Got it. I like most of those strains in the right context but am all to familiar with them appearing in the wrong place in too warm fermentations. I'm sorry but not surprised that ebay now has their own yeast strain.

It's actually a typo. The species is S. eubayanus. And recent research suggests that it may be of Tibetan origin, rather than Patagonian:

http://www.sciencedirect.com/science/article/pii/S0960982214004692

[pete b]

  Lager yeast (Saccharomyces pastorianus) is now believed to be the result of a hybridization event between S. cerevisiae and a Patagonian yeast species known as Saccharomyces ebayanus.

Got it. I like most of those strains in the right context but am all to familiar with them appearing in the wrong place in too warm fermentations. I'm sorry but not surprised that ebay now has their own yeast strain.

It's actually a typo. The species is S. eubayanus. And recent research suggests that it may be of Tibetan origin, rather than Patagonian:

http://www.sciencedirect.com/science/article/pii/S0960982214004692

Tibetan yeast. Cool. Someone should name a beer made with it "the Dali Lager". (where I live in Massachusetts "lager" and "Lama" almost rhyme: "Dali Laahga")

[anthony]

{P}henolic {O}ff {F}lavor… very few POF+ yeasts are used in brewing but a number of wine yeasts are POF+.

Actually, quite a few brewing strains are POF+.  In fact, as I mentioned above, many British strains POF+ to some extent.  True POF- strains do not throw phenolic flavors when fermented really warm.  Lager strains are generally never POF+.  They just throw other types of trash when fermented warm.

There are a number of yeast strains, isolated from breweries, that are POF+. I stand by my original comment that in modern breweries, the vast majority of yeasts in use are, in fact, not POF+.

[erockrph]

{P}henolic {O}ff {F}lavor… very few POF+ yeasts are used in brewing but a number of wine yeasts are POF+.

Actually, quite a few brewing strains are POF+.  In fact, as I mentioned above, many British strains POF+ to some extent.  True POF- strains do not throw phenolic flavors when fermented really warm.  Lager strains are generally never POF+.  They just throw other types of trash when fermented warm.

There are a number of yeast strains, isolated from breweries, that are POF+. I stand by my original comment that in modern breweries, the vast majority of yeasts in use are, in fact, not POF+.

That's because the vast majority either use Chico or a lager strain...

[klickitat jim]

This thread shows how gullible I can be.  I actually thought ebay had yeast now

[brewinhard]

This thread shows how gullible I can be.  I actually thought ebay had yeast now

I could totally see you searching for it as well.  Heh, heh.....

[klickitat jim]

This thread shows how gullible I can be.  I actually thought ebay had yeast now

I could totally see you searching for it as well.  Heh, heh.....

Crossed my mind briefly, but I trust what is posted here.

[S. cerevisiae]

While there are ale strains that are completely POF-, a large proper subset of the ale strains that are currently in production use worldwide are POF+ to some extent.   The ale strains that are available to American amateur and professional craft brewers are a very tiny fraction of the ale strains that are in use worldwide.  Alan Pugsley has mentioned many times that Ringwood is considered to be a neutral yeast culture in the UK.   My experience with  strains imported directly from the UK correlates with his claim.

Let's examine the strains that are available from Brewlab in the UK.

Brewlab 1500 Thames Valley 1 (allegedly the Courage strain) is POF-  (http://www.brewlab.co.uk/pdf/yeast_1.pdf)

Brewlab 1508 Thames Valley 2 is POF- (www.brewlab.co.uk/pdf/yeast_2.pdf)

Brewlab 1000 Thames Valley 3 (Fuller's) is POF- (www.brewlab.co.uk/pdf/yeast_3.pdf)

Brewlab Sussex 1 (Harvey's) is POF+  (www.brewlab.co.uk/pdf/yeast_4.pdf)

Brewlab East Midlands 1 (Bateman's) is POF- (http://www.brewlab.co.uk/pdf/yeast_5.pdf)

Brewlab Burton 1 (Marston's) is POF+ (http://www.brewlab.co.uk/pdf/yeast_6.pdf)

Brewlab Devon is POF+ (http://www.brewlab.co.uk/pdf/yeast_7.pdf)

Brewlab Kent (Shepard Neame) is POF+ (http://www.brewlab.co.uk/pdf/yeast_8.pdf)

Brewlab Yorkshire (Black Sheep) is POF+ (http://www.brewlab.co.uk/pdf/yeast_9.pdf)

Brewlab Lancashire (Thwaites) is POF+ (http://www.brewlab.co.uk/pdf/yeast_10.pdf)

Brewlab Tyneside is POF+ (http://www.brewlab.co.uk/pdf/yeast_11.pdf)

Brewlab Scottish Borders (McKewen's) is POF- (http://www.brewlab.co.uk/pdf/yeast_12.pdf)

Hence, seven out of the twelve most popular yeast strains in Brewlab's bank are POF+ to some extent, and we have not even touched the more funky strains in their bank.