Hi folks. I've been wondering if any of the dry yeasts on the market are actually blends? Does anyone know?
I have found no evidence of any dry yeast blends being sold commercially. There are some liquid yeast blends (one or two White Labs Belgian Ale yeasts come to mind) but these are specific cases in which the different yeasties pretty much grew up together and play nicely, so to speak, without getting into a tug of war about who ferments what first. There are also still a number of traditional breweries here and there who have a "house yeast" that is actually a culture of multiple (sometimes 4 or more) strains. However, these are strains that work well together and either have adapted to each other or ended up in the blend because of their similar growth and fermentation kinetics.
Most yeast blends are problematic; the various yeasts in the blend begin to compete with each other, and small variations (wort composition, temperature, DO levels and what have you) may result in marked differences in yeast growth and therefore lead to unpredictable results.
Has any of the DNA testing thrown that up?
Not to my knowledge. All we have so far in home brewing land is comparison based on characteristics.
We often automatically assume that all yeasts sold commercially are single strain, it seems. Mangrove Jacks says their yeast shouldn't be re-pitched which is likely just a ploy to sell more yeast, but it perhaps indicates some blending going on?
That was my initial thought as well. Then I learned (from several people in the industry) that they're just repacking. So the "Thou shalt not repitch" admonition is probably smoke and mirrors. As are the small variations in specification on the packages.
For example, the M36 doesn't appear to be like any other dry yeast
Looking at the specs I think they're not all that different:
Yeast | M36 Liberty Bell Ale | Lallemand London English Style Ale (F.k.a. ESB) |
Temperature range | 18-23 | 18-22 |
Attenuation | 74-48% | Medium |
Flocculation /Sedimentatino | Med-High | Med-High |
POF | - | - |
Alcohol tolerance | 9 | 12 |
Flavour profile | Light fruity esters, clean, medium body | Medium esters, quick fermentation |
Origin | ? | Whitbread descendant? (Uncertain) |
The most glaring discrepancy here is the ABV tolerance; however a 12% limit yeast can easily be marketed at a 9% limit yeast to confuse the issue a little for marketing purposes.
and I doubt it is uniquely made for them as a single strain?
Mangrove Jacks / Brewcraft / iMake has no yeast production or development lab, nor do they employ one. They simply repack mainstream brands under their own name with descriptions that are slightly fudged but are still applicable.
The MJ extract kits were designed for them by James Kemp, a brewer who knows a thing or two about yeast from his spells at some of the best English breweries - Fuller's, Thornbridge, Marble, Buxton, Magic Rock and now Yeastie Boys - so maybe he gave them some advice on putting together some multi-strain dry yeasts for commercial sale that would offer something new and more interesting to the market?
A man with his background will know the dangers of yeast blends in a home brewing scenario where all fermentation factors (temperature and DO more than anything else) will vary wildly, so my guess is no, he knew better than that and stuck with the robust and almost Armagheddon-proof Mauri 514 strain. This has been the kit yeast of choice for just about everyone because it's one of the most robust yeasts that is as close to being foolproof as it gets. (AFAIK Mauri 415 is an EDME descendant that emigrated to Australia and adapted to the climate there, which has given it a wide temperature range across which performance is sufficiently similar for kit brewing.)
When I spoke to the head of marketing at MJ UK a couple of years ago all he would say is that one of their yeasts is Nottingham. M42 obviously. Oh and he said some of their yeasts are re-packages and some are produced just for them. But not where or how or why or anything. That could presumably mean cloning other producers' strains, or blending them, perhaps.
There is no dried yeast strain that is uniquely produced for MJ. All their yeasts come from either DCL/Fermentis or Lallemand/Danstar production labs and are packed in MJ packets in a facility in the UK. (The latter I have been told by a rep fairly high up in the tree at DCL/Fermentis.)
Am I right in thinking that only a very limited number of producers have the resources to develop and introduce new dry strains? Like Lallemand and Fermentis? And Mauribrew, from their baking yeast operation, I guess.
You absolutely are.
Germany seems to get mentioned, who makes dried yeast there?
Not sure. There is a yeast production lab in Scandinavia where the Italian multinational AEB has their yeasts produced (based on what I've been told by AEB reps) so maybe they do that for other brands as well.
Who makes Munton's yeasts?
Muntons Standard Yeast is just a classic EDME strain like Fermentis S-33, and these days it probably
is S-33. Its flavour profile is closer to S-33 than to the Mauri 514 used for Australian and NZ beer kits yeasts . Muntons Premium Yeast is Nottingham Ale yeast.
Brewferm presumably buys theirs in, possibly a Mauribrew connection?
Brewferm Y015 Blanche = Mauri 1433; Brewferm Y016 lager = Mauri 497; Brewferm Top Fermenting = Mauri 514 (i.e. kit yeast).
Please note: at this point we will now all pause while Vale71 ridicules all the above and claims that none of it has any validity whatsoever but must be considered utter nonsense until proven via extensive trials in a microbiology lab.
Cheers!