Hoppyland
Senior Member
Well, they might be a little obscure, perhaps, but quite a few homebrew suppliers sell them. I buy mine direct.What the hell is a brew lab yeast slope!? ðŸÂ»
Basically, a yeast slope is a pure laboratory culture of a specific yeast strain. It's called a "slope" because they are usually provided in a small sterile bottle (identical to the ones you'll have seen for urine samples. Into this has been poured, under sterile conditions, a quantity of agar that contains the correct nutrients to maintain the yeast. This "agar" is quite similar to gelatine - and it is poured into the wee bottle as a hot liquid. The bottle is held, and cooled, at an angle. Like gelatine, the agar "sets" as it cools - and so the resultant jelly-like solid appears to "slope" from one side of the bottle to the other.
Why do they make it slope? Because it makes the next bit easier. The initial "slope" is a sterile medium that will support yeast vitality. The next step is to take a pure culture of a particular brewery yeast and transfer it - again under sterile laboratory conditions - to the slope. (Usually, a red hot - then cooled - loop of wire is used for the transfer. The "slope" of the receiving medium makes this as quick as possible)
So, that's a yeast slope. The "Brewlab" bit refers to Sunderland University. They were the first I came across to offer pure commercial yeast strains to the general public. I guess it's now a for-profit offshoot of the Uni. I think they now mainly support small-scale commercial operations (their website isn't really geared to homebrewers - but I still buy through it!):
http://www.brewlab.co.uk/services/home-brew-yeast
By the way, I DO NOT have any financial affiliation to this company (I say that, cos I seem to keep mentioning them :))
The rumour that more info is available from:
[email protected] is a malicious lie :twisted:
Hope this helps!
Bill
Edit - blimey, a bit surprised the site would reckon my "Sycophant" mail address was a real one! Must try ot out tomorrow to see if it really is :lol: