QUOTE (Martin Lake @ Jun 6 2006, 01:06 PM)
What makes lactose unfermentable?
First, let me clarify, when I say "fermentable", I mean fermentable by certain yeast strains of the Saccharomyces cerevisiae type. Many other types of yeast-based and bacterial fermentation are possible.
What keeps lactose from being fermentable is its molecular structure. It is undigestable by the yeasts that break down sugars into alcohol. Not all sugars can be broken down by those particular yeast strains. There are other yeast strains and numerous bacteria strains that can break them down; but the end products are either methanol or other toxic alcohols; or various other toxic or otherwise unwanted substances. Lactose can be broken down by certain bacteria, the most commonly known being lactobacillus, which breaks lactose down into lactic acid (eg. in yoghurt).
There are around 30 different sugar molecules; and only a small handful are fermentable into ethanol.
QUOTE (Grim @ Jun 6 2006, 01:41 PM)
Point being, I don't thing it's merely an issue of what substances are used in producing ethanol... there are other factors to consider.
True, but that is getting into a fairly complex process; and not something that is terribly common, historically. Simple distillation was the usual method; with freeze distillation not unheard of in more "rustic" settings (such as good old back-woods applejack).
QUOTE
I'm suprised someone like you isn't already making his own absinthe.

Time and money and space. And as much as I like absinthe, my first love is beer. Got a couple of homebrew projects I'm gearing up to start (belgian-style ale and rhubarb stout).
QUOTE (Mindshifter @ Jun 6 2006, 03:21 PM)
He he... Well, regarding its origins it is said that this method of preservation had an upswing in the beginning of the 16th century, when the salt supply (used for brining food) was scarce. One used just enough salt to keep the fish from rotting. Actually, it's more of a Norrlandish thing here so I'm sorry to say that I've never tried this "delicacy"... Or, um, perhaps not soo sorry after all! Have you had it? It certainly separates the men from the boys.
The only think I can think of that is more truly foul is haakarl.