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Comment by toshk | Hacker News Reader

I never understood the sterilizing theory, it coincides with the claims these times they also had mostly low alcohol types of beverages, such a beer and ale.

The sterilizing only really happens in modern wine level alcohol (14%).

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You have to boil the water to make the beer.

I didn;t know to be honest. So good point, thanks for clarification.

However I dove into it, Boiling wasn't always easy, so they didn't always heat it properly for sterilization: https://byo.com/article/raw-ale/.

You have to boil the wort for hours otherwise it's not beer, it's porridge. It's that process that kills any pathogens, not the fermentation (obviously, since fermentation requires the presence of pathogens).

So boiling isn't strictly required, though it has nice benefits on the wort (in a phase called the "hot break"). However, it is necessary to reach certain temperature (140-160 F, though broader may work) to convert starch into sugar.

In old times, a metal vessel large enough to boil an entire batch of wort may not have been feasible. Other techniques were used in these cases.

Say you have a wooden barrel or tub:

* Take off a portion of the wort, boil it, and add it back. This is decoction.

* Heat rocks and add them into the wort.

> In old times, a metal vessel large enough to boil an entire batch of wort may not have been feasible.

Define 'old times'?

Eventually the most alcohol tolerant bacteria, the ones primarily fermenting the sugars, get killed by the alcohol itself (by denaturation, the alcohol makes the membranes soluble in water). At that point there are very few more alcohol tolerant bacterium.

Bacteria does not make alcohol. It is yeast, which is a fungus.

Ah true. I'm using the wrong family name.

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