Chemicals · Vol. IV|Penicillin production|1940s (industrial fermentation)

Penicillin production

1940s (industrial fermentation)

Fleming saw a mold kill bacteria in a dish in 1928. That was not yet a medicine. Oxford scientists purified enough to treat a person; wartime American labs learned to ferment penicillin in deep tanks on corn steep liquor. The landmark is not the lucky plate. It is the factory that made a drug a public good.

Fleming (1928 observation); Florey, Chain; U.S. labs for scale-up · Britain and the United States

Penicillin production — Original plate drawn for this atlas. Not a photograph of a museum object or a copyrighted portrait.

How the mechanism is arranged

A mold secretes a molecule that breaks bacterial cell walls. The dish shows a clear ring of inhibition.

How it works

Grow Penicillium in aerated tanks with a carefully chosen feed.
Extract and purify the antibiotic from the broth.
Dose so that bacteria die faster than they evolve resistance — a race still on.

Why it mattered

Turned many once-fatal infections into treatable ones.
Created the template of industrial biotechnology.
Taught a warning: overuse selects for resistance.

Who turned the wheel

b. 1930Tu Youyou

What it unlocked

1991 (Sony commercial cell)Lithium-ion battery

For further study

Science Museum, penicillin. Production artifacts.
Bud, Penicillin: Triumph and Tragedy. History and resistance.

Check

Why was Fleming’s dish not yet a technology of public health?