Adolf Butenandt won the 1939 Nobel Prize in Chemistry "for his work on sex hormones."[1] Part of that work involved isolating androgens from human urine — an approach that required enormous starting volumes because the hormones are present in vanishingly small quantities.
This episode carries a caveat rather than a headline figure. The volume most often quoted — fifteen thousand litres — is repeated widely in popular accounts of the discovery. It does not appear in the peer-reviewed historical sources this hub cites, and rather than pass it along, it is flagged here as unverified. The underlying point survives without it: the concentrations were so low that industrial-scale collection was the only route.
Why urine, and why so much of it
Steroid hormones and their metabolites are excreted in urine. Before modern analytical chemistry, that made urine the practical starting material — not because it was rich in hormone, but because it was available in quantity and nothing else was.
The ratio is the whole problem. To characterise a molecule you need enough of it to run chemistry on, and the yield from any biological source was minute. This is the same scarcity that had defeated the previous fifty years of organotherapy: a crude testicular extract prepared by nineteenth-century methods contains testosterone at concentrations four orders of magnitude below a biologically active dose.[2]
Butenandt's contribution was not finding a richer source. It was extracting, purifying and characterising the molecule from a poor one.
What the sourced record does say
The definitive history is specific about the outcome, if not the logistics: in 1935, together with their teams, Ernst Laqueur in Amsterdam isolated testosterone, and Adolf Butenandt in Gdansk as well as Leopold Ruzicka in Zürich synthesised it.[3]
It is also specific about the motive. In reaction to the malpractice of the organotherapy era, science and the young pharmaceutical industry initiated the search for the male hormone.[3] This was a funded, deliberate hunt, not a serendipitous find — which explains the willingness to process absurd quantities of raw material.
And the Nobel committee's own summary of Butenandt's achievement is that he produced a male sex hormone in pure form for the first time and determined its chemical composition.[1]
Why purity was the achievement
"Pure form" is the operative phrase. Every failed treatment of the previous half-century had used impure biological preparations — extracts, grafts, transplants — whose active content was unknown and, as it turned out, negligible.[2]
A pure compound can be weighed. A weighable compound can be dosed. A dosable compound can be tested against placebo. The entire apparatus of modern testosterone medicine — a target range, a measured serum level, a randomised trial — rests on somebody first getting the substance clean.
Frequently asked questions
Was the first androgen isolated the same as testosterone? Butenandt's early androgen work and the 1935 isolation of testosterone itself are distinct steps. The Nobel citation credits him broadly for work on sex hormones, including producing a male sex hormone in pure form for the first time.[1]
Why not extract it from testes instead? Attempted for decades, with the results described in the Brown-Séquard story — the extracts were essentially inert.[2]
Is the 15,000-litre figure wrong? Not necessarily — it is unverified in the sources cited here, which is a different claim. If a primary source establishes it, this page will carry it with that citation.
Next in this series
The isolation was one half of 1935. The other half happened in two chemistry labs, and produced a prize one laureate was forbidden to accept.
Continue with why 1935 changed medicine forever.
References
3 sources
- The Nobel Foundation. The Nobel Prize in Chemistry 1939 — Adolf Butenandt "for his work on sex hormones" and Leopold Ruzicka "for his work on polymethylenes and higher terpenes". nobelprize.org
- Cussons AJ, Bhagat CI, Fletcher SJ, et al. Brown-Séquard revisited: a lesson from history on the placebo effect of androgen treatment. Med J Aust. 2002;177(11-12):678–679. doi:10.5694/j.1326-5377.2002.tb05014.x · PMID 12463999
- Nieschlag E, Nieschlag S. ENDOCRINE HISTORY: The history of discovery, synthesis and development of testosterone for clinical use. Eur J Endocrinol. 2019;180(6):R201–R212. doi:10.1530/EJE-19-0071 · PMID 30959485
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