After testing 349 chemical combinations, Paul Hermann Müller identified the insecticidal properties of dichlorodiphenyltrichloroethane in September 1939. This discovery of the compound commonly known as DDT provided a potent solution for controlling vector-borne diseases such as malaria, typhus, and the plague, fundamentally changing the approach to public health and agricultural pest management during the twentieth century.
Early Education and Academic Foundation
Born in Olten in 1899, Müller pursued his early interest in science through independent experimentation with radio equipment and photography. Despite leaving school in 1916, he returned to academic life, eventually enrolling at the University of Basel in 1919. He studied chemistry with minors in botany and physics, earning a Doctor of Philosophy degree in 1925 under the supervision of Hans Rupe. His doctoral dissertation focused on the oxidation of asymmetrical m-Xylidene, and he completed his studies with summa cum laude honors.
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Müller began his career as a research chemist for the dye division of J. R. Geigy AG in 1925. His initial projects involved synthetic and plant-based tanning agents, leading to the creation of the Irgatan product line. In 1935, his focus shifted toward plant protection, driven by his background in botany. During this period, he patented rhodanide- and cyanate-based compounds and developed Graminone, a seed disinfectant that offered a safer alternative to the mercury-based products prevalent at the time.
The Development of DDT
Müller sought a contact insecticide that was effective, inexpensive, stable, and low in toxicity to mammals. His search was influenced by food shortages in Switzerland and the severity of typhus epidemics. Although the chemical structure had been synthesized by Othmar Zeidler in 1874, its insecticidal potential remained unrecognized until Müller's experiments in 1939. Following successful tests against the Colorado potato beetle, the compound proved remarkably effective against mosquitoes, lice, and sandflies. By 1943, DDT was incorporated into military supply lists and began widespread use in residual spraying programs.
Nobel Recognition and Later Career
In 1946, Müller was appointed Deputy Director of Scientific Research on Substances for Plant Protection at Geigy. He received the 1948 Nobel Prize in Physiology or Medicine, an unusual distinction for a chemist without a medical background. The committee recognized the immense public health impact of DDT in preserving lives in camps and prisons. Müller continued his scientific career until his death in 1965 in Basel, where he was buried at the Friedhof am Hörnli.
Fast facts
- Born: 1899, Olten, Switzerland
- Died: 1965, Basel, Switzerland
- Education: University of Basel, 1919-1925
- Academic Degree: Doctor of Philosophy
- Primary Field: Chemistry
- Award: Nobel Prize in Physiology or Medicine, 1948
- Burial Site: Friedhof am Hörnli
Questions readers ask
Did Müller invent DDT?
No. The compound was first synthesized in 1874 by Othmar Zeidler, but its insecticidal properties were discovered by Müller in 1939.
Why was a chemist awarded the Nobel Prize in Physiology or Medicine?
The Nobel Committee awarded him the prize in 1948 specifically for his discovery of the high efficiency of DDT as a contact poison against arthropods that spread human diseases.
Achievements
- Nobel Prize in Physiology or Medicine — 1948
- Educated at University of Basel
- Fields of research: malaria