The 2026 Nobel Prize in Chemistry has been awarded to scientists Henri Kagan and Kenso Soai for their groundbreaking work on asymmetric "mirror image" molecules. This discovery is crucial for pharmaceutical manufacturing, as it allows for the creation of specific molecular forms that can have different effects on the body. Soai, 76, is Japanese, while Kagan, 95, is French. Their work built upon a discovery by 19th-century French chemist Louis Pasteur.
Kagan and Soai's research focused on solving the long-standing riddle of homochirality, a phenomenon where living organisms exclusively use one version of a molecule. This is significant, as many essential molecules exist in two forms that are mirror images of each other, similar to left and right hands. The laureates' work showed how chemical reactions can be driven to favor a single molecular mirror image, providing powerful tools for chemists designing reactions for pharmaceutical manufacture.
The importance of this discovery is highlighted by the thalidomide scandal in the early 1960s. Thousands of children were affected by birth defects caused by the sedative thalidomide, which was later found to be the active substance's mirror image that caused the harm. Kagan and Soai's work has paved the way for the development of methods to selectively prepare specific molecular forms, which is critical in the production of pharmaceuticals.
Henri Kagan's work has been influential in the field, and he is the third-oldest person to be awarded a Nobel Prize. His daughter, Veronique Le Deunff, expressed her happiness and noted that his creativity and originality have opened up new avenues for research. Kenso Soai, on the other hand, received the news while grocery shopping and described it as the most exciting day of his life.
The Nobel Committee for Chemistry member Peter Somfai explained that the laureates' findings provided essential tools for developing methods to selectively prepare specific molecular forms. He described their experiment as "probably the coolest experiment in organic chemistry." The prize was announced on October 8, 2026, and follows those for medicine and physics, which were announced earlier in the week.
The Nobel Prizes were established in the will of Swedish inventor and businessman Alfred Nobel and have been awarded since 1901, with a few interruptions due to world wars. The chemistry award is often overshadowed by more famous laureates in other fields, but it has recognized many influential discoveries, such as nuclear fission and genetic sequencing techniques.
Kagan and Soai will receive their medals from Sweden's King Carl XVI Gustaf at a ceremony in Stockholm on December 10, along with a share of 12 million Swedish crowns ($1.2 million). They will also be honored at a lavish banquet at Stockholm City Hall. French President Emmanuel Macron and Japanese Prime Minister Sanae Takaichi have congratulated the laureates on their achievement.
Key points
- The Nobel Prize in Chemistry was awarded to Henri Kagan and Kenso Soai for their work on asymmetric molecules.
- The discovery is crucial for pharmaceutical manufacturing, allowing for the creation of specific molecular forms.
- The laureates' work built upon a discovery by 19th-century French chemist Louis Pasteur.
