Henri Kagan and Kenso Soai win 2026 Nobel Prize in Chemistry

Henri Kagan and Kenso Soai win 2026 Nobel Prize in Chemistry

The 2026 Nobel Prize in Chemistry has been awarded to French scientist Henri B. Kagan and Japanese researcher Kenso Soai for the discovery of non-linear effects and autocatalysis in asymmetric organic synthesis.

The Royal Swedish Academy of Sciences announced the prize in Stockholm on Wednesday, October 7, 2026, answering a chemical mystery that is over a century old. For more than a century, organic chemistry lab work produced an equal fifty-fifty mix of mirror-image molecules, leaving scientists baffled as to why living beings use only a single version in their proteins. Kagan and Soai solved how homochirality can emerge spontaneously.

Heiner Linke, chair of the Nobel Committee for Chemistry, stated in a news release, Henri Kagan and Kenso Soai have provided a solution to a chemical mystery that is over a century old: how homochirality can emerge spontaneously. The chemical reactions they have developed are spectacular. Linke added, So this year's prize is about foundational chemistry. Many molecules occur in two different versions. Like my hands. They are one another's mirror image, they look alike, but they are not identical. I cannot put my hands on top of one another. Such molecules are called chiral, from the Greek word for hand.

Peter Somfai, a member of the Nobel Committee for Chemistry, called the research, Probably the coolest experiment in organic chemistry, noting that Taken together, the groundbreaking discoveries by Henri Kagan and Kenso Soai have reshaped our understanding of molecular chirality — how it is created, amplified and transmitted.

How mirror images shape life and industry

To grasp the breakthrough, it helps to look at human hands, which are mirror images of each other yet cannot be perfectly aligned on top of one another. In nature, biological building blocks like amino acids exist in left-handed and right-handed forms, but living cells exclusively use one mirror version. Standard laboratory experiments always created an equal mix of both until the laureates altered the equation. Kagan made the first major breakthrough in the 1980s while working at Université Paris-Sud in Orsay, France, discovering non-linear effects that allowed chemists to manipulate chemical reactions and yield a much higher proportion of one mirror image than previously thought possible.

Years later, Kenso Soai took the concept further. Born in 1950 in Japan and affiliated with the Tokyo University of Science, Soai designed a unique chemical reaction in 1995 that possessed self-amplifying potential, producing only a single mirror image through autocatalysis. The Nobel committee stated, Other than life itself, no one had ever achieved this feat.

Many molecules of life come in versions that look alike but aren't exactly identical, like right and left hands. One mirror image of the chemical carvone smells like mint, for example, while the other has a whiff of caraway. When designing drugs to treat diseases, scientists want to be choosy about which mirror image they are getting. Rigoberto Hernandez, president of the American Chemical Society, stated, The medicines we have today would not be possible without this chemistry. Peter Somfai added, It might be difficult to say that this drug, or that drug, was developed using this. I would say all of them, because we use this as a tool, we use this as an understanding, how to develop catalysts, how they function.

Beyond life-saving medicines, these techniques help manufacturers create safer agricultural chemicals, flavours, scents, and novel materials. Furthermore, Soai's self-amplifying reaction has sparked fresh global research into how fundamental life components first originated on Earth.

Who are the laureates and how do the awards compare?

Henri B. Kagan was born in Boulogne-Billancourt, France, and is 95 years old. The French Academy of Sciences congratulated the two scientists and expressed its pride in the prize. Kenso Soai was born in 1950 in Japan. When reached by the Nobel committee, Soai told journalists by phone, I'm very excited to receive the very nice news. Of course this is one of the most exciting days in my life. He said he was shopping near his home when he received the call.

The 2026 laureates join a distinguished list of recent scientific discoveries recognized by Stockholm. The chemistry Nobel followed those for medicine and physics announced on Monday and Tuesday. The Nobel Prize in Physiology or Medicine was awarded jointly to Karl Deisseroth, Peter Hegemann and Georg Nagel for discoveries involving light-gated ion channels and their role in optogenetics. The Nobel Prize in Physics was awarded to Francis Halzen for his contributions to IceCube, a neutrino observatory at the South Pole, and the discovery of high-energy neutrinos of astrophysical origin.

Last year's chemistry award went to Susumu Kitagawa, Richard Robson and Omar M. Yaghi for the development of metal-organic frameworks (MOFs), which are molecular constructions that can help tackle challenges such as climate change and lack of fresh water.

The two laureates will equally share the total prize money of 12 million Swedish kronor, which equals roughly $1.2 million, along with a diploma and a gold medal. Established in the will of Alfred Nobel, the prizes have been awarded since 1901. The laureates will receive their medals from Sweden's King Carl XVI Gustaf at a ceremony in Stockholm on December 10, the anniversary of Alfred Nobel's death, followed by a banquet at Stockholm City Hall.

What comes next for the Nobel announcement week?

The science awards mark the middle of the annual Nobel announcement cycle in Stockholm. The literature laureate will be revealed on Thursday, October 8, 2026, followed by the Nobel Peace Prize on Friday, October 9, 2026. The Nobel Memorial Prize in Economic Sciences will be announced on Monday.