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The Royal Swedish Academy of Sciences announced on Wednesday that the 2026 Nobel Prize in Chemistry has been jointly awarded to France's Henri Kagan and Japan's Kenso Soai, honoring their pioneering work on non-linear effects and autocatalysis in asymmetric organic synthesis.
The award recognizes two researchers whose discoveries helped explain one of chemistry's most enduring puzzles: how homochirality — the preference for a single mirror-image form of a molecule — can arise spontaneously in nature.
Heiner Linke, chair of the Nobel Committee for Chemistry, described the significance of their achievements in unusually vivid terms. "Henri Kagan and Kenso Soai have provided a solution to a chemical mystery that is over a century old: how homochirality can emerge spontaneously," Linke said in a news release. "The chemical reactions they have developed are spectacular."
Kagan is affiliated with Université Paris-Sud in Orsay, France, while Soai, who is 95 years old, is associated with the Tokyo University of Science. Their combined body of work spans decades of experimental chemistry and has left a lasting mark on how scientists understand molecular self-organization.
At its heart, the research addresses a fundamental question about life itself. Many of the molecules that make up living organisms come in two forms that are mirror images of each other, much like a left hand and a right hand. Yet biology overwhelmingly uses only one of these forms. Amino acids, for example, are almost exclusively left-handed, while the sugars in DNA are right-handed. This phenomenon, known as homochirality, is essential to how proteins fold and how genetic information is stored and copied.
The long-standing mystery has been how such uniformity could ever have emerged from a primordial soup where both forms should have been equally likely. The work of Kagan and Soai offered a compelling chemical explanation, showing how asymmetric reactions can amplify small imbalances and drive a system toward a single handedness.
Kagan's contributions centered on the discovery of non-linear effects in asymmetric catalysis. His research demonstrated that the relationship between the purity of a chiral catalyst and the purity of the product it produces is not always straightforward. In certain reactions, a modest enrichment of one mirror form in the catalyst can yield a dramatically amplified excess in the product. This non-linear behavior provided a mechanism by which a tiny initial bias could be magnified into a pronounced preference.
Soai, meanwhile, became known for discovering the first example of asymmetric autocatalysis, a reaction in which the product of the reaction itself acts as a catalyst to accelerate its own formation while favoring one mirror form over the other. This self-replicating chemical system showed that a molecule could effectively promote its own production and, in doing so, amplify its own chirality. Such a process offers a plausible route by which homochirality could have taken hold on the early Earth without any external chiral influence.
Taken together, the two scientists' discoveries illustrate how chemical systems can spontaneously break symmetry and settle into a single handedness. The implications extend well beyond theoretical curiosity. Asymmetric synthesis is central to the pharmaceutical industry, where the two mirror forms of a drug can have vastly different effects — one may be therapeutic while the other is ineffective or even harmful. A deeper understanding of non-linear effects and autocatalysis can inform the design of more efficient and selective methods for producing pure chiral compounds.
The prize announcement was made in Stockholm, continuing this year's Nobel season. The chemistry award follows Monday's Nobel Prize in Medicine, which went to Karl Deisseroth, Peter Hegemann and Georg Nagel for their work on a light-based tool that helps researchers unravel how the brain works. On Tuesday, the physics prize recognized a scientist's efforts to demystify a rare group of neutrinos.
Last year's chemistry prize honored three scientists who developed new molecular structures capable of trapping vast quantities of gas inside them, laying the groundwork for technologies that could potentially pull greenhouse gases out of the atmosphere or harvest moisture from desert air. This year's award shifts the focus from practical environmental applications to foundational questions about the origins of molecular asymmetry.
The Nobel Prize in Literature is scheduled to be announced on Thursday, followed by the Peace Prize on Friday. The Nobel Memorial Prize in Economic Sciences will be revealed on Monday.
Each Nobel Prize carries a monetary award of 12 million Swedish kronor, equivalent to roughly $1.2 million, regardless of whether it is given to an individual, shared among a small group of laureates, or awarded to an organization.
Kagan and Soai's recognition underscores the enduring importance of fundamental chemistry. Their work did not merely solve an academic puzzle; it illuminated a pathway by which the molecular building blocks of life may have acquired the uniform handedness that makes biological complexity possible. In doing so, they transformed a century-old mystery into a story of chemical self-organization that continues to inspire researchers across disciplines.
*(FRANCE 24 with AP and Reuters)*
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