The 2026 Nobel Prize in Chemistry has been awarded to French scientist Henri Kagan and Japanese researcher Kenso Soai for their groundbreaking work on understanding why only one form of certain molecules, known as chiral molecules, predominantly appears in nature. Their discovery has significant implications for pharmaceutical manufacturing.

The Royal Swedish Academy of Sciences recognized the pair "for the discovery of non-linear effects and autocatalysis in asymmetric organic synthesis." This work addresses the phenomenon of homochirality, whereby molecules such as amino acids exist as two mirror-image variants, yet only one is commonly found in biological systems. The origin of this molecular preference had remained a chemical mystery for over a century.

Kagan, who is 95 years old and professor emeritus at Université Paris-Saclay, developed a novel method to manipulate chemical reactions to favor the production of one chiral form over the other beyond previously expected limits. Meanwhile, Soai, 76, a professor at Tokyo University of Science, created the first chemical reaction that produces exclusively one mirror-image form, demonstrating how homochirality can arise spontaneously. Their combined research builds on foundational work from the 19th century by French chemist Louis Pasteur.

Heiner Linke, chair of the Nobel Committee for Chemistry, described their discoveries as "spectacular," highlighting the importance of their contributions to foundational chemistry. He noted that many molecules are chiral—like human hands, which are mirror images but cannot be perfectly superimposed—and these molecular properties are crucial in biological processes.

Soai expressed his excitement upon receiving the award during a press conference, stating it was "one of the most exciting days" of his life. He learned of the prize while out shopping. The committee had not reached Kagan before the public announcement. French President Emmanuel Macron congratulated Kagan on X, calling the achievement a source of national pride.

The Nobel Prize, established in 1901 from the will of Swedish inventor Alfred Nobel, recognizes outstanding contributions in various fields. The chemistry award follows those announced for medicine and physics in early October. The laureates will receive their medals from Sweden’s King Carl XVI Gustaf at a ceremony in Stockholm on December 10, the anniversary of Nobel’s death. They will also share a monetary award totaling 12 million Swedish kronor (approximately US$1.5 million).

This year’s prize underscores the continued importance of chemistry in advancing scientific understanding and its applications, particularly in medicine, where the control of molecular chirality is essential for drug efficacy and safety.