The Royal Swedish Academy of Sciences announced the 2026 Nobel Prize in Chemistry winners in Stockholm, Sweden, on Wednesday. Henri B Kagan of Paris-Sud University in France and Kensō Soai of Tokyo University of Science in Japan were honored for their work on nonlinear effects and autocatalysis in asymmetric organic synthesis. The laureates will share equally in a prize of 12 million Swedish kronor, equivalent to approximately £900,000.
Molecules including amino acids and DNA sugars exist in two mirror-image forms, a property called chirality. Life’s chemistry exhibits a distinctive characteristic known as homochirality, where proteins are built almost exclusively from L-amino acids while DNA and RNA sugars have the opposite D-configuration. This phenomenon presented a longstanding scientific puzzle, as laboratory chemical reactions typically produce equal quantities of both mirror-image forms. The distinction carries significant practical implications, particularly in pharmaceutical development, since the two forms of chiral molecules can interact with biological systems in different ways, potentially leading to varying therapeutic effects or adverse outcomes.
Kagan’s research beginning in 1986 demonstrated that a small imbalance between left-handed and right-handed catalyst forms could create a greater excess of one mirror-image product. Soai subsequently advanced this work by developing a reaction in which the produced molecules themselves functioned as catalysts for manufacturing additional copies, a process termed autocatalysis. In 2003, Soai successfully demonstrated a reaction that produced almost exclusively one mirror-image form, replicating the molecular one-handedness observed in living organisms and potentially explaining how such uniformity could have originated naturally.
According to Nobel committee member Peter Somfai of Lund University, the combined discoveries have fundamentally transformed understanding of how molecular chirality is created, amplified, and transmitted. The insights have been integrated into catalyst development across multiple industries, influencing how chemical reactions are directed toward producing specific mirror-image forms. These methodologies have become foundational tools in pharmaceutical and chemical manufacturing sectors for developing drugs and other products requiring precise molecular configuration.
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