Chemistry Nobel to Kagan, 95, and Soai for the 'mirror molecule' mystery
The Royal Swedish Academy of Sciences awarded the 2026 Nobel Prize in Chemistry to Henri B. Kagan of Université Paris-Sud, France, and Kenso Soai of Tokyo University of Science, Japan, 'for the discovery of non-linear effects and autocatalysis in asymmetric organic synthesis.' They share 12 million Swedish kronor, about $1.2 million. Many molecules exist as mirror-image pairs, a property called chirality, yet living things use only one hand: left-handed amino acids, right-handed sugars. Kagan showed in 1986 that a catalyst's purity and the product's purity need not move in step, so an imperfect catalyst can yield a nearly perfect product. Soai designed a reaction, now named for him, in which the product catalyzes its own formation and a tiny initial imbalance grows toward 100% of one hand. Committee chair Heiner Linke called it a solution to a century-old puzzle: how one-handedness can emerge on its own. Kagan, born in 1930, is among the oldest laureates; he has not published since 2014.
This is the chemistry behind two questions. One is cosmic: why life on Earth is one-handed, and whether a small chance tilt early on could have been amplified into the biology we have. The other is industrial: many drugs have a useful hand and a harmful one, and making only the right one, asymmetric synthesis, is a multibillion-dollar craft. Kagan's and Soai's findings explain why that craft works as well as it does.
Nothing changes at the pharmacy tomorrow. But the pattern of this year's science prizes is worth noticing: the medicine, physics and chemistry awards all honored discoveries made decades ago. The Nobel is a lagging indicator.
The sentence to keep is 'a small imbalance amplifies itself.' It is a chemistry result, but it is also the most plausible answer anyone has to why your proteins are all left-handed. The Literature prize comes at 7 a.m. Eastern Thursday.
DailyDrop U.S. No. 3 · October 7, 2026