Kagan, Soai win Nobel Prize in chemistry

STOCKHOLM — Scientists Henri Kagan and Kenso Soai won the 2026 Nobel Prize in chemistry for solving a long-standing riddle of how to form a single molecular mirror image, a discovery hugely important for pharmaceutical manufacturing, the award-giving body said on Wednesday.

"This is the most exciting day in my life, I am very glad to share this prize with professor Henri Kagan," Soai said, speaking by phone to the Nobel Prize news conference, adding that he had been out shopping when he received the news.

Soai is Japanese, and Kagan is French.

The chemistry Nobel, always the third prize to be awarded during Nobel week, followed those for medicine and physics announced on Monday and Tuesday.

"So this year's prize is about foundational chemistry," said Heiner Linke, chair of the Nobel Committee for Chemistry.

Many of the molecules essential to life exist in two forms that are mirror images of each other, like left and right hands, he said. Yet living organisms almost exclusively use only one version, a phenomenon known as "homochirality" — from the Greek word for hand — that has puzzled chemists for more than a century.

This year's prize was awarded for discoveries showing how chemical reactions can be driven to favor a single molecular mirror image, work that has been key for chemists who design reactions to manufacture pharmaceuticals.

"Many of the drug molecules occur in two variants that are each other's nonidentical mirror image: one has the therapeutic effect, while the other can cause unnecessary and sometimes harmful side effects," the Nobel Foundation said.

Established in the will of Swedish inventor and businessman Alfred Nobel, the prizes for achievements in science, literature and peace have been awarded since 1901, with a few interruptions mostly because of the world wars.

Nobel, a chemist by trade, amassed huge wealth in the 19th century from inventions primarily tied to warfare, most notably dynamite. The economics prize is a later addition funded by the Swedish central bank.

The laureates will receive their medals from Sweden's King Carl XVI Gustaf at a ceremony in Stockholm on Dec 10, the anniversary of Nobel's death.

AGENCIES VIA XINHUA