New Delhi. The 2026 Nobel Prize in Chemistry has been awarded for a scientific discovery that has shown a new way to understand a very complex question. The question is, how can some molecules that look almost similar be so different from each other and how can the initially small difference become so big with time. The work of Henry B. Kagan and Kenso Soi has played an important role in understanding this puzzle. His research concerns non-linear effects and autocatalysis in asymmetric organic synthesis.
The easiest example to understand this discovery is that of our left and right hands. Both hands are almost similar in appearance but when one is placed on top of the other, they do not match completely. Even in chemistry, some molecules behave in a similar manner. These are called chiral molecules and their two mirror image forms are called enantiomers. The structure of both forms is like a mirror image of each other, but their behavior may be different.
The importance of this difference is very high in the manufacturing of medicines. The body can recognize these two forms in different ways. One mirror image of a drug may produce the desired effect for the body while another version may be less effective or even harmful in some circumstances. For this reason, scientists want to develop such technology by which the correct form of the required molecule can be prepared in large quantities. The Thalidomide case has brought to light the seriousness of this issue.
This mystery is not limited to medicines only but is also related to the chemistry of life. Many molecules in the living world have two possible mirror image forms, but life often uses only one of these forms. This is called homochirality. For example, the amino acids that make up proteins may have two possible forms, but the living body uses only one of these forms to make proteins. Scientists have been trying to understand why this happened for a long time.
The work of Louis Pasteur was also important in this story. While studying tartaric acid, he observed crystals that existed in two different forms and were mirror images of each other. They later discovered that bacteria used one form of tartaric acid, but not its mirror image. This indicated that living things can differentiate between these two forms of molecules.
After this, Willy Markwald worked towards a chemical process in which more of one form could be formed instead of both mirror images being formed in equal amounts. In 1953, Charles Frank provided a model to explain how if a mirror image of a reaction gets a small lead initially and the same process continues to increase that lead, the small difference can become progressively larger. This can be understood from the idea of autocatalysis.
This is where the work of Henry Kagan and Kenso Soi becomes special. Kagan showed that very small changes in the catalyst could cause a huge difference between the amounts of the two mirror images in the final product. This was called non-linear effect. After this, Soai worked on a process in which the substance formed from the reaction itself helps in carrying forward the same reaction.
How big its impact can be can be understood from the experiments of 1995 and 2003. One process initially yielded only a 2 percent gain, but later the same figure reached 87 percent. Later a process was shown in which a very small initial gain was continuously increased and a mirror image could become dominant up to 99.99 percent. That is, a small initial difference can produce an exceptionally large result during a chemical process.
This discovery does not directly prove the mystery of the beginning of life, but it does provide a new way to understand how if both mirror images are present in the beginning, then one of them can gradually become dominant. Apart from this, such chemistry can also be useful in manufacturing medicines, flavors and fragrances and some chemicals used in farming.