Ernst Chain

Sir Ernst Boris Chain was a German-born British biochemist. Biochemistry is the study of the chemical processes inside living things. Chain is most famous for his work on penicillin. This discovery changed how doctors treat infectious diseases. He shared the 1945 Nobel Prize in Physiology or Medicine for this work. He received the prize alongside Alexander Fleming and Howard Florey. Their research turned a natural substance into a life-saving medicine.

Chain was born in Berlin, Germany, on June 19, 1906. His father, Michael Chain, was a chemist and an industrialist. His mother was named Margarete. In 1930, Chain earned his chemistry degree from Friedrich Wilhelm University. However, his life changed when the Nazis came to power in Germany. Because he was Jewish, Chain knew he would not be safe. He moved to England on April 2, 1933. He arrived with only £10 in his pocket.

After moving to England, Chain pursued advanced scientific studies. He worked as a PhD student at Fitzwilliam College, Cambridge. There, he studied phospholipids under Sir Frederick Gowland Hopkins. In 1935, he became a lecturer in pathology at Oxford University. Chain researched many different topics during his time at Oxford. He studied snake venoms and how tumors use metabolism. He also looked at lysozymes and various biochemistry techniques. In April 1939, he became a naturalized British subject.

In 1939, Chain began a major project with Howard Florey. They wanted to investigate natural antibacterial agents. These are substances made by microorganisms that kill bacteria. They revisited the work of Alexander Fleming from nine years earlier. Fleming had described penicillin, but it was not yet a practical medicine. Chain and Florey worked to find penicillin's therapeutic action. This means they studied how the medicine actually cures disease. They also discovered its chemical composition.

A major part of their success was a specific process. Chain and Florey discovered how to isolate penicillin. To isolate something means to separate it from a mixture. They also learned how to concentrate the germ-killing agent. This made the penicillin strong enough to be used as a treatment. In 1942, Chain and Edward Abraham theorized the beta-lactam structure. This is the specific chemical shape of the penicillin molecule. In 1945, Dorothy Hodgkin used X-ray crystallography to confirm this structure. X-ray crystallography is a way to see the shape of molecules using X-rays.

Chain's life included both great success and personal hardship. During World War II, he learned his mother and sister were killed by the Nazis. After the war, he worked in Rome at the Istituto Superiore di Sanità. He returned to Britain in 1964 to work at Imperial College London. There, he founded and led the biochemistry department. He became a specialist in fermentation technologies. He was appointed a Fellow of the Royal Society in 1948. In 1969, he was named a Knight Bachelor.

Even a Nobel Prize winner faced challenges. In 1951, Chain was denied a visa to the United States twice. This happened because of the McCarran Internal Security Act of 1950. Later in life, Chain focused deeply on his Jewish identity. He was an ardent Zionist and served on the board of the Weizmann Institute of Science. He gave a famous speech titled "Why I am a Jew" in 1965. He also married Anne Beloff, who was a significant biochemist herself.

Ernst Chain died on August 12, 1979, in Castlebar, Ireland. His scientific legacy continues through the many lives saved by penicillin. His influence is still visible in the world of science today. The biochemistry building at Imperial College London is named after him. There is also a road named after him in Castlebar. His work helped bridge the gap between chemistry and medicine. He showed how understanding molecules can solve huge biological problems.