Britannica
Sources used in this answer
How did Howard Florey and Ernst Chain help develop penicillin?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
Antibiotic
Learn why antibiotics are important and how to prevent their overuse.
While Sir Alexander Fleming discovered penicillin in 1928, he was unable to stabilize or purify it for clinical use. A decade later, Howard Florey and Ernst Chain at the University of Oxford led the multidisciplinary team that transformed the substance into a life-saving medicine.1234
Their contributions included:
- Isolation and Purification: Florey and Chain successfully isolated penicillin in a sufficiently pure form to demonstrate its potency and relative lack of toxicity.2
- Demonstrating Efficacy: They proved the drug's curative properties through studies on mice infected with streptococcal infections and subsequently conducted clinical trials on human patients.34
- Production Development: Recognizing the need for mass production, they developed initial methods for growing the mold and collaborated with researchers in the United States to scale up manufacturing using large fermentation vats.324
For this groundbreaking work, Florey, Chain, and Fleming were jointly awarded the Nobel Prize for Physiology or Medicine in 1945.31