Paul Karrer

Paul Karrer
Name	Paul Karrer
Caption	Paul Karrer
Birth date	21 April 1889
Birth place	Winterthur, Switzerland
Death date	18 June 1971
Death place	Zurich, Switzerland
Nationality	Swiss
Fields	Organic chemistry, Natural products chemistry, Vitamin chemistry
Workplaces	University of Zurich, University of Oslo
Alma mater	Swiss Federal Institute of Technology Zurich
Doctoral advisor	Alfred Werner
Known for	Structure and synthesis of carotenoids, research on vitamins A and B2
Awards	Nobel Prize in Chemistry (1937)

Paul Karrer was a Swiss organic chemist whose work on the structure and synthesis of plant pigments and vitamins established foundational knowledge in organic chemistry and nutritional science. He conducted pivotal studies on carotenoids, flavonoids, and the riboflavin (vitamin B2) series that influenced contemporaries across European laboratories and informed later biochemical and pharmaceutical research. Karrer's investigations contributed to the chemical elucidation of vitamins A and B2 and earned him the Nobel Prize in Chemistry in 1937.

Early life and education

Karrer was born in Winterthur, Switzerland, into a family connected with the industrial and civic circles of the canton of Zurich. He undertook his higher education at the Eidgenössische Technische Hochschule in Zurich, where he studied chemistry under prominent figures including Alfred Werner and became immersed in the growing European networks centered on organic and coordination chemistry. During his doctoral studies he engaged with analytical techniques and synthetic methodology that linked him to contemporaries at institutions such as the University of Zurich, the University of Basel, and technical schools across Germany and France. His early training placed him in contact with chemical communities in cities like Berlin, Munich, and Paris, where debates over structure determination and stereochemistry were shaping modern organic chemistry.

Scientific career

Karrer’s scientific career spanned laboratory leadership, teaching, and international collaboration. After completing his doctorate he worked on natural products in Zurich and undertook research visits to laboratories in Germany and Scandinavia, forging links with researchers at the University of Oslo and the University of Copenhagen. Appointed to a professorship he established a program that combined isolation techniques, ultraviolet and visible spectroscopy, and chemical degradation to determine structures of pigments and vitamins. His laboratory contributed to the corpus of work in natural product chemistry alongside groups led by contemporaries at institutions such as the University of Cambridge, the University of Göttingen, and the University of Paris. Karrer published extensively in journals read by chemists at the Royal Society, the German Chemical Society, and the Swiss Chemical Society.

Research on vitamins and Nobel Prize

Karrer carried out systematic studies on carotenoids, the chromophores found in plants and photosynthetic bacteria, and on flavins, which include the vital riboflavin (vitamin B2). Through partial syntheses, degradation studies, and correlation of spectral properties, he demonstrated the structural relationships between carotene, retinene derivatives, and vitamin A activity identified earlier by researchers in the United States and Europe. His elucidation of the chemical constitution of riboflavin clarified the connection between yellow pigments found in milk, eggs, and yeast and their biological role, linking his findings to nutritional studies emerging from laboratories at the University of Cambridge, the University of Minnesota, and the Pasteur Institute. For these achievements the Nobel Committee awarded him the Nobel Prize in Chemistry in 1937, recognizing his contributions to the chemistry of natural products and vitamins and placing him among laureates associated with institutions such as the Karolinska Institute and the Royal Swedish Academy of Sciences.

Academic appointments and mentorship

Karrer held a long-term professorship at the University of Zurich, where he directed research and taught generations of students who later occupied chairs across European and North American universities. He supervised doctoral candidates and postdoctoral researchers who went on to positions at the Swiss Federal Institute of Technology, the University of Oslo, the University of Leipzig, and research laboratories in industry such as those of I.G. Farben and pharmaceutical firms in Switzerland. His laboratory practice emphasized rigorous organic synthesis, structural proof via degradation, and integration with analytical advances made at institutions like the University of Göttingen and the Technische Hochschule in Munich. Karrer also participated in international congresses hosted by societies such as the International Union of Pure and Applied Chemistry and maintained collaborative ties with scientists at the University of Vienna and the University of Strasbourg.

Awards and honors

Beyond the Nobel Prize in Chemistry, Karrer received numerous honors from European academies and learned societies. He was elected to national academies including the Royal Swedish Academy of Sciences and was honored by scientific bodies in Switzerland, Germany, and Scandinavia. Universities including the University of Oslo and technical institutes in France and the United Kingdom conferred honorary doctorates and medals; professional organizations such as the Swiss Chemical Society and the German Chemical Society acknowledged his contributions through lectureships and prizes. His work was cited by later laureates and by scholars working at institutions such as the Pasteur Institute, the Rockefeller Institute, and the Max Planck Society.

Personal life and death

Karrer’s personal life was centered in Zurich, where he balanced laboratory leadership with family and civic engagement in cantonal cultural circles. He maintained an interest in classical music and supported scientific societies and museums in Switzerland and neighboring countries. He retired from active teaching but continued to publish and advise researchers until late in life. Paul Karrer died in Zurich in 1971, leaving a legacy carried on by students and institutions across Europe and North America.

Category:Swiss chemists Category:Nobel laureates in Chemistry Category:1889 births Category:1971 deaths