Gunnar Blix

1894 - 1981

Gunnar Blix (1894–1981): The Architect of Sialic Acid Research

Gunnar Blix was a towering figure in 20th-century Swedish biochemistry whose work laid the foundation for the modern field of glycobiology. As a long-time professor at Uppsala University, Blix transitioned medical chemistry from a descriptive discipline into a rigorous molecular science. His discovery and characterization of sialic acids—sugar molecules that play critical roles in cellular recognition and viral infection—remain his most enduring legacy.

1. Biography: From Lund to the Rectorate of Uppsala

Fritiof Gunnar Blix was born on September 7, 1894, in Lund, Sweden. He began his academic journey at Lund University, where he studied medicine. However, his interests quickly pivoted toward the chemical underpinnings of biological processes.

In 1930, Blix moved to Uppsala University, an institution that was then becoming a global epicenter for biochemical research. He was appointed Professor of Medical and Physiological Chemistry in 1937, a chair he held until 1961. Beyond the laboratory, Blix was a formidable academic administrator. He served as the Rector Magnificus (President) of Uppsala University from 1955 to 1961, guiding the institution through a period of significant post-war expansion. He passed away in 1981, leaving behind a family legacy of public service; his son, Hans Blix, would later become a world-renowned diplomat and Director General of the IAEA.

2. Major Contributions: The Discovery of Sialic Acids

Blix’s primary research focus was the chemistry of "mucins"—the slippery glycoproteins found in saliva and mucous membranes. This led to his most significant breakthroughs:

Discovery of Sialic Acid (1936): While studying bovine submaxillary mucin (saliva), Blix isolated a previously unknown acidic carbohydrate. He initially named it "sialic acid" (from the Greek sialon for saliva). Simultaneously, the German chemist Ernst Klenk discovered a similar substance in brain lipids, which he called "neuraminic acid."
Chemical Characterization: Blix was instrumental in determining that these substances were actually a family of amino-containing sugars. He worked tirelessly to elucidate the structure of $N$-acetylneuraminic acid (NANA), the most common member of the sialic acid family.
Electrophoresis of Blood Proteins: In collaboration with the Nobel laureate Arne Tiselius, Blix applied the newly developed moving-boundary electrophoresis to study blood plasma. He was among the first to characterize the distribution of lipids and carbohydrates among different globulin fractions in human serum.
Hyaluronic Acid Research: Blix performed early, influential studies on the physical chemistry of hyaluronic acid, a major component of connective tissue, helping to explain its role in joint lubrication and tissue structure.

3. Notable Publications

Blix was a prolific writer whose papers transitioned from early descriptive physiology to advanced molecular structural analysis.

"Über die Kohlenhydratgruppen des Submaxillarismucins" (1936): Published in Hoppe-Seyler's Zeitschrift für physiologische Chemie, this is the landmark paper where he first describes the isolation of sialic acid.
"The carbohydrate moieties of the water-soluble human blood group A substance" (1950): A key study in Acta Chemica Scandinavica that explored the link between sugars and blood type specificity.
"Sialic Acids" (1958): A comprehensive review in Nature that helped standardize the nomenclature and chemical understanding of these molecules globally.
"Structure of Sialic Acids" (1952): A critical paper that began to unmask the nine-carbon backbone of the molecule.

4. Awards & Recognition

While Blix did not receive the Nobel Prize himself, he was the "gatekeeper" of the award for many years and was highly decorated within the scientific community:

Member of the Royal Swedish Academy of Sciences (1944): Elected for his contributions to medical chemistry.
The Nobel Committee: Blix served as a member and eventual Chairman of the Nobel Committee for Chemistry, wielding immense influence over the recognition of global scientific achievements.
Honorary Doctorates: He received honorary degrees from several prestigious institutions, including the University of Oslo and the University of Zurich.
Björkén Prize (1956): Uppsala University’s highest scientific honor, awarded for his work on the chemistry of glycoproteins.

5. Impact & Legacy: The Birth of Glycobiology

Gunnar Blix is often cited as a founding father of Glycobiology. Before his work, carbohydrates were often viewed merely as energy sources (like glucose). Blix showed that complex sugars on the surfaces of cells are sophisticated "information carriers."

His work on sialic acids proved vital for:

Virology: It was later discovered that the influenza virus attaches to sialic acids on the surface of lung cells to initiate infection.
Immunology: Sialic acids are now known to act as "self" signals, preventing the immune system from attacking the body’s own cells.
Cancer Research: Changes in sialic acid patterns on cell surfaces are now used as markers for tumor progression and metastasis.

6. Collaborations

Blix’s career was defined by his role in the "Uppsala School" of biochemistry, characterized by high-tech instrumentation and interdisciplinary work.

Arne Tiselius: Blix worked closely with Tiselius, utilizing his electrophoresis apparatus to separate complex biological molecules.
Ernst Klenk & Alfred Gottschalk: Although Klenk was initially a rival in the race to identify sialic acid, the three men (Blix, Klenk, and Gottschalk) eventually collaborated on a unified nomenclature for the field in the 1950s, a rare example of scientific harmony overcoming ego.
Lennart Rodén: One of Blix’s most famous students, Rodén went on to become a leading figure in the study of proteoglycans.

7. Lesser-Known Facts

The Nomenclature Peace Treaty: In the mid-1950s, the field was confused because Blix called the molecules "sialic acids" and Klenk called them "neuraminic acids." In 1957, Blix hosted a meeting that resulted in a compromise: "Neuraminic acid" would refer to the core 9-carbon structure, while "Sialic acid" would be the group name for all derivatives.
Public Health Advocate: During World War II, Blix was deeply involved in Swedish nutrition research, investigating how to maintain the health of the population during food shortages and rationing.
A Family of Influence: His son, Hans Blix, famously led the UN weapons inspections in Iraq in 2003. The elder Blix’s reputation for rigorous, objective analysis is often cited as a major influence on his son’s diplomatic style.
Centennial Recognition: In 1994, on the 100th anniversary of his birth, the international scientific community held several symposia in his honor, cementing his status as a pioneer whose work only grew in importance as technology caught up to his theories.