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Glutamine wasn't "invented" in the traditional sense, as it's a naturally occurring amino acid found in the human body and in many foods. However, I can provide some key information about its discovery and early research:

1. Discovery: 

Glutamine was first isolated in 1883 by German chemists Ernst Schulze and Ernst Bosshard from sugar beet juice.

2. Structure determination: 

Its chemical structure was determined in 1932 by Hans Pringsheim.

3. Synthesis: 

The first synthesis of glutamine was achieved in 1933 by Norman Wingate Pirie and Harry Melville.

4. Importance in metabolism: 

The role of glutamine in human metabolism was further elucidated by Sir Hans Adolf Krebs, who won the Nobel Prize in Physiology or Medicine in 1953 for his discovery of the citric acid cycle (which is related to glutamine metabolism).

5. Medical applications:

In the latter half of the 20th century, researchers like Douglas Wilmore and others began to explore the therapeutic potential of glutamine supplementation.

So while glutamine wasn't invented by a single person, its discovery and understanding have been the result of work by many scientists over more than a century.