Alternative Names for L-Theanine
L-theanine is also known as theanine, γ-glutamylethylamide, N-ethyl-L-glutamine, and delta-glutamylethylamide 1, 2, 3, 4.
Chemical Nomenclature
The compound has several scientifically recognized names based on its chemical structure:
- Theanine - The shortened common name used in medical literature and perioperative guidelines 1
- γ-glutamylethylamide - The systematic chemical name describing its structure as a glutamate derivative 2
- N-ethyl-L-glutamine - An alternative systematic name emphasizing its relationship to glutamine 3
- delta-glutamylethylamide - Another chemical nomenclature variant 4
Clinical Context
In perioperative medicine, the substance is referred to simply as "theanine" in consensus guidelines, where it is classified as a dietary supplement that should be held 24 hours before surgery due to its dose-dependent blood pressure lowering effects and rapid metabolism 1. The compound is described as a derivative of glutamate with CNS depressant properties 1.
In research literature, L-theanine is consistently identified as a unique non-protein amino acid naturally found in tea leaves (Camellia sinensis), where it contributes to the umami taste of green tea 2, 5, 6.
Important distinction: Do not confuse L-theanine with L-glutamine, which is a different amino acid used in parenteral nutrition and has distinct clinical applications 7, 8.