l-Theanine: An astounding sui generis integrant in tea

Area of Science:

• Nutraceutical Science
• Food Chemistry
• Neuroscience

Background:

• L-theanine (l-Th) is a non-protein amino acid found in tea, valued as a nutraceutical and food additive.
• Its umami taste enhancement is limited by inadequate production, necessitating diverse sourcing strategies.
• L-theanine exhibits significant physiological effects, particularly in central nervous system (CNS) regulation and oncology.

Purpose of the Study:

• To review recent research on L-theanine (l-Th).
• To highlight its biological sources, production methods, and physiological roles in human health.
• To discuss future prospects for l-Th utilization.

Main Methods:

• Literature review of in vitro, in vivo, and clinical studies.
• Analysis of extraction, chemical synthesis, and microbial transformation methods for l-Th production.
• Examination of l-Th's biochemical modulation and bioavailability enhancement.

Main Results:

• L-theanine demonstrates neuroprotective effects, aiding in CNS disorders like Alzheimer's and exhibiting anti-stress properties.
• It enhances the bioavailability of anti-neoplastic agents in tumor cells.
• Current production methods struggle to meet the demand for l-Th.

Conclusions:

• L-theanine is a promising compound for CNS health and cancer therapy.
• Further research into efficient production methods is crucial for its broader application.
• L-theanine holds significant potential as a functional ingredient in food and pharmaceuticals.