L-Theanine, also known as theanine, is an amino acid unique to tea that plays an important role in the flavor and health benefits of tea. The following is a detailed description of L-Theanine:
1. Basic Information
Chinese name: L-Theanine
English name: L-Theanine
Chemical formula: C7H14N2O3
Molecular weight: 174.198 (or 174.20Da, different sources may vary slightly)
CAS No.: 3081-61-6
EINECS No.: 221-379-0
2. Existence and synthesis
L-Theanine is the characteristic amino acid of tea, and one of the flavor substances of tea, which is strongly positively correlated with the quality of green tea. Among the more than twenty kinds of amino acids in tea, theanine accounts for about 50%~60% of the total amino acids in tea.
L-Theanine is synthesized by glutamic acid and ethylamine under the action of the theanine synthase in the root of the tea tree, then transported to the branches and accumulated in the leaves.
3. Health Benefits
Antioxidant: L-Theanine reduces the synthesis of reactive oxygen species (ROS) and enhances the activity of antioxidant enzymes, thereby attenuating oxidative damage.
Anti-inflammatory: The anti-inflammatory activity of L-theanine has been verified in vitro and in vivo. It can inhibit the nuclear factor κB (NF-κB) pathway, thus reducing the expression of pro-inflammatory factors.
Neuroprotective: L-Theanine has excellent neuroprotective effects against nerve damage and can protect neurons from damage.
Anti-cancer: Although L-theanine itself has no anti-tumor activity, it can improve the efficacy of many anti-tumor drugs.
Anxiety Relief and Tranquilization: L-Theanine has a tranquilizing, tension-reducing and nerve relaxing effect, which can improve sleep quality and relieve anxiety.
Cardiovascular protection: Some studies have shown that L-theanine can lower blood pressure and have a protective effect on the cardiovascular system.
Others: L-theanine also has the effect of promoting brain cell development, improving brain function, antibacterial and so on.
4. Application
Seasoning: L-theanine is one of the flavor components of green tea, which can be used as seasoning.
Nutritional enhancer: Due to its various health benefits, L-theanine can be used as a nutritional enhancer and added to food or beverages.
Dietary supplement: L-theanine is also used as a dietary supplement for daily consumption to obtain its health benefits.
5. Precautions
Although L-theanine has a variety of health benefits, excessive intake may also bring about adverse effects. Therefore, when consuming foods or supplements containing L-theanine, care should be taken to moderate the intake.
For pregnant women, nursing mothers and people with specific medical conditions, it is advisable to consult a doctor’s advice before consuming foods or supplements containing L-theanine.