L-theanine Powder

Pure L-theanine Powder Supplier

Guanjie Biotech is a professional Pure L-theanine Powder supplier, dedicated to providing high-quality raw materials for the nutraceutical, food, and beverage industries. Also known as glutamine ethylamine, L-theanine is primarily produced through microbial fermentation or chemical synthesis, with market extracts commonly reaching concentrations of up to 40%. Our premium product features a purity specification of ≥99%, verified by the HPLC detection method to ensure accuracy and consistency. It appears as a white or off-white powder with excellent stability and solubility, making it ideal for capsules, tablets, beverages, and functional foods. CAS No.: 3081-61-6. Guanjie Biotech supports bulk supply, strict quality control, and customized OEM/ODM services for global partners. Welcome to enquire with us at info@gybiotech.com.

 

 

Why Choose Guanjie Biotech​​​​?

Guanjie Biotech combines strong manufacturing capabilities, source-factory advantages, and strict quality control to produce high-quality L-theanine Powder products. We offer customized specifications, including raw powder, pure powder, ratio extracts, and standardized extracts, all produced in our SC-certified food ingredient manufacturing facility. Our independent laboratory supports comprehensive testing, factory test reports, and processing of customer-supplied materials. We can also prepare customized samples on demand at any time. Customers are welcome to visit our factory for on-site inspection. With competitive pricing and consistent quality, we are committed to providing the best products and services. For our L-theanine powder, please contact us at :info@gybiotech.com

 

COA

Item	Specification	Result	Method
Basic Product Information
Genus and Species	Camellia sinensis	Conform	/
Part of the Plant	Leaves	Conform	/
Country of Origin	China	Conform	/
Marker Compounds
L-theanine	>98.0%	98.76%	HPLC
Organoleptic Data
Appearance	Powder	Conform	NLS-QCS-1008
Color	White to off-white	Conform	GB/T 5492-2008
Odor	Characteristic	Conform	GB/T 5492-2008
Taste	Characteristic	Conform	GB/T 5492-2008
Process Data
Method of Processing	Extraction	Conform	/
Solvent(s) Used	Ethanol & Water	Conform	/
Drying Method	Vacuum drying	Conform	/
Excipient	None	Conform	/
Ratio of Extraction	80:1	Conform	/
Physical Characteristics
Melting point	214-215 ℃	214.5℃	GB21781-2008T
Solubility	Soluble in water	Conform	Visual
Particle Size (80 mesh)	98.0%pass 80mesh	Conform	GB/T 5507-2008
Moisture	<2.0%	1.2%	GB/T 14769-1993
Ash Content	<1.0%	0.4%	AOAC 942.05, 18th
Solvent Residue	None	Conform	NLS-QCS-1007
Heavy Metals
Total Heavy Metals	<10 ppm	Conform	USP <231>, method II
Arsenic	<1.0 ppm	Conform	AOAC 986.15, 18th
Lead	<1.0 ppm	Conform	AOAC 986.15, 18th
Mercury	<0.5 ppm	Conform	AOAC 971.21, 18th
Pesticide Residue
666	<0.2ppm	Conform	GB/T5009.19-1996
DDT	<0.2ppm	Conform	GB/T5009.19-1996
Microbiology
Total Plate Count	<1,000cfu/g	72cfu/g	AOAC 990.12, 18th
Total Yeast & Mold	<100cfu/g	10cfu/g	FDA (BAM) Chapter 18, 8th Ed.
E. Coli	Negative	Negative	AOAC 997.11, 18th
Salmonella	Negative	Negative	FDA (BAM) Chapter 5, 8th Ed.

 

 

 

What Is the Source of Pure L-Theanine Powder?

Pure L-theanine Powder, chemically known as N-ethyl-γ-L-glutamine, is a characteristic non-protein amino acid naturally found in tea plants. It is one of the most important functional components in tea and is highly valued in the health supplement, food, and beverage industries. The primary sources of pure L-theanine can be explained by the following three points.

 

1. Natural Source: Tea Plants as the Main Origin

The most important natural source of pure L-theanine powder is the tea plant, Camellia sinensis. L-theanine is considered a signature amino acid of tea and is rarely found in other plants. In addition to tea trees, only a few other species, such as Camellia japonica, Camellia sasanqua, and the mushroom Xerocomus badius, have been reported to contain this compound.

Among all natural sources, tea leaves contain the highest concentration. Studies show that L-theanine accounts for approximately 70% of the total free amino acids in new tea shoots, while its content in fresh tea leaves is generally 1% to 2% of the dry weight. This makes tea leaves the most commercially valuable raw material for the extraction of pure L-theanine powder.

 

2. Distribution Within Different Parts of the Tea Plant

L-theanine is not evenly distributed throughout the tea plant. Its concentration varies significantly depending on the plant part. The highest levels are found in young leaves and tender buds, which are also the main parts used for tea production.

The concentration generally follows this order:
young leaves > root bark and absorbing roots > old leaves > stem bark and xylem tissues

Before the tea tree begins to sprout, nitrogen absorbed by the plant is mainly stored in the roots and leaves in the form of theanine, glutamine, and arginine. Once germination starts, these nitrogen-containing compounds are transported to the growth points and developing shoots. Among them, L-theanine is present at the highest concentration, making new buds and young leaves especially rich sources.

3. Seasonal Variation of L-Theanine Content

The source concentration of L-theanine is also influenced by seasonal changes. The content is usually highest in spring, when tea plants produce fresh shoots and buds. As the growing season progresses, the level gradually declines during summer and may rise slightly again in autumn.

During winter, L-theanine mainly accumulates in the roots of the tea plant as a nitrogen reserve. When spring arrives and the tea tree begins to germinate, the theanine content in the roots decreases because it is transferred to the newly developing shoots.

This seasonal movement is one of the key reasons why spring tea leaves are considered the best natural source for high-purity L-theanine extraction.

These properties make it an important raw material in the nutraceutical market. Guanjie Biotech, as a Pure L-theanine Powder supplier, supports bulk supply and OEM/ODM services for global customers seeking high-quality amino acid ingredients.

 

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