Zhejiang Tianrui Chemical Co., Ltd.
Main products:L-Theanine
Contact Us
  • Contact Person : Ms. Zhang Nina
  • Company Name : Zhejiang Tianrui Chemical Co., Ltd.
  • Tel : 86-570-7222999
  • Fax : 86-570-7222998
  • Address : Zhejiang,LongYou,XingYe Road, South Industrial Zone, LongYou County
  • Country/Region : China
  • Zip : 324400

L-Pyroglutamic Acid

L-Pyroglutamic Acid
Product Detailed
1.Reference standard: AJI92/USP24 2.Our L-Pyroglutamic acid are manufactured at cGMP conditions. 3.soluble in water

L-Pyroglutamic Acid

1.L-Pyroglutamic acid can be used in:                                         

2.Food Industry;                        

3.Cosmetic industry;                     

4.Pharmaceutical Industry;               

Product Data Sheet

Product Characteristics

Product name

 L-Pyroglutamic acid



L-5-Oxo-2-pyrrolidinecarboxylic acid;

(S)-2-Pyrrolidone-5-carboxylic acid                                                                                                



 Molecular Weight


 CAS number


Product Profile


 White crystalline powder


 99.0% to 101.0%

Specific rotation (a) 20/D (C=2, H2O)

 -11 to -12 Degree


 Not less than 98.0%

Melting point

 158.0 °C to 161.0 °C  

Chloride (Cl)

 NMT 0.02%

Ammonium (NH4)

 NMT 0.02%

Sulfate (SO4)

  NMT 0.02%

Heavy metals (as Pb)

  NMT 10 ppm

Iron (Fe)

 NMT 10 ppm

Arsenic (As2O3)

 NMT 1 ppm

Loss on drying

 NMT 0.50%    

Residue on ignition

 NMT 0.1% 


Shelf life             24 months from date of production

Storage              Keep in dry, dark, ventilated place



√ KOSHER certified

√ HALAL certified

√ HACCP Certification

√ ISO 22000 Food Safety Management System Certification

√ ISO 14001 Environmental Management System Certification

√ Complying with FCC, JP, AJI & Chinese Pharmacopeia standards

√The principal product, L-Theanine, High Purity, High Specific Rotation, Top Quality

√ First domestic L-Theanine manufacturer through USP audit

About Us:

Zhejiang Tianrui Chemical CO., Ltd., situated in south industrial zone of Longyou county, Zhejiang province, China, is a high-tech enterprise, specializing in R & D, production, sales and technical services of L-Theanine, L-Pyroglutamic acid, L-Glutamic acid etc.

Our plant is designed, built and operated according to the standards of pharmaceutical enterprises. Perfect quality control and quality assurance systems are established in accordance with ICH Q7 Guidelines. Our company are ISO22000 and ISO14001 certified. Our products obtained USP, HACCP, KOSHER, HALAL and other international certificates. We are authorized to the right of import and export, established business relationships with companies from more than 30 countries and areas, with good reputation. Adhering to the top R & D capacity and the excellent quality, we are the largest professional L-Theanine with top productivity and sales in China, gradually establishing brand advantage.


Leading Technology

We specialized in production of L-Theanine for many years, with competitive advantages in technology. Through cooperation with domestic and foreign higher education institutes, and institutes of biology, we always focus on the improvement of product quality and development of new production process. Our production technology keeps pace with the international advanced level, with product quality in a leading position among the industry.

Quality Assurance and Quality Control

Our products are manufactured in production workshops in line with cGMP standards, class D clean room for drying and packaging, separate quality control lab, even professional L-Theanine technology development center, to ensure product quality.  

We built effective, reasonable production management systems. Production procedures conform to ISO22000 Food Safety Management System and requirements of cGMP. We have stringent quality control system from raw materials to finished products. We also built perfect quality-tracking system to ensure the traceability of products from raw materials, production to after-sales service, through establishing files and keeping samples according to the batch number, regularly obtaining the data of stability test.


As a leading corporation in L-Theanine industry, we comply with environment-friendly requirements from selection of raw materials, improvement of production process to use of packaging. Our company completed environmental researches such as tail gas receiving and comprehensive utilization of circulating water, with innovative product ecological safety control system.

L-Pyroglutamic Acid

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