Sichuan Tongsheng Amino acid Co., Ltd
L-Pyroglutamic acid


Our emphasis on quality assurance has helped Tongsheng gain a reputation worldwide for high quality products and provided our loyal customers confidence in committing to long terms supply agreements.  We are constantly upgrading every aspect of our quality systems in terms of staff training, documentation and analytical capabilities to achieve the highest levels possible. Tongsheng is ISO 9001:2000 certified. Every product we ship includes a Certificate of Analysis with complete detailed information on lot number, product information, date of manufacturing, date of expiry, specification and typical analysis data.   The quality of our products is one of our most significant assets.

We always welcome our customers for visits  and/or audits at a  convenient time.

We constantly seek ways to improve our quality systems and welcome any suggestions from our customers or regulatory groups on how to do this.

We have the following procedures in our quality systems to monitor the quality of products throughout the whole manufacturing process and even up to inventory: 

• Raw Material Quality Inspection (RMQ)
• In-Process Quality Inspection (IPQ)
• Final Product Quality Inspection (FPQ)
• Certificate of Analysis (CoA) for our every lot of products
• Maintain retained samples for each lot for at least one year
• Shelf-life analysis data

List of Analytical Techniques used in the Inspection of Products include: 

• Chemical Titration
• GC
• KF
• Microbial inspection analysis
• Optical activity
• Melting test
• Stability test
• Uv/visible spectrophotometer