L-组氨酸/L-a-氨基-β-4-咪唑基丙酸

TraceCERT®这个名字，来源于英文单词Traceability（可溯源性）和CERTified（认证）。TraceCERT®认证标准物质溶液，可溯源到至少2家标准权威机构（NIST、BAM等），并且其生产通过了ISO/IEC 17025和 ISO Guide 34 双重认证，这也被称“黄金标准”认证，即使再苛刻的分析条件，也都能满足。更多详细信息，欢迎访问我们的网站：http://www.sigmaaldrich.com/analytical-chromatography/analytical-standards/application-area-technique/tracecert.html

This certified reference material (CRM) is produced and certified in accordance with ISO/IEC 17025 and ISO Guide 34. This CRM is traceable to SI unit kg and measured against NIST- and BAM-CRM.
Certified content incl. uncertainty and expiry date are given on label.
Download your certificate at: http://www.sigmaaldrich.com.