For definitive analytical data on any product always use the batch specific datasheet provided.
The product data shown on our website and promotional literature is for information only, as during manufacture small changes in the degree of hydration of the product, or a difference in the nature of the salt counter ion can occur which can result in minor batch to batch variation. This has no effect of the overall biological properties of the material. A more detailed explanation for these effects is given below:
Molecular Weights & Formulas : The molecular weight and formula displayed represent the product as shown by the chemical structure. During manufacture it is common for water of hydration to be incorporated with the product. The degree to which this occurs can vary from batch to batch and as a consequence the molecular weight of the material supplied can change. Additionally, we may add or change a salt from that stated in the catalog. Any change is clearly stated on the vial labels and accompanying product datasheets; any variation should not affect the basic pharmacological properties of the compound. Consequently solutions should only be made up using the molecular weight as stated on the product datasheets and vial labels.
Bioactive chemical purity : Tocris bioactive chemicals are of exceptional high purity, typically > 98%. This value will naturally differ very slightly between batches and hence the value quoted on the Certificate of Analysis (COA) provided with your product may differ from that quoted here on the web site and in our catalog. Chemical purity is assessed using an array of techniques including HPLC, chiral HPLC, NMR, microanalysis, high voltage electrophoresis, melting point, optical rotation, TLC and mass spectrometry. In all cases we believe that the purity of any material supplied by Tocris will match or exceed the purity of the product originally reported in the scientific literature. For purity of an individual product please consult the Certificate of Analysis (COA) provided with your product, or use the 'view current batch' facility on the product page of the web site.
Chemical Abstracts Registry (CAS) numbers : The Chemical Abstracts Service (CAS) number is a unique identification code assigned to a chemical substance by the American Chemical Society. While these are given as accurately as possible they may not reflect the salt or level of hydration of the product supplied.