d) Absolute content
The content of water and residual solvents, carried out with the specific Phytochem® drying technique is determined by means of validated analytical methods and used as a correction factor for calculation of absolute content.

c) Purity of compound
The purity of the research Standards is defined by selective HPLC analysis and checked with specific TLC methods whereby the presence of other difficult detectable impurities can be discovered. The documentation contains chromatograms, certificate of analysis and safety data sheet.