4.6. Standard Solutions
ALDRICH
Standards used for qualitative and quantitative determination of cannabidiol (CBD) and its metabolites 7-hydroxy-cannabidiol (7-OH-CBD) and 7-carboxy-cannabidol (7-COOH-CBD) were purchased from Cerilliant, Sigma Aldrich (Round Rock, TX, USA), as certified reference solutions in methanol 1 mg/mL each (Product codes: C-045-1ML, C-180-1ML and C-181-1ML, respectively).