Hydroxytyrosol reference substance is a primary reference standard with certified absolute purity (considering chromatographic purity, water, residual solvents, inorganic impurities).
The substance appears as liquid or white powder dependent on temperature or crystallization grade. The exact weight is given on the label of the vial. In order to produce a stock solution of known concentration please transfer the contents of the vial quantitatively into a volumetric flask by repeated rinsing with excess solvent and then fill to the mark.
soluble in methanol
usually a stock item
in styrofoam box together with deep frozen gel packs