Figure 5.

Products obtained by the action of tyrosinase on dopaxanthin and discrimination between the products associated to the oxidation of the (2S/S)- and (2S/R)-forms. HPLC recordings show the analysis of the products derived from the action of 6 μg mL⁻¹ of tyrosinase on 20 μm solutions of semisynthetic (A) and natural (B) dopaxanthin. Arrows indicate the products derived from (2S/R)-dopaxanthin, not present in B. Reaction was stopped in both cases after 50 min of reaction. Full scale is A₄₈₀ = 0.020 absorbance units.