Determination of Phenolic Acids in Sugarcane Vinasse by HPLC with Pulse Amperometry

Figure 5

Plot of applied potential versus peak current for all analytes. Left axis (black symbols): CA: caffeic acid (3.60 mg·L⁻¹); FA: ferulic acid (3.88 mg·L⁻¹); p-COA: p-coumaric acid (3.28 mg·L⁻¹). Right axis (white symbols): GA: gallic acid (3.40 mg·L⁻¹); VA: vanillic acid (3.36 mg·L⁻¹). Mobile phase: 0.20 mol·L⁻¹ acetate buffer (pH 5.0)/ultrapure water (80 : 20 v/v). Other experimental conditions are as shown in Figure 4.