HPLC Separation of Phenolic Acids on Silica Gels Layer-by-Layer Modified with 6,10-Ionene and Dextran Sulfate

Figure 6

Effect of the acetonitrile content in the mobile phase on the PA retention on SP-2. Acids (100 μg/ml): 1, caffeic; 2, sinapic; 3, salicylic; 4, ferulic; 5, -coumaric; 6, gallic; 7, vanillic.