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

Figure 4

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