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

Figure 3

PA retention factors from buffer pH at SP-1 sorbent. Acids (100 μg/ml): 1, caffeic; 2, sinapic; 3, ferulic; 4, -coumaric; 5, salicylic; 6, syringic; 7, gallic.