Chromatographic plates were coated with Amberlite IRP-69 (strong-acid cation exchanger in H~+-form) mixed with microcristalline cellulose in different ratios.

• 色谱板用不同比例的苯酚甲醛IRP-69(H~+态强酸阳离子交换体)与微晶纤维素混合物敷涂。