Adsorption of three selected flavonoids with humic fraction‐modified silica gel in hexane: A mechanism study

Three selected flavonoids, commonly found in spices, red‐purple fruits, and vegetables, were adsorbed on humic fraction‐modified silica gel in hexane. The percentage of adsorption in hexane for all examined analytes was nearly 100% after 1 hr, as a result of the strong dipole–dipole interaction. The increasing amount of adsorbent involved in the process improved the percentage of adsorption, which in turn shortened the time needed to reach the...