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Molar ratio of 18β-glycyrrhetinic acid molecules to functional group content of (A) modified SBA-15 silicas and (B) modified Aerosil® siliacas. The ratio calculated from maximum adsorption capacity established from nonlinear fitting analysis. Isotherms: D-A, Dubinin-Astakhov; D-R, Dubinin-Radushkevich; L, Langmuir.
