Magnetic solid phase extraction Active esters 1 Adsorption 1 Adsorption behavior 1 Adsorption behaviour 1 Alternative method 1 Esters 1 Extraction 1 Fe3O4-MCM-41 1 Graphene 1 Graphene oxide nanocomposites 1 Graphene oxide/polyacrylamide/Fe3O4 1 Graphene oxide/polyacrylamide/fe3O4 1 Graphene oxides 1 Liquid-liquid extraction 1 MCM-41 1 Magnetic solid-phase extractions 1 Magnetism 1 Nanocomposites 1 Odor-active ester 1 Odor-active esters 1 Odors 1 Organophosphorus pesticides 1 Phase separation 1 Strong-aroma type of baijiu 1 Strong-aroma types of Baijiu 1