Reduced graphene oxide-zinc iron oxide nanomaterial as selective dispersive solid-phase extraction sorbent for extraction and enrichment of aflatoxins from milk combined with UHPLC-MS/MS analysis

•Evaluation of graphene oxide-based nanomaterial (rGO-Zn/Fe2O4) as d-SPE sorbent for extraction of aflatoxins.•Different parameters of the d-SPE method were optimized by the matrix spiked technique.•The developed d-SPE combined with UHPLC-MS/MS analysis exhibited good selectivity, sensitivity, linearity, and applicability.•The AFM1 levels in milk samples were within the regulatory limits.