Emerging graphene-based sensors for the detection of food adulterants and toxicants – A review

•Graphene-based sensors review for trace-level detection of adulterants and toxicants.•Optical, electrical (field-effect) and electrochemical sensing approaches reviewed.•Conjugation with linkers and biomolecules causes sensitive and selective traits.•Overview of graphene-based sensors for portable devices as point-of-need platforms.•Future scope of disruptive graphene-based sensors used for detection in food products.