Ultrasensitive and selective nanomolar detection of quercetin in 12 complex food matrices via 3D hierarchical SiO₂@MoS₂/MXenes heterostructured sensor

/MXenes electrochemical sensor was 20 nM ∼ 30 μM, and the detection limit was 2 nM. The sensor can be effectively applied to the detection of Que. in 12 kinds of fruits, vegetables and agricultural products, and the results were comparable to those of UV spectrophotometry with satisfactory recovery.