Determination of luteolin in Chrysanthemum tea with a ultra-sensitive electrochemical sensor based on MoO3/poly(3,4-ethylene dioxythiophene)/gama-cyclodextrin metal–organic framework composites.

• The MoO 3 -PEDOT nanomaterials were prepared by in-situ growth method. • CD-MOF was electrodeposited on the MoO 3 -PEDOT/GCE to form a luteolin electrochemical sensor with outstanding performances. • The sensor was successfully applied for detecting luteolin in both homemade and commercial chrysanthemum tea. Chrysanthemum tea is a tranditional Chinese health drink, which contains luteolin, a flavonoid with vesatile health benefit activities. Herein, A sensitive electrochemical sensor based on composite materials consisting of MoO 3 nanorods, poly (3, 4-ethylene dioxyethiophene)(PEDOT), and γ -cyclodextrin metal–organic framework(CD-MOF) was prepared.The materials were characterized and analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD), fourier transform infrared (FTIR), and X-ray photoelectron spectroscopy (XPS). Due to the synergistic effects of the materials, the sensor showed a wide linear range of 0.4 nM −1800 nM and a low detection limit (LOD) of 0.1 nM (S/N = 3) for luteolin under optimized conditions. Besides, the influences of some coexistent phenolic compounds and common metal ions on luteolin detection were evaluated and no significant interference was observed. Finally, the sensor was successfully applied to the detection of luteolin in real Chrysanthemum tea samples. [ABSTRACT FROM AUTHOR]