Highly-efficient selective recognition and rapid enrichment of chrysin by magnetic surface molecularly imprinted...

As an important natural nutrient-like substance, chrysin is highly desirable in the field of health food. Here, to achieve the specific and efficient adsorption of chrysin, a magnetic surface molecularly imprinted polymer (chrysin/SMIPs) was fabricated by free radical polymerization of methacrylic acid onto the surface of functionalized magnetic Fe₃O₄ nanoparticles. The obtained chrysin/SMIPs showed favorable binding ability towards chrysin with 35.27 mg·g^-1 maximum adsorption capacity in 20 min, prominent reusability with 9 cycles of adsorption-desorption and superior specific recognition with imprinting factor (IF) of 2.87 and selectivity coefficient (K) of 8.74, 5.64 and 8.64 corresponding to the interferents of genistein, daidzein and quercetin, respectively. Moreover, the chrysin/SMIPs showed high recoveries (91.13 % to 95.12 %) and precisions (RSDs from 2.51 % to 1.32 %) in the extraction of chrysin from real propolis samples. Therefore, chrysin/SMIPs is highly promising for the selective enrichment recovery of chrysin in health food.