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 FeO nanoparticles. The obtained chrysin/SMIPs showed favorable binding ability towards chrysin with 35.27 mg·g maximum adsorption capacity in 20 min, prominent reusability with 9 cycles of adsorption–desorption and superior specific recognition with imprinting factor () of 2.87 and selectivity coefficient () 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.

中文翻译：

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磁性表面分子印迹聚合物高效选择性识别并快速富集白杨素

白杨素作为一种重要的天然营养类物质，在保健食品领域备受期待。为了实现对白杨素的特异性和高效吸附，通过甲基丙烯酸自由基聚合到功能化磁性 Fe3O 纳米粒子的表面来制备磁性表面分子印迹聚合物（白杨素/SMIPs）。所得白杨素/SMIPs对白杨素具有良好的结合能力，20 min最大吸附容量为35.27 mg·g，可重复使用9次吸附-解吸，具有优异的特异性识别能力，印迹因子()为2.87，选择性系数()为8.74 、5.64 和 8.64 分别对应于染料木黄酮、大豆黄酮和槲皮素的干扰物。此外，白杨素/SMIPs在从真实蜂胶样品中提取白杨素时表现出较高的回收率（91.13%至95.12%）和精密度（RSD为2.51%至1.32%）。因此，白杨素/SMIPs对于保健食品中白杨素的选择性富集回收具有广阔的应用前景。