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Abstract: In this work, dummy molecularly imprinted polymers with high selectivity and affinity to capsaicin and dihydrocapsaicin are designed using N-vanillylnonanamide as a dummy template. The performance of dummy molecularly imprinted polymers and nonimprinted polymers was evaluated using adsorption isotherms, adsorption kinetics, and selective recognition capacity. Dummy molecularly imprinted polymers were found to exhibit good site accessibility, taking just 20 min to achieve adsorption equilibrium; they were also highly selective toward capsaicin and dihydrocapsaicin. We successfully used dummy molecularly imprinted polymers as a specific sorbent for selectively enriching capsaicin and dihydrocapsaicin from chili pepper samples. In a scaled-up experiment, the selective recovery of capsaicinoids was calculated to be 77.8% using solid-phase extraction. To the best of our knowledge, this is the first example of the use of N-vanillylnonanamide as a dummy template in molecularly imprinted polymers to simultaneously enrich capsaicin and dihydrocapsaicin
Template and target information: N-vanillylnonanamide, dummy template, capsaicin, dihydrocapsaicin
Author keywords: Capsaicinoids, dummy template, molecular imprinted polymers, Solid-phase extraction