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Abstract: A visual, rapid, and sensitive micro-solid phase extraction method was developed for the detection of p-hydroxybenzoic acid using molecularly imprinted chitosan microspheres based on deep eutectic solvents, both as a functional monomer and template. The parameters were optimized by using the response surface methodology strategy. The extraction capacity of p-hydroxybenzoic acid from pear rind under the optimized conditions using response surface methodology was 46.32 mg/g, when the pH of the extract solution (2), extraction time (35 min), extraction temperature (30℃ ), and adsorbent dosage (2 mg). The molecularly imprinted chitosan microspheres produced higher selectivity and extraction capacity than the traditional materials
Template and target information: p-hydroxybenzoic acid, 4-hydroxybenzoic acid
Author keywords: Deep eutectic solvents, Micro-solid phase extraction, molecularly imprinted chitosan microspheres, p-hydroxybenzoic acid, Response surface methodology