▎ 摘　　要

A reliable and inexpensive pretreatment procedure in the determination of beta(2)-agonists in pork was developped. The procedure used a nanocomposite of multiwalled carbon nanotubes (CNTs) functionalized with graphene (rGO) as the reversed dispersive sorbent. It was analyzed after purification by high-performance liquid chromatography, the extraction time and the properties of the nanocomposite were optimized. Under optimized conditions, present method has linear response over concentration range of 0.5-50 ng/mL in pork samples with a satisfactory detection limit close to 0.1 ng/mL. The precisions of the current method (coefficient of variation) are lower than 5%, while recoveries are more than 98.3%. The nanocomposite exhibited high adsorptivity, long-term storage stability, satisfactory anti-interfering activity and high selectivity toward beta(2)-agonists compared with those of rGO and CNTs. (C) 2018 "Society information". Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.