作者：Ying-Wen Qiana,b, Xia Honga,b, Cai-Xia Yuana,b,∗, Xin-Kui Zhoua,b, Hai-Ning Hea,b, Dong-Shuai Wanga,b

  关键词：High-performance liquid chromatography Graphene Multiwalled carbon nanotube Ractopamine Salbutamol

  内容：Areliable and inexpensive pretreatment procedure in the determination of 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 highperformance 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 2-agonists compared with those of rGO and CNTs.