Application of the liquid–liquid dispersed microextraction based on phase transition behavior of temperature sensitive polymer to rapidly detect 5 BPs in food packaging

•A rapid and green method was developed to detect bisphenols in food packaging.•Temperature sensitive polymer was used as extraction in DLLME.•Dispersant and centrifugation were not required in analyzation.•The extraction was collected with ionic strength and non-co-solvent effect. In this paper, temperature sensitive polymer p(MAH-β-CD-co-NIPAM) was used as extraction in DLLME, because its phase transition behavior can be observed at room temperature due to Hofmeister and non-co-solvent effect. The whole pretreatment process is simple and fast, and the extraction process did not require dispersant to assist dispersion and centrifugation to collect the adsorbent. A new analytical method based on DLLME coupled with HPLC-UV was developed to detect five types of BPs in milk and take-out packaging. The limits of detection ranged from 0.44 to 1.60 ng mL−1 (S/N = 3). The relative recoveries of 5 BPs in food packaging were in the range of 91.08–108.04%.