Self-collected 3D nano-adsorbent GR@p(POSS-co-DMAEMA) applied to the dispersive solid-phase microextraction in parabens detection of condiments

In this work, we rationally designed a facile dispersible and self-collectible nano-adsorbent GR@p(POSS-co-DMAEMA) to simplify the dispersive solid-phase microextraction (DSPME). The difficulty of allowing close contact between the nano-adsorbent and donor sample solution was solved, thus improving the extraction ef-ficiency. Furthermore, the GR@p(POSS-co-DMAEMA) with temperature-sensitive property can self-collect at high temperature, simplifying the DSPME steps (7 min). Fabrication and dispersity of GR@p(POSS-co-DMAEMA) were certified by characteristic analyses. Based on above, a method for analyzing four parabens by GR@p(POSS-co-DMAEMA)-DSPME combined with HPLC-UV was established. The feasibility of the method was verified in simulated water targeting four parabens with good precision (RSD%, 1.7-11.3, n = 3) and low detection limits (0.29-0.63 ng mL-1) under optimal conditions. The method was successfully applied to analyze three condi-ments and obtained relative recoveries between 91.20 and 133.71%. The results showed that the proposed method is promising to be a fast, efficient and reliable method for the trace analysis of parabens.