Bubble-driven solid-phase microextraction for the rapid determination of potassium sorbate in oyster sauce by HPLC-DAD

Summary On-site sample preparation has the advantage of combining sampling and sample preparation into a single step, thereby minimising sources of error, and eliminating the risk of analyte instability. Bubble-driven solid-phase microextraction (BD-SPME) was first proposed as an on-site pretreatment method. Oyster sauce underwent on-site pretreatment to measure potassium sorbate levels via high-performance liquid chromatography with a diode array detector (HPLC-DAD), obviating the need for stirrers. The high sensitivity of the HPLC determination of potassium sorbate was obtained using BD-SPME pretreatment with a limit of detection (LOD) of 0.03 mg L −1 and a limit of quantification (LOQ) of 0.10 mg L −1 . The refined technique displayed remarkable linearity from 0.10 to 30.00 mg L −1 , boasting a coefficient of determination R 2 ≥ 0.998. In addition, the recoveries of potassium sorbate in oyster sauce using the method were in the range of 90.8–101.4%. Evidently, BD-SPME in combination with HPLC-DAD is a sensitive and promising analysis for on-site pretreatment.