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Simultaneous analysis of trace polymer additives in plastic beverage packaging by solvent sublation followed by high-performance liquid chromatography.

Using solvent sublation (SS), a novel pretreatment method for separating and concentrating antioxidants and ultraviolet absorbers from plastic beverage packaging was developed, and these target compounds were quantitatively analyzed by high-performance liquid chromatography (HPLC). In the pretreatment section, the effects of the sublation solvent, solution pH, NaCl concentration, nitrogen flow rate, sublation time, and light condition on the sublation efficiency were investigated in detail and the optimal conditions of the solvent sublation process were selected. The analytical method of SS-HPLC showed good linearity in the range from 0.33 to 667 ng/mL with good presenting regression coefficients (0.9995 ≥ R(2) ≥ 0.9972). Low limits of detection (LODs) of 0.34-1.25 ng/mL and limits of quantification (LOQs) of 1.13-4.15 ng/mL were achieved. The mean recoveries were in the range from 88.73 to 107.65% at 20, 30, and 40 ng/mL spiked levels, and the relative standard deviations (RSDs) were in the range from 2.16 to 10.55%.