| Summary: | 碩士 === 國立中興大學 === 化學系所 === 96 === Plastics are the most commonly using materials for the food packaging. All polymeric materials are oxygenated during processing and usage. Therefore, it is necessary to add antioxidants to all polyalkenes in order to slow down their degradation and oxidation. These polymeric additives may leach from plastic containers into foods and beverages during the processing or storage.
In this study, we developed an analytical method to determine the trace amount of antioxidants leaching from plastic packaging into water by hollow fiber liquid-phase microextraction (HF-LPME) coupled with gas chromatography-mass spectrometry (GC-MS). Three synthetic antioxidants, butylhydroxyanisole (BHA), butylhydroxytoluene (BHT), and bisphenol A (BPA) were successfully extracted from aqueous samples using HF-LPME procedure. The HF-LPME extraction parameters such as the extraction solvent, stirring rate, extraction time, hollow fiber length and salt concentration were optimized using spiked water samples. The linear range for BHA, BHT were 0.5~50 ng/mL, and BPA was 0.1~100 ng/mL. The detection limits were 0.07 ng/mL for BHA, 0.3 ng/mL for BHT, and 0.1 ng/mL for BPA. The results of this study reveal the adequacy of HF-LPME/GC-MS method for analyzing the antioxidants leached from plastic containers. The concentrations of BHT leached from plastic containers into water were 0.51 ng/mL and 0.57 ng/mL for polycarbonate (PC) and polystyrene (PS), respectively. This new simple method is affordable, efficient and convenient for extraction and determination of very low concentration of antioxidants in aqueous samples.
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