| Summary: | 碩士 === 輔仁大學 === 食品營養學系 === 90 === The feasibility of removal of polycyclic aromatic hydrocarbons (PAHs) in model systems and roasted duck by sorption on low-density polyethylene (LDPE) was studied. PAHs were identified and quantified using gas chromatography, and the reduction of PAHs adsorbed on LDPE after exposed to UV irradiation was also investigated. Media of aqueous, oil-water, and emulsion were employed in model systems. Results showed that the adsorption of five carcinogenic PAHs on LDPE was increased as duration increased. More than 50 % of the total adsorption was noticed within 24 hours for all PAHs in model systems, and the adsorption rate of PAHs by LDPE was decreased as duration increased after then. The decrease of the adsorbed amounts of benz(a)anthracene, benzo(b)fluoranthene and benzo(a)pyrene in roasted duck packaged vacuum in LDPE bags after 24 hours was found, and the reduction were 8.01 %, 54.27 % and 73.02 %, respectively. No significant decrease of the five PAHs adsorbed on LDPE after UV irradiation (254 nm) for 1 hr was observed. The residual PAHs (ranged 85.92 — 92 %) on LDPE after UV irradiation for 2 hr decreased significantly, and the effect was associated with the increase of irradiation time, except indeno(1, 2, 3-c,d)pyrene. The residual PAHs (ranged 70.75 — 83.97%) in LDPE after irradiation for 3 hours were found to be significantly decreased except indeno(1, 2, 3-c,d)pyrene, and benzo(a)pyrene was noticed as the most sensitive to UV among PAHs. Conclusively, most of the PAHs adsorption on LDPE occurred within 24 hr in the model studies, and the removal of PAHs in roasted meat by sorption on LDPE was achieved. Possible contamination caused by the PAHs on LDPE is avoided by UV irradiation. Therefore, the technology may be achievable and useful.
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