Release of synthetic phenolic antioxidants from extruded poly lactic acid (PLA) film

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• 作者：Majid Jamshidian ; Elmira Arab Tehrany ; St¨¦phane Desobry
• 关键词：PLA ; Synthetic phenolic antioxidants ; Release ; D and K coefficients ; Food simulants ; Active packaging
• 刊名：Food Control
• 出版年：2012
• 出版时间：December, 2012
• 年：2012
• 卷：28
• 期：2
• 页码：445-455
• 全文大小：1157 K

文摘

Antioxidant-active packaging is a promising technology for food protection. In this study Poly lactic acid (PLA) granules containing 2 % (w/w) synthetic phenolic antioxidants (SPA) including butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), propyl gallate (PG), and tert-butylhydroquinone (TBHQ) were extruded in a pilot plant extruder. SPA's release from PLA-SPA films into 10 % , 50 % and 95 % ethanol at 20?¡ãC and 40?¡ãC was regularly measured by HPLC system for 60 days. TBHQ partially decomposed to 2-tert-butyl-1,4-benzoquinone (TBBQ) both during extrusion process and release tests under all conditions. Diffusion of the SPAs from PLA to simulants showed a Fick's behavior with diffusion coefficient (D) value between 10^?8 and 10^?11?cm²?s^?1 with 0-100 % of release. Faster and higher release of SPAs occurred at 40?¡ãC according to Arrhenius law. PG and BHT had respectively the highest and lowest release rate in all simulants due to their different molecular properties such as polarity, Log P and molecular volume. Higher ethanol content of simulant and temperature both influenced the PLA hydrolysis during release study; at 40?¡ãC, all PLA films in contact with 50 % ethanol turned opaque and fragile. Total and fast release of SPA into 95 % ethanol at 40?¡ãC and their small release into 10 % ethanol at 40?¡ãC and 20?¡ãC suggests using PLA-SPA active packaging for oils, oily foods and some milk products which are highly sensitive to oxidation to ensure higher food quality. Finally, PLA-antioxidant active packaging approach also permits to reduce the amounts of directly added antioxidants in foods to provide safer foods.