Release Kinetics of Tocopheroland Quercetin fromBinary Antioxidant Controlled-Release Packaging Films

다국어 초록 (Multilingual Abstract)

<P>This paper investigated the feasibility of manipulatingpackagingpolymers with various degrees of hydrophobicity to release two antioxidants,tocopherol and quercetin, at rates suitable for long-term inhibitionof lipid oxidation in food. For example, one antioxidant can be releasedat a fast rate to provide short-term/intermediate protection, whereasthe other antioxidant can be released at a slower rate to provideintermediate/long-term protection of lipid oxidation. Controlled-releasepackaging films containing tocopherol and quercetin were producedusing ethylene vinyl alcohol (EVOH), ethylene vinyl acetate (EVA),low-density polyethylene (LDPE), and polypropylene (PP) polymers;the release of these antioxidants to 95% ethanol (a fatty food simulant)was measured using UV–vis spectrophotometry, and Fickian diffusionmodels with appropriate initial and boundary conditions were usedto fit the data. For films containing only quercetin, the resultsshow that the release of quercetin was much faster but lasted fora much shorter time for hydrophilic polymers (EVOH and EVA) than forhydrophobic polymers (LDPE and PP). For binary antioxidant films containingtocopherol and quercetin, the results show that tocopherol releasedmore rapidly but for a shorter period of time than quercetin in LDPEand EVOH films, and the difference is more pronounced for LDPE filmsthan EVOH films. The results also show the presence of tocopherolcan accelerate the release of quercetin. Although none of the filmsproduced is acceptable for long-term lipid oxidation inhibition, thestudy provides encouraging results suggesting that acceptable filmsmay be produced in the future using polymer blend films.</P><P><B>Graphic Abstract</B>
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