Department of Food Science, School of Environmental and Biological Sciences, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08901, United States.
J Agric Food Chem. 2012 Apr 4;60(13):3492-7. doi: 10.1021/jf2045813. Epub 2012 Mar 23.
This paper investigated the feasibility of manipulating packaging polymers with various degrees of hydrophobicity to release two antioxidants, tocopherol and quercetin, at rates suitable for long-term inhibition of lipid oxidation in food. For example, one antioxidant can be released at a fast rate to provide short-term/intermediate protection, whereas the other antioxidant can be released at a slower rate to provide intermediate/long-term protection of lipid oxidation. Controlled-release packaging films containing tocopherol and quercetin were produced using 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 diffusion models with appropriate initial and boundary conditions were used to fit the data. For films containing only quercetin, the results show that the release of quercetin was much faster but lasted for a much shorter time for hydrophilic polymers (EVOH and EVA) than for hydrophobic polymers (LDPE and PP). For binary antioxidant films containing tocopherol and quercetin, the results show that tocopherol released more rapidly but for a shorter period of time than quercetin in LDPE and EVOH films, and the difference is more pronounced for LDPE films than EVOH films. The results also show the presence of tocopherol can accelerate the release of quercetin. Although none of the films produced is acceptable for long-term lipid oxidation inhibition, the study provides encouraging results suggesting that acceptable films may be produced in the future using polymer blend films.
本文研究了通过改变包装聚合物的疏水性来控制两种抗氧化剂（生育酚和槲皮素）释放速率的可行性，使其适用于长期抑制食品中的脂质氧化。例如，一种抗氧化剂可以快速释放，提供短期/中期保护，而另一种抗氧化剂可以缓慢释放，提供中期/长期的脂质氧化保护。采用乙烯-乙烯醇共聚物（EVOH）、乙烯-醋酸乙烯共聚物（EVA）、低密度聚乙烯（LDPE）和聚丙烯（PP）等聚合物制备了含有生育酚和槲皮素的控释包装膜；采用紫外可见分光光度法测定了这些抗氧化剂在 95%乙醇（脂肪模拟食品）中的释放情况，并采用适当的初始和边界条件的菲克扩散模型对数据进行拟合。对于仅含有槲皮素的膜，结果表明，对于亲水性聚合物（EVOH 和 EVA），槲皮素的释放速度快得多，但持续时间短得多；对于疏水性聚合物（LDPE 和 PP）则相反。对于含有生育酚和槲皮素的二元抗氧化剂膜，结果表明，在 LDPE 和 EVOH 膜中，生育酚的释放速度比槲皮素快，但持续时间短，LDPE 膜比 EVOH 膜更为明显。结果还表明，生育酚的存在可以加速槲皮素的释放。虽然所制备的膜都不能长期抑制脂质氧化，但研究结果令人鼓舞，表明未来可能采用聚合物共混膜生产出可接受的膜。
