Development Of New Slow-release Antioxidant Food Packaging Film

In order to guarantee the quality of fatty foods and extend their shelf life, antioxidantpackaging technology has come into being, and has been the general interest in food and foodpackaging industry. Based on the known studies and the principles of slowed-releasedfertilizer technology, the paper developed antioxidant packaging film with slow releaseproperty in which HDPE and EVA act as the substrate of the polymer blend, quercetin as theactive antioxidant, unmodified and modified bentonite, kaolin and diatomite as the slowrelease agent. For the new-developed films, Filler type, filler modification and filler contenton the physical propertied and the release properties of the new-developed films werestudied.The antioxidant real protection effect of the antioxidant was also studied. Whole milkpowder with the antioxidant films as the packaging material under40℃and light weremonitored with the extension of time. The monitor indicators was the oxidativedecomposition product, concluding pentanal, hexanal and heptanal which were determinedand quantified by the Gas Chromatography. The main study content and conclusions are asfollowed:1. Set tensile strength, antioxidants retention and adaptability of detection method as theindicators to determine the most suitable methods for this study. And the results show that tworoll mixing mill for Plastics and HPLC were the best choices for blending and measuringensuring the feasibility of the development of antioxidant slow-released packaging films.2. HDPE/EVA blend films added with quercetin and slow release agent were developed.Tensile strength, oxygen barrier capability and moisture barrier capability and thermalperformance were analysed to reveal the various factors on properties of the antioxidant film.The results show that unmodified filler could weaken the overall performance of theantioxidant films to a certain extent; And when the slow release agent was modified, theproperties of the films could be improved to some extent when the filler content was small.3. The slow-released performance results show that the presence of slow release fillerscould slow the release rate of quercetin from antioxidant packaging films into food simulants;Among the three incorporated inorganic fillers, the release effect of bentonite to quercetin wasthe minimum,having little difference with the blank sample, followed by kaolin and diatomite;For95%ethanol and50%ethanol two food simulants, because of the different solubility ofquercetin in two solutions and the different plasticizing ability of different solvents forresins,the release rate of quercetin into95%ethanol was faster than50%ethanol.4. Determine whole milk powder as active antioxidant object, pentanal, hexanal,heptanal as the measurement indicators to study the actual antioxidant capacity of thisantioxidant films. The results revealed that with the presence of release agents, the quercetinrelease rate was reduced so that quercetin migrated continually into the inner package over alonger time and the appearance of the equilibrium state need more time, thus confirming thevalidity of the slow-released antioxidant packaging films for antioxidant protection.