中国农业科学2017，Vol.50Issue(19)：3797-3807,11.DOI:10.3864/j.issn.0578-1752.2017.19.016
纳米抗菌包装对胚芽米储藏过程中陈化的抑制作用
The Inhibition Effect of Nano-Antibacterial Packages on the Aging of Milled Rice with Embryo During Storage
摘要
Abstract
[Objective]Milled rice with embryo is easy to deteriorate and difficult to store, which is always a big problem to hinder the promotion. The study was intended to explore the aging mechanism and metamorphism of milled rice with embryo during preservation. The results would provide some references for developing a new packaging material which caters for both market demand and rice preservation.[Method]Milled rice with embryo of WuYou 4 was used as experimental material. Two different kinds of nano-antimicrobial polyethylene (PE) packaging materials were made for the experiment. It was stored at 25℃ and 65% relative humidity for 28 days. And it used ordinary polyethylene (PE) packaging as a comparison. Both of them were sampled once per 7 days. The effect of the nano-packaging material on the quality of stored milled rice with embryo was studied by tracking the changes in the gas proportion in the packages, total colony number, lipase activity, total amount of fatty acids, gelatinization characteristics, fatty acids composition, the cross-section microscopic structure of milled rice with embryo and studying antibacterial property of common plastic packaging film.[Result] The results indicate that antimicrobial package material played a part in regulating the gas in the package by decreasing the value of O2/CO2, which decreases rice depletion. The data of the bacteriostatic experiment proved that compared with the common packaging materials, the antibacterial effects of two nano-antimicrobial packaging materials are better, whose antibacterial percent toEscherichia coli and rice mold are higher than 99% and 95%. The number of colony preserved in PE packages at room temperature for 28 days is 410000 cfu/g, while the numbers of those preserved in two kinds of nano-packages in the same condition are just around 170000 cfu/g and 180000 cfu/g and the results indicate significant differences (P<0.05). The decrease of the number of molds in antimicrobial packages reduced the lipase activity and prevented the fatty acids from accumulation. Milled rice with embryo is suitable for human body for its rational acid contents. The initial fatty acid composition consists of 71.22% unsaturated fatty acids. After 28 days of preservation, the fatty acid composition of rice stored in PE packages consists of 65.95% unsaturated fatty acids, while those stored in two kinds of nano-packages in the same condition are closer to the initial data and just around 69.10% and 67.41%. The nano-packages also show special quality in keeping gelatinization characteristics, which affect the taste. As is shown in the microstructure of endosperm section, to some extent, the nano-packaging material makes a difference in delaying the aging of milled rice with embryo.[Conclusion]Milled rice with embryo is easy to aging at room temperature. The growth of the mold, the breakdown of fat and the change of structure show the aging process. The nano-packaging material retards the aging and keeps gelatinization characteristics of rice by stopping the mold from breeding and changing the gas composition.关键词
胚芽米/储藏/陈化/纳米抗菌包装材料/抑菌作用Key words
milled rice with embryo/storage/aging/nano-antimicrobial packaging material/bacteriostatic effect引用本文复制引用
谢骏琦,李莉,时优,沈婷,陈宇洁,洪阳,曹崇江..纳米抗菌包装对胚芽米储藏过程中陈化的抑制作用[J].中国农业科学,2017,50(19):3797-3807,11.基金项目
国家自然科学基金(31571901)、江苏省重点研发计划(BE2016386)、江苏省农业科技自主创新资金(CX(16)1054)、南京财经大学大学生创新创业训练计划(201610327005Z) （31571901）
