介孔分子筛搭载槲皮素食品抗氧化活性包装膜制备及其性能研究

以十六烷基三甲基溴化铵(CTAB)和聚(乙二醇)-block-聚(丙二醇)-block-聚(乙二醇)Mn~2900(P131345)作为双模板剂制备出纳米二氧化硅介孔分子筛MCM-41(Mobil Composition of Matter No.41),并进一步以此为载体搭载天然抗氧化剂槲皮素,以低密度聚乙烯(LDPE)为基材制备了一种食品抗氧化活性包装膜。结果表明,所制备纳米二氧化硅介孔分子筛MCM-41比表面积为439.173 m2/g,孔体积为0.665 cm3 g-1,孔径分布为2.4、4.0 nm。吸附槲皮素后,其1,1-二苯基-2-三硝基苯肼(DPPH)自由基在经过24 h和1200 h后平均清除率分别为56.75%和66.01%。同时,槲皮素在食品模拟物中的扩散速率D(cm2/s)由2.127×10-13下降到3.089×10-14。表明以介孔分子筛为载体制备的食品抗氧化活性包装膜具备抗氧化的作用并具备缓释性。

Preparation and characterization of food antioxidaant active packaging films containing Quercetin loaded with mesoporous molecular sieve

MCM-41(Mobil Composition of Matter No. 41)nanosilica mesoporous molecular sieves were prepared with cetyl trimethyl ammonium bromide(CTAB)and poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol)Mn~2900(P131345)as a dual template,and further using MCM-41 as a carrier with natural quercetin antioxidant,low density polyethylene(LDPE)as a substrate to prepare a food anti-oxidation active packaging films.The product had a specific surface area of 439.173 m2/g,a pore volume of 0.665 cm3 g-1,and a pore size distribution of 2.4 and 4.0 nm. After the quercetin was adsorbed,the average clearance rates of DPPH free radical at 24 and 1200 h were 56.75% and 66.01%. The diffusion rate of quercetin in the food simulants in active films prepared by quercetin adsorbed on mesoporous molecular sieve was lower than that of active quercetin films,decreased from 2.127×10-13 to 3.089×10-14. It showed that the anti-oxidation activity of food packaging prepared by using mesoporous molecular sieve as carrier would has anti-oxidant effect and sustained release.