针对现有除氧包装氧气清除效率低、催化剂析出极易造成食品二次污染等问题,本研究利用静电纺丝技术制备了内部结构均一的1,2-PB/Fe(Ⅱ)salen多孔状超细纤维膜(纤维平均直径2.3μm),采用扫描电子显微镜(SEM)、傅里叶变换红外光谱(FT-IR)对样品进行表征,探讨了纺丝液流变特性,深入研究了静电纺丝工艺对纤维形貌调控规律,采用氧气吸收动力学实验评价了纤维膜的除氧效果,并将纤维膜应用于核桃油抗氧化调控,通过定期监测核桃油过氧化值和p-茴香胺值的变化,研究了除氧材料对核桃油氧化稳定性的影响.结果表明,1,2-PB/Fe(Ⅱ)salen超细纤维膜除氧时效为20 d,氧气吸收率高达283 mL O2/g膜,相比于市售铁粉、1,2-PB/Fe(Ⅱ)salen流延膜除氧量分别提高1032％和55.7％,除氧时效分别延长17 d以及5 d.纤维膜可有效抑制核桃油氧化,加速氧化[(63±2)℃储存]第15天比市售铁粉和流延膜处理核桃油的过氧化值分别降低21.74％、14.28％,p-茴香胺值分别降低38.14％、20.52％.
Preparation of 1,2-polybutadiene-based Deoxygenated Functional Microfiber Film and Its Application in Walnut Oil Preservation
Aiming at the problems of low deoxygenation efficiency of the existing deoxygenation package and the precipitation of catalysts very easily causing secondary contamination of foodstuffs,electrospinning technology was used in this study to prepare 1,2-PB/Fe(Ⅱ)salen microfiber films with a homogeneous internal structure (average fiber diameter 2.3 μm).Scanning electron microscope (SEM)and Fourier transform infrared spectroscopy (FT-IR)were used to characterize the samples,and the rheological properties of the spin solutions and the relationship between the spinning process and the fiber morphology were analyzed at the same time.The oxygen absorption ki-netics experiment was used to evaluate the deoxygenation effect of fiber film,the fiber film was applied to the an-tioxidant regulation of walnut oil,and the influence of the deoxidizing material on the oxidative stability of walnut oil was investigated by regularly monitoring the changes in the peroxide value of walnut oil and p-anisidine value.The results indicated that 1,2-PB/Fe(Ⅱ)salen microfiber film deoxygenation limitation was 20 days,and the oxygen absorb rate was as high as 283 mL(O2)/g(film).Compared to commercially available iron powder and 1,2-PB/Fe(Ⅱ)salen cast film,1,2-PB/Fe(Ⅱ)salen microfiber film increased oxygen absorb rate by 1032％ as well as 55.7％,extended the deoxygenation time by 17 days as well as 5 days.Fiber film can effectively inhibit the oxi-dation of walnut oil.The accelerated oxidation of fiber membrane (stored at (63±2 )℃)on the 15 th day reduced the peroxide value of walnut oil by 21.74％ and 14.28％,and the value of p-anisidine by 38.14％ and 20.52％,respectively,compared with that of the commercially available iron powder and the cast film treated wal-nut oil.
万方数据
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