叶绿素铁钠盐的制备及稳定性研究

The preparation of sodium iron chlorophyll and stability research

以从蚕砂中提取的叶绿素为原料,经皂化、酸化、铁代及加碱成盐等过程制备叶绿素铁钠盐,用紫外-分光光度法检测其质量。并测定了其对光、热、金属离子和几种食品添加剂的稳定性。结果表明:叶绿素铁钠盐对光的稳定性较差,在低于80℃时很稳定。对大部分的金属离子稳定,但Sn4+、Fe3+对其稳定性影响较大;叶绿素铁钠的抗氧化能力较差,但抗还原能力好。几种食品添加剂对其影响不大。

Two kinds of GNPs/PP thermally conductive composites were prepared with KNG180 GNPs or KNG150 GNPs via melt blending, and their thermal conductivity, density, crystallization behavior and thermal stability were investigated. The results show that the density of KNG180 GNPs/PP composite is higher than that of KNG150 GNPs/PP, and the crystallization degree improvement of PP is higher when filled with KNG180 than KNG150. The thermal conductivity of composites was dramatically improved along with the increase of GNPs content, and the improvement of KNG180 GNPs/PP is much higher than KNG150 GPNs/PP. The composites contained 60% mass fraction of KNG180 has a thermal conductivity of 1.32 W/（m·K） which was more than 14 times as that of the pure PP（0.087 W/（m·K））. As the GNPs incorporated, thermal stability of the GNPs/PP composites is enhanced. When the mass fraction of KNG180 and KNG150 was 10%, the maximum mass loss rate temperature is increased from 345.1 ℃ to 374.6 ℃ and 397.9 ℃, respectively. But when the contents of KNG180 or KNG150 reach to a certain content, the thermal stability begins to decrease.