电子束辐照改性制备高溶解度淀粉膜的研究
首发时间:2018-02-20
摘要:以淀粉为基材的可降解材料能够缓解传统塑料制品对环境的压力,具有很大的发展潜力,但是淀粉基材料在应用性能上仍有缺陷。本研究采用不同剂量的电子束辐照作用于蜡质玉米淀粉并以流延法制备淀粉膜。结果表明,随着辐照剂量的升高(2~30KGy),淀粉颗粒表面出现小孔,并且表面损伤程度加深;淀粉分子量发生数量级的下降,Mw从1.0E+08下降至2.3 E+05,Mn从6.8 E+07下降至1.0 E+06,但淀粉的侧链分布变化不大,说明辐照作用显著破坏α-1,6糖苷键;淀粉的糊化温度、焓值和相对结晶度下降。淀粉膜色度随着剂量增加而黄度增强,超过15kGy的淀粉膜呈微黄色;机械性能随着辐照剂量升高呈先升高后降低趋势,10kGy时拉伸强度最佳,较未改性淀粉膜提高29%;溶解度在20kGy 达到最高85.56%,较未改性淀粉膜提高185%。同时,辐照淀粉膜具有良好的阻隔性,可作为良好的食品包装。
For information in English, please click here
Preparation of high solubility starch film using electron beam irradiation modification
Abstract:The development and application of starch based degradable materials can alleviate the pressure of traditional plastics products to the environment, which has great potential of development. However, starch based materials still have defects in their application performance. In this study, different doses of electron beam irradiation were applied on starch and the modified starch based edible films were prepared by casting. The results showed that, small holes appeared on the surface of starch granules after irradiation, and with the increase of irradiation dose (2kGy-30kGy) the surface damage became more serious. The starch molecular weight magnitude decreased, Mw from 1.0E+08 down to 2.3E+05, Mn from 6.8E+07 down to 1E+06. However, the branch chain distribution didn\'t change much. Electron beam irradiation was more likely to attack the α-1,6 glucosidic bonds of starch. The temperature of gelatinization, the enthalpy of gelatinization and relative crystalline were all decreased. The yellowness of starch film increased with the increase of the dose of irradiation, and when the irradiation dose more than 15kGy, the starch film was slightly yellow by visualization; the mechanical properties of the starch film firstly increased and then decreased with the increase of the irradiation dosage. When the irradiation dose is 10 kGy, the tensile strength reached the max value, increased 29% compared with that of unmodified starch film. When the irradiation dose is 20 kGy, the solubility reached the highest of 85.56%, increased 185% compared with that of unmodified starch film. At the same time, the irradiated starch film has good barrier property and can be used as ideal food package.
Keywords: food science electron beam irradiation waxy maize starch properties of starch film
引用
No.****
同行评议
共计0人参与
勘误表
电子束辐照改性制备高溶解度淀粉膜的研究
评论
全部评论0/1000