【Gaofenzi.org塑料短讯】立陶宛考纳斯科技大学（KUT）的Paulius Pavelas Danilovas研究团队开发出一种基于植物纤维素的生物可降解食品包装塑料袋材料，与普通的塑料袋相比较，这种新包装材料不仅可完全生物降解，而且具有更长的保鲜时间，研究人员通过筛选最终选定香精油作为抗氧化剂加入材料中，可以延长食品的保鲜时间，另外通过添加纳米银离子颗粒材料使包装材料具备抗菌性能，而且，有意思的是研究发现加入银颗粒后，提高了这种纤维素包装材料的弹性和强度。据研究人员介绍，这种保鲜塑料袋在被被丢弃后可生物降解，完全分解的时间不超过两年。研究团队目前已经制备出该材料保鲜袋的样品，正在研究如何使这项技术实现商业化。根据高分子网（Gaofenzi.org）的报道，此前有其他科研团队使用壳聚糖和牛奶等材料制造保鲜塑料袋，有兴趣的朋友请在本站搜索阅读。
Biodegradable Packages Will Keep Your Food Fresh
KTU researchers are creating biodegradable food packaging materials, which, in addition, will also keep food fresh for longer. This innovation would solve two problems at once: assist in cutting down packaging waste and in reducing the number of food-borne illnesses.
On average a European country citizen produces around 160 kilos of packaging waste; around 19 percent of which is plastic.
“Food packaging is mainly made from various plastics, which are being produced from non-renewable sources and are non-biodegradable. Also, it is not always possible to recycle them as leftovers from food amount to almost 50 percent of the packaging waste”, says Paulius Pavelas Danilovas, researcher at Kaunas University of Technology (KTU) Department of Polymer Chemistry and Technology.
He recommends to change the attitude towards the food packaging, and to choose such packaging material, which would never become waste, but by naturally degrading could turn into fertiliser.
Headed by Danilovas, the team of researchers at the KTU Department of Polymer Chemistry and Technology are working on developing a technological solution for such a package – they investigate the possibility to create it from cellulose composites.
Also, by enriching the packaging material with active components, it can help maintain freshness of food for longer.
Ethereal Oil Increases Food Shelf Life
According to World Health Organisation, more than 350 thousand of people die from food borne illnesses every year. 52 thousand of deaths are caused by salmonella, 37 thousand – by e. coli bacteria. 40 percent of food poisoning cases are children younger than 5 years old.
“Our goal was to create a biodegradable package, which could help to keep food fresh for longer, which could have anti-oxidizing or antimicrobial properties”, says Danilovas. Vesta Navikaitė-Snipaitienė, chemical engineering PhD student at KTU and one of the research team members was responsible for testing the efficiency of various ethereal oils when added to the cellulose-based film.
“Active components of clove ethereal oil are very effective in tying free radicals; this oil proved efficient in enriching packaging with anti-oxidizing qualities. This effect helps to keep food fresh for longer, but such a package is not antimicrobial”, says the researcher.
Silver Renders Antimicrobial Effect
“To achieve antimicrobial effect, we added ionic silver particles to the cellulose based packaging. The results we achieved were quite unexpected – the silver particles made the packaging film more elastic and stronger”, says Danilovas.
The film which is enriched with silver inhibits the growth of microorganisms and its antimicrobial properties remain active for long.
According to Danilovas, it is a great challenge to develop food packaging as for this thermal methods are always being used and cellulose does not have thermoplastic properties.
“We are excited to have found composites, which not only allow cellulose to turn into fluid condition, but also are not toxic, which is very important in all products related to food handling”, says KTU researcher.
The modified cellulose packaging degrades in nature in around two years. The production of the packaging prototype was practically tested in a Lithuanian enterprise.
The commercialisation of biodegradable active food packaging products, which could replace the non-recyclable plastics is in near future plans of the researchers.