环境无害包装能延长食品的保质期

时间：2016-02-26 05:02:16

（单词翻译:单击）

Researchers from the National University of Singapore (NUS) have successfully developed an environmentally-friendly food packaging material that is free from chemical additives1, by fortifying2 natural chitosan-based composite film with grapefruit seed extract (GFSE). This novel food packaging material can slow down fungal growth, doubling the shelf-life of perishable3 food, such as bread. Chitosan, a natural and biodegradable polymer derived4 from the shells of shrimp5 and other crustaceans6, has immense potential for applications in food technology, owing to its biocompatibility, non-toxicity, short time biodegradability and excellent film forming ability. Chitosan also has inherent antimicrobial and antifungal properties. GFSE, on the other hand, is antioxidant and possesses strong antiseptic, germicidal, anti-bacterial, fungicidal and anti-viral properties.
 
Associate Professor Thian Eng San and PhD student Ms Tan Yi Min from the Department of Mechanical Engineering at NUS Faculty8 of Engineering spent three years perfecting the formulation to create a novel composite film that not only prevents the growth of fungi7 and bacteria, but has mechanical strength and flexibility9 that are comparable to synthetic10 polyethylene film commonly used for food packaging. The composite film also effectively blocks ultraviolet light, hence slowing down the degradation11 of food products as a result of oxidation and photochemical deterioration12 reactions. 
 
Laboratory experiments showed that the shelf-life of bread samples packaged with chitosan-based GFSE composite films was two times longer than those packaged using synthetic packaging films. 
 
"Increasing attention has been placed on the development of food packaging material with antimicrobial and antifungal properties, in order to improve food safety, extend shelf-life and to minimise the use of chemical preservatives13. Consumers are also demanding that packaging materials be formulated14 from natural materials that are environmentally friendly and biodegradable while improving food preservation15. This novel food packaging material that we have developed has the potential to be a useful material in food technology," said Assoc Prof Thian.

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1 additives cf3f12a049807f79b9faf1553e074059     
n.添加剂( additive的名词复数 )
参考例句：
  • chemical additives in petrol 汽油中的化学添加剂
  • It'says on the packet that these crisps contain no additives. 包装上说这些炸薯片不含添加剂。 来自《简明英汉词典》
2 fortifying 74f03092477ce02d5a404c4756ead70e     
筑防御工事于( fortify的现在分词 )； 筑堡于； 增强； 强化（食品）
参考例句：
  • Fortifying executive function and restraining impulsivity are possible with active interventions. 积极干预可能有助加强执行功能和抑制冲动性。
  • Vingo stopped looking, tightening his face, fortifying himself against still another disappointment. 文戈不再张望，他绷紧脸，仿佛正在鼓足勇气准备迎接另一次失望似的。
3 perishable 9uKyk     
adj.（尤指食物）易腐的，易坏的
参考例句：
  • Many fresh foods are highly perishable.许多新鲜食物都极易腐败。
  • Fruits are perishable in transit.水果在运送时容易腐烂。
4 derived 6cddb7353e699051a384686b6b3ff1e2     
vi.起源；由来；衍生；导出v.得到( derive的过去式和过去分词 )；（从…中）得到获得；源于；（从…中）提取
参考例句：
  • Many English words are derived from Latin and Greek. 英语很多词源出于拉丁文和希腊文。 来自《简明英汉词典》
  • He derived his enthusiasm for literature from his father. 他对文学的爱好是受他父亲的影响。 来自《简明英汉词典》
5 shrimp krFyz     
n.虾，小虾；矮小的人
参考例句：
  • When the shrimp farm is built it will block the stream.一旦养虾场建起来，将会截断这条河流。
  • When it comes to seafood,I like shrimp the best.说到海鲜，我最喜欢虾。
6 crustaceans 37ad1a9eb8e9867969edd084ce8032d5     
n.甲壳纲动物（如蟹、龙虾）( crustacean的名词复数 )
参考例句：
  • These crustaceans provide a valuable food source for some fish. 这些甲壳纲动物是某些鱼类重要的食物来源。 来自《简明英汉词典》
  • When the tide ebbs it's a rock pool inhabited by crustaceans. 退潮时，它便成为甲壳动物居住的岩石区潮水潭。 来自辞典例句
7 fungi 6hRx6     
n.真菌，霉菌
参考例句：
  • Students practice to apply the study of genetics to multicellular plants and fungi.学生们练习把基因学应用到多细胞植物和真菌中。
  • The lawn was covered with fungi.草地上到处都是蘑菇。
8 faculty HhkzK     
n.才能；学院，系；(学院或系的)全体教学人员
参考例句：
  • He has a great faculty for learning foreign languages.他有学习外语的天赋。
  • He has the faculty of saying the right thing at the right time.他有在恰当的时候说恰当的话的才智。
9 flexibility vjPxb     
n.柔韧性，弹性，（光的）折射性，灵活性
参考例句：
  • Her great strength lies in her flexibility.她的优势在于她灵活变通。
  • The flexibility of a man's muscles will lessen as he becomes old.人老了肌肉的柔韧性将降低。
10 synthetic zHtzY     
adj.合成的，人工的；综合的；n.人工制品
参考例句：
  • We felt the salesman's synthetic friendliness.我们感觉到那位销售员的虚情假意。
  • It's a synthetic diamond.这是人造钻石。
11 degradation QxKxL     
n.降级；低落；退化；陵削；降解；衰变
参考例句：
  • There are serious problems of land degradation in some arid zones.在一些干旱地带存在严重的土地退化问题。
  • Gambling is always coupled with degradation.赌博总是与堕落相联系。
12 deterioration yvvxj     
n.退化；恶化；变坏
参考例句：
  • Mental and physical deterioration both occur naturally with age. 随着年龄的增长，心智和体力自然衰退。
  • The car's bodywork was already showing signs of deterioration. 这辆车的车身已经显示出了劣化迹象。
13 preservatives fab08b2f7b02c895323967c3d2849c5c     
n.防腐剂( preservative的名词复数 )
参考例句：
  • The juice contains no artificial preservatives. 这种果汁不含人工防腐剂。
  • Meat spoils more quickly without preservatives. 不加防腐剂，肉会坏得快。 来自《现代英汉综合大词典》
14 formulated cfc86c2c7185ae3f93c4d8a44e3cea3c     
v.构想出( formulate的过去式和过去分词 )；规划；确切地阐述；用公式表示
参考例句：
  • He claims that the writer never consciously formulated his own theoretical position. 他声称该作家从未有意识地阐明他自己的理论见解。 来自《简明英汉词典》
  • This idea can be formulated in two different ways. 这个意思可以有两种说法。 来自《现代汉英综合大词典》
15 preservation glnzYU     
n.保护，维护，保存，保留，保持
参考例句：
  • The police are responsible for the preservation of law and order.警察负责维持法律与秩序。
  • The picture is in an excellent state of preservation.这幅画保存得极为完好。

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