洋葱干表皮另有妙用
文章来源:未知 文章作者:enread 发布时间:2011-07-15 05:31 字体: [ ]  进入论坛
(单词翻译:双击或拖选)

More than 500,000 tonnes of onion waste are thrown away in the European Union each year. However, scientists say this could have a use as food ingredients(食品添加剂) . The brown skin and external layers are rich in fibre and flavonoids(黄酮类) , while the discarded bulbs contain sulphurous(含硫磺的) compounds and fructans(果聚糖) . All of these substances are beneficial to health. Production of onion waste has risen over recent years in line with the growing demand for these bulbs. More than 500,000 tonnes of waste are generated in the European Union each year, above all in Spain, Holland and the United Kingdom, where it has become an environmental problem. The waste includes the dry brown skin, the outer layers, roots and stalks(茎秆) , as well as onions that are not big enough to be of commercial use, or onions that are damaged.

"One solution could be to use onion waste as a natural source of ingredients with high functional1 value, because this vegetable is rich in compounds that provide benefits for human health", Vanesa Benítez, a researcher at the Department of Agricultural Chemistry at the Autonomous2 University of Madrid (Spain), tells SINC.

Benítez's research group worked with scientists from Cranfield University (United Kingdom) to carry out laboratory experiments to identify the substances and possible uses of each part of the onion. The results have been published in the journal Plant Foods for Human Nutrition.

According to the study, the brown skin could be used as a functional ingredient high in dietary fibre (principally the non-soluble type) and phenolic(酚醛树脂) compounds, such as quercetin(槲皮黄酮) and other flavonoids (plant metabolites with medicinal properties). The two outer fleshy layers of the onion also contain fibre and flavonoids.

"Eating fibre reduces the risk of suffering from cardiovascular disease, gastrointestinal(胃肠的) complaints, colon3 cancer, type-2 diabetes4 and obesity5", the researcher points out.

Phenolic compounds, meanwhile, help to prevent coronary disease and have anti-carcinogenic properties. The high levels of these compounds in the dry skin and the outer layers of the bulbs also give them high antioxidant(抗氧化剂) capacity.

Meanwhile, the researchers suggest using the internal parts and whole onions that are thrown away as a source of fructans and sulphurous compounds. Fructans are prebiotics(益生元) , in other words they have beneficial health effects as they selectively stimulate6 the growth and activity of bacteria in the colon.

Sulphurous compounds reduce the accumulation of platelets(血小板) , improving blood flow and cardiovascular health in general. They also have a positive effect on antioxidant and anti-inflammatory systems in mammals.

"The results show that it would be useful to separate the different parts of onions produced during the industrial process", explains Benítez. "This would enable them to be used as a source of functional compounds to be added to other foodstuffs7(食品,粮食) ".



点击收听单词发音收听单词发音  

1 functional 5hMxa     
adj.为实用而设计的,具备功能的,起作用的
参考例句:
  • The telephone was out of order,but is functional now.电话刚才坏了,但现在可以用了。
  • The furniture is not fancy,just functional.这些家具不是摆着好看的,只是为了实用。
2 autonomous DPyyv     
adj.自治的;独立的
参考例句:
  • They proudly declared themselves part of a new autonomous province.他们自豪地宣布成为新自治省的一部分。
  • This is a matter that comes within the jurisdiction of the autonomous region.这件事是属于自治区权限以内的事务。
3 colon jqfzJ     
n.冒号,结肠,直肠
参考例句:
  • Here,too,the colon must be followed by a dash.这里也是一样,应当在冒号后加破折号。
  • The colon is the locus of a large concentration of bacteria.结肠是大浓度的细菌所在地。
4 diabetes uPnzu     
n.糖尿病
参考例句:
  • In case of diabetes, physicians advise against the use of sugar.对于糖尿病患者,医生告诫他们不要吃糖。
  • Diabetes is caused by a fault in the insulin production of the body.糖尿病是由体內胰岛素分泌失调引起的。
5 obesity Dv1ya     
n.肥胖,肥大
参考例句:
  • One effect of overeating may be obesity.吃得过多能导致肥胖。
  • Sugar and fat can more easily lead to obesity than some other foods.糖和脂肪比其他食物更容易导致肥胖。
6 stimulate wuSwL     
vt.刺激,使兴奋;激励,使…振奋
参考例句:
  • Your encouragement will stimulate me to further efforts.你的鼓励会激发我进一步努力。
  • Success will stimulate the people for fresh efforts.成功能鼓舞人们去作新的努力。
7 foodstuffs 574623767492eb55a85c5be0d7d719e7     
食物,食品( foodstuff的名词复数 )
参考例句:
  • Imports of foodstuffs accounted for a small proportion of total imports. 食物进口仅占总进口额的一小部份。
  • Many basic foodstuffs, such as bread and milk, are tax-free. 许多基本食物如牛奶和面包是免税的。
TAG标签: skin food onion
发表评论
请自觉遵守互联网相关的政策法规,严禁发布色情、暴力、反动的言论。
评价:
表情:
验证码:点击我更换图片