24小时热门版块排行榜    

查看: 1967  |  回复: 13
当前只显示满足指定条件的回帖,点击这里查看本话题的所有回帖

冰雪灵魂

木虫 (著名写手)

食品科学家族族长

[交流] 【转帖】外电报道:中国科学家发明检测三聚氰胺的快捷新方法 已有13人参与

据美国食品安全新闻网8月10日消息称,由中国卫生部资助的科研小组于本周在同行评审期刊《Talanta》杂志上宣布:他们已发明了一种用以检测牛乳制品中三聚氰胺的快速简单变色的测试方法。




    在2008年爆发估计有30万患儿及6例死亡病例的三聚氰胺奶粉丑闻后,该科研组开始研发测试方法。

    在文章中,研究者称:他们开发出一种比色检测方法,利用黄金纳米粒子检测产品是否被三聚氰胺污染。当被检测的产品中存在三聚氰胺时,则纳米粒子会互相接近并且聚集,而它们的颜色也从酒红色变为紫色或蓝色。这种方法对液体牛奶的检出限为1.0ppm。对婴儿幼儿配方奶粉的检出限为4.2ppm。在使用紫外-可见分光光度法后,灵敏度提高,液体奶的检出限为0.15ppm,婴儿幼儿配方奶粉的检出限为2.5ppm。这种测试可在30分钟内完成,并且不需要预处理。所以研究者们称这种方法适合对掺有三聚氰胺的乳制品进行现场检验。

    这种新的测试方法与现有的方法相比,具有更加快速且成本更低的优点,并且不需要先进的一起或者固相检查,但是其相对于其他测试方法来说,灵敏度相对要低一些。

    虽然其灵敏度较低,但是研究者称,这种检测方法的灵敏度已足够监管部门对乳制品中三聚氰胺水平的检测了。

    据悉,在欧洲和美国,三聚氰胺的安全限制目前是2.5mg kg-1,而在中国,婴儿配方食品为1mg kg-1,其他乳制品是2.5mg kg-1。

    原文报道:

New Test Detects Melamine in Milk Products

by Michelle Greenhalgh | Aug 10, 2010
This week Chinese scientists funded by the Chinese Ministry of Health announced in the peer-reviewed Talanta journal that they have developed a quick and simple color change test to detect melamine in milk products.

Scientists began working on developing a test after the contaminated milk scandal in 2008, when milk powder tainted with melamine sickened an estimated 300,000 people and killed six children.

In the article, scientists explained that they developed a colorimetric testing method that uses gold nanoparticles to determine whether or not the product is tainted. The test is designed so that when the nanoparticles approach each other and aggregate, their color changes from wine red to purple or blue. When melamine is present in the tested product, the aggregate approach process commences.

The new test can be used to test for melamine in infant formula and liquid milk with a detection limit of 1.0 ppm for liquid milk and 4.2 ppm for formula. The use of UV-vis-spectroscopy improves the sensitivity to 0.15 ppm in liauid milk and 2.5 ppm in infant formula.

The test can be completed within 30 minutes and does not require pretreatment. Study authors said, "The proposed method is promising for on-site screening of melamine adulterant in milk products."

The new testing method is praised by the scientists as faster, less costly than existing methods, and does not require advanced instruments or solid phase examination, but it is less sensitive than other tests.

Despite sensitivity issues, scientists claim that the test is sufficiently sensitive to detect melamine in milk-based products at levels desired by regulatory bodies.

In Europe and the US, melamine safety limits are 2.5mg kg-1 while the limit in China is 1mg kg-1 for infant formula and 2.5mg kg-1 for other dairy products.

原文地址:http://www.foodsafetynews.com/20 ... e-in-milk-products/

[ Last edited by lovibond on 2011-11-27 at 19:52 ]
回复此楼
要想得到常人所不能得到的,就懂得付出常人所不能付出的!
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

baicai109

木虫 (正式写手)


小木虫(金币+0.5):给个红包,谢谢回帖交流
说实话这个用处不大,金标法,最后还是要用LCMS来最后定性定量,同意上面的,是玩票性质,用于初步筛选
13楼2010-12-14 19:40:15
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 14 个回答

zhangjingfei01

木虫 (正式写手)


小木虫(金币+0.5):给个红包,谢谢回帖交流
哪个实验室的啊?
4楼2010-08-17 10:51:08
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

richujs

木虫 (正式写手)


小木虫(金币+0.5):给个红包,谢谢回帖交流
Southwest University?
是不是发表在Chem. Commun., 2010 ,First published on the web 11th June 2010 的这篇:Visual and light scattering spectrometric detections of melamine with polythymine-stabilized gold nanoparticles through specific triple hydrogen-bonding recognition
思想是能力和力量的源泉
5楼2010-08-17 18:05:54
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

tigerdwan

木虫 (正式写手)

圆月弯刀

水平越来越高了~~~
不进则退,不喜则忧,不得则亡,此世人之常。
6楼2010-08-18 09:15:53
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
普通表情 高级回复 (可上传附件)
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 售SCI一区T0P文章,我:8.O.55.1.O.5.4,科目全,可+急 +3 7K1CJE38xLG4 2026-08-25 4/200 2026-08-26 02:04 by cNXvBfCpiZOM
[论文投稿] 售SCI一区T0P文章,我:8O.55.1.O.5.4,科目齐全,可+急 +3 7K1CJE38xLG4 2026-08-25 4/200 2026-08-26 02:04 by cNXvBfCpiZOM
[基金申请] 今天务委会开完了,明天出结果吗 +18 angus9576 2026-08-25 22/1100 2026-08-26 00:41 by merchancy
[基金申请] 在坚冰还盖着北海的时候,我看到了怒放的梅花。 (金币+10) +6 ziyangfang 2026-08-25 9/450 2026-08-25 20:26 by huagongfeihu
[基金申请] 明天应该可查了!? +6 chengyan1220 2026-08-23 6/300 2026-08-25 19:45 by zfd97
[基金申请] 有没有大神帮我看看基金代码 28+4 1234567wang 2026-08-24 10/500 2026-08-25 19:15 by lfy8008
[基金申请] 放榜前的不淡定 20+4 snowwithsea 2026-08-19 19/950 2026-08-25 17:57 by chick875
[基金申请] 如果此刻你正在为国基感到焦虑,不妨来听听这首《基金之外》 +8 scalable 2026-08-24 8/400 2026-08-25 12:52 by jnhyjjm
[基金申请] 没有任何消息-是不是就凉了 +9 图啦图啦 2026-08-24 10/500 2026-08-25 11:59 by 南海小哥
[基金申请] 人气不行了 +11 fansofjerry 2026-08-21 11/550 2026-08-25 11:04 by 孤独的英雄6
[教师之家] 导师吐槽:我怎么摊上了这么个极品研究生! +3 苏东坡二世 2026-08-23 3/150 2026-08-25 10:35 by shisan1313
[基金申请] 2026年的国家社科基金项目通讯评审的新规则与新动向、新挑战 +5 process2012 2026-08-23 7/350 2026-08-25 09:42 by huixian257
[基金申请] 范进中举一文的中心思想 +7 炎黄贵胄 2026-08-22 8/400 2026-08-25 08:48 by ZJTJZ
[基金申请] filecode,4个jtjc了 +14 ziyangfang 2026-08-19 17/850 2026-08-24 18:37 by 哈哈蛤?
[基金申请] 建议基金发布提前给出明确的时间点 +13 kulium 2026-08-21 16/800 2026-08-24 16:27 by superceng
[教师之家] 跳槽后在研项目怎么办? +5 简单化xn 2026-08-22 10/500 2026-08-23 12:38 by 简单化xn
[基金申请] 看来今天不会放榜了? +8 chengyan1220 2026-08-21 11/550 2026-08-21 17:52 by dcqxinyang
[基金申请] 时间戳又变了 +13 wuchongjun 2026-08-20 19/950 2026-08-21 17:21 by 紫杉醇
[基金申请] 今天放榜没戏了吧 +9 yuleib84 2026-08-19 11/550 2026-08-21 10:06 by gltch
[基金申请] 基金啊基金 +4 longfie172 2026-08-20 4/200 2026-08-21 08:58 by mark mao
信息提示
请填处理意见