托福听力课外资料练习：科学美国人60秒猪肠除臭相关内容分享

2017年07月17日17:19 来源：小站整理: 参与（0）阅读（2532）

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科学美国人60秒听力练习：猪肠除臭

科学美国人60秒英文文本

Chemists have isolated an ingredient in coriander leaf, aka cilatro, that neutralizes a particularly fetid aroma associated with cooking chitlins. Cynthia Graber reports

Here’s a strange tale of two previously unrelated food products. First: chitlins, that delicacy made of fried pig intestines. They’re well-loved throughout the South, especially during the upcoming holiday season. But the smell of them cooking inspires significantly less affection. Because the cooking process sometimes smells like, well, feces.

Researchers in Japan thought that cilantro could help. Because cilantro is used in a variety of cuisines around the world to mask smells, as well as to add distinctive flavors. And in a previous study, the research team had shown that cilantro can mask the cooking-chitlin stench.

In the new research, in the Journal of Agricultural and Food Chemistry, they isolated cilantro’s volatile compounds and tested each one for its odor-fighting power. Many seemed to lessen the stink, but one in particular, according to human sniffers, entirely cancels out the odor. [Hiromi Ikeura et al., "Identification of (E,E)-2,4-Undecadienal from Coriander (Coriandrum sativum L.) as a Highly Effective Deodorant Compound against the Offensive Odor of Porcine Large Intestine"]

It’s called (E,E)-2,4-Undecadienal. It works at a very low concentration—10 parts per billion—so you can’t smell the compound. It’s not masking the chitlin odor, it’s actually neutralizing it. So it’s not just better living through chemistry. It’s better chitlins too.