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This is Scientific American ― 60-Second Science. I'm Karen Hopkin.
Need a quick breath check before your big meeting...or your big date?
Well, scientists from South Korea may be able to help.
They've engineered a portable device that detects even the tiniest trace of hydrogen sulfide...
the stuff that smells like rotten eggs that is one of the primary offenders in oral obnoxiousness.
Their work appears in the journal Analytical Chemistry.
Bad breath, a.k.a. halitosis, can be more than a social inconvenience.
A skunky mouth also may point to some serious underlying medical or dental issues.
"Early diagnosis is very significant to prolong your healthy life."
Jun-Hwe Cha of the Korea Advanced Institute of Science and Technology.
He says that most of the instruments used for diagnostics are found in clinics or hospitals...
which may be tough to get to.
And the electronic sensors that are currently used to sniff out various gases require a power source and precise calibration...
not easy when you're out and about.
"So, we came up with a strategy to develop colorimetric gas sensors, which change its color when detecting biomarker gases."
Think of it as a litmus test for your exhalation.
To build their sensor, the researchers took lead acetate...
a chemical used in some hair dye products that turns brown when exposed to hydrogen sulfide.
And they embedded it in a three-dimensional nanofiber web...so the dye would spread out across a large surface area.
That distribution gives the sensor the sensitivity it needs to detect trace amounts of H2S.
这里是科学美国人――60秒科学。我是凯伦・霍普金。
在重要会议或重要约会之前,你需要快速检查一下口腔味道吧?
那韩国的几位科学家可能会帮到你。
他们设计了一种便携式设备,这个设备甚至可以检测到最微量的硫化氢,
这种有臭鸡蛋味道的物质是口腔异味的主要来源之一。
他们的研究结果发表在《分析化学》期刊上。
口腔异味即口臭,可能不仅仅是社交不便那么简单。
有异味的口腔也可能表明存在严重的潜在内科或牙科问题。
“早期诊断对延长健康生活非常重要。”
韩国先进科技学院的Jun-Hwe Cha说到。
他表示,大多数用来诊断的仪器都在诊所或医院,
让人们跑这些地方可能很辛苦。
而目前用于嗅探各种气体的电子传感器需要电源和精确的校准,
这在外出时不易实现。
“所以,我们想出了一种策略,研发比色法气体传感器,当检测到生物标志气体时,传感器就会改变颜色。”
把它想成检测呼气的石蕊测试。
研究人员采用醋酸铅制造传感器,
醋酸铅是一些染发产品使用的化学物质,它接触硫化氢时会变成棕色。
他们将醋酸铅嵌入三维纳米纤维网中,这样一来染料就会扩散至大表面上。
这种分布方式让传感器拥有了检测微量硫化氢所需的灵敏度。
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