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Bug spray works off a chemical called DEET, which is as essential to a summer evening as the smell of freshly cut grass or the sound of cicadas in the trees. Developed by the U.S. Army in 1944 to protect soldiers from insect-borne diseases such as malaria, DEET is now the silent guardian of backyard barbecues and camping trips, offering an invisible shield against mosquitoes.
But what makes DEET so effective?
And how does this chemical manage to deter insects without harming humans? Today, we will explore the science behind DEET and uncover the fascinating interplay between chemistry and biology that keeps our skin bite-free and our nights under the stars peaceful.
DEET's chemical name is N, N-Diethyl-m-toluamide, and it confuses insects' sensory receptors. When applied to the skin, DEET masks the natural odors emitted by humans, which are typically attractive to mosquitoes and other biting insects. Instead of acting as a repellent that drives insects away, DEET essentially makes it difficult for them to locate us in the first place. The compound interferes with the neurons and receptors in an insect's antennae and mouthparts that detect lactic acid and carbon dioxide, both of which signal the presence of a potential host. This disruption in their sensory mechanisms leaves mosquitoes disoriented and unable to zero in on their next meal, ensuring that you can enjoy your outdoor activities without the constant buzz and bite of these pesky insects.
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References and uses:
Pavia, D. L. (2007). Introduction to organic laboratory techniques: A microscale approach. Thomson Brooks/Cole.
Wikipedia contributors. (2024, June 17). DEET. In Wikipedia, The Free Encyclopedia. Retrieved 00:21, June 27, 2024, from en.wikipedia.org/w/index.php?...
Chapters:
00:00 Introduction
01:06 How it works
01:52 To make some DEET, we need a few chemicals
02:27 Preparation of m-Toluoyl Chloride
07:53 Preparation of N,N-Diethyl-m-toluamide
09:20 Purification
11:10 Analysis
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