Some of urea in urine breaks down to ammonia

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    Ammonia
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Discussion Overview

The discussion revolves around the breakdown of urea in urine and its relation to the production of ammonia, particularly focusing on the odors associated with aged urine. Participants explore the chemical processes involved and the contributions of other compounds to the smell.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant recalls a strong odor from aged urine, attributing it to ammonia resulting from urea breakdown.
  • Another participant confirms that ammonia is indeed a product of urea decomposition and notes the distinct smell of old urine.
  • A different participant suggests that the odor may not solely be due to ammonia, proposing that other compounds produced by bacteria could contribute to the overall smell.
  • This participant draws an analogy with coffee aroma, indicating that complex mixtures can create distinct smells that differ from their individual components.

Areas of Agreement / Disagreement

While there is agreement that ammonia is a product of urea breakdown, there is no consensus on the extent to which other compounds contribute to the odor of aged urine. Multiple viewpoints remain regarding the complexity of the smell.

Contextual Notes

Participants express varying levels of expertise, with some relying on personal experience and others on general knowledge. The discussion does not resolve the specific contributions of different compounds to the odor.

Who May Find This Useful

This discussion may be of interest to individuals curious about biochemistry, the chemistry of odors, or the decomposition processes in biological samples.

jackson6612
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I'm not a science student. So, please be simple and straightforward.

I remember once I smelled a sample of urine which had been kept there for some days. It smelled so gross that I was going to puke. Someone said that it was because of ammonia which had resulted from break down of urea. I have never smalled pure ammonia, there I can't confirm it. What is your opinion? Please let me know.
 
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Someone was right - ammonia is a product of urea decomposition, and old urine has a distinct ammonia smell.

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Thanks a lot, Borek.
 
I have no experience you understand, but I would expect that as well as ammonia which smells bad but in a clean sort of way, after all it is used in household cleaning materials, there is added bouquet produced by compounds made by the bacteria and stuff that has grown in it. Not necessarily a lot of it. There might be more ammonia, but the aroma could be more due to minor constituents.

Like, according to my memory (I have no knowledge you understand) the major constituents of coffee aroma are acetone and methyl ethyl ketone but coffee does not smell much like them, there is a ripe old mixture of stuff, see e.g. http://www.coffeeresearch.org/science/aromamain.htm
 

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