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crazyboy
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Drinking Heavy Water (D2O)
I recently tasted about 2ml of heavy water and found that it had a slightly sweet taste, I thought this must have been the placebo effect or
contamination because everything I had seen said that it tasted exactly like light water. However, I found a source which claims that it has a sweet
taste which seems too unlikely to be coincidence. Has anyone else experienced this? I don't imagine many people have tasted heavy water, I was simply
curious and wholeheartedly expected it to taste exactly like normal water.
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bfesser
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I'm
curious. Please, share the source. Also, did you spit or swallow?
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crazyboy
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http://articles.mercola.com/sites/articles/archive/2009/01/10/could-drinking-heavy-atoms-lengthen-your-life.aspx
The source isn't exactly reputable nor is the rest of the content in the article particularly legitimate.
Also this old Pop Sci article
http://books.google.com/books?id=eiYDAAAAMBAJ&pg=PA22#v=onepage&q=sweet&f=false
I found numerous references claiming it tastes identical to water only differing in viscosity, but that does not match my experience.
Swallow, couldn't help it 
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bfesser
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I'm sure your enzymes are enjoyed the challenge. Was it semi-heavy (HDO), heavy-oxygen (H<sub>2</sub><sup>17</sup>O or
H<sub>2</sub><sup>18</sup>O), or vanilla (D<sub>2</sub>O)? Thanks for the links.
This fascinates me. Would you mind if I split this out as a new thread?
[Edited on 7/13/13 by bfesser]
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crazyboy
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Quote: Originally posted by bfesser  | I'm sure your enzymes are enjoyed the challenge. Was it semi-heavy (HDO), heavy-oxygen (H<sub>2</sub><sup>17</sup>O or
H<sub>2</sub><sup>18</sup>O), or vanilla (D<sub>2</sub>O)? Thanks for the links.
This fascinates me. Would you mind if I split this out as a new thread?
[Edited on 7/13/13 by bfesser] |
99.9% D2O from Cambridge Isotope Laboratories, Inc.
Go ahead.
Also found this: http://www.sciencemag.org/content/81/2098/273.2.citation but I have no access. Anyone?
[Edited on 13-7-2013 by crazyboy]
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phlogiston
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This sparked my curiosity as well, and I just tasted 0.4 ml of D2O too.
It did taste a little bit sweet to me, but I may have been biased by your report. I took a 0.4 ml distilled water sample immediately after and I am
not convinced I would be able to distinguish between them in a double blind test.
I think part of the problem is that taste perception is much influenced by what you ate/drank just before, appetite, etc.
I know several people that drank 100 ml recently for an experiment and I will ask them if they noticed anything about its taste.
I have recently done an experiment myself for which I had to feed lab mice various concentrations of heavy water (up to 50%). They did drink a little
more than normal, but it is impossibly to say why. Possibly, they like the taste. But they may also feel more thirsty from it or something.
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Endimion17
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If the mice have been on a prolonged diet consisting of up to 50% heavy water intake, they well might be - thirsty.
Heavy water is not something enzymes can cope with. They've evolved a long, long time ago, in a light water environment.
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jock88
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Drinking distilled (very pure) water gives a tasted that is different than tap (or more 'ordinary') water.
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phlogiston
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Yes Jock88, I know and that is exactly why I took distilled water, as I am sure the high purity grade D2O more closely resembles distilled water in
terms of dissolved salts content, etc. than tap water.
Endimion17, in fact the mice that were on >40% D2O were noticeably affected. 1 died before the end of the experiment, and the others failed to gain
weight. The 50% group even lost a little weight, which is usually taken to be a sign of bad health in mice experiments. Some enzymes work normally in
D2O, but some are affected. Especially the ones in which hydrogen bridges play an important role in the catalytic mechanism. One of the first things
that happens when you give mice even relatively low concentrations of D2O is that they become infertile. Fortunately, I already reproduced 
[Edited on 14-7-2013 by phlogiston]
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subsecret
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| Quote: Originally posted by phlogiston | . . . ones in which hydrogen bridges play an important role in the catalytic . . .
[Edited on 14-7-2013 by phlogiston] |
It is said that heavy water may be quite poisonous, due to the fact that it behaves differently during physiological processes. I wonder what the
people who drank 100ml thought about it...
Fear is what you get when caution wasn't enough.
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Endimion17
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| Quote: Originally posted by phlogiston | Endimion17, in fact the mice that were on >40% D2O were noticeably affected. 1 died before the end of the experiment, and the others failed to gain
weight. The 50% group even lost a little weight, which is usually taken to be a sign of bad health in mice experiments. Some enzymes work normally in
D2O, but some are affected. Especially the ones in which hydrogen bridges play an important role in the catalytic mechanism. One of the first things
that happens when you give mice even relatively low concentrations of D2O is that they become infertile. Fortunately, I already reproduced
[Edited on 14-7-2013 by phlogiston] |
How low are we talking about, and how long do they have to be on such diet for the first symptoms to occur?
| Quote: Originally posted by Awesomeness | | It is said that heavy water may be quite poisonous, due to the fact that it behaves differently during physiological processes. I wonder what the
people who drank 100ml thought about it... |
No, it it not quite poisonous. It has been checked, it's not a mistery. You can drink a lot of it and nothing will change. Half a glass of heavy water
is completely harmless for humans. It's when you continue prolonged diet consisting of high concentrations of heavy water that triggers the start of
the symptoms, because the body lacks a suitable reactant for the whole enzyme machinery.
Our metabolism is a huge and complex set of numerous biochemical feedback loops made out of proteins and its basis is catalysis at 37 °C. We're a
biochemical machine that is aware of itself.
I'd really like to drink few glasses of heavy water, but I probably never will because that would be a huge waste of money and I doubt I'll ever be
rich enough to try that.
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bfesser
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I've always wondered if the D<sub>2</sub>O is recovered after such experiments. I've assumed that in the early 1930's this was
mandatory, due to the difficulty and expense in isolating even small quantities. Do you recover all water from the mouse bodies, perspiration, and
urine? It seems like it would make sense to do so, as the starting concentration of heavy water would be much higher than for a regular water feed
stock. If I were to ingest heavy water, I would at least filter and distill the water from my urine afterward.
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phlogiston
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No, it goes to waste, except for the samples of urine, blood and tissues I took for the purpose of the experiment. As chemicals go,
D<sub>2</sub>O is not really very expensive, especially if you don't need 99.99%. For the total cost of an experiment like that, the price
of the D<sub>2</sub>O is insignificant. The experiment consumed 4 liters of 70% D<sub>2</sub>O for about $375 per liter,
whereas we spend a 5 digit figure on the animals and their treatment alone. And then you have to consider the cost of the people doing the experiment,
and the cost of publishing the paper eventually, etc. And even if I would recover some D<sub>2</sub>O, I can't easily use it for further
experiments because I will have to justify in my papers using a strange preparation I purified myself from waste mouse urine rather than some I bought
from a reputed suppplier. It is already difficult enough to do good science, we don't want to make it even harder. Also, we don't have time for that.
It'll cost more to recover the D<sub>2</sub>O than to buy it.
When using radioactive isotopes, the story is different ofcourse. Then everything the mice secrete becomes radioactive waste and has to be collected.
Very messy.
[Edited on 14-7-2013 by phlogiston]
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bfesser
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I just wondered if perhaps the D<sub>2</sub>O enriched fluids were sent back to the company that isolated it to begin with. Thanks for
your response.
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Acidum
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About mice experiment, you said they have been drinking more heavy water than usual, most likely because of organisms inability to use it. Did they
pee more because of the same reason?
...and then I disappeared in the mist...
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phlogiston
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I don't think the reason is that they are unable to use it.
The majority of enzymes/processes work fine in D2O. Some will be just slightly less efficient/fast but that is not usually a big problem to organisms.
I think the most plausible explanations are:
1. It affects the osmoreceptors in the hypothalamus
2. The renal function is affected
3. The mice like the taste of D2O
I don't know if they peed more, but it is likely since mice essentially cannot sweat.
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"If a rocket goes up, who cares where it comes down, that's not my concern said Wernher von Braun" - Tom Lehrer |
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SM2
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AFAIK, most D2O is made in slow breeder types. Drinking a cup WILL RUIN YOUR DIET, as it is heavier than simple H2O, but no, it won't make you glow.
If you had access to a liter of D20, there are lots of fun physical experiments you could perform. Freezing experiments. Ice Cubes of D2O dropping
to the bottom of a glass of water, ect.
"Old men who speak of victory
shed light upon their stolen life
they - drive by night- and act as if they're
moved by unheard music." B. Currie
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seanspotatobusiness
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| Quote: Originally posted by crazyboy | | I recently tasted about 2ml of heavy water and found that it had a slightly sweet taste, I thought this must have been the placebo effect or
contamination because everything I had seen said that it tasted exactly like light water. However, I found a source which claims that it has a sweet
taste which seems too unlikely to be coincidence. Has anyone else experienced this? I don't imagine many people have tasted heavy water, I was simply
curious and wholeheartedly expected it to taste exactly like normal water. |
I can confirm that it has a sweet taste. I drank some low percentage of it for a medical study investigating the effect of diet on gluconeogenesis. It
had a very unpleasant disorienting effect on me and the other subject I was with although the PhD student had told us that it was indistinguishable
from light water.
Thinking about the taste (which was not so unpleasant at the time) makes me feel a little ill but not as ill as I used to feel (this experiment was in
2007/2008).
Rats that are given no choice but to drink heavy water die within 14 days and those that have a choice go for the light water: http://www.ncbi.nlm.nih.gov/pubmed/967900
| Quote: Originally posted by phlogiston | I don't think the reason is that they are unable to use it.
The majority of enzymes/processes work fine in D2O. Some will be just slightly less efficient/fast but that is not usually a big problem to organisms.
|
I must disagree with the suggestion that altering the kinetics of enzymes is not a problem to organisms. Drinking it affected me (as I describe above)
and kills rats if they have no alternative water.
[Edited on 28-8-2015 by seanspotatobusiness]
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blogfast25
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Heavy water effects on animals:
https://en.wikipedia.org/wiki/Heavy_water#Effect_on_animals
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MrHomeScientist
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Did you know you were drinking heavy water at the time? Somehow I suspect these reports of a difference in taste are all psychological. A blind taste
test is needed!
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phlogiston
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| Quote: Originally posted by seanspotatobusiness |
I must disagree with the suggestion that altering the kinetics of enzymes is not a problem to organisms. Drinking it affected me (as I describe above)
and kills rats if they have no alternative water. |
The dizziness you experienced is quite common. The researchers should have warned you about. A colleague says that approximately half of his subjects
that drank 150 ml D2O experienced it. I once drank 200 ml but did not, so it is probably variable between people (I never experienced motion sickness
either and not for lack of trying).
The vast majority of enzymes works fine in D<sub>2</sub>O, although a few enzymes are sensitive to its effects and they may be critical.
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blogfast25
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Fully agree.
I wouldn't rule it out a priori though. For example, recent research found deuterium to suppress the mutation rate of some micro-organisms. Bizarrely,
the effect seems to be caused by quantum tunnelling. Ordinary H atoms in the AC and CT bonds in DNA can tunnel, thus favouring one-base mutations. But
the twice heavier D doesn't tunnel so well.
QM has recently also been found involved in the sense of smell of some animals and the 'compass' of Robins.
So stranger things may yet lie ahead!
[Edited on 28-8-2015 by blogfast25]
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aga
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Strangeness is a given.
Much more to come for sure.
Edit :
Not so.
Robins are unlikley to have much knowledge of QM, so more likely that their behaviour is influenced by Real World phenomena that QM is able to Model
to some measurable degree.
[Edited on 29-8-2015 by aga]
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crazyboy
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| Quote: Originally posted by seanspotatobusiness |
I can confirm that it has a sweet taste. I drank some low percentage of it for a medical study investigating the effect of diet on gluconeogenesis. It
had a very unpleasant disorienting effect on me and the other subject I was with although the PhD student had told us that it was indistinguishable
from light water.
Thinking about the taste (which was not so unpleasant at the time) makes me feel a little ill but not as ill as I used to feel (this experiment was in
2007/2008).
|
Interesting, I'm glad someone has confirmed the sweet taste. The dizziness is interesting, how fast was the onset and how intense was it?
I attached an interesting review of deuterium which notes among other things that high levels of deuterium may reduce damage from gamma radiation and
that deuteratred drugs may resist cytochrome P450 degradation (the authors suggest deuterated insecticides as a possible application).
Attachment: Pharmacological uses and perspectives of heavy water and deuterated compounds.pdf (131kB)
This file has been downloaded 622 times
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careysub
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| Quote: Originally posted by phlogiston |
The dizziness you experienced is quite common. The researchers should have warned you about. A colleague says that approximately half of his subjects
that drank 150 ml D2O experienced it. I once drank 200 ml but did not, so it is probably variable between people (I never experienced motion sickness
either and not for lack of trying). |
Intriguing, too bad heavy water is $90 per 100 mL at United Nuclear (the only source I know of), it would cost $135-180 to duplicate. Not prohibitive
I suppose, but a pricey beverage for sure.
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