608548
Deuterium oxide-18O
50 atom % 18O, 98 atom % D
Synonym(s):
Doubly Labeled Water, Heavy water-d2,18O, Unnormalized water-18O
About This Item
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isotopic purity
50 atom % 18O
98 atom % D
mol wt
20.99 by atom % calculation (50 atom % 18O; 98 atom % D)
bp
101.4 °C (lit.)
mp
3.8 °C (lit.)
density
1.189 g/mL at 25 °C
mass shift
M+4
SMILES string
[2H][18O][2H]
InChI
1S/H2O/h1H2/i1+2/hD2
InChI key
XLYOFNOQVPJJNP-LAPWFLRPSA-N
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Articles
By first labeling molecular oxygen and then body water with 18O in a rat, Lifson measured the 18O abundance in expired CO2 and found the oxygens in CO2 exchanged with the oxygen in water. Indeed, these two oxygen containing species were in rapid isotopic equilibrium due to the actions of what we now know is carbonic anhydrase (Lifson, 1966)
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