Record Information
Creation Date2006-08-16 13:16:24 UTC
Update Date2013-05-29 19:31:11 UTC
Secondary Accession NumbersNone
Metabolite Identification
Common NameRubidium
DescriptionRubidium is a soft, silvery-white metallic element of the alkali metal group, present in traces amounts in human tissues and fluids. Rb-87, a naturally occurring isotope, is (slightly) radioactive. Rubidium is very soft and highly reactive, with properties similar to other elements in group 1, like rapid oxidation in air. Rubidium, particularly 87Rb, in the form of vapor, is one of the most commonly-used atomic species employed for laser cooling and Bose-Einstein condensation. Its desirable features for this application include the ready availability of inexpensive diode laser light at the relevant wavelength, and the moderate temperatures required to obtain substantial vapor pressures. Physiologically, it exists as an ion in the body. It has been found slightly increased in neoplastic human breast tissues obtained from patients at the time of mastectomy, compared to normal tissue. (PMID: 6488192 , 15820728 , 7324778 , 9630429 , 577330 ).
  1. Rubidium [UN1423]
  2. Rubidium +
Chemical FormulaRb
Average Molecular Weight85.4678
Monoisotopic Molecular Weight84.911789341
IUPAC Namerubidium(1+) ion
Traditional IUPAC Namerubidium(1+)
CAS Registry Number7440-17-7
InChI Identifier
Chemical Taxonomy
Super ClassInorganic compounds
ClassInorganic Ions and Gases
Sub ClassMetals
Other DescriptorsNone
Direct ParentNot Available
StatusDetected and Quantified
  • Food
  • Osmolyte, enzyme cofactor, signalling
ApplicationNot Available
Cellular locationsNot Available
Physical Properties
Experimental Properties
Melting Point39 °CNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
physiological charge1ChemAxon
hydrogen acceptor count0ChemAxon
hydrogen donor count0ChemAxon
polar surface area0ChemAxon
rotatable bond count0ChemAxon
SpectraNot Available
Biological Properties
Cellular LocationsNot Available
Biofluid Locations
  • Blood
  • Cerebrospinal Fluid (CSF)
  • Urine
Tissue LocationNot Available
PathwaysNot Available
Normal Concentrations
BloodExpected but not QuantifiedNot ApplicableNot AvailableNot AvailableCommentNormal
  • Not Applicable
Cerebrospinal Fluid (CSF)Detected and Quantified0.499 +/- 0.097 uMAdult (>18 years old)Not SpecifiedNormal
UrineDetected and Quantified1.354 (0.187-3.673) umol/mmol creatinineAdult (>18 years old)BothCommentNormal
UrineDetected and Quantified1.84 +/- 0.46 umol/mmol creatinineAdult (>18 years old)BothNormal
  • Geigy Scient...
  • West Cadwell...
  • Basel, Switz...
Abnormal Concentrations
Not Available
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDNot Available
DrugBank Metabolite IDNot Available
Phenol Explorer Compound IDNot Available
Phenol Explorer Metabolite IDNot Available
FoodDB IDFDB003783
KNApSAcK IDNot Available
Chemspider ID94865
KEGG Compound IDC17061
BioCyc IDNot Available
BiGG IDNot Available
Wikipedia LinkRubidium
NuGOwiki LinkHMDB01327
Metagene LinkHMDB01327
METLIN IDNot Available
PubChem Compound105153
ChEBI ID49847
Synthesis ReferenceNot Available
Material Safety Data Sheet (MSDS)Not Available
General References
  1. Rizk SL, Sky-Peck HH: Comparison between concentrations of trace elements in normal and neoplastic human breast tissue. Cancer Res. 1984 Nov;44(11):5390-4. Pubmed: 6488192
  2. Barany E, Bergdahl IA, Bratteby LE, Lundh T, Samuelson G, Skerfving S, Oskarsson A: Iron status influences trace element levels in human blood and serum. Environ Res. 2005 Jun;98(2):215-23. Pubmed: 15820728
  3. Meurling S, Plantin LO: The concentrations of trace elements in blood from healthy newborn infants. Acta Chir Scand. 1981;147(6):481-5. Pubmed: 7324778
  4. Cornett CR, Ehmann WD, Wekstein DR, Markesbery WR: Trace elements in Alzheimer's disease pituitary glands. Biol Trace Elem Res. 1998 Apr-May;62(1-2):107-14. Pubmed: 9630429
  5. Hagenfeldt K, Landgren BM, Plantin LO, Diczfalusy E: Trace elements in the human endometrium and decidua. A multielement analysis. Acta Endocrinol (Copenh). 1977 Jun;85(2):406-14. Pubmed: 577330