Letter | Published:

Electron Spin Resonance Hyperfine Splittings from Zinc and Cadmium in Flavin Radical Chelates

Naturevolume 212pages503504 (1966) | Download Citation



FLAVIN has an appreciable affinity for metal ions at physiological pH values only in its radical (semiquinoid) state. Thus in the presence of some valence stable divalent metal ions (Zn2+, Cd2+) in partially reduced flavin solutions, radical metal ion chelates which have characteristic light and electron spin resonance (ESR) absorptions1–3 are formed. We have therefore studied these chelates in some detail by means of ESR spectroscopy.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1

    Hemmerich, P., DerVartanian, D. V., Veeger, C., and Van Voorst, J. D. W., Biochim. Biophys. Acta, 77, 504 (1963).

  2. 2

    Ehrenberg, A., and Hemmerich, P., Acta Chem. Scand., 18, 1320 (1964).

  3. 3

    Hemmerich, P., Müller, F., and Ehrenberg, A., in King, T. E., Mason, H. S., and Morrison, M., eds., Internat. Symp. on Oxidases, Amherst, 1964, 1, 179 (John Wiley and Sons, New York, 1965).

  4. 4

    Ehrenberg, A., Eriksson, L. E. G., and Müller, F., in Flavins and Flavoproteins, edit. by Slater, E. C., 46 (B. B. A. Library, Vol. 8) (Elsevier, Amsterdam, 1966).

  5. 5

    Müller, F., Ehrenberg, A., and Eriksson, L. E. G., in Ehrenberg, A., Malström, B. G., and Vänngård, T., eds., Magnetic Resonance in Biological Systems (Pergamon Press, London, in the press).

Download references

Author information


  1. Medicinska Nobelinstitutet, Biokemiska avdelningen, Karolinska Institutet, Stockholm, Sweden



  1. Search for ANDERS EHRENBERG in:

  2. Search for L. E. GÖRAN ERIKSSON in:

  3. Search for FRANZ MÜLLER in:

About this article

Publication history

Issue Date




By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.