Self-association of doxorubicin and related compounds in aqueous solution

J Pharm Sci. 1984 Jun;73(6):766-70. doi: 10.1002/jps.2600730615.

Abstract

The dimerization of doxorubicin, daunorubicin, and their 4-demethoxy, 4'-epi, and 4'-deoxy analogues was studied spectrophotometrically. Self-association was found to be influenced by buffer composition and ionic strength. Kd values were 1.3 X 10(4) and 2.3 X 10(4) M-1 for doxorubicin and daunorubicin, respectively, and ranged from 3.8 X 10(3) to 6.1 X 10(3) M-1 for the 4-demethoxy analogues. For 4'-epi- and 4'-deoxydoxorubicin, tetramerization has also been considered. On this basis, values of 2.0 X 10(4) and 2.2 X 10(4) M-1 were found, respectively, for the formation constant of the dimerization process. Stability of the dimeric species appears to be strongly influenced by substitution of the chromophore moiety.

MeSH terms

  • Chemistry, Pharmaceutical
  • Daunorubicin / analogs & derivatives
  • Daunorubicin / analysis
  • Doxorubicin* / analogs & derivatives
  • Doxorubicin* / analysis
  • Epirubicin
  • Idarubicin
  • Solutions
  • Spectrophotometry / methods

Substances

  • Solutions
  • Epirubicin
  • 4'-deoxydaunomycin
  • 4-demethoxydoxorubicin
  • 4'-epidaunomycin
  • Doxorubicin
  • esorubicin
  • Idarubicin
  • Daunorubicin