Abstract：
:The poor membrane permeability and oral bioavailability of the iron chelating agent deferoxamine (DFO) mesylate result from the low octanol/water partition coefficient and high aqueous solubility. With the ultimate aim to improve biomembrane permeability while retaining the iron-binding ability of DFO, a series of more lipophilic amides were prepared by reacting the terminal primary amino group with fatty and aromatic acid chlorides or anhydrides. Octanol/water partition coefficients and equilibrium solubilities of these analogs in solvents, chosen to delineate physicochemical interactions, were determined as a function of temperature. Solid-state properties were evaluated by calorimetry. All DFO amide derivatives had higher melting points, indicating that derivatives formed strong intermolecular interactions in the solid phase. Formamidation of the primary amine of deferoxamine resulted in a 200-fold increase in the octanol/water partition coefficient and reduced aqueous solubility at least 2000-fold compared with the parent molecule. The partition coefficient increased and aqueous solubility decreased 2-fold with the addition of each methylene group in the homologous series of aliphatic amides. Solubilities of the derivatives in water-saturated octanol and hexane showed irregular profiles as a function of increasing aliphatic chain length that were attributed to intermolecular packing in the solid state. The temperature dependence of the partition coefficients was interpreted to indicate that interfacial transfer of the deferoxamine amides was, in part, affected by an apparent diminished ability to form energetically favorable interactions in the water-saturated organic phase.
journal_name
J Pharm Scijournal_title
Journal of pharmaceutical sciencesauthors
Ihnat PM,Vennerstrom JL,Robinson DHdoi
10.1002/1520-6017(200012)89:12<1525::aid-jps3>3.0.subject
Has Abstractpub_date
2000-12-01 00:00:00pages
1525-36issue
12eissn
0022-3549issn
1520-6017pii
S0022-3549(16)30689-Xjournal_volume
89pub_type
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abstract：:Hydrogen triiodide adducts were prepared from N,N-dimethylacetamide, N-alkylpyrrolidone derivatives, and polyvinylpyrrolidone, and their structures were investigated by IR spectra and X-ray structure analyses and compared with the structure of povidone-iodine USP. The results suggest that the iodine in povidone-iodine...
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