Biorelevant characterisation of amorphous furosemide salt exhibits conversion to a furosemide hydrate during dissolution.
Biorelevant dissolution behaviour of the amorphous sodium salt and amorphous acid forms of furosemide was evaluated, together with investigations of the solid state changes during in vitro dissolution in medium simulating the conditions in the small intestine. UV imaging of the two amorphous forms, as well as of crystalline furosemide salt and acid showed a higher rate of dissolution of the salt forms in comparison with the two acid forms. The measured dissolution rates of the four furosemide forms from the UV imaging system and from eluted effluent samples were consistent with dissolution rates obtained from micro dissolution experiments. Partial least squares-discriminant analysis of Raman spectra of the amorphous acid form during flow through dissolution showed that the amorphous acid exhibited a fast conversion to the crystalline acid. Flow through dissolution coupled with Raman spectroscopy showed a conversion of the amorphous furosemide salt to a more stable polymorph. It was found by thermogravimetric analysis and hot stage microscopy that the salt forms of furosemide converted to a trihydrate during dissolution. It can be concluded that during biorelevant dissolution, the amorphous and crystalline furosemide salt converted to a trihydrate, whereas the amorphous acid exhibited fast conversion to the crystalline acid.
Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, Copenhagen, Denmark.
Line Hagner
LH
Nielsen
Sarah
S
Gordon
Jari Pekka
JP
Pajander
Jesper
J
Østergaard
Thomas
T
Rades
Anette
A
Müllertz
D000143:Acids; D002626:Chemistry, Pharmaceutical; D003460:Crystallization; D005665:Furosemide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007419:Intestinal Secretions / Q000737:chemistry; D010713:Phosphatidylcholines / Q000737:chemistry; D012492:Salts; D012995:Solubility; D013656:Taurocholic Acid / Q000737:chemistry
D000143:Acids; D010713:Phosphatidylcholines; D012492:Salts; D013656:Taurocholic Acid; D005665:Furosemide
Amorphous form; Biorelevant dissolution; Furosemide; Raman flow through dissolution; Solid state conversion; UV imaging