pH-dependent spectroscopy of tetracycline and its analogs.
J Fluoresc
; 24(4): 1183-98, 2014 Jul.
Article
em En
| MEDLINE
| ID: mdl-24806484
ABSTRACT
Tetracyclines (TCs), broad spectrum antibiotics widely used in the prevention and treatment of infectious diseases, are amphoteric molecules containing several ionizable functional groups that exist predominantly as zwitterions at a given pH value. TCs are reported to undergo a wide variety of reactions at different pH values i.e. TCs form to anhydrotetracyclines at low pH, 4-epitetracyclines at pH 3-5 and isotetracyclines at high pH values. The pH-dependent absorbance and emission properties of tetracycline and its 10 analogs (4-epitetracycline, doxycyline, oxytetracycline, chlortetracycline, 4-epichlortetracycline, isochlortetracycline, methacycline, rolitetracycline, minocycline, and demeclocycline) were investigated and reported in this paper. The main focus of the study was on the pH dependent transformation of epichlortetracycline, chlortetracycline and isotetracycline at basic pH. Absorption, emission and time resolved spectroscopy were used to determine the behavior of the three TC derivatives at this condition. Increasing the buffer's ionic concentration leads to faster transformation to iCTC. A pH dependent transformation of CTC to iCTC was observed and the lifetimes of CTC and iCTC were determined to be 3.0 and 5.89 ns respectively. The distribution factor of CTC to iCTC at basic pH was also reported for the first time.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Tetraciclinas
Idioma:
En
Revista:
J Fluoresc
Assunto da revista:
BIOFISICA
Ano de publicação:
2014
Tipo de documento:
Article