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Original Article

Inactivation of amphotericin B by reducing agents: Influences on growth inhibition of Candida albicans and lysis of erythrocytes

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Pages 132-142 | Published online: 09 Jul 2009
 

Abstract

Reducing agents, both organic and inorganic, decreased the biological activity of amphotericin B. Cysteine-HCl, sodium sulfite, sodium dithionite, and sodium thiosulfate annulled amphotericin-mediated growth inhibition of susceptible organisms. These compounds also protected mouse erthrocytes from amphotericin-induced hemolysis. The reducing agents reacted, apparently irreversibly, with the heptaene chromophore of the antibiotic molecule. This reaction was reflected in altered spectrophotometric properties of the antibiotic and was associated with its loss of activity.

Resume

Les agents reducteurs, aussi bien organiques qu'inorganiques diminuent l'activité biologique de l'amphotéricine B. Le chlorhydrate de cysteine, le sulfite de sodium, l'hydrosulfite de sodium et le thiosulfate de sodium annulent l'effet de l'amphotéricine B sur la croissance des organismes sensibles. Ces composés protègent également les érythrocytes de la souris contre l'action hemolytique de l'amphotéricine. Les agents réducteurs agissent, de façon apparemment irréversible, sur le chromophore heptaène de la molécule de l'antibiotique. Cette rèaction produit également un changement dans les propriétés spectrophotométiques de l'antibiotique et est associée avec la perte de son activité.

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