Kinetics of iron-mediated artemisinin degradation: effect of solvent composition and iron salt.

Abstract:

:The antimalarial endoperoxides, such as artemisinin, are postulated to exert their potent parasiticidal activity via the formation of reactive intermediates in the iron-rich infected erythrocyte. The in vitro chemical reaction profile of putative endoperoxide antimalarials and ferrous iron is often qualitatively used to assess their potential antimalarial activity and to develop a structure-reactivity relationship. This study utilized LCMS to monitor the kinetics of artemisinin degradation and product formation in the presence of iron. A second order degradation reaction (k = 18 M(-1) h(-1)) was observed from the reaction of artemisinin with ferrous sulphate in aqueous acetonitrile to produce a number of stable isomeric rearrangement products. A systematic study of the effect of a number of solvent systems and different iron salts showed pronounced changes in reaction rate and product distribution. The significant effects observed in the current study highlight the need to carefully control reaction conditions when studying peroxide antimalarial stability or attempting to develop in vitro/in vivo correlations of endoperoxide antimalarials and their reactivity with iron.

journal_name

J Pharm Sci

authors

Creek DJ,Chiu FC,Prankerd RJ,Charman SA,Charman WN

doi

10.1002/jps.20400

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

1820-9

issue

8

eissn

0022-3549

issn

1520-6017

pii

S0022-3549(16)31818-4

journal_volume

94

pub_type

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