Fractionation of an aqueous extract of root bark from Fagara xanthoxyloides by column chromatography on DEAE-A-50, utilizing an elution gradient of pH 7.5–5.0, yielded five fractions. All fractions reversed metabisulfite-induced sickling in vitro of erythrocytes homozygous for hemoglobin S. Only the fraction containing the least anti-sickling activity also contained alkaloids. Thin-layer chromatography on silica gel and aluminum oxide revealed further molecular heterogeneity within two of the fractions.
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© 1981 S. Karger AG, Basel
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