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The Quantitative Conversion of Barbaloin to Aloe-Emodin and its Application to the Evaluation of Aloes

1963; Oxford University Press; Volume: 15; Issue: 1 Linguagem: Inglês

10.1111/j.2042-7158.1963.tb12789.x

2042-7158

J W Fairbairn, Svetislav D. Simić,

Phytochemistry and biological activity of medicinal plants

Abstract Barbaloin can be quantitatively converted into aloe-emodin by heating a solution in 4 N hydrochloric acid, containing 4 per cent ferric chloride, for 4 hr. in a boiling water bath under reflux. Each of these numerical conditions can be varied ±10 per cent without significantly altering the yields. The reaction has been successfully applied to the assay of commercial samples of aloes.