A process for recovering the sweet principles, diterpene glycosides from the leaves of Stevia rebaudiana comprises drying the leaves in vacuo at 50deg.C macerating the dried leaves of Stevia r. to a fine powder, contacting the powdered leaf material with a moderately polar solvent selected from a cycloaliphatic ether which contains at least two oxygen atoms in the ring and a satd. aliphatic ether to remove the diterpene glycosides together with non-polymeric impurities at room temp. filtering removing the moderately polar solvent at 40-50deg.C in vacuo, to afford prod. and subjecting prod. A with a selective organic solvent selected from a halohydrocarbon or an aliphatic ester at room temp. to remove the non-polymeric impurities, filtering to afford the desired mixt. of diterpene glyco glycosides known as prod. B
Immobilised onium salts gas phase prepn.
TUNDO, Pietro;
1987-01-01
Abstract
A process for recovering the sweet principles, diterpene glycosides from the leaves of Stevia rebaudiana comprises drying the leaves in vacuo at 50deg.C macerating the dried leaves of Stevia r. to a fine powder, contacting the powdered leaf material with a moderately polar solvent selected from a cycloaliphatic ether which contains at least two oxygen atoms in the ring and a satd. aliphatic ether to remove the diterpene glycosides together with non-polymeric impurities at room temp. filtering removing the moderately polar solvent at 40-50deg.C in vacuo, to afford prod. and subjecting prod. A with a selective organic solvent selected from a halohydrocarbon or an aliphatic ester at room temp. to remove the non-polymeric impurities, filtering to afford the desired mixt. of diterpene glyco glycosides known as prod. B
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