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Comfrey (Symphytum officinale L.) root; its anatomy and its detection in admixture with chicory in dandelion coffee.
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[Obstructive ileus after ingestion of comfrey (radix Symphyti)].
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[Comfrey, a folk remedy not without harmful effects].
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Structure and toxicity of the alkaloids of Russian comfrey (symphytum x uplandicum Nyman), a medicinal herb and item of human diet.
Eight pyrrolizidine alkaloids of hepatotoxic type have been indentified in leaves of Symphytum X uplandicum. The combined alkaloids exhibit chronic hepatotoxicity in rats.
Hepatotoxicity due to comfrey herb tea.
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Comfrey herb tea-induced hepatic veno-occlusive disease.
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Toxic pyrrolizidine alkaloids in comfrey.
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Comfrey toxicity in perspective.
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Atropine as possible contaminant of comfrey tea.
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Comfrey herb tea and hepatic veno-occlusive disease.
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Atropine as possible contaminant of comfrey tea.
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Isolation of symlandine from the roots of common comfrey (Symphytum officinale) using countercurrent chromatography.
Three pyrrolizidine alkaloids, symlandine, symphytine, and echimidine (1-3), were isolated from the roots of Symphytum officinale using a one-step countercurrent chromatography procedure. The structures of 1-3 were confirmed by several spectroscopic techniques including 2D NMR methods. This is the first description of the separation of symlandine (1) from its stereoisomer, symphytine (2).
The effect of an aqueous extract of comfrey on prostaglandin synthesis by rat isolated stomach.
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Veno-occlusive disease of the liver secondary to ingestion of comfrey.
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Toxicity of comfrey-pepsin preparations.
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