from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An orange crystalline compound, C14H4O2(OH)3CH3, obtained from rhubarb and other plants and used as a laxative.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A purgative resin, 6-methyl-1,3,8-trihydroxyanthraquinone, obtained from some rhubarbs and other plants.
from the GNU version of the Collaborative International Dictionary of English
- n. An orange-red crystalline substance, C15H10O5, obtained from the buckthorn, rhubarb, etc., and regarded as a derivative of anthraquinone; -- so called from a species of rhubarb (Rheum emodei).
from The Century Dictionary and Cyclopedia
- n. In chem., a glucoside (C15H10O5), crystallizing in orange-yellow prisms, found in the bark of buckthorn and in the root of rhubarb.
The product, known as emodin, inhibits an enzyme called 11-Beta-HSD1, which plays a role in resistance to insulin, the hormone that helps clear excess sugar from the blood.
Evolutionary ecology of secondary compounds in ripe fruit: Case studies with capsaicin and emodin.
Using the reverse phase system, this elution sequence is broadly in accordance with their polarities: aloe-emodin polar, and physcion, least polar is eluted last.
Thus those of the emodin type (with substituents in both terminal rings A and C) are usually derived through the acetatemalonate (polyketide) pathway in both higher and lower plants, while the alizarin (without substituents in ring A) type of anthraquinones are derived through the shikimic acid pathway.
Five compounds were identified and assayed, namely aloe-emodin, chrysophanol, emodin, physcion and rhein.
Anthraquinones were consistently eluted in the sequence, aloe-emodin, rhein, emodin, chrysophanol and physcion.
Five compounds - chrysophanol, emodin, physcion, aloe-emodin and rhein - were isolated and identified spectroscopically (UV, IR and MS) and by comparison of the melting points with those reported for chrysophanol, emodin, physcion, aloe-emodin and rhein.
Figure 4B: Influence and radioactivity incorporation of acetate and malonate in aloe-emodin in static cultures of Cassia senna
Figure 3B: Influence and radioactivity incorporation of acetate and malonate in emodin in static cultures of Cassia senna
BUCHALTER, L. (1969) Isolation and identification of emodin from Rumex hymenosepalus.