Aglycon character

Many solvents such as methanol, acetone, ethanol, and water are used for anthocyanin extraction due to their polar character since most anthocyanins occur naturally as glycosides. Anthocyanin glycosides have higher solubility in water than the corresponding aglycons. In addition, in most fruits and vegetables, anthocyanin pigments are located in cells near the surface. " ... 

Veratramine could not be the original aglycone of cycloposine by reason of the molecular weight, lack of aromatic character, the presence of an ether bridge, and mass spectrometric fragmentation. 

Coumarins (aglycones) seem acid and have a harsh character. Their glycosides are very bitter. 

Luyten I, Thibaudeau C, Sandstrom A, Chattopadhyaya J (1997) The tunable transmission of the aromatic character of the aglycon through the anomeric effect in C-nucleosides drives-its own sugar conformation a thermodynamic study. Tetrahedron 53 6433-6464... 

Outline. Saponins, sometimes termed saponosides, are glycosidic derivatives of steroids or polycyclic triterpenes which - dissolved in water - behave like soaps (lat. sapo ), i.e., produce a stable foam, emulsify fatty oils, and stabilize suspensions. They are able to lower the surface tension of aqueous solutions and to cause haemolysis. This is due to their lyobipolar character which is based on the lipophilic aglycone and the highly hydrophilic carbohydrate moiety. There is only one report on triterpenoid saponins in the Solanaceae (Cestrum parqui L Herit., see Sect. 7.5.1.), whereas steroidal saponins are common metabolites of this family. Saponins do not occur in the Convolvulaceae. 

The most important property of saponins is their ability to form very stable foam as a consequence of their surfactant ability. The presence of polar groups in the sugar moiety together with the non polar character of the aglycone moiety enables saponins... 

---