Glycosides
Start with the big picture
A glycoside’s glycone generally contributes water solubility, stability, and taste masking, while its aglycone largely determines pharmacological or toxicological effects. Glycosides may have O-, C-, N-, or S-linkages; O-glycosides are most common, and hydrolysis can release the aglycone. In plants, storage in vacuoles can keep substrates separate from enzymes until tissue damage. Diagnostic assays help distinguish classes with different properties and uses. Examples include stimulant laxative anthraquinones, inotropic cardiac glycosides, foaming saponins, antioxidant flavonoids, and cyanogenic compounds that can release hydrogen cyanide at toxic doses. The topic also considers processing, metabolic behavior, and herb–drug cautions, emphasizing that natural origin does not remove the need to consider safety.
What you'll learn
- Describe the glycone and aglycone roles in glycoside structure and activity.
- Distinguish O-, C-, N-, and S-glycosidic linkages.
- Explain how plant storage and tissue damage relate to glycoside hydrolysis.
- Identify major glycoside classes and their representative pharmacological or toxicological relevance.
- Recognize the roles of diagnostic assays, processing, and herb–drug cautions.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
