Rutinoside

Rutinoside, also called quercetin‑3‑O‑rutinoside or rutin, is a flavonoid glycoside found in a variety of plants. The name refers to the disaccharide rutinose (a rhamnose unit linked to a glucose unit) that is attached to the flavonol aglycone quercetin. Because the sugar moiety is rutinose, many compounds bearing this group are collectively known as rutinosides; the most common example is rutin itself.

The chemical formula of the principal rutinoside, rutin, is C27H30O16. Its structure consists of quercetin, a polyphenolic flavonol, esterified at the 3‑hydroxyl position with a β‑rutinosidic linkage to the disaccharide. In solution the molecule exhibits strong antioxidant activity due to the quercetin nucleus, while the sugar moiety influences solubility and metabolic stability.

Rutinosides are widely distributed in the plant kingdom. They occur in citrus fruits (oranges, lemons, grapefruits), buckwheat, onions, tea, apples, and many herbs. The disaccharide rutinose is generated in plants through a specific UDP‑rhamnose–glucose transferase that adds rhamnose to a glucose donor, forming the glycosidic bond that defines the rutinoside class.

Commercial interest centers on rutin’s health‑related properties. It has been studied for its antioxidant, anti‑inflammatory, and capillary‑strengthening effects and is used as a dietary supplement, a food additive, and an ingredient in topical preparations for skin health. The compound also enhances the activity of vitamin C and can improve vascular permeability.

Rutinoside is generally recognized as safe when consumed at typical dietary levels; excessive intake may cause gastrointestinal upset. It can be isolated from plant extracts by solvent extraction and chromatography, and industrial synthesis routes are available that combine chemically generated quercetin with a protected rutinosyl donor.

Rutinoside’s classification as a flavonoid glycoside, its widespread botanical occurrence, and its established role in nutrition and medicine make it a prominent compound in both scientific research and commercial applications.