Quercitrin

Quercetin’s rhamnose-bound glycoside, a flavonol sugar conjugate spread widely through fruits, vegetables, teas, and wines. It carries the antioxidant activity of its family, and digestion clips off the sugar to release free quercetin for absorption. Its presence contributes to the total flavonoid load of plant-rich diets, which epidemiologists associate with favorable health patterns. For analysts it serves as a marker of fruit and tea authenticity, and its levels shift with variety, ripeness, and processing, making it a useful indicator of raw-material quality.