Study finds anthocyanins distinguish red table grape cultivars in China

A study published in Food Chemistry reports that red table grape varieties grown in China show clear differences in their flavonoid composition, with anthocyanins standing out as the strongest markers for distinguishing cultivars and assessing fruit quality.

The research examined anthocyanins, flavonols and flavanols in several red table grape cultivars. These compounds are important because they shape color, taste and antioxidant properties in grapes. According to the study, the types and concentrations of these flavonoids varied significantly from one cultivar to another, pointing to a strong genetic effect on grape quality.

The authors found that anthocyanin profiles were especially useful for identifying differences among cultivars. That matters because anthocyanins are closely tied to the red and purple coloration of grapes, a trait that often influences consumer perception of freshness and quality. In the study, flavonols and flavanols also differed across cultivars, though less sharply than anthocyanins. Even so, they still played a role in sensory traits and antioxidant capacity.

The work focused on compositional profiling, meaning the researchers mapped the presence and relative abundance of these compounds across the grape samples they analyzed. Their goal was to test whether flavonoids could serve as quality-indicative markers. Based on the results, the study suggests that some flavonoid signatures may help breeders and growers identify cultivars with more desirable quality traits.

The findings add to a broader effort to connect plant chemistry with agricultural selection. For breeders, that could mean using flavonoid patterns as part of cultivar development programs. For producers, it may offer another tool for deciding which grape varieties to plant when targeting specific market preferences related to appearance, flavor and nutritional value.

The results may also have implications beyond fresh fruit. Phenolic compounds such as anthocyanins, flavonols and flavanols are central to color stability, mouthfeel and perceived quality in wine and other grape-based beverages. While this study focused on table grapes rather than winemaking grapes, the chemical differences it identified could still be useful as a reference point for beverage producers and raw material suppliers interested in how grape composition may affect processing potential and final product character.

The paper says the observed variation among cultivars underscores how strongly genetics can shape the chemical profile of grapes. That is relevant at a time when growers in major producing regions are under pressure to improve consistency, meet consumer expectations and select varieties that can deliver both visual appeal and eating quality.

By identifying anthocyanins as particularly reliable indicators, the study offers a more precise way to evaluate red table grape quality at the cultivar level. It also reinforces the idea that not all red grapes carry the same chemical traits, even when grown within the same country and production context.

The study was published on ScienceDirect on June 15 and presents its findings as a resource for targeted cultivation and future breeding decisions aimed at improving grape quality through specific flavonoid profiles.