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Blood oranges, known for their vibrant red flesh and potential health benefits, could get even better for consumers thanks to a new University of Florida study. Researchers found that storing these oranges at cooler temperatures significantly boosts their levels of anthocyanins, antioxidants linked to anti-inflammatory and other health benefits. However, the jury’s still out on whether Florida citrus growers can capitalize on this discovery.
“While blood oranges generally fetch higher prices than other varieties, it’s uncertain if farmers can significantly increase their profits by adding them and storing them for color development,” cautions Ali Sarkhosh, a UF/IFAS associate professor of horticultural sciences. Lead author Fariborz Habibi elaborates, “The improved quality from storage is promising, but more research is needed before recommending anything to growers.”
Blood oranges boast a wealth of health-promoting compounds, including anthocyanins, vitamin C, flavonoids, and dietary fiber. The study, conducted at the UF/IFAS North Florida Research and Education Center, revealed that storing the oranges between 40 and 53 degrees Fahrenheit (4.4 to 11.7°C) significantly increased their anthocyanin, phenolic content, and overall antioxidant levels. Interestingly, storing them at slightly cooler temperatures (43 to 46 degrees Fahrenheit or 6.1 to 8.3°C) helped preserve fruit firmness, weight, and sugar content – all crucial factors for maintaining quality and taste.
Blood oranges get their distinctive name from their deep red flesh, a result of a pigment called anthocyanin. These oranges thrive in cool Mediterranean climates, where temperatures stay above freezing but remain relatively cold. While California boasts some blood orange cultivation in the US, Florida’s subtropical climate rarely reaches the necessary cool periods for anthocyanin development.
The study also offers good news for consumers. “Similar conditions can promote internal color development at home,” says Sarkhosh. “However, store-bought oranges should already have good internal color and be ready to enjoy.”
While the health benefits of chilled blood oranges are promising, further research is needed to determine the feasibility of large-scale blood orange production in Florida. This study paves the way for exciting possibilities, but more work is needed before Florida citrus growers can add this vibrant fruit to their repertoire.
