Assessment of antioxidant properties, instrumental and sensory aroma profile of red and white Karkade/Roselle (Hibiscus sabdariffa L.)

The antioxidant properties of the water extract of Hibiscus sabdariffa L. as well as their aroma profile were investigated. The samples analyzed were three red (Al-Rahad, Al-Fashir, Al-Gezira) and one white varieties. Total phenolic content, total flavonoid content, total anthocyanin content, ferric reducing antioxidant power and radical scavenging activity (RSA %) were measured spectrophotometrically. The red varieties of Karkade showed better...