Assessment of Antioxidant and Phenolics Content of Various Drying Techniques (Hibiscus sabdariffa roselle L.) Calyx UKMR-1

Providing food, clothing, shelter, and medicine, plants
have played a critical role in human existence for mil
lennia. The utilization of roselle (Hibiscus sabdariffa
L.) calyx as a source of anthocyanins has been studied
through rigorous investigations. Due to its perishable
feature, the transformation of roselle calyces into dried
without decreasing in their quality is highly difficult.
This research was aim to determine effect various
drying techniques of roselle sun, oven and freeze
drying. Antioxidant, phenolic, flavonoids and
anthocyanin content were determined. The studies
revealed that freeze drying retained the antioxidant
qualities, rate of drying increased significantly than
oven and sun drying. It is concluded in other to retain
the roselle calyces extract quality freeze drying
methods should be employed.