Effect of drying methods on phenolics, flavonoids and antioxidant activities in yellow bell flower (Tecoma stans (L.) Juss. ex Kunth) powder
DOI:
https://doi.org/10.55674/cs.v18i1.262946Keywords:
drying methods, yellow bell flower, Antioxidant, Tecoma stans (L.) Juss. ex KunthAbstract
The objective of this research is to study the effect of different drying methods on phenolics, flavonoids and antioxidant activities in yellow bell flower (Tecoma stans (L.) Juss. ex Kunth) powder. These methods include sun and hot air drying at 60 °C for 6 h and 7 h. The flower powder was extracted by water under temperature at 70 °C for 7 min. The extract was analyzed for phenolics, flavonoids, and antioxidant activities. The results found that the powder of hot air drying at 60o C for 6 h has antioxidant activity higher than that of the powder of hot air drying at 60 °C for 7 h and sun drying, respectively. The powder has total phenolics and flavonoids as 16.381±0.836 mg GAE g-1 powder and 4.920±0.154 mg CE g-1 powder, respectively. DPPH free radical scavenging activity is 0.520±0.039 mg AAE g-1 powder. ABTS free radical scavenging activity is 6.186±0.046 mg AAE g-1 powder). Ferric reducing antioxidant power is 17.582±0.682 µmol Fe2+ E g-1 powder. Total antioxidant capacity is 71.030±0.902 mg AAE g-1 powder. These results indicated that the sun and hot air drying under different temperature and time, affected on content of phenolics, flavonoids and antioxidant activities in yellow bell flower (T. stans) powder.
GRAPHICAL ABSTRACT
HIGHLIGHTS
- Preparation of yellow bell flower powder by sun and hot air drying method
- Preparation of the flower extract
- Measurement of active components and antioxidant capacity
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