DETERMINATION OF BIOREACTIVE COMPOUNDS IN THE CITRUS PEEL TEA EXTRACT (Citrus nobilis)
Main Article Content
Abstract
Aims: To determine the bioreactive compounds in tea made from the peel of Citrus nobilis grown in Can Tho, Viet Nam through assessing antioxidant, anti-inflammatory activities, and α-amylase enzyme inhibition of C. nobilis peel tea.
Methods: The peel of Citrus nobilis tea was qualitatively analyzed for certain bioactive compounds and quantitatively for total polyphenols and total flavonoids. Antioxidant activity was determined by free radical scavenging
efficiency through reactions with DPPH and ABTS, along with ferric reducing antioxidant power (FRAP). In vitro anti-inflammatory activity was investigated through protein denaturation inhibition. Inhibition of α-amylase enzyme was assessed by the peel of Citrus nobilis tea extract through the iod-starch color reaction.
Results: Results showed that there are the presence of bioactive compounds in the Citrus nobilis peel tea extract, including alkaloids, flavonoids, phenolics, saponins, terpenoids, and tannins. The total polyphenol and total flavonoid content were 16.03±1.22 mg GAE/g peel of Citrus nobilis tea extract and 35.67±1.18 mg QE/g peel of the Citrus nobilis tea extract, respectively. Antioxidant activity determined by DPPH, ABTS, and FRAP methods showed IC50 values of 244.70±2.78 μg/mL, 319.66±2.88 μg/mL, and 228.75±2.69 μg/mL, respectively. Furthermore, the peel of the Citrus nobilis tea extract also exhibited significant in vitro anti-inflammatory activity, with an IC50 value of 469.79±3.16 µg/mL. Additionally, the the Citrus nobilis tea extract demonstrated α-amylase enzyme inhibition in vitro with an IC50 value of 1105.26±1.32 μg/mL.
Conclusion: Citrus nobilis peel tea contains many important bioactive compounds beneficial to human health, which remain intact when processing the peel into tea. The Citrus nobilis peel extract also exhibits biological activities. The peel of Citrus nobilis can be used in the food industry to enhance the value of Citrus nobilis.
Article Details
Keywords
α-amylase inhibitory, antioxidant, anti-inflammatory, bioactive compounds, Citrus nobilis peel tea
References
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