Effect of oven and microwave drying on polyphenols content and antioxidant capacity of herbal tea from Strobilanthes crispus leaves

Lasano, Nur Fatimah and Rahmat, Asmah and Ramli, Nurul Shazini and Abu Bakar, Mohd Fadzelly (2018) Effect of oven and microwave drying on polyphenols content and antioxidant capacity of herbal tea from Strobilanthes crispus leaves. Asian Journal of Pharmaceutical and Clinical Research, 11 (6). pp. 363-368. ISSN 24553891

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Official URL: http://dx.doi.org/10.22159/ajpcr.2018.v11i6.24660

Abstract

Objective: This study aimed to evaluate the effect of oven and microwave drying on total phenolic content (TPC), total flavonoid content (TFC), and antioxidant capacity of unfermented and fermented tea developed from Strobilanthes crispus leaves. Methods: TPC and TFC were estimated using a spectrophotometric method, while antioxidant capacity was determined using ferric reducing antioxidant power assay and 2,2-diphenyl-1-picrylhydrazyl radical scavenging assay. Camellia sinensis (tea plant), that is, used for the production of all varieties of commercial tea and fresh S. crispus leaves were served as controls in this study. Results: The highest antioxidant activity and TPC were observed in S. crispus tea developed from microwave-dried leaves, while the highest TFC was observed in oven-dried tea. Unfermented S. crispus tea showed significantly higher values (p<0.05) for antioxidant activity, TPC, and TFC as compared to fermented S. crispus tea. A strong and moderate correlation was observed between antioxidant activity and TPC as well as TFC values. Conclusion: The present work clearly showed that S. crispus tea developed from microwave-dried leaves able to preserve the polyphenols and hence contribute to excellent antioxidant capacity. Incorporation of unfermented S. crispus tea in the diet can be a good source of natural antioxidant.

Item Type:Article
Uncontrolled Keywords:Green tea; black tea; total phenolic; total flavonoid; 2,2-diphenyl-1-picrylhydrazyl; ferric reducing antioxidant power assay
Subjects:R Medicine > RS Pharmacy and materia medica
Divisions:Faculty of Applied Science and Technology > Department of Technolgy and Heritage
ID Code:11171
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:13 May 2019 09:12
Last Modified:13 May 2019 09:12

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