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    Influence of sonication on the phenolic content and antioxidant activity of Terminalia catappa L. leaves

    H. V. Annegowda1★, L. N. Anwar1, M. N. Mordi1, S. Ramanathan1, S. M. Mansor1★ Corresponding author

    1. 1aCentre for Drug Research, Universiti Sains Malaysia, 118 00 Penang, Malaysia

    CORRESPONDENCE

    H. V. Annegowda

    *Address for correspondence: H.V. Annegowda, Centre for Drug Research, Universiti Sains Malaysia, 11800 Penang, Malaysia.

    annegowdahv@gmail.com

    Received: 05-08-2010; Revised: 20-09-2010; Accepted: 12-01-2011.

    Volume 2, Issue 6 · pp. 368–373 · PUBLISHED January 2010 · DOI: 10.4103/0974-8490.75457

    View on Pharmacogn. Res. original site ↗

    ABSTRACT

    Aim This study was designed to evaluate the phenolic content and antioxidant activity of ethanolic extracts from T. catappa leaves obtained by different intervals of sonication. Methods Three commonly used methods were followed to evaluate phenolic content and four in vitro methods like 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) radical scavenging assay, ferric reducing antioxidant potency (FRAP), and total antioxidant capacity assays for measuring the antioxidant activities. Antioxidant values of these assays were expressed in terms of milligrams vitamin C equivalent (VCE) antioxidant activities. Results This study showed that extract obtained with 40 minutes of sonication possessed significant (P < 0.05) polyphenolic contents compared to 20 and 60 minutes sonication and control (24 hour maceration). Moreover, sonication of T. catappa leaf above 40 minutes was found to be unsuitable for extracting out phenolic contents. Even the results of antioxidant assays showed that 40 minutes of the sonicated extract exhibited significant (P < 0.05) VCE values compared to extracts obtained at different intervals of sonication and control. Conclusions In sonication extraction method 40 minutes is an ideal time to obtain extract enriched with high polyphenolic content with good antioxidant activity from T. catappa leaves.

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      Annegowda, H. V., Anwar, L. N., Mordi, M. N., Ramanathan, S., & Mansor, S. M. (2010). Influence of sonication on the phenolic content and antioxidant activity of Terminalia catappa L. leaves. Pharmacognosy Research, 2(6), 368–373. https://doi.org/10.4103/0974-8490.75457