Antioxidant potential of seaweeds occurring at Karachi coast of Pakistan
AbstractThe oxidative damage caused by reactive oxygen species (ROS) caused damage to bio-molecules leading to various diseases such as cancer, coronary heart diseases, renal failure, diabetes, ageing etc. There is an increasing interest in natural antioxidants because of the safety and toxicity problems of synthetic antioxidant. In this study, antioxidant activity of aqueous and ethanol extracts of 15 different seaweeds and total phenolic contents were evaluated. DPPH (2, 2-Diphenyl-1 -picrylhydrazyl) assay was used to determine free radical scavenging activity. The aqueous extracts showed more promising antioxidant activity as compare to ethanol extracts. Antioxidant activity of most of the seaweed reached at maximum after 180 to 220 minutes and then declined suddenly or gradually. Antioxidant activity of some seaweed was more or less equal to alpha- tocopherol used as standard antioxidant. After 180 minutes, the highest antioxidant activity was found in Caulerpa taxifolia (64.63%), Stokeyia indica (63.67%), Ulva fasciata (63.28%), Dictyota dichotoma var. velutricata (62.74%) as compared to 62.24% of alpha-tocopherol. All the test seaweeds were found to contain polyphenols at various concentrations. However, presence of polyphenol in some seaweeds did not show any correlation with antioxidant activity.
From Volume 92 (2019) on, the content of the journal is licensed under the Creative Commons Attribution 4.0 License. Any user is free to share and adapt (remix, transform, build upon) the content as long as the original publication is attributed (authors, title, year, journal, issue, pages) and any changes are labelled.
The copyright of the published work remains with the authors. If you want to use published content beyond what the CC-BY license permits, please contact the corresponding author, whose contact information can be found on the last page of the respective article. In case you want to reproduce content from older issues (before CC BY applied), please contact the corresponding author to ask for permission.