Effect of extraction conditions on total polyphenol content and antioxidant Activity of roselle calyces (hibicus sabdariffa l.) extract
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Biosorption, Cr (VI), Modified chitosan beads, Saccharomyces cerevisiae, HistidineAbstract
The calyx of the roselle plant has long been recognized as a source of antioxidants. The objective of this study was to investigate the effect of extraction conditions including extraction time; extraction temperature and ratio of water to material weight on total solid content, total polyphenol content and DPPH radical scavenging activity of roselle calyxes extract solution. The results showed that total solid content, total polyphenol content and DPPH radical activity of extraction solution of roselle calyxes significantly depended on extraction conditions. Moreover, the DPPH radical scavenging activity showed a positive relationship with total polyphenol content. The roselle calyxes extracted at 900C, for 30 mins and at the ratio of water/roselle calyxes of 10/1 were the most suitable conditions for extraction of total polyphenol content and antioxidant components.
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