Efficient solvent extraction of antioxidant-rich extract from a tropical diatom, Chaetoceros calcitrans (Paulsen) Takano 1968

Su Chern Foo, Fatimah Md Yusoff, Maznah Ismail, Mahiran Basri, Nicholas Mun Hoe Khong, Kim Wei Chan, Sook Kun Yau

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29 Citations (Scopus)

Abstract

Objective: To compare the in vitro antioxidant capacity of a diatom, Chaetoceros calcitrans (. C. calcitrans) extracted using six types of solvents. Methods: Each extract was evaluated in terms of extraction yield, total carotenoid, fucoxanthin content, total phenolic and antioxidant capacities (DPPH and ABTS+ scavenging activity and iron chelating activity). Results: The methanol extract exhibited the highest yield [(22.71 ± 0.96) g/100 g dry weight (DW)], total carotenoid [(4.46 ± 0.36) mg/g DW], total phenolic [(2.49 ± 0.08) mg gallic acid equivalents/g DW] and second highest fucoxanthin content [(2.08 ± 0.03) mg fucoxanthin/g DW] as compared to other solvent extracts. Methanolic extract also exhibited significantly higher (P < 0.05) scavenging (DPPH, ABTS+) and iron chelating activities. Conclusions: Methanol was the recommended solvent for the production of antioxidant rich extract from C. calcitrans. Both carotenoids and phenolic acids were found to be positively correlated to the antioxidant capacities of C. calcitrans. Lead bioactives confirmed by subsequent high performance liquid chromatography studies were fucoxanthin, gallic acid and protocatechuic acid.

Original languageEnglish
Pages (from-to)834-840
Number of pages7
JournalAsian Pacific Journal of Tropical Biomedicine
Volume5
Issue number10
DOIs
Publication statusPublished - Oct 2015
Externally publishedYes

Keywords

  • Antioxidants
  • Chaetoceros calcitrans
  • Diatoms
  • Efficient solvent extraction
  • Fucoxanthin
  • Microalgae
  • Phenolic acids

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