Food Science and Biotechnology

Korean Society of Food Science and Technology (한국식품과학회)
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Antioxidant Activity and Total Phenolic Content of Callistemon citrinus Extracts

  • Park, Young-Ki (Div. Biotechnology, Korea Forest Research Institute) ;
  • Lee, Wi-Young (Div. Biotechnology, Korea Forest Research Institute) ;
  • Park, So-Young (Div. Biotechnology, Korea Forest Research Institute) ;
  • Ahn, Jin-Kwon (Div. Biotechnology, Korea Forest Research Institute) ;
  • Han, Mu-Seok (Div. Biotechnology, Korea Forest Research Institute)
  • Published : 2005.04.30
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Abstract

Ethanol crude extracts of wood, bark, leaf, and fruit of Callistenwn citrinus were compared for their antioxidant activities based on DPPH (1, 1-diphenyl-2-picrylhydrazyl) radical-scavenging activity and reducing power. Bark extract showed the most potent radical-scavenging activity and reducing power, showing 94.1 and 0.64% at 25 and $100\;{\mu}g/mL$, respectively. Total phenolic content of the bark extracts (275.0 mg GAE/g) was higher than those of others. Further fractionation of the bark extract using hexane, $CH_2Cl_2$, and EtOAc showed EtOAc fraction had the highest antioxidant activity ($IC_{50}\;6.7\;{\mu}g/mL$) and reducing power (0.82 at $100\;{\mu}g/mL$), with total phenolic content of 611.1 mg GAE/g. Total phenolic contents correlated with antioxidant activity ($R^2\;=\;0.7061$) and reducing power ($R^2\;=\;0.7399$).

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