Journal of
Medicinal Plants Research

  • Abbreviation: J. Med. Plants Res.
  • Language: English
  • ISSN: 1996-0875
  • DOI: 10.5897/JMPR
  • Start Year: 2007
  • Published Articles: 3789

Full Length Research Paper

Effects of extraction techniques on phenolic components and antioxidant activity of Mengkudu (Morinda citrifolia L.) leaf extracts

Mohd Sabri Pak-Dek1, Azizah Osman1, Najla Gooda Sahib1, Nazamid Saari1,   Masturah Markom2, Azizah Abdul Hamid1,3* and Farooq Anwar1,4
1Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia. 2Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia. 3Agro-Biotechnology Institute, Ministry of Science, Technology and Innovation of Malaysia, Malaysia. 4Department of Chemistry and Biochemistry, University of Agriculture, Faisalabad 38040, Pakistan.
Email: [email protected]

  •  Accepted: 07 July 2011
  •  Published: 30 September 2011

Abstract

The effect of four extraction techniques namely; solvent extraction (SE), microwave-assisted extraction (MAE), ultrasonic-assisted extraction (UAE) and supercritical fluid extraction (SFE) on the phenolic components and antioxidant activity of Morinda citrifolia leaf extracts was investigated. Total phenolics compounds (TPC) were quantified spectrophotometrically using Follin-Ciocalteu regent method, while the catechins were analyzed by reverse-phase high performance liquid chromatography (RP-HPLC). Antioxidant activity of the extracts was evaluated by determining 2,2-diphenyl-1-picrylhydrazyl (DPPH) capacity and ferric ion reducing antioxidant potential (FRAP). Overall, MAE produced extract exhibited the maximum amount of TPC and catechin while UAE-extract had the highest antioxidant activity. It could be concluded that, even though MAE extract contained high TPC and catechin, the accelerated temperature used during this extraction technique might have attributed to reduce the antioxidant activity of this extract. Therefore, UAE can be recommended for recovery of potent natural antioxidant components from M. citrifolia leaf offering better antioxidant activity.

 

Key words: Morinda citrifolia leaf, antioxidant extraction, total phenolics, ferric reducing potential, 2,2-diphenyl-1-picrylhydrazyl (DPPH), catechin, high performance liquid chromatography (HPLC).