Polyphenol Contents and Polyphenol Oxidase Activities of Some Nigerian Kolanuts


Authors

  • T.P. Prohp Department of Medical Biochemistry, College of Health Sciences Niger Delta University, Wilberforce Island, Bayelsa State, Nigeria
  • K.E. Ekpo Department of Biochemistry, Ambrose Alli University, Ekpoma, Edo State, Nigeria
  • E.V. Osagie Department of Biochemistry, Ambrose Alli University, Ekpoma, Edo State, Nigeria
  • A. Osagie Department of Medical Biochemistry, College of Medicine, Ambrose Alli University, Ekpoma, Edo State, Nigeria
  • H. Obi Department of Biochemistry, Ambrose Alli University, Ekpoma, Edo State, Nigeria

DOI:

https://doi.org/10.3923/pjn.2009.1030.1031

Keywords:

Nigeria kolanuts, polyphenol, polyphenol oxidase

Abstract

The levels of polyphenol and activities of polyphenol oxidases in some Nigerian kolanuts were investigated. Garcina cola had the least polyphenol content of 15.60±1.70 (mg/g), while Cola nitida (red) recorded the highest value of 33.50±2.51mg/g. Polyphenol oxidase from Garcina cola had its optimum pH of activity in the acidic region (pH 3), but the white and red species of Cola nitida had a neutral (pH 7) optimum pH. With catechol as substrate, polyphenol oxidase activity was highest in Cola nitida (white) (55.70±2.60) and lowest in Garcina cola (2.22 ± 0.04). Whilst the values of polyphenol obtained may explain the high incidence of enzymatic browning in some Nigeria kolanuts, the white cultivar of Cola nitida could be further explored as a good source of polyphenol oxidase.

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Published

15.06.2009

Issue

Vol. 8 No. 7 (2009)

Section

Research Article

License

Copyright (c) 2009 Asian Network for Scientific Information

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.

How to Cite

Prohp, T., Ekpo, K., Osagie, E., Osagie, A., & Obi, H. (2009). Polyphenol Contents and Polyphenol Oxidase Activities of Some Nigerian Kolanuts. Pakistan Journal of Nutrition, 8(7), 1030–1031. https://doi.org/10.3923/pjn.2009.1030.1031