African Journal of

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12196

Full Length Research Paper

Biochemical response of sweet potato to bemul-wax coating combined with calcium chloride treatment during ambient storage

Afolabi Israel Sunmola2* and Oloyede Oyelola Bukoye1
1University of Ilorin, Faculty of Science, Department of Biochemistry, Food and Nutrition Unit, P.M.B. 1515, Ilorin, Kwara State, Nigeria. 2Covenant University, College of Science and Technology, Department of Biological Sciences, Canaan land, Km 10, Idiroko road, P.M.B. 1023, Ota, Ogun State, Nigeria.
Email: [email protected]

  •  Accepted: 15 March 2011
  •  Published: 04 April 2011


Sweet potato (Ipomoea batatas Linn) tuber is a very nutritious but highly perishable crop that is subject to high wastages due to non-availability of appropriate storage techniques. This work assessed the effectiveness of treating the tubers with calcium chloride dip (CCD), bemul-wax (B-wax) and their combinations (CCD/B-wax) at ambient storage conditions (24.9 ± 4.0°C and 44.6 ± 18.4% RH). Some biochemical parameters of each treated sample were assessed and compared with the control for 20 days storage period. There were significant reductions (P < 0.05) in weight loss by B-wax and CCD/B-wax. CCD and CCD/B-wax caused significant reductions in pH, total amino acid and pectin esterase. Also, all the treatments caused significant reductions in ascorbic acid, phenylalanine ammonia lyase, α-Amylase and alcohol dehydrogenase activities. There were significant reductions in polyphenol oxidase activity by B-wax. In conclusion, while all the treatments proved to be effective to varying degrees, CCD/B-wax seemed to be the most effective in preventing spoilage in the tuber.


Key words: Biochemistry, storage, bemul-wax, calcium chloride dip, combined agent, sweet potato.

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