African Journal of
Food Science

  • Abbreviation: Afr. J. Food Sci.
  • Language: English
  • ISSN: 1996-0794
  • DOI: 10.5897/AJFS
  • Start Year: 2007
  • Published Articles: 804

Full Length Research Paper

Effect of gamma irradiation on pasting characteristics and resistant starch levels of starches from locally-improved cassava accessions

Agyei-Amponsah J*
  • Agyei-Amponsah J*
  • Radiation Technology Centre, Biotechnology and Nuclear Agriculture Research Institute, Ghana Atomic Energy Commission, P. O. Box LG 80, Accra, Ghana.
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Asare I. K.
  • Asare I. K.
  • Radiation Technology Centre, Biotechnology and Nuclear Agriculture Research Institute, Ghana Atomic Energy Commission, P. O. Box LG 80, Accra, Ghana.
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Agbemavor W. S. K.
  • Agbemavor W. S. K.
  • Radiation Technology Centre, Biotechnology and Nuclear Agriculture Research Institute, Ghana Atomic Energy Commission, P. O. Box LG 80, Accra, Ghana.
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Owureku-Asare M.
  • Owureku-Asare M.
  • Radiation Technology Centre, Biotechnology and Nuclear Agriculture Research Institute, Ghana Atomic Energy Commission, P. O. Box LG 80, Accra, Ghana.
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Apatey J.
  • Apatey J.
  • Radiation Technology Centre, Biotechnology and Nuclear Agriculture Research Institute, Ghana Atomic Energy Commission, P. O. Box LG 80, Accra, Ghana.
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Ayeh E. A.
  • Ayeh E. A.
  • Radiation Technology Centre, Biotechnology and Nuclear Agriculture Research Institute, Ghana Atomic Energy Commission, P. O. Box LG 80, Accra, Ghana.
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Acquah S.
  • Acquah S.
  • Radiation Technology Centre, Biotechnology and Nuclear Agriculture Research Institute, Ghana Atomic Energy Commission, P. O. Box LG 80, Accra, Ghana.
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Ocloo F. C. K.
  • Ocloo F. C. K.
  • Radiation Technology Centre, Biotechnology and Nuclear Agriculture Research Institute, Ghana Atomic Energy Commission, P. O. Box LG 80, Accra, Ghana.
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  •  Received: 05 August 2015
  •  Accepted: 21 October 2015
  •  Published: 30 December 2015

Abstract

The purpose of this study was to determine the effects of gamma irradiation on pasting characteristics and resistant starch (RS) levels of starches from some locally-improved cassava accessions. Three cassava accessions were collected from Ministry of Food and Agriculture-Root and Tuber Section at Pokuase, Accra, Ghana. Approximately, 10 kg of each accession was used for the starch extraction. Samples were irradiated at 0 (Control), 5, 10, 15 and 20 kGy. Pasting characteristics and RS levels of starch samples were evaluated. “Ankrah” recorded the highest RS levels (58.24 to 69.97%) amongst the three improved cassava starch accessions with TME 419 having the least RS content. Irradiation significantly (p < 0.05) affected RS content, with the highest RS content obtained at 10 kGy absorbed dose. “Bosome Nsia” recorded the highest levels of non-resistant starch (NRS) content (47.56 to 63.16%) with values increasing gradually with increasing irradiation dose. Gamma irradiated modified “Ankrah” starch had the lowest gelatinization temperature, lowest maximum viscosity and highest setback and breakdown viscosities implying a good substitute to be used in food preparations.

 

Key words: Cassava starch, modification, gamma irradiation, resistant starch, pasting characteristics.