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The Journal of Food Technology in Africa
Innovative Institutional Communications
ISSN: 1028-6098
Vol. 7, No. 1, 2002, pp. 4-8
Bioline Code: ft02002
Full paper language: English
Document type: Research Article
Document available free of charge

The Journal of Food Technology in Africa, Vol. 7, No. 1, 2002, pp. 4-8

 en A Comparative Study of the Syneresis of Yam Starches and Other Modified Starches
Amani N. G., Tetchi F. A., Dufour D. and Kamenan A.

Abstract

The syneresis of starch gels from 19 yam cultivars (belonging to 4 Dioscorea check for this species in other resources species and complex of species) and 5 modified starches were studied during refrigeration (4°C) and freezing (-20°C).

Syneresis of starch gels evolved on refrigeration at the onset from zero and remained constant between 20% to 60% after 8 weeks of storage for all the yam species. The cultivars Daminangba check for this species in other resources ( Dioscorea alata check for this species in other resources ) and Assawa check for this species in other resources ( Dioscorea cayenensis check for this species in other resources ) were the most refrigeration-resistant. During freezing, syneresis of yam gels evolved from zero and remained constant in the 56 - 70% interval for the D. alata, 35 - 70% for the D. cayenensis-rotundata complex, and 37 - 55% for D. dumetorum and D. esculenta. The Kpokpokpo(D. cayenensis-rotundata) was the most freeze-resistant cultivar. The resistance during refrigeration of Daminangbaand Assawa, as well as the freeze resistance of Kpokpokpo were in all cases less than those of Amiocaand Colflo 67, the best modified commercial starches. Treatment of yam gels with appropriate doses of hydrophilic ingredients might be necessary to reduce their syneresis to acceptable levels.

Keywords
Syneresis, Refrigeration, Freezing, Stability, Yam starch

 
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