ISSN 2736-1756
Advanced Journal of Microbiology Research Vol. 2005
Available online at http://internationalscholarsjournals.org/journal/ajmr
© 2005 International Scholars Journals
Full Length Research Paper
Stability of yam starch gels during processing
N’Guessan Georges Amani1*, Alphonse Kamenan1 Agnès Rolland-Sabaté2, and Paul Colonna2
1Universityof Abobo-adjamé, UFR/STA, 02 BP 801, Abidjan, Côte d'Ivoire.
2INRA, rue de la Géraudière, BP 71627, 44316 Nantes, France.
Accepted 5 December, 2004
Abstract
To evaluate their aptitude to be used as functional ingredients, twenty one varieties of yam starches of Côte d’Ivoire were submitted to different technological stress such as high temperature treatment, long term freezing and refrigeration, high speed shearing and acidic treatment, in comparison with commercial modified starches. The gel of “kangba” starch (D. Cayenensis-rotundata) is the most stable during thermal processing. The cultivar “Daminangba” ( D. alata) which present the clearest gel (63 % of clarity) is also the most stable during refrigeration with a low syneresis (26%) at 4°C.The “Esculenta 7” cultivar (D. esculenta) shows the weakest value of syneresis at -20°C. The gel of D. dumetorum species is the strongest under acidic condition with 8% of viscosity decrease from pH 7 to pH 3, whereas the “Bodo” cultivar ( D. alata) gel shows good resistance to shearing with 31% fall of viscosity from 160 rpm to 900 rpm on the RVA. The “Sopèrè”, “Lopka” and Kponan cultivars (D. Cayenensis–rotundata) present the strongest viscosities in all the technological treatments.
Key words: Yam starch, modified starch, functional properties, gel stability.