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Optimisation de l'utilisation du taro (Colocasia esculenta) variété lamba en panification par l'usage de la gomme Grewia mollis. Juss (Famille Tiliaceae)

Abstract : The problem in this study is the incorporation of Grewia gum in the wheat-taro mixture in order to improve the level of substitution of wheat flour by taro flour which, according to the literature, cannot exceed 10-15% without deteriorating in a considerable manner the quality of the bread paste. The objective defined in this study is threefold : (1) to know the properties of the flour of taro Lamba variety which, before this study have not been the object for research (2) to determine the optimum conditions for extraction of the Grewia gum, with known physico-chemical and functional characteristics but no standard for conditions extraction. (3) To study the effect of the percentage of gum, taro flour and wheat flour on the rheological and sensory properties of the paste and the bread using a mixture designs with three components. In this study the usual methods of characterization were used. For objective 1, the experimental device takes into account sizes of tuber (4 weight) like factors, and the measured parameters are: the proximate composition, the granulometry and the shape of particles, thermal and rheological properties of the flour. For objective 2, the gum is extracted using a central composite design with faces centered with factors like the flour water ratio (w / w), the temperature, extraction time and pH, the response were the viscosity of the solution and the yield of extraction. A characterization of the sugar profile of gum was made. For objective 3, a ternary mixture design Grewia - taro-wheat with constraints was carried out. The volume of dough, the rheology of paste, the double bite test, the creep-recovering test were measured on the dough, whereas a double compression test analysis and acceptability were carried out on the bread. The results of objective 1 showed that the physico-chemical composition of the taro varies as a function of the mass and peeling type, the amino acid profile reveals the absence of sulphur amino acids. The results of the extraction of gum showed that only the ratio significantly increases the viscosity and the yield of the gum.The optimum conditions for extraction of the Grewia gum are as follows:pH: 7.1 times : 1h temperature: 73 °C water / powder ratio: 55.4 / 1, for a viscosity of 0.98 Pa.s and and yield of 0.32 %. The results of objective 3 show that the incorporation of gum increase the water absorption capacity, viscoelasticity of the dough, volume of the dough and even volume of bread. However the sensory analysis showed that the addition of gum up to 5% contributed to the rejection of the breads
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Submitted on : Thursday, March 29, 2018 - 1:19:36 PM
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Emmanuel Panyoo Akdowa. Optimisation de l'utilisation du taro (Colocasia esculenta) variété lamba en panification par l'usage de la gomme Grewia mollis. Juss (Famille Tiliaceae). Alimentation et Nutrition. Université de Lorraine, 2014. Français. ⟨NNT : 2014LORR0303⟩. ⟨tel-01751450⟩



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