Propriétés nutritionnelles et fonctionnelles des protéines de tourteaux, de concentrats et d'isolats de Ricinodendron heudelotii (Bail.) Pierre ex Pax et de Tetracarpidium conophorum (Müll. Arg.)

Abstract : This study was conducted in order to look for alternative sources of proteins having nutraceutic value. The grains of Ricinodendron heudelotii (Bail.) and Tetracarpidium conophorum (Müll. Arg) were first cooked in boiled water at their optimal cooking time for 90 and 30 min respectively. After defating, sieving of the defatted cakes showed that samples with a granulometry of 400 - 500 µm were most representative (more than 70%), containing more proteic nitrogen (6 7 %). Protein concentrates and protein isolates were prepared from defatted cakes respectively in distilled water at pH 4.5 and in NaOH 0.2% (R. heudelotii) and NaCl 0.6M (T. conophorum) at pH 11. Physico-chemical properties of protein concentrates (65 75 % of proteins) and protein isolates (81 92 % of proteins) were different from those of the defatted cakes. Water holding (367 467 g / 100 g of sample), oil holding (256 410 g / 100 g of sample) and foaming capacities (68 71 %) were highest with protein isolates whereas gelling (6 14 %) and emulsion capacities (63 87 %) were highest with concentrates. The amounts of essential amino acids in both defatted flours were comparable to the value in FAO / WHO (2007) scoring pattern. Nitrogen liberated after 6 h of enzymatic digestibility was more than 90 % both in the proteins concentrates and isolates. In vivo studies carried out on 21 ± 3 days old Sprague Dawley male rats for 15 days showed that gain of weight and nitrogen retention parameters were higher for rats that consumed casein and T. conophorum defatted cake. Corrected values of nitrogen digestibility of the analysed samples showed that T. conophorum defatted cake contains protein source with good nutritional quality
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Laurette Blandine Mezajoug Kenfack. Propriétés nutritionnelles et fonctionnelles des protéines de tourteaux, de concentrats et d'isolats de Ricinodendron heudelotii (Bail.) Pierre ex Pax et de Tetracarpidium conophorum (Müll. Arg.). Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL013N⟩. ⟨tel-01748823⟩

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