Influence of particle size distribution of orange-fleshed sweet potato flour on dough rheology and simulated gastrointestinal digestion of sweet potato-wheat bread

Aims: The aim was to produce of ready-to-eat breakfast cereals from blends of local rice (Oryza sativa), malted African yam-bean and orange- fleshed sweet potato [Ipomoea batatas (L) Lam.] (umusco/3 variety) flours as well as to evaluate the nutritional properties, microbiological quality and sensory attribute of the formulated breakfast cereals. Study Design: The experimental design that was used is Completely Randomized Design. Place and Duration of Study: The study took place at the Department of Food Science and Technology, University of Nigeria, Nsukka between December 2016 and September 2017. Methodology: The study investigated the application of local rice, malted African yam bean and orange-fleshed sweet potato flour to develop ready-to-eat breakfast cereals rich in proteins and pro-vitamin A. The local rice and malted African yam bean flours were blended in the ratio of 100:0, 90:10, 80:20, 70:30, 60:40 and 50:50 to produce ready-to eat breakfast cereals which was subjected to sensory evaluation to isolate the best blend (90:10). From the preliminary study, composite flour was formulated by mixing rice flour and African yam bean flour from the best blend in different percentages. Samples of ready-to-eat breakfast cereals were formulated by mixing composite flour (rice and African yam bean best flour blend) with graded levels of orange fleshed sweet potato and 100% rice flour was used as the control sample. The breakfast cereal products were subjected to proximate, pro-vitamin A, microbiological and sensory analysis using standard methods. Results: The protein, ash, fiber and moisture contents of the blends (rice/African yam bean best blend +orange-fleshed sweet potato flours) were significantly (p<0.05) higher than the control but their carbohydrate content were lower than the control. The protein content, fat, ash, crude fiber, moisture, and carbohydrate contents ranged from 6.82(100% rice flour) to 11.21%(90% rice/African yam bean best blend+ 10% orange-fleshed sweet potato flour), 0.20(50% rice/African yam bean best blend+ 50% orange-fleshed sweet potato flour) to 1.21%(90% rice/African yam bean best blend+ 10% orange-fleshed sweet potato flour), 4.03(100% rice flour) to 15.81% (50% rice/African yam bean best blend+ 50% orange-fleshed sweet potato flour), 1.31(100% rice flour) to 2.80% (50% rice/African yam bean best blend+ 50% orange-fleshed sweet potato flour), 6.61(100% rice flour) to 10.92% (50% rice/African yam bean best blend+ 50% orange-fleshed sweet potato flour) and 63.07(50% rice/African yam bean best blend+ 50% orange-fleshed sweet potato flour) to 80.22% (100% rice flour) respectively. The pro-vitamin content of the samples ranged from 0.13 (100% rice flour) to 2.55 mg/100 g (50% rice/African yam bean best blend+ 50% orange-fleshed sweet potato flour). There was an increase in the pro-vitamin A content as the ratio of orange-fleshed sweet potato increased in the blend. The total viable count ranged from 3.0 × 103 to 6.7 × 103cfu/g while mould was not detected in any of the samples. The microbial content of the samples were satisfactory and not high when assessed using the guideline for microbiological quality of cereal products. The sensory evaluation conducted showed that among the six ready-to-eat breakfast cereals, 100% adani rice breakfast cereals, samples RAYBF1+OPF1 and RAYBF5+OPF5 were highly accepted. Conclusion: The study has shown that acceptable ready-to-eat breakfast cereals could be produced from blends of Adani rice, malted African yam bean and orange flesh sweet potato flour. Among the different breakfast cereals, 100% adani rice and sample RAYBF1+OPF1 (90 % best blend + 10% orange flesh sweet potato flour) were highly accepted.

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Physico-chemical and Sensory Properties of Bread Prepared from Wheat and Orange-Fleshed Sweet Potato (Flour, Starch and Non-Starch Residue Flour) Blends

Asian Food Science Journal ◽

10.9734/afsj/2021/v20i330274 ◽

2021 ◽

pp. 1-17

Author(s):

O. A. Kure ◽

C. C. Ariahu ◽

B. D. Igbabul

Keyword(s):

Physical Properties ◽

Sweet Potato ◽

Wheat Flour ◽

Ipomoea Batatas ◽

Loaf Volume ◽

Potato Flour ◽

Sweet Potatoes ◽

Sweet Potato Flour ◽

Orange Fleshed Sweet Potato ◽

Orange Fleshed Sweet Potatoes

Bread was produced from wheat (Trititum spp) orange flesh sweet potato (Ipomoea batatas L.) flour, starch and non-starch residue blends. The orange-fleshed sweet potatoes were washed, peeled, sliced, dried and milled to flour. The starch and non-starch residue were also produced from the orange-fleshed sweet potatoes. Different proportions of wheat and flour, wheat and starch and wheat and non-starch residue of orange-fleshed sweet potato with increasing level of orange-fleshed sweet potato at 10, 20, 30 and 40% addition in wheat were prepared. Control samples were 100% wheat flour (A0), 100% orange-fleshed sweet potato flour (A1), 100% orange-fleshed sweet potato starch (B1) and 100% orange-fleshed sweet potato non-starch residue (C1). Breads from these different proportions were formulated. The proximate, mineral, vitamin, physical properties and sensory attributes of the bread samples and their composites were determined. The GENSTAT Statistical Software (version 17.0) was used for data analyses. The Proximate compositions of the bread ranges as follows; moisture 26.30-36.21%, protein 0.85-7.89%, fat 6.33-8.93%, fiber 0.82-4.92%, ash 0.56-2.11% and carbohydrates 41.26-64.84%. The physical properties of the breads ranged from 210.60-254.00 g, 0.05-2.40 mm, 317.60-440.60 cm3 and 1.25-2.10 for loaf weight, oven spring, loaf volume and specific volume respectively. Mineral and vitamin composition for breads samples ranged respectively thus for calcium 18.45-33.21 zinc 0.92-6.27, magnesium 0.28-19.33, phosphorus 31.00-319.60 and potassium 56.30-352.60, vitamin B1, 0.10-0.37, vitamin B2, 0.07-1.23, vitamin B6, 0.09-1.25, vitamin B12 0.04-1.13 mg/100 g, vitamin C 0.12-14.17 mg/100 g and vitamin A 0.00-8193 µg/100 g.The sensory evaluation results indicated that up to 20% substitution of wheat flour with orange-fleshed sweet potato flour, starch and non-starch residue flours was acceptable in bread formulation.

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PENGARUH SUBSTITUSI TEPUNG TERIGU DENGAN TEPUNG TEMPE DAN TEPUNG UBI JALAR KUNING TERHADAP KADAR PROTEIN, KADAR Β-KAROTEN, DAN MUTU ORGANOLEPTIK ROTI MANIS

Journal of Nutrition College ◽

10.14710/jnc.v1i1.511 ◽

2012 ◽

Vol 1 (1) ◽

pp. 344-351

Author(s):

Kurniawati Kurniawati ◽

Fitriyono Ayustaningwarno

Keyword(s):

Protein Content ◽

Sweet Potato ◽

High Protein ◽

Wilcoxon Test ◽

Potato Flour ◽

Carotene Content ◽

Organoleptic Quality ◽

Sweet Potato Flour ◽

Orange Fleshed Sweet Potato ◽

Β Carotene

Background: Increased of high protein and β-carotene food consumption is expected may prevent PEM and VAD. Tempeh is a high-protein food stuff, while orange-fleshed sweet potato had high β-carotene content. Sweet bread with substitution of tempeh and orange-fleshed sweet potato flours is expected could be an alternative food which had high protein and β-carotene content. Objective: Analyze the effect of tempeh and orange-fleshed sweet potato flour substitution on protein and β-carotene content, and organoleptic quality of sweet bread. Method: An one factor completely randomized experimental study used 5 level of tempeh and orange-fleshed sweet potato flour substitution, which were 0%:0%, 0%:25%, 10%:15%, 15%:10%, and 25%:0%. Statistical analysis of protein and β-carotene content used One Way ANOVA followed by Tukey and Duncan test, while analysis of organoleptic quality used Friedman and Wilcoxon test. Result: Sweet bread with 25% tempeh flour substitution had the highest protein content (14.38%) and 25% orange-fleshed sweet potato flour substitution had the highest β-carotene content (0.24 mg/100 g). Substitution of 25% orange-fleshed sweet potato flour and substitution of 10% tempeh -15% orange-fleshed sweet potato flour had significant effect on β-carotene content. Tempeh and orange-fleshed sweet potato flour substitution also had significant effect on color, aroma, texture, and taste of sweet bread, but had no but had no significant effect on its protein content. Conclusion: Tempeh flour substitution increased protein content in sweet bread and orange-fleshed sweet potato flour increased its β-carotene content. Sweet bread with 10% tempeh-15% orange-fleshed sweet potato flour substitution were recommended.

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