The effect of preparing ＂donkwa＂ from a blend of tigernut and groundnut at different proportion （90：10, 80：20, 70：30 and 50：50 （tigernut：groundnut）） was evaluated on the proximate composition and sensory qu...The effect of preparing ＂donkwa＂ from a blend of tigernut and groundnut at different proportion （90：10, 80：20, 70：30 and 50：50 （tigernut：groundnut）） was evaluated on the proximate composition and sensory qualities. This was compared with a sample of ＂donkwa＂ prepared by the popular method from a blend of maize and groundnut. The results revealed the protein content range of 21.84%-23.67% with tigernut based ＂donkwa＂, while the protein content of maize based ＂donkwa＂ was 21.60% at 50：50 （maize：groundnut） ratio. The highest value was also recorded for fiber content with maize based ＂donkwa＂ （50：50） which was 3.63% with no significant difference from the value obtained from tigernut based ＂donkwa＂ at 90：10 （tigernut：groundnut） ratio which was 3.25%. The sensory qualities revealed that the tigernut based ＂donkwa＂ compared favourably with the maize based ＂donkwa＂ with indication that there was no significant difference in terms of colour among the samples. There was significant difference among the samples in terms of taste, texture, flavour and general acceptability with the maize based ＂donkwa＂ most preffered in terms texture and general acceptability. In conclusion, the results obtained show the possibility of preparing ＂donkwa＂ from tigernut to give a nutritious and highly acceptable product.展开更多
By formulating a breakfast meal from quinoa and tigernuts that is organically sweetened,this study aimed to synergistically utilize the natural bioactive compounds embedded in both foods.When compared to commercial sa...By formulating a breakfast meal from quinoa and tigernuts that is organically sweetened,this study aimed to synergistically utilize the natural bioactive compounds embedded in both foods.When compared to commercial sample,all formulations had higher protein and fat contents.The meals contained little starch,and most significantly,over 35%of this starch was non-digestible.The main minerals found in the meals were potassium(481.81—592.47 mg/100 g),phosphorus(231.75—257.20 mg/100 g),magnesium(152.34—176.29 mg/100 g),and calcium(257.45—266.61 mg/100 g,with the Na/K molar ratio<1.0 advantageous for those with high blood pressure.Regarding overall phenol and flavonoid contents,the meals outperformed the commercial product with remarkable antioxidant capacities when tested against different assays(FRAP,ABTS,and DPPH).The meals’inhibitory capacities on both carbohydrate-hydrolyzing enzymes were noticeably higher than that of the commercial product.Regardless of the amount of quinoa or tigernuts in each blend,the inhibitory performance was satisfactory(α-amylase 26.98—60.18%;α-glucosidase 19.47—40.02%).Similarly,the chemical properties of the meals as influenced by its higher protein,fats,dietary fibre,and low sugar,modulated its functional properties in a unique way.In terms of sensory assessment,the panelists ranked the meals similar and sometimes above the commercial ones with respect to all the organoleptic parameters considered.展开更多
Fermented tigernut milk (FTM) was prepared from three different varieties (fresh yellow, big and small dry brown) of tigernut (Cyperus esculenta) obtained from Bodija market, Ibadan, Oyo state. Fifty two microbial iso...Fermented tigernut milk (FTM) was prepared from three different varieties (fresh yellow, big and small dry brown) of tigernut (Cyperus esculenta) obtained from Bodija market, Ibadan, Oyo state. Fifty two microbial isolates were obtained from FTM at different fermentation times, 32 of which were on MRS agar, 12 on nutrient agar and 8 on malt extract agar. Lactic acid bacteria were identified as Lactobacillus plantarum (LP), Lactococcus lactis (LC), Lactobacillus brevis, Lactococcus cremoris, Lactobacillus bulgaricus and Lactococcus thermophilus (LT). The non-LAB identified includes E. coli, Bacillus species and Proteus species while the yeasts include Saccharomyces cerevisiae and Candida kefyr. Lactic acid bacteria were found to predominate the total microflora of the FTM with their count ranging between 2.0 × 104 cfu/ml to 2.0 × 108 cfu/ml. Microbiological examination revealed that the FTM was safe for consumption as non-LAB counts were below the limit of acceptance which is 2.0 × 105 cfu/ml for dairy milk by Codex Alimentarius Commission. The quantity of lactic acid produced by the LAB isolates ranged between 0.86 g/l - 2.86 g/l while that of hydrogen peroxide ranged between 0.16 g/l - 0.51 g/l. Starter cultures were selected based on predominance of isolate, physiological characteristics, quantity of lactic acid and hydrogen peroxide production. The tiger nut varieties were fermented with the following starter combinations LP, LP/LC, LP/LC/LT, LP/LT while the fifth was spontaneously fermented. The nutritional, chemical and sensory properties of the starter fermented tiger nut milk were evaluated. The highest protein content (24.80%) was obtained in FTM with mixed cultures of LP/LC/LT while the least (3.00%) was obtained in spontaneously fermented milk. There was a significant difference in the FTM varieties. The highest fat content (9.40%) was obtained in spontaneously fermented tiger nut milk while the least (3.40%) was found in FTM with mixed cultures of LP/LC/LT. Fermentation decreased the pH and increased the lactic acid of the starter developed FTM, while sensory evaluation test showed that the FTM with mixed cultures of LP/LC/LT was highly acceptable. In conclusion, an excellent and acceptable FTM can be produced using treatments which comprise of pasteurization at 90°?for 15 minutes, fermentation at 45℃?for 18 hours using mixed cultures of Lactobacillus plantarum, Lactococcus lactis and Lactococcus thermophilus.展开更多
The effects of starter fermentation on the nutritional qualities of maize-tigernut fortified weaning foods were investigated. The dry-milled, malted maize grains fortified with dry-milled roasted tigernut flours (70:3...The effects of starter fermentation on the nutritional qualities of maize-tigernut fortified weaning foods were investigated. The dry-milled, malted maize grains fortified with dry-milled roasted tigernut flours (70:30) were subjected to 48 hrs of spontaneous and starter fermentation (singly and as combined starters). Nutritional, sensory characteristics and feeding trials of the weaning foods were evaluated. Four fermented weaning blends were formulated: FMT (spontaneously fermented maize-tigernut), SFMT1 (Lactobacillus plantarum F2C fermented maize-tigernut), SFMT2 (Lactobacillus plantarum U2A fermented maize-tigernut) and SFMT3 (combined starter-fermented maize-tigernut). SFMT2 had the highest crude protein, fat, fibre, ash and least carbohydrate content among the blends. The highest energy content (456.84 Kcal/100 g) was observed in blend SMFT2 which was also higher than that of both negative (Nutrend) and positive (Conventional animal feed) controls. The least antinutrient and vitamin contents were recorded in SFMT2. Blend SFMT1 had the highest Vitamin B1 (0.67 mg/100 g), Vitamin A (472.60 ug/100 g), phosphorus (75.45 mg/100 g) and zinc (1.05 mg/100 g) contents while the highest calcium (17.17 mg/100 g) and iron (22.82 mg/100 g) were recorded in SFMT2. Sample SFMT2 was rated the highest in all of the sensory characteristics except colour and the highest overall acceptability (6.00) which was not different significantly from all other starter produce blends. Biological evaluation showed blend SFMT2 fed animals having the highest weight by 28 days (73.14 g), mean weight gain (5.46 g), mean feed intake (18.71 g) and mean protein efficiency ratio PER (3.65). However, all the PER values including that of controls (2.30) were higher than the value of 2.10 recommended by the Protein Advisory Group (PAG) for complementary foods. The RBC, WBC and PCV of the trial groups were within the rat hematologic reference ranges. Blend SFMT2 (L. plantarum U2A fermented blend) gave the best performance after rat feeding trials.展开更多
文摘The effect of preparing ＂donkwa＂ from a blend of tigernut and groundnut at different proportion （90：10, 80：20, 70：30 and 50：50 （tigernut：groundnut）） was evaluated on the proximate composition and sensory qualities. This was compared with a sample of ＂donkwa＂ prepared by the popular method from a blend of maize and groundnut. The results revealed the protein content range of 21.84%-23.67% with tigernut based ＂donkwa＂, while the protein content of maize based ＂donkwa＂ was 21.60% at 50：50 （maize：groundnut） ratio. The highest value was also recorded for fiber content with maize based ＂donkwa＂ （50：50） which was 3.63% with no significant difference from the value obtained from tigernut based ＂donkwa＂ at 90：10 （tigernut：groundnut） ratio which was 3.25%. The sensory qualities revealed that the tigernut based ＂donkwa＂ compared favourably with the maize based ＂donkwa＂ with indication that there was no significant difference in terms of colour among the samples. There was significant difference among the samples in terms of taste, texture, flavour and general acceptability with the maize based ＂donkwa＂ most preffered in terms texture and general acceptability. In conclusion, the results obtained show the possibility of preparing ＂donkwa＂ from tigernut to give a nutritious and highly acceptable product.
文摘By formulating a breakfast meal from quinoa and tigernuts that is organically sweetened,this study aimed to synergistically utilize the natural bioactive compounds embedded in both foods.When compared to commercial sample,all formulations had higher protein and fat contents.The meals contained little starch,and most significantly,over 35%of this starch was non-digestible.The main minerals found in the meals were potassium(481.81—592.47 mg/100 g),phosphorus(231.75—257.20 mg/100 g),magnesium(152.34—176.29 mg/100 g),and calcium(257.45—266.61 mg/100 g,with the Na/K molar ratio<1.0 advantageous for those with high blood pressure.Regarding overall phenol and flavonoid contents,the meals outperformed the commercial product with remarkable antioxidant capacities when tested against different assays(FRAP,ABTS,and DPPH).The meals’inhibitory capacities on both carbohydrate-hydrolyzing enzymes were noticeably higher than that of the commercial product.Regardless of the amount of quinoa or tigernuts in each blend,the inhibitory performance was satisfactory(α-amylase 26.98—60.18%;α-glucosidase 19.47—40.02%).Similarly,the chemical properties of the meals as influenced by its higher protein,fats,dietary fibre,and low sugar,modulated its functional properties in a unique way.In terms of sensory assessment,the panelists ranked the meals similar and sometimes above the commercial ones with respect to all the organoleptic parameters considered.
文摘Fermented tigernut milk (FTM) was prepared from three different varieties (fresh yellow, big and small dry brown) of tigernut (Cyperus esculenta) obtained from Bodija market, Ibadan, Oyo state. Fifty two microbial isolates were obtained from FTM at different fermentation times, 32 of which were on MRS agar, 12 on nutrient agar and 8 on malt extract agar. Lactic acid bacteria were identified as Lactobacillus plantarum (LP), Lactococcus lactis (LC), Lactobacillus brevis, Lactococcus cremoris, Lactobacillus bulgaricus and Lactococcus thermophilus (LT). The non-LAB identified includes E. coli, Bacillus species and Proteus species while the yeasts include Saccharomyces cerevisiae and Candida kefyr. Lactic acid bacteria were found to predominate the total microflora of the FTM with their count ranging between 2.0 × 104 cfu/ml to 2.0 × 108 cfu/ml. Microbiological examination revealed that the FTM was safe for consumption as non-LAB counts were below the limit of acceptance which is 2.0 × 105 cfu/ml for dairy milk by Codex Alimentarius Commission. The quantity of lactic acid produced by the LAB isolates ranged between 0.86 g/l - 2.86 g/l while that of hydrogen peroxide ranged between 0.16 g/l - 0.51 g/l. Starter cultures were selected based on predominance of isolate, physiological characteristics, quantity of lactic acid and hydrogen peroxide production. The tiger nut varieties were fermented with the following starter combinations LP, LP/LC, LP/LC/LT, LP/LT while the fifth was spontaneously fermented. The nutritional, chemical and sensory properties of the starter fermented tiger nut milk were evaluated. The highest protein content (24.80%) was obtained in FTM with mixed cultures of LP/LC/LT while the least (3.00%) was obtained in spontaneously fermented milk. There was a significant difference in the FTM varieties. The highest fat content (9.40%) was obtained in spontaneously fermented tiger nut milk while the least (3.40%) was found in FTM with mixed cultures of LP/LC/LT. Fermentation decreased the pH and increased the lactic acid of the starter developed FTM, while sensory evaluation test showed that the FTM with mixed cultures of LP/LC/LT was highly acceptable. In conclusion, an excellent and acceptable FTM can be produced using treatments which comprise of pasteurization at 90°?for 15 minutes, fermentation at 45℃?for 18 hours using mixed cultures of Lactobacillus plantarum, Lactococcus lactis and Lactococcus thermophilus.
文摘The effects of starter fermentation on the nutritional qualities of maize-tigernut fortified weaning foods were investigated. The dry-milled, malted maize grains fortified with dry-milled roasted tigernut flours (70:30) were subjected to 48 hrs of spontaneous and starter fermentation (singly and as combined starters). Nutritional, sensory characteristics and feeding trials of the weaning foods were evaluated. Four fermented weaning blends were formulated: FMT (spontaneously fermented maize-tigernut), SFMT1 (Lactobacillus plantarum F2C fermented maize-tigernut), SFMT2 (Lactobacillus plantarum U2A fermented maize-tigernut) and SFMT3 (combined starter-fermented maize-tigernut). SFMT2 had the highest crude protein, fat, fibre, ash and least carbohydrate content among the blends. The highest energy content (456.84 Kcal/100 g) was observed in blend SMFT2 which was also higher than that of both negative (Nutrend) and positive (Conventional animal feed) controls. The least antinutrient and vitamin contents were recorded in SFMT2. Blend SFMT1 had the highest Vitamin B1 (0.67 mg/100 g), Vitamin A (472.60 ug/100 g), phosphorus (75.45 mg/100 g) and zinc (1.05 mg/100 g) contents while the highest calcium (17.17 mg/100 g) and iron (22.82 mg/100 g) were recorded in SFMT2. Sample SFMT2 was rated the highest in all of the sensory characteristics except colour and the highest overall acceptability (6.00) which was not different significantly from all other starter produce blends. Biological evaluation showed blend SFMT2 fed animals having the highest weight by 28 days (73.14 g), mean weight gain (5.46 g), mean feed intake (18.71 g) and mean protein efficiency ratio PER (3.65). However, all the PER values including that of controls (2.30) were higher than the value of 2.10 recommended by the Protein Advisory Group (PAG) for complementary foods. The RBC, WBC and PCV of the trial groups were within the rat hematologic reference ranges. Blend SFMT2 (L. plantarum U2A fermented blend) gave the best performance after rat feeding trials.
