Comparative Assessment of the Nutritional Value of Commercially Available Cocoyam and Potato Tubers in South Africa

Lewu, Muinat Nike; Adebola, PO; Afolayan, A. J.

doi:10.1111/j.1745-4557.2010.00325.x

Cited by 40 publications

(59 citation statements)

References 24 publications

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“…The low moisture content for Treatment 1 on Magogoya variety and Treatment 3 on Ghana Variety is important as it enables long storage by minimizing fungal contamination and spoilage on cocoyam and also during transportation to the markets. The percentage ash content fall within the range reported in the literature, (Lewu et al, 2010) which is between 1 -5%. The ash content of Ghana variety was however lower than the other two local varieties.…”

Section: Discussionsupporting

confidence: 85%

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2017

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Cocoyam is one of the important root food crops especially in Eastern parts of Zimbabwe. However, the nutritional composition of the Zimbabwean cocoyam has not been ascertained. A field trial was conducted in Rusape, Makoni District, Manicaland Province, Thandi Area under Chief Makoni in Maramwidze Village, 10km from Rusape town in 2015/16 season. Treatments consists of the control, cowdung manure, inorganic fertilizer, and a combination of cowdung manure and inorganic fertilizer, and was laid out in a split-plot design with cocoyam types (Madhumbe, Magogoya and Ghana) assigned to the main plots and manure type as the sub-plots with three replications. The results showed that nutrient supply to the cocoyam crop influenced the quality of the crop in a non-synchronously form. Proximate nutrition composition of cocoyam were in the range of 65 -78% (moisture), 2 -5 % (ash), 0.2 -1.10% (fat), 2 -5% (fibre), 14 -23% (carbohydrates), 390 -460 mg/100g (potassium), 24 -43 mg/100g (calcium), 79 -91 k/cal (energy), 0.3 -4.8% (protein) and 79 -110 mg/100g (magnesium). The high carbohydrate content in the cocoyam shows that the crop is superior compared to other tubers like sweet potatoes and cassava. In conclusion, the utilization of cocoyam combined with other foods with high protein content like cowpea will be beneficial to the nutrition of vulnerable groups considering the resultant high nutritive values. Contribution/ OriginalityThe current study ascertained the nutritional composition of the Zimbabwean cocoyam. The study also shows that cocoyam is superior as compared to other tubers like sweet potatoes and cassava.

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Section: Discussionsupporting

confidence: 85%

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2017

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“…This result is supported by a previous study [45] in that, boiling of cocoyam tubers increase the bioavailability of Fe.…”

Section: Mineral Profilesupporting

confidence: 90%

Studies on Nutritional Profile and Antioxidant Potential of Different Dioscorea Sp With Plectranthus Rotundifolius

Joy¹,

Siddhuraju

2017

Int J Curr Pharm Sci

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Objective: Protection from oxidative damage to the tissues is provided by natural or synthetic antioxidants. Because of the multiple mechanisms of actions and presence of various phytochemicals, plant-based antioxidants are preferred. Dioscorea is well known as a traditional edible tuber. The present study was undertaken to explore and highlights the nutritional benefits and to evaluate the in vitro antioxidant and free radical scavenging capacity of ethanolic extract of three different underutilised Dioscorea species (D. alata, D. pentaphylla and D. oppositifolia) with a common cultivated crop, Plectranthus rotundifolius.Methods: Different processing methods are adopted to assess their influence on nutritive value and antioxidant properties. Tubers were studied for proximate composition using standard analytical methods. Mineral elements were analysed using ICP-MS (Inductively Coupled Plasma-Mass Spectrometer). Antioxidant potential of raw and processed samples was determined using a range of in vitro models. Results:The presence of essential minerals such as Na, K, Ca, P, Zn and Mn were observed. High radical scavenging activity was observed in the tubers of Dioscorea. Results indicated that phenolic compounds are the significant contributors to the antioxidant activity. Conclusion:Current study suggests that Dioscorea might be a promising natural antioxidant and could be very useful health food, as they enhance the antioxidant defence system. It also proposes that underutilized tubers can efficiently contribute to the nutritional requirement and food security.

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“…() and Lewu et al. (). The carbohydrate content showed that sample A had the highest value of 86.25 ± 0.17% followed by sample B (85.65 ± 0.12%).…”

Section: Resultsmentioning

confidence: 99%

Nutritional composition of “gari” analog produced from cassava (Manihot esculenta) and cocoyam (Colocasia esculenta) tuber

Bamidele

Ogundele

Ojubanire

et al. 2014

Food Science & Nutrition

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Physicochemical properties ofgari analog produced from coprocessing of Cassava (Manihot esculenta Crantz) and Cocoyam (Colocasia esculenta) were investigated. Cassava tuber and cocoyam were coprocessed at different percentages before frying separately. Proximate composition, mineral content, antinutritional factors, and sensory evaluation of various samples were determined. The results showed that the moisture content of all the samples was in the same range (7.28 ± 0.30 to 7.78 ± 0.14%). The protein content (1.57 ± 0.14 to 4.43 ± 0.16), ash (1.89 ± 0.10 to 2.15 ± 0.30), and crude fiber (1.53 ± 0.50 to 2.19 ± 0.10%) showed a significant increase with increase in the level of cocoyam substitution. The fat and carbohydrate content decreased with an increase in cocoyam level. The mineral contents of the samples increased with an increase in cocoyam content with sample F having the highest value of potassium, followed by samples E and D (68 mg/100 g, 35 mg/100 g, and 24 mg/100 g). The antinutritional factors of all the samples were at very low concentration while samples B, C, and D competed favorably with sample A (control) in sensory evaluation. In conclusion, coprocessing of cassava and cocoyam improved the nutritional quality of thegari produced with high level of acceptance from the taste panelist.

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Comparative Assessment of the Nutritional Value of Commercially Available Cocoyam and Potato Tubers in South Africa

Cited by 40 publications

References 24 publications

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Studies on Nutritional Profile and Antioxidant Potential of Different Dioscorea Sp With Plectranthus Rotundifolius

Nutritional composition of “gari” analog produced from cassava (Manihot esculenta) and cocoyam (Colocasia esculenta) tuber

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