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Assessment of Nutrient, Anti-Nutrient and Mycoflora Quality of Two Varieties of Cocoyam Sold in Port Harcourt

Wekhe E.O., 1Agbagwa S. S. and 1Shedrack J.O.

Abstract

Studies on the nutrient, antinutrient and associated mycoflora of two varieties of cocoyam (Xanthosoma sagififolium and Colocasia esculenta) corms were carried out in the Department of Plant Science and Biotechnology, Rivers State University. The method of Association of Official Analytical Chemists was adopted for determining proximate and antinutrient components of healthy cocoyam varieties while the cultural laboratory technique was adopted for the isolation of spoilage fungi associated with spoilt cocoyam. Nutrient analysis showed the presence of moisture, fibre, fat, ash, protein and carbohydrate in both varieties. However, higher contents in ash (2.08±0.00), fibre (0.72±0.01), fat (8.81±0.00), proteins (7.0±0.00) and carbohydrate (42.52±0.32) were recorded for C. esculenta while X. saggitafolium recorded higher moisture value (41.77±0.01). Antinutrient assessment showed that X. saggitifolium had higher concentration of flavonoid (34.56±0.01), phytate (33.00±0.00), phenol (20.32±0.01) oxalate (36.89±0.00) and steroid (25.65±0.01) respectively while C. esculenta recorded higher values for tannin (44.45±0.01) and flavonoid (23.31±0.00) respectively. Three fungal pathogens were isolated to be responsible with the spoilage of cocoyam corm; they include Aspergillus tamari, Aspergillus flavus and Aspergillus terreus. A. tamari, A. flavus and A. terreus were associated with X. saggittifolium at incidences of 80, 10 and 10% respectively. However, only A. tamarrii was isolated from C. esculenta at an incidence of 100%. In general, C. esculenta had more nutrient and less spoilage organisms than X. saggitifolium.

Keywords

Nutrientsantinutrientmycoflora and cocoyam.

References

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