Cassava Case Study

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Toxicity problem is another factor that affecting nutritive value of cassava leaves (Tontisirin et al 2002). The variability observed in chemical components of cassava and its by-products in this study agreed with the report of Chaves et al. (2005) that there is much variation in the nutrient quality of the cassava root, leave and peel. The higher variability noticed in crude fiber, ether extract and ash for cassava root, leaf and peel could be due to resultant effect of soil nutrient and other components. According to Gil and Buitrago, (2002),fiber content differ according to variety and stage of development and the starch decreases in cassava root as the fiber content increases. This level of ash content gives an indication of total mineral …show more content…

It is possible that most of these amino acids are affected by factors that cause variability in nutrient composition of cassava by-product. Moreover, humidity when drying the material is another factor that interferes with protein determination as excessive drying of the root powder may alter nutrient drastically. Hence, the protein content of root crops is influenced by variety, cultivation practice, climate, soil nutrient, growing season and location (Woolfe, 1987). The observed strong positive correlation between ash and ether extract in root, ether extract and crude fiber might be due to changes in ash content due to environmental problem. It is well known that ash content is highly dependent on the soil and area of plantation (Siti sarah and Aisha, 2015). Reversible correlation obtained in NFE and ether extract, NDF and NFE, NFE and ash, ash and CP may be due to different analytical tools used and wider variation in chemical content as a result of different factors. The revealed strong positive correlation between ether extract and crude protein might be due to varietal issue. The fat content of cassava is determined by age of plant when harvested, variety and environmental factors. For cassava root, r2 for predicting individual AA from CP content was generally low and was greater than 20% only for TAA and valine. Also, r2 for predicting individual AA from leaf was 25% for TAA while that of peel was above 70% for histidine and threonine. Weak relationship observed among the CP, TAA and TIAA in this study might be due to their percentage proportion and changes in protein level as a result of development stage and environment (Howelar,

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