Browsing by Author "Mongi, R."

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    Development and sensory evaluation of yoghurt flavoured with solar dried fruits
    (Pearl Research Journals, 2017) Mumba, F.G.; Ngowi, H.; Chove, L.; Mongi, R.; Abdulsud, I.; Ndabikunze, B. K
    A study of developing solar dried fruit (5%) flavoured yoghurts using three types of fruits was conducted to determine acceptability and shelf life of developed products. A total of six samples namely banana, mango, pineapple, banana/mango, banana/pineapple and mango/pineapple were used as flavours in yoghurts. They were added either as fruit pieces or as powders. Shelf life projection study suggested that developed yoghurt products could be stored for up to 21 days at 4 °C without undergoing spoilage. Plain yoghourt (control) was the most liked sample and scored highest mean values for all attributes, which was significantly different from all other samples (p<0.05). Among the fruit flavoured yoghourts, mango was the most preferred sample in terms of flavor, aroma and general acceptability whereas the pineapple was the least acceptable. Although yoghurts flavoured with fruits pieces scored higher mean values in all sensory attributes than yoghurts flavoured with powdered fruits, no significant differences (p>0.05) between the two forms of fruit flavours was found. This needs to be further investigated. Thus, although the control was the most liked sample, solar dried fruit can be successfully used as yoghurt flavour, which may improve the texture and nutritional quality of the formulated yoghurts, making them available throughout the year, hence increasing farmer’s income.
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    Heavy Metal Contamination in Cocoyam Crops and Soils in Countries around the Lake Victoria Basin (Tanzania, Uganda and Kenya)
    (Sokoine University of Agriculture, 2022) Mongi, R.; Chove, L.
    A study to determine heavy metals concentration and their correlation between soil and cocoyam crops grown at different wetland locations in Tanzania, Kenya and Uganda around Lake Victoria basin was done. A total of 48 cocoyams and 48 soil samples (taken at 0-15 cm deep) were collected in triplicate from various locations in three districts in each country. They were analysed for Mercury (Hg), Arsenic (As), Lead (Pb), Chromium (Cr) and Copper (Cu) concentrations using atomic absorption spectrophotometry (AAS). The mean heavy metals concentration in cocoyam samples were above maximum permissible limits of 0.1 mg/kg for Hg, As and Pb and 5 mg/kg for Cu established by FAO/WHO (1995) and EU (2004; 2006) rendering them unsafe for human consumption. Heavy metals concentrations in soils were higher than in cocoyam samples in all locations in all countries. As and Cr concentrations however, were below the maximum permissible limits of 20 and 75 mg/kg respectively, in all countries. Heavy metals variation occurred both within and among countries, with Kampala, Uganda having significantly (p<0.05) higher values than other locations and countries, respectively. With exception of Pb in Uganda, insignificant correlation (p>0.05) between soil and the corresponding cocoyam crops grown was observed for other metals. Soil and cocoyam crops grown in the selected locations along the wetlands of Lake Victoria basin are contaminated with heavy metals and thus pose health risk to the consumers.
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    Sensory properties and consumer acceptability of nutrient dense porridge from locally available foods for infants in Tanzania.
    (Regional Universities Forum for Capacity Building in Agriculture, 2016) Marcel, M.; Turyashemererwa, F.; Mukisa, I.; Mongi, R.
    Childhood under nutrition during the first two years of life has been associated with irreversible harm and is linked to higher rates of morbidity, mortality, impaired cognitive ability and poor school performance in children. Low nutrient dense complementary foods are amongst the main causes of childhood malnutrition in developing countries. Thus, the use of locally available nutrient dense foods to improve infants’ nutrition is of considerable importance. A study to develop and assess sensory properties and consumer acceptability of nutrient dense porridge form locally available foods for infants in Tanzania was carried out in Morogoro region. Five formulations each containing soybeans, amaranth grains, pumpkin seeds and orange fleshed sweet potatoes (SAPO1-SAPO5) at different ratios were developed. The five developed formulations and two control samples were subjected to quantitative descriptive analysis (QDA) and consumer acceptability tests. With exception of oiliness, significant differences (p≤0.05) were observed between samples tested for all attributes. The formulated samples had significantly higher mean intensity scores of 5.4± 1.67-5.6±1.67 for aroma, 5.1 ±1.46 -7.0 ±1.44 for hue, 5.3±1.75 - 5.6±1.63 for sweetness and 4.2±1.85-4.6±1.98 for oiliness than control samples. Control samples had higher texture values than formulated samples. Consumer groups showed different acceptability for control and formulations. Mothers’ preffered control samples to formulations contrary to students who preferred formulated samples to control samples. Furthermore, all formulations had higher scores in aroma, sweetness and oiliness compared to control groups, thickness and grittiness were higher in control groups than formulations, while SAPO 3, 4 and 5 had higher scores of color hue than other samples. SAPO5 was the most accepted formulation by both mothers and students. This suggests that its ingredients ratio produced a most accepted product and hence it can be recommended for adoption.