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EFFICIENCY OF MILLET-DERIVED VERSUS COMMERCIAL YOGHURT CULTURES IN LACTOSE ELIMINATION

Lactase deficiency is present in up to 15 % of persons of northern European descent, up to 80 % of blacks and Latinos, and up to 100 % of American Indians and Asians. About 78% of Africans have lactose Intolerance and 58% in Ugandans. Probiotic yogurt, comprised of a Fiti sachet containing Lactobacillus rhamnosus GR-1 and Streptococcus thermophilus C106, has been used in the developing world, notably Africa, to alleviate malnutrition and disease. In sub-Saharan African countries, fermentation of cereals such as millet, is culturally significant. The aim of this study was to investigate milk fermentation capability of fermented finger millet extract when compared to commercially available yoghurt starter cultures. The objectives were: (i) to determine the time taken by the different yoghurt cultures to attain a pH of 4.5; (ii) to compare the efficiency of lactose fermentation of the locally made-culture and the commercial yoghurt cultures and (iii) to determine the shelf-life of yoghurt made by the different yoghurt cultures. The local culture was prepared from finger millet and the yoghurt samples were then made from the cultures. These yoghurt samples were the evaluated for shelf life tests, organoleptic tests and time taken for the attainment of a pH 4.5 in each of the cultures. Lactose content evaluation was carried out after a period of 24 hours for three days. Lactose reduced in all fermented products. After three days of observation, lactose content in yogurt made from fermented finger millet extract reduced to 1.4g/20mls compared to <0.5g/20mls in Danisco Yo-Mix and Hansen Yoflex commercial yoghurt starter cultures. Yoghurt produced from commercial starter cultures had the longest shelf life of up to three days compared to that from the fermented finger millet extract that lasted for only two days.

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Author: amoit scholastic
Contributed by: asbat digital library
Institution: makerere university
Level: university
Sublevel: under-graduate
Type: dissertations