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Sweet potato flour was produced after fermentation of two cultivars (TIS87/0087 and TIS 2532.OP.1.13) of sweet potato (Ipomoea batatas) roots for 24h. The microbiological profile, pH and titratable acidity (TA) of the fermenting medium were assessed. The proximate composition and shelf stability of the ambient stored flour samples were also determined. Bacteria isolated from the fermenting medium were Lactobacillus plantarum, Streptococcus spp, Bacillus spp and Staphylococcus aureus while the fungal isolates included Penicillium spp. Rhizopus stolonifer, Aspergillus niger and yeast Saccharomyces cerevisiae. The Total Viable Count of both cultivars during fermentation differed significantly (P<0.05) only at 0h of fermentation. However, for TIS 87/0087 it ranged from 3.40 – 4.60 log10 cfu g-1 and 3.54 to 4.64 log10 cfu g-1 for TIS 2532.OP.1.13 cultivar. The lactic acid bacteria counts ranged from 2.40 to 3.60 log10 cfu g-1 for cultivar TIS87/0087 and 2.54 to 3.64 log10 cfu g-1 for cultivar TIS 2532.OP.1.13. The TA for both cultivars were observed to have increased from 0.51% to 4.96% for TIS 87/0087 and 0.40% to 4.04% for TIS 2532.OP.1.13 as fermentation progressed in relation to fall in pH. The proximate composition of flours from TIS87/0087 and TIS 2532.OP.1.13 showed low moisture content (10.76% and 11.37%), high dry matter (89.24% and 88.66%), carbohydrate (81.25% and 81.01%), protein (5.16% and 5.09%), fiber (0.76% and 0.64%) and crude lipid (0.68% and 0.47%) respectively. However, the protein and crude lipid content of TIS 87/0087 flour were higher. The fermented flour had an acceptable microbial load limit (<5log10 cfu g-1) and shelf life stability for 3 months under ambient storage. The fermented TIS 87/0087 flour can be recommended for incorporation into instant food and bakery products.
This study is one of the few studies which have investigated the recent Sweet potato cultivars in Nigeria, but in this, using fermentation process to improve the nutritional and microbial quality of the flours. The study had shown that the fermented flours had high nutritional and low microbial qualities.
Physiological Effects of Some Artificial and Natural Food Coloring on Young Male Albino Rats
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Abdellah A. Dafallah , Abdelmonem M. Abdellah , Emam A. Abdel-Rahim , Sherif H. Ahmed (2015). Physiological Effects of Some Artificial and Natural Food Coloring on Young Male Albino Rats. Journal of Food Technology Research, 2(2): 21-32. DOI: 10.18488/journal.58/2015.2.2/220.127.116.11
Food colorants are widely added to food in order to attract the consumer. Recent researches have incriminated these additives for causing some problems to human health. This study was conducted to determinate the physiological effects of some natural (curcumin, carrotin and curcumin) and synthetic (tetrazine, sunset yellow and erythosine) food colorants on some hematological and biochemical parameters of male albino rats (rattus norvegicus, spraguedawlay strain). Results revealed that administration of synthetic food colorants decreased the percentage of high density lipoprotein cholesterol (HDL-C), glutathione secretion (GSH), superoxide dismutase (SoD), and plasma immune-system and significantly increased plasma lipid lipoprotein, total cholesterol (LDL-C), lipid peroxidase, blood glucose, plasma urea and creatinine and increased activities of alkaline phosphatase, acid phosphatase, and lactate dehydrogenase. Hence, it is recommended to avoid adding synthetic colorants as additive to foodstuff, while natural colorants seemed to be the best choice as food colorants.
This study is emphasizing the adverse effects of the synthetic food colorants on human health as previously reported in the literature.