期刊名称：Journal of Applied & Environmental Microbiology
印刷版ISSN：2373-6747
电子版ISSN：2373-6712
出版年度：2016
卷号：4
期号：3
页码：55-62
DOI：10.12691/jaem-4-3-2
出版社：Science and Education Publishing
摘要：Sweet potato (Ipomoea batatas L.) is one of the major root and tuber crops of the tropics which can be achieved under a wide range of agro-climates and farming systems. The study was undertaken to determine aflatoxins and fumonisins occurrence in sun-dried sweet potato chips sampled from households in Kahama district in Shinyanga region, Tanzania. A total of 80 sun - dried sweet potato samples were evaluated for aflatoxins (AFB1, AFB2, 1 and 2) and fumonisins (FB1 and FB2) contaminations. High-performance liquid chromatography (HPLC) with fluorescence detectionmethod was used for analysis. The overall percentage of samples which tested positive for aflatoxins was 36% with contamination in ranges from 10.49 µg/kg) to 75.12 µg/kg. The aflatoxin B1 (AFBI) contamination was the most prevalent with concentration of 21.23 μg/kg followed by aflatoxin G1 (AFGI) with concentration of 10.38 μg/kg. Fumonisin B1 (FB1) was the only type of fumonisin detected and had 97.5% of samples contaminated with values ranging from 29.34 – 628.78 mg/kg (mean 44.69 mg/kg). Fumonisin B1 was found to be significantly (p < 0.01) correlated with moisture content. The study has revealed that samples had aflatoxins and fumonisins contamination levels above acceptable levels by East Africa standards and Codex Alimentarius Commission, a joint FAO/WHO Food Standards Program. Efforts in improving post-harvest methods by addressing handling and processing methods is of prime importance in order to minimize risk of aflatoxins and fumonisins contamination of sweet potato chips.
