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Comparative Detection of Fumonisin by HPLC, ELISA, and Immunocytochemical Localization in Fusarium Cultures

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Fumonisins are a group of mycotoxins that are elaborated by Fusarium moniliforme and Fusarium proliferatum and that have recently been associated with animal and human disease. In this study, the time course of fumonisin B1 (FB1) production in corn was monitored in five Fusarium cultures using high-performance liquid chromatography (HPLC), enzyme-linked immunosorbent assay (ELISA), and in situ localization by an enzyme-linked immunocytochemical technique (ELICT). Using HPLC on culture extracts prepared with 50% (vol/vol) acetonitrile in water, FB1 was detectable at 3 days with maximal FB1 (ranging from 230 to 3,000 ppm) occurring between 14 and 28 days. Although there was a positive correlation between FB1 detected by HPLC and ELISA, the latter consistently yielded higher results than HPLC. Maximal FB1 "equivalents" detected by ELISA ranged from 12,000 to 35,000 ppm. Following fixation of Fusarium from cultures, ELICT revealed the presence of large deposits indicative of fumonisin or fumonisin-like cross-reacting compounds in mycelia, microconidia, and microconidia. Prior to fixation, these compounds were extractable in 50% (vol/vol) acetonitrile in water. ELICT results qualitatively correlated with HPLC and ELISA over the time course of the cultures. Taken together, the results suggest that (a) ELISA or ELICT could be used for qualitative screening of FB1-producing cultures, and (b) in addition to FB1, the monoclonal antibody-based ELISA detected one or more compounds that structurally resemble FB1 and occur concurrently with FB1.


Document Type: Research Article

Affiliations: 1: Department of Food Science and Human Nutrition, 234 Food Science G Malcolm Trout Building, Michigan State University, East Lansing, MI 48824-1224 2: Department of Biological Sciences, University of Zimbabwe, P.O. Box M P 167, Mount Pleasant, Harare, Zimbabwe.

Publication date: June 1, 1995

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