Evaluation of analytical methods and optimization of conditions for the determination of fumonisins B1 and B2 in corn
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Keywords

Mycotoxins
fumonisins
corn
high performance liquid chromatography

How to Cite

1.
Magda Camargos S, Machinski Junior M, M.Valente Soares L. Evaluation of analytical methods and optimization of conditions for the determination of fumonisins B1 and B2 in corn. Rev Inst Adolfo Lutz [Internet]. 1999 Dec. 30 [cited 2024 Jul. 22];58(2):71-9. Available from: https://periodicos.saude.sp.gov.br/RIAL/article/view/36696

Abstract

Extraction and clean up systems were evaluated for the determination of fumonisins in com. The best clean up was found in the method described by Sydenham et alii (1992). Recovery, nonetheless, was found to be bellow 50% for fumonisins B I and B2 (FB 1 and FB2). The method was modified and methanol/water (3+ I) was kept as the extraction solvent, the volumes of the anionic exchange column conditioning and washing solvents were increased to 10 mL and both the volume and the composition of the eluting solvent were altered to 20 mL methanol/acetic acid (95+5). After these modifications were introduced the method recovery was 95 to 96% for FB 1 and 69 to 72% for FB2. The eIution solvent for the HPLC with fIourescence detection step was also modified to acetonitrile/water/acetic acid (50+50+0,5) during the first 15 minutes followed by pure acetonitrile for the rest of the run. The conditions employed during the derivatization reaction of fumonsins with o-phtaldialdehyde (OPA) were also optimized to utilize 100 L sample extract and 200 L OPA solution at 5 - 15 T during 60 seconds. The new conditions improved the detection limits to 20 and 40 ng/g for FB 1 and FB2, respectively, and to an average standard deviation between duplicates of 0,6% for FB I and for FB2.

https://doi.org/10.53393/rial.1999.58.36696
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