New analytical techniques for mycotoxins in complex organic matrices. [Aflatoxins B1, B2, G1, and G2]
Air samples are collected for analysis from the Ames Solid Waste Recovery System. The high level of airborne fungi within the processing area is of concern due to the possible presence of toxic mycotoxins, and carcinogenic fungal metabolites. An analytical method has been developed to determine the concentration of aflatoxins B1, B2, G1, and G2 in the air of the plant which produces Refuse Derived Fuel (RDF). After extraction with methanol, some components in the matrix are precipitated by dissolving the sample in 30% acetonitrile/chloroform. An aliquot of this solution is injected onto a Styragel column where the sample components undergo simultaneous size exclusion and reverse phase partitioning. Additional studies have provided a more thorough understanding of solvent related non-exclusion effects on size exclusion gels. The Styragel column appears to have a useable lifetime of more than six months. After elution from Styragel, the sample is diverted to a second column containing Florisil which has been modified with oxalic acid and deactivated with water. Aflatoxins are eluted with 5% water/acetone. After removal of this solvent, the sample is dissolved in 150 ..mu..L of a spotting solvent and the entire sample applied to a thin layer chromatography (TLC) plate using a unique sample applicator developed here. The aflatoxins on the TLC plate are analyzed by laser fluorescence. A detection limit of 10 pg is possible for aflatoxin standards using a nitrogen laser as the excitation source. Sample concentrations are determined by comparing with an internal standard, a specially synthesized aflatoxin derivative. In two separate RDF samples, aflatoxin B1 was found at levels of 6.5 and 17.0 ppB. The analytical method has also proven useful in the analysis of contaminated corn and peanut meal samples. 42 figures, 8 tables.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6647164
- Report Number(s):
- IS-T-1023; ON: DE83004965
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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54 ENVIRONMENTAL SCIENCES
ACETONITRILE
AEROSOL MONITORING
AEROSOLS
AFLATOXIN
ALCOHOLS
CEREALS
CHEMICAL ANALYSIS
CHLORINATED ALIPHATIC HYDROCARBONS
CHLOROFORM
CHROMATOGRAPHY
COLLOIDS
DATA
DISPERSIONS
EMISSION SPECTROSCOPY
EXPERIMENTAL DATA
EXTRACTION
EXTRACTION CHROMATOGRAPHY
FLUORESCENCE SPECTROSCOPY
GRAMINEAE
GRASS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROXY COMPOUNDS
INDUSTRIAL PLANTS
INFORMATION
LASERS
MAIZE
METHANOL
MONITORING
NITRILES
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PEANUTS
PLANTS
QUANTITATIVE CHEMICAL ANALYSIS
SEEDS
SEPARATION PROCESSES
SOLS
SOLVENT EXTRACTION
SPECTROSCOPY
THIN-LAYER CHROMATOGRAPHY
WASTE PROCESSING PLANTS