“Interrogate” corn kernels under strobe lights and they may admit aloud that they’re harboring a toxin-producing fungus. Nowadays, Agricultural Research Service scientists with specially programmed computers find such confessions ring true with 96 percent accuracy.


At grain elevators, inspectors routinely check corn for the fungus Aspergillus flavus. It produces aflatoxin, a hazardous substance that poses health risks if it gets into food or livestock feed.


To check for the fungus, inspectors use a bright greenish yellow fluorescence (BGYF) test.Samples that glow under ultraviolet light are suspect and must undergo lab analysis. As another check, the latest cross-examination idea may fit into a system that would monitor corn on a conveyor belt and divert infected grain.


At the National Center for Agricultural Utilization Research, Peoria, Ill., the ARS scientists “interrogated” corn by using Fourier transform infrared photoacoustic spectroscopy (FTIR- PAS). In this process, pulses of infrared light bombard kernels inside a chamber. The resulting heat waves radiate from the corn, sending sound waves to a microphone. Sound, representing different infrared wavelengths, is recorded in a computer database. Infected corn sends out different levels of sound than non-infected corn

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