Method and detection system for detection of aflatoxin in corn with fluorescence spectra

摘要

A system and method for fluorescence spectral imaging of target material to detect the presence of a contaminant (such as aflatoxin in corn) is provided. An ultraviolet light source is coupled a light-excluding compartment. The fluorescence from the UV excited target passes through a filter (liquid crystal tunable, acoustic-optic tunable, a filter wheel, or other wavelength splitting device) and a lens, to a spectral imaging camera. Fluorescence spectral image data from the camera is analyzed by a computer and presented in human-readable form. Aflatoxin detection in contaminated corn kernels is based on peak fluorescence and peak fluorescence shift in the spectral range from 451 nm to 500 nm. Aflatoxin contamination level within the target material is quantified based on peak fluorescence and peak fluorescence shift and computed corn kernel pixel statistics.