Application of Raman spectroscopy for qualitative and quantitative analysis of aflatoxins in ground maize samples Academic Article uri icon

abstract

  • The applicability of Raman spectroscopy combined with chemometrics using different preprocessed spectra data was examined to develop fast, low-cost, and non-destructive spectroscopic methods for classification and quantification of aflatoxin-contaminated maize samples within the aflatoxin concentration range of 0-1206 g/kg. This technique will find useful application in evaluating large numbers (e.g. >2000) of samples from maize hybrid performance trials and breeding programs. The best discriminant models were obtained from the linear discriminant analysis (LDA). The LDA models on validation samples showed correct classification rates in the range of 94-100% and did not misclassify any aflatoxin contaminated samples as aflatoxin negative. Of the models for predicting aflatoxin concentration, the partial least squares regression (PLSR) models showed the best quality of regression (slopes of 0.939-0.990) and highest coefficient of determination (r2 = 0.941-0.957). The models provide limited applicability to quantify aflatoxin concentration below 20 g/kg. No significant difference was observed between predicted values using Raman spectroscopy and reference values using high-performance liquid chromatography (HPLC) (p > 0.05), indicating the suitability of Raman spectroscopy to rapidly screen large numbers of maize samples for aflatoxin contamination. 2013 Elsevier Ltd.

published proceedings

  • Journal of Cereal Science

author list (cited authors)

  • Lee, K., Herrman, T. J., & Yun, U.

citation count

  • 39

complete list of authors

  • Lee, Kyung-Min||Herrman, Timothy J||Yun, Unil

publication date

  • January 2014