FTIRspectroscopy with chemometrics for determination of tylosin residues in milk

BACKGROUND Contamination of milk by antibiotic residues represents risks to the health of consumers; therefore they should be monitored. The objective of this study was to propose a methodology for the determination of tylosin residues directly in fluid milk based on mid-infrared spectroscopy associated with chemometrics, using attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy associated with multilayer perceptron network (MLP) and partial least squares (PLS). RESULTS MLP was shown to be adequate for the discrimination of milk samples contaminated with tylosin below or equal to or above the maximum residue limit (MRL), with an accuracy greater than 99%, using FTIR spectra data. PLS was shown to be appropriate for the prediction of the very low concentrations (0-100 mu g L-1) of tylosin residues in milk using FTIR spectra data. PLS models with high correlation coefficients (R > 0.99) were generated. CONCLUSION FTIR with chemometrics proved to be a non-destructive, efficient and low-cost method for the investigation and quantification of tylosin residues directly in fluid milk. (c) 2020 Society of Chemical Industry

Automated summary

The study demonstrates that the combination of ATR-FTIR spectroscopy with MLP and PLS algorithms is effective in identifying milk samples contaminated with tylosin and predicting very low concentrations of tylosin residues in milk. The FTIR with chemometrics proves to be a non-destructive, efficient, and low-cost method for analyzing tylosin residues in fluid milk.