Abstract
Flunixin (usually formulated as flunixin meglumine (FLN)), a common non-steroidal anti-inflammatory drug (NSAID) given to cattle, raises human health concerns when it is present in milk. Maximum residue limit (MRL) of 10 µg/kg has been set by Food Safety and Standards Authority of India (FSSAI) for FLN residues in milk. Attenuated Total Reflectance- Fourier-Transform Mid-Infrared (FT-MIR) spectroscopy in conjunction with multivariate techniques was applied to detect the presence of FLN residues in milk. Samples of FLN, pure milk as well as milk samples spiked with FLN at concentrations (1, 5, 10, 20 and 50 µg/kg) below and above the MRL were analysed. ATR-FTIR measurements were conducted in the 4000 –400 cm− 1 wavenumber range, and the wavenumber regions (2942 − 2838, 1748 − 1734 and 1149 –1012 cm− 1) were selected based on the maximum variability in the intensity of peaks and chemometrics techniques such as Principal Component Regression (PCR), Partial Least Square Regression (PLSR), Principal Component Analysis (PCA) and Soft Independent Modeling of Class Analogy (SIMCA) were applied. The study concluded that the presence of parent drug- FLN residues in milk even at 1 µg/kg level (below MRL prescribed by regulatory bodies) can be detected using ATR-FT-MIR coupled with chemometrics.
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Abbreviations
- FLN:
-
Flunixin meglumine
- ATR:
-
FTIR- Attenuated Total Reflectance- Fourier Transform Infrared
- NSAID:
-
Non-Steroidal Anti-Inflammatory Drug
- MIR:
-
Mid-Infrared
- FSSAI:
-
Food Safety and Standards Authority of India
- MRL:
-
Maximum Residue Limit
- LOD:
-
Limit of Detection
- LCMS:
-
Liquid Chromatography Mass Spectrometry
- LC-MS/MS:
-
Liquid Chromatography Tandem Mass Spectrometry
- HPLC:
-
High Performance Liquid Chromatography
- LFIA:
-
Lateral Flow Immunoassay
- R2 :
-
Coefficient of Determination
- PC:
-
Principal Component
- PCA:
-
Principal Component Analysis
- PCR:
-
Principal Component Regression
- PLSR:
-
Partial Least Squares Regression
- RMSE:
-
Root Mean Square Error
- SIMCA:
-
Soft Independent Modeling of Class Analogy
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Acknowledgements
The first author acknowledges the financial support in the form of fellowship which was awarded by Department of Science and Technology- Innovation in Science Pursuit for Inspired Research, New Delhi (Fellow registration No. IF220211). The authors also acknowledge ICAR-National Dairy Research Institute, Karnal for providing the facilities.
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Rakendhu Saji: Sample preparation and analysis, data analysis, writing original draft. Kamal Gandhi: Conceptualization, Interpretation of spectral peaks, review. Rajan Sharma: Development of models, review and editing. Rajesh Bajaj: Supervision, review and editing. Bimlesh Mann: Supervision, review and editing. Akshay Ramani: Data analysis, review and editing.
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Saji, R., Gandhi, K., Sharma, R. et al. Detection of flunixin residues in milk using ATR- FTIR spectroscopy coupled with chemometrics. Food Measure (2024). https://doi.org/10.1007/s11694-024-02686-5
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DOI: https://doi.org/10.1007/s11694-024-02686-5