LIBS: A Quality Control Tool for Food Supplements |
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Authors: | Rahul Agrawal Rohit Kumar Shikha Rai Ashok Kumar Pathak Awadhesh Kumar Rai Gyanendra Kumar Rai |
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Institution: | (1) Centre of Food Technology, University of Allahabad, Allahabad, 211 002, Uttar Pradesh, India;(2) Laser Spectroscopy Research Laboratory, Department of Physics, University of Allahabad, Allahabad, 211 002, India |
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Abstract: | In the present paper the ability of calibration free laser induced breakdown spectroscopy (CF-LIBS) as a quality control tool
to monitor the composition of different minerals present in food supplement samples belonging to Indian brands (brand-A and
brand-B) has been demonstrated. LIBS spectra of these two food supplements (brand-A and brand-B) available in the form of
tablet have been recorded. As reported by manufacturers of these two food supplements, LIBS spectra of brand-A contains the
spectral signatures of minerals like Ca, Mg, C, P, Zn, Fe, Cu, and Cr whereas LIBS spectra of brand-B shows the presence of
spectral lines like Ca, Mg and C. The spectral signatures of Na and K are also found in both brands whereas spectral signature
of Ti is observed only in brand-B but these elements are not mentioned on the nutritional label of the brands. The quantitative
analysis of mineral contents in food supplements has been done using CF-LIBS for brand A and brand B to verify the content
of the minerals reported by the manufacturer of the food supplements. Our results show that Ca and Mg are the main matrix
elements of these brands. The concentration of minor and trace elements estimated using CF-LIBS technique is found in agreement
with the reported nutritional values of both the brands. The concentration of major elements Ca and Mg are also estimated
from Atomic Absorption Spectroscopy which is in close agreement with CF-LIBS result. |
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