Abstract
Type 2 diabetes drug tablets containing voglibose having dose strengths of 0.2 and 0.3 mg of various brands have been examined, using laser-induced breakdown spectroscopy (LIBS) technique. The statistical methods such as the principal component analysis (PCA) and the partial least square regression analysis (PLSR) have been employed on LIBS spectral data for classifying and developing the calibration models of drug samples. We have developed the ratio-based calibration model applying PLSR in which relative spectral intensity ratios H/C, H/N and O/N are used. Further, the developed model has been employed to predict the relative concentration of element in unknown drug samples. The experiment has been performed in air and argon atmosphere, respectively, and the obtained results have been compared. The present model provides rapid spectroscopic method for drug analysis with high statistical significance for online control and measurement process in a wide variety of pharmaceutical industrial applications.





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Acknowledgements
The authors are thankful to Prof. A N Dwivedi, Department of English, University of Allahabad, to Dr. A K Pathak, Department of Physics, Ewing Christian College, University of Allahabad and to Dr. Abhimanyu Kumar Singh and Dr. G S Maurya, Department of Physics, the University of Allahabad for their valuable suggestions and support. One of the authors, Pravin Kumar Tiwari, is thankful to the University Grant Commission, New Delhi, India, for providing the UGC DPhil fellowship.
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I would like to inform that the Departmental Programme Committee (DPC), Department of Physics, Faculty of Science, University of Allahabad, and the Research Degree Committee (RDC), University of Allahabad, have approved the topic Study of Pharmaceutical Sample using Spectroscopic techniques for DPhil research work. This is also approved by the Registrar, University of Allahabad. The manuscript Rapid analysis of pharmaceutical drugs using LIBS coupled with multivariate analysis is a part of the abovesaid DPhil degree work. This proves the ethical approval for our study is not required.
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We, Pravin Kumar Tiwari, Shikha Awasthi, Rohit Kumar, Raj Kumar Anand, Pradeep Kumar Rai and Awadhesh Kumar Rai, authors of the article Rapid analysis of pharmaceutical drugs using LIBS coupled with multivariate analysis declare that no individual rights are infringed during this study. In our study, we did only compositional analysis of medicine in our laboratory; thus, the medicine (voglibose) has not been used for any clinical purpose.
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Tiwari, P.K., Awasthi, S., Kumar, R. et al. Rapid analysis of pharmaceutical drugs using LIBS coupled with multivariate analysis. Lasers Med Sci 33, 263–270 (2018). https://doi.org/10.1007/s10103-017-2358-8
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DOI: https://doi.org/10.1007/s10103-017-2358-8