Open AccessQuantitative determination of naltrexone by attenuated total reflectance – FTIR spectrometry using partial least squares (PLS) wavelength selection
Author(s) -
Mohammadreza Khanmohammadi,
Hamid Mobedi,
Elaheh Mobedi,
Kazem Kargosha,
Amir Bagheri Garmarudi,
Keyvan Ghasemi
Publication year - 2009
Publication title -
spectroscopy
Language(s) - English
Resource type - Journals
eISSN - 1875-922X
pISSN - 0712-4813
DOI - 10.1155/2009/942185
Subject(s) - absorbance , partial least squares regression , chemistry , analytical chemistry (journal) , chromatography , aqueous solution , fourier transform infrared spectroscopy , spectrophotometry , attenuated total reflection , naltrexone , wavelength , infrared spectroscopy , mathematics , optics , statistics , physics , organic chemistry , biochemistry , receptor , opioid
A new method is presented for quantitative determination of naltrexone in aqueous solutions based up on the wavelength selection in mid-FTIR spectra using partial least squares (PLS) technique. The main aim is to find wavelengths which produce significant improvements in PLS prediction. PLS wavelength selection treatment is performed on the data obtained by attenuated total reflectance Fourier transform infrared spectrometry in 830–1800 cm −1 wavenumber range. No separation or extraction steps are required prior to determination procedure and a simple pretreatment is performed. Absorbance spectra were employed for measurements using a set of 7 aqueous standard solutions of naltrexone. The method is applicable for pharmaceutical samples in aqueous solution in the presence of impurities, while it is simple, rapid and accurate. The results obtained from real samples were compared with those obtained using Ultra Violet spectrophotometry as a reference method. Statistical parameters such as R 2 , REP, RMSEC and RMSECV were evaluated, and number of factors, number of scans and resolution were also optimized. In this method R 2 and RMSEC for proposed procedure have been found to be 0.9983 and 0.1297, respectively.