A transmission FTIR spectroscopic method was developed for direct, inexpensive and fast quantification
of paracetamol content in solid pharmaceutical formulations. In this method paracetamol content is
directly analyzed without solvent extraction. KBr pellets were formulated for the acquisition of FTIR spectra
in transmission mode. Two chemometric models: simple Beer’s law and partial least squares
employed over the spectral region of 1800–1000 cm1 for quantification of paracetamol content had a
regression coefficient of (R2) of 0.999. The limits of detection and quantification using FTIR spectroscopy
were 0.005 mg g1 and 0.018 mg g1, respectively. Study for interference was also done to check effect of
the excipients. There was no significant interference from the sample matrix. The results obviously
showed the sensitivity of transmission FTIR spectroscopic method for pharmaceutical analysis. This
method is green in the sense that it does not require large volumes of hazardous solvents or long run
times and avoids prior sample preparation.