Determination of sodium fatty acid in soap Formulation Using Fourier Transform Infrared (FTIR) spectroscopy and multivariate calibrations.

• Main Authors: Abdul Rohman, Che Man, Yaakob
• Format: Article
• Language: English; English
• Published: Springer Verlag 2011
• Online Access: http://psasir.upm.edu.my/id/eprint/24068/1/Determination%20of%20sodium%20fatty%20acid%20in%20soap%20Formulation%20Using%20Fourier%20Transform%20Infrared.pdf; http://psasir.upm.edu.my/id/eprint/24068/
• Institution: Universiti Putra Malaysia

Fourier Transform Infrared (FTIR) spectroscopy using an attenuated total reflectance (ATR) accessory has been investigated as a method for the determination of sodium-fatty acid (sodium-FA) in soap formulations. Multivariate calibrations namely partial least squares regression (PLS) and principle component regression (PCR) were developed for the prediction of sodium-FA using spectral ranges on the basis of relevant IR absorption bands related to sodium-FA. The sodium-FA content in soap formulations was predicted accurately at wavenumbers of 1,570–1,550 cm−1, which is specific for RCOO− Na+ vibration. The PLS method was found to be a consistently better predictor when both PLS and principal component regression (PCR) analyses were used for quantification of sodium-FA. Furthermore, FTIR spectroscopy can be an alternative technique to American oil Chemist Society methods which use a titrimetric technique because FTIR offers rapid, easy sample preparation and is friendly to the environment.