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Quantitative Monitoring of the Amidation Reaction Between Coconut Oil and Diethanolamine by Attenuated Total Reflectance Fourier Transform Infrared Spectrometry
Author(s) -
Khanmohammadi Mohammadreza,
Kojidi Mohammadjavad Hosseinnia,
Garmarudi Amir Bagheri,
Ashuri Ahmad,
Soleymani Majid
Publication year - 2009
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-008-1101-7
Subject(s) - chemistry , diethanolamine , attenuated total reflection , coconut oil , partial least squares regression , potentiometric titration , analytical chemistry (journal) , chromatography , yield (engineering) , fourier transform infrared spectroscopy , calibration , mass spectrometry , coefficient of determination , infrared spectroscopy , organic chemistry , mathematics , chemical engineering , ion , statistics , materials science , food science , engineering , metallurgy
An analytical procedure was developed to monitor the batch reaction of coconut oil and diethanolamine which also would determine the cocodiethanolamide (CDEA) content of the final product. The method was based on attenuated total reflectance Fourier transform infrared spectrometry utilizing partial least squares regression. The calibration was modeled in the 1,781–1,714 and 1,658–1,639 cm −1 spectral regions for coconut oil and CDEA respectively. The models were then applied to predict the amidation process yield and to monitor the in situ kinetics of reactions between coconut oil and DEA. The root mean square error of prediction was 0.590 and 0.336 for coconut oil and CDEA respectively. The proposed method can also be successfully applied to the determination of purity in commercial grade CDEA samples and would give reliable results in comparison with the potentiometric titration reference method.