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Application of infrared spectroscopy to the analysis of primary fatty amide mixtures

, : Application of infrared spectroscopy to the analysis of primary fatty amide mixtures. Jour Amer Oil Chem Soc 39(1): 39-44

The composition of fatty amide mixtures containing mostly simple primary amides has been studied by means of an infrared method utilizing the Amide I carbonyl absorption band. In dilute chloroform solution the amides (CH3 (CH2)nCONH2) absorb consistently at about 5.95 [mu] and do not display apparent association or enolization. The concentration of unsubstituted amides has been quantitatively related to the intensity of the Amide I band throughout the range from 1 to 100%. With the scale expansion the sensitivity of the method may be extended to 0.03% without difficulty. The influence of certain impurities on the intensity of the Amide I band is discussed. Carbonyl absorption from fatty acids, ketones and esters constitutes an interference. N-monosubstituted amides also contribute to the absorption observed at 5.59 [mu], but their presence is indicated by additional absorption at about 6.60 [mu]. The determination of small amounts of amides in amines may be accomplished by measuring the total Amide I absorption of a sample dissolved in tetrachloroethylene and relating this absorption to that of known mixtures run under identical conditions.


DOI: 10.1007/bf02633348

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