From the FT-IR spectra, it is clear that the peaks arise from above 700 to 1500 cm −1 for the bending vibrations of carbonyl ester and methyl groups [44].

FT-IR spectra of ester 1 and ester 4 unlike other analysed samples of the fatty acid esters have absorption bands respectively at 3009 cm −1 (Fig. 2) and at 3004 cm −1 (Fig. 3) which ...

fast and reliable analytical technique for the quantification of fatty acid methyl ester content in the produced biodiesel. The quantification was done with the use of a partial least squares model developed based on the infrared spectra obtained. It was shown that microwave irradiation is cap.

2014年9月1日 · Gas-phase mid-infrared (IR) absorption spectra (2500–3400 cm −1) for eleven fatty acid methyl esters (FAMEs) have been quantitatively measured at temperatures between 25 and 500 °C using an FTIR spectrometer with a resolution of 1 cm −1.

ACETEM (E472a) and CITREM (E472c) are fatty acid esters used as additives in the food industry to improve quality, stability and sensory properties of food products due to their emulsifying,...

Fourier transform infrared spectroscopy was employed as a fast and reliable analytical technique for the quantification of fatty acid methyl ester content in the produced biodiesel. The quantification was done with the use of a partial least squares model developed based on the infrared spectra obtained.

Spectra-structure correlations of saturated and unsaturated medium-chain fatty acids. Near-infrared and anharmonic DFT study of hexanoic acid and sorbic acid. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2017 , 185 , 35-44.

A primary Fourier transform infrared (FTIR) method capable of determining acidity in ester-based oils is described and evaluated. Absolute free fatty acid (%FFA) and acid value (AV) calibrations were devised by spiking oleic acid into a refined, acid-free oil and measuring ν COO – at ∼1569 and ν phenolate – at ∼1588 cm –1 ...

2015年9月23日 · A primary Fourier transform infrared (FTIR) method capable of determining acidity in ester-based oils is described and evaluated. Absolute free fatty acid (%FFA) and acid value (AV) calibrations were devised by spiking oleic acid into a refined, acid-free oil and measuring ν COO(-) at ∼ 1569 and ν p …

Chromatographic Analysis of Fa y Acid Methyl Esters (FAMEs) is an important tool in the characteriza on of fats and oils and in the determina on of total fat and trans-fat content in foods. To prepare samples for analysis, fats are extracted, saponified and …