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- W2034299436 abstract "Abstract This paper summarizes the application of stoichiometric analytical approaches to quantitative IR analysis and describes the development of a rapid and sensitive Fourier transform infrared (FTIR) method using such an approach for the determination of low levels (<0.005%) of free fatty acids (FFA) in refined edible oils. The method simply involves mixing the sample with methanol containing 2 g /L sodium carbodiimide (NaHNCN) on a vortex mixer for 30 s to convert the FFA to their salts, centrifuging the sample to separate the methanol phase containing the FFA salts from the oil, recording the FTIR spectrum of the upper methanol layer in a 100‐µm CaF2 transmission flow cell, and ratioing this spectrum against that of the NaHNCN/methanol solution. The concentration of FFA salts is determined from the resulting differential spectrum by measurement of the v(COO−) absorbance at 1573 cm−1 relative to a reference wavelength of 1820 cm−1. A calibration spanning the range 0–0.1% FFA (expressed as oleic acid)..." @default.
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- W2034299436 date "2005-07-01" @default.
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- W2034299436 title "A New FTIR Method for the Analysis of Low Levels of FFA in Refined Edible Oils" @default.
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- W2034299436 doi "https://doi.org/10.1081/sl-200063648" @default.
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