Direct FTIR analysis of isolated trans fatty acids in edible oils using disposable polyethylene film

卷:185

Xu, Lirong ; Zhu, Xufei ; Chen, Xiumei ; Sun, Daijun ; Yu, Xiuzhu

关键词: Edible oil;    Trans fatty acid;    FTIR;    Quantitative analysis;   

DOI  :  10.1016/j.foodchem.2015.04.021

学科分类：食品科学和技术

【 摘 要 】

A new transmission-based Fourier transform infrared (FTIR) spectroscopy method has been developed to determine trans fatty acids (TFA) content in edible oils thing disposable polyethylene (PE) film as a spectral acquisition accessory. Calibration standards were devised by gravimetrically adding TFA to TFA-free oil. The response was measured at 990-945 cm(-1) against the baseline. A linear relationship between the areas in the spectral regions 1670-1625 cm(-1) and 990-945 cm(-1) in TFA-free oil samples was established to compensate for interference due to underlying triacylglycerol absorptions in the trans measurement region (990-945 cm(-1)). Subsequently, the area measured at 990-945 cm(-1) was corrected for interference, using the linear equation obtained, to determine TFA content. Results indicated that the PE film-based FTIR method for analyzing TFA content in edible oils was simple and rapid, and could be used effectively as an alternative to gas chromatography and mass spectrometry methods. (C) 2015 Elsevier Ltd. All rights reserved.