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

作者：Xu, Lirong; Zhu, Xufei; Chen, Xiumei; Sun, Daijun; Yu, Xiuzhu^*

来源：Food Chemistry, 2015, 185: 503-508.

DOI：10.1016/j.foodchem.2015.04.021

• Edible oil
• Trans fatty acid
• FTIR
• Quantitative analysis

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.

• 出版日期2015-10-15
• 单位西北农林科技大学