title: Direct FTIR analysis of isolated trans fatty acids in edible oils using disposable polyethylene film.
abstract: A new transmission-based Fourier transform infrared (FTIR) spectroscopy method has been developed to determine trans fatty acids (TFA) content in edible oils using 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.
authors.affiliation: College of Food Science and Engineering, Northwest A&F University, 28 Xinong Road, Yangling 712100, Shaanxi, PR China.
authors.forename: Lirong
authors.initials: L
authors.lastname: Xu
authors.affiliation: College of Food Science and Engineering, Northwest A&F University, 28 Xinong Road, Yangling 712100, Shaanxi, PR China.
authors.forename: Xufei
authors.initials: X
authors.lastname: Zhu
authors.affiliation: College of Food Science and Engineering, Northwest A&F University, 28 Xinong Road, Yangling 712100, Shaanxi, PR China.
authors.forename: Xiumei
authors.initials: X
authors.lastname: Chen
authors.affiliation: College of Food Science and Engineering, Northwest A&F University, 28 Xinong Road, Yangling 712100, Shaanxi, PR China.
authors.forename: Daijun
authors.initials: D
authors.lastname: Sun
authors.affiliation: College of Food Science and Engineering, Northwest A&F University, 28 Xinong Road, Yangling 712100, Shaanxi, PR China. Electronic address: xiuzhuyu1004@hotmail.com.
authors.forename: Xiuzhu
authors.initials: X
authors.lastname: Yu
mesh_terms: D002138:Calibration; D005504:Food Analysis / Q000379:methods*; D010938:Plant Oils / Q000737:chemistry*; D020959:Polyethylene / Q000737:chemistry*; D011786:Quality Control; D015203:Reproducibility of Results; D017550:Spectroscopy, Fourier Transform Infrared; D044242:Trans Fatty Acids / Q000032:analysis*
chemical_list: D010938:Plant Oils; D044242:Trans Fatty Acids; D020959:Polyethylene
keywords: Edible oil; FTIR; Quantitative analysis; Trans fatty acid