Analysis of potato chips using FTIR photoacoustic spectroscopy

The suitability of Fourier transform infrared photoacoustic spectroscopy (FTIR-PAS) for analysing potato chips was investigated. The functional groups, vibration modes and intensities corresponding to frequencies related to moisture, fat and protein in PA spectra were labelled. Oxidation experiments were carried out by heating home-made chips in a convection oven at 80 °C. Changes in chemical groups related to fat and oil were observed visually and statistically. Spectral data were analysed using PCA correlation and a linear discriminant analysis technique with squared Mahalanobis distance metric to estimate the extent of oxidation. Results showed that deterioration indeed could be monitored by photoacoustic spectroscopy. Depth profile analysis of the samples showed that a spectral difference in the fat, moisture and protein bands at different layers exists. Results demonstrated that FTIR-PAS with its depth-profiling capability could be used for qualitative analysis. © 2000 Society of Chemical Industry

[1]  M. Guillén,et al.  Usefulness of the frequency data of the fourier transform infrared spectra to evaluate the degree of oxidation of edible oils. , 1999, Journal of agricultural and food chemistry.

[2]  J. Irudayaraj,et al.  Examination of full fat and reduced fat Cheddar cheese during ripening by Fourier transform infrared spectroscopy. , 1998, Journal of dairy science.

[3]  J. Irudayaraj,et al.  Sampling Technique for Cheese Analysis by FTIR Spectroscopy , 1998 .

[4]  M. Guillén,et al.  Characterization of edible oils and lard by fourier transform infrared spectroscopy. Relationships between composition and frequency of concrete bands in the fingerprint region , 1997 .

[5]  R. Palmer,et al.  Comparison of Phase Rotation, Phase Spectrum, and Two-Dimensional Correlation Methods in Step-Scan Fourier Transform Infrared Photoacoustic Spectral Depth Profiling , 1997 .

[6]  R. Schudy,et al.  Identification of Fourier transform infrared photoacoustic spectral features for detection of Aspergillus flavus infection in corn. , 1997, International journal of food microbiology.

[7]  M. Mossoba,et al.  New techniques and applications in lipid analysis , 1997 .

[8]  R. Wilson,et al.  Comparison of two infrared spectroscopic methods for cheese analysis. , 1995, Talanta.

[9]  F. R. van de Voort,et al.  A rapid, automated method for the determination ofcis andtrans content of fats and oils by fourier transform infrared spectroscopy , 1995 .

[10]  Georges Sinnaeve,et al.  Quantitative determination of the composition of individual pea seeds by fourier transform infrared photoacoustic spectroscopy , 1995 .

[11]  K. Knutson,et al.  Fourier transform infrared spectroscopy investigations of protein structure. , 1995, Pharmaceutical biotechnology.

[12]  F. R. van de Voort,et al.  The determination of peroxide value by fourier transform infrared spectroscopy , 1994 .

[13]  D. Bertrand,et al.  Characterization of edible oils, butters and margarines by Fourier transform infrared spectroscopy with attenuated total reflectance , 1994 .

[14]  J. Sedman,et al.  Monitoring the oxidation of edible oils by Fourier transform infrared spectroscopy , 1994 .

[15]  J. Sedman,et al.  A Rapid FTIR quality control method for fat and moisture determination in butter , 1992 .

[16]  Peter S. Belton,et al.  The potential of Fourier transform infrared spectroscopy for the analysis of confectionery products , 1988 .