Determination of soybean oile Adulteration in sesame oile by volatile organic compounds profile by polypyrrole-CuO nanocomposite modified polyesterfiber as a solid phase microextraction agent/gas chromatography

New Polypyrrole-CuO nanocomposite modified polyester fibers have been prepared by solution polymerization in the basic solution in the presence of pyrrole, FeCl3 and CuCl2. The morphology of the Polypyrrole-CuO film on the surface of the fibers was examined by scanning electron microscope (SEM). The presence of the CuO particle in the polypyrrole-CuO nanocomposite was verified by FT-IR spectroscopy. The synthesized particles (30-150 nanometers) were observed according to the SEM results. The synthesized fiber was used as a headspace solid phase microextraction (HS-SPME) agent to extract VOCs from sesame oil and analysis by gas chromatography. The gas chromatogram profile of pure sesame oil and sesame oil samples mixed with different proportion of soybean oil was compared and used to authentication of pure sesame oil determination. The results showed that the VOCs profile of net sesame oil is different from adulterated oils. In the gas chromatogram profile 5 section of chromatogram distinguished (A=0-2, B=0-5, C=5-10, D=10-15 and E=15-20 minutes) and used for classification of different oil groups applying linear discrimination analysis (LDA). Data analysis showed that this technique has capability to detect adulteration of sesame oil with soybean oil.