Abstract
The conditions for headspace solid phase microextraction (HS-SPME) analysis of volatile off-flavour compounds in citral emulsion were determined. Type of SPME phase (65μm PDMS/DVB, 100μm PDMS and 75μm CAR/PDMS), adsorption temperature and salt concentration were significant factors affecting total peak area in the gas chromatogram and optimised in one factor experiments. Then, adsorption temperature (30–50°C), adsorption time (20–40min), and salt concentration (0–6M) were studied to develop HS-SPME condition for obtaining the highest extraction efficiency. PDMS/DVB in 65μm was the optimum fiber because of high adsorption efficiency and good reproducibility. The optimal condition was adsorption at 50°C for 40min and 6M salt added to sample. Good Linearity, high recovery, good reproducibility and low limit of detection (LOD) for all off-odour compounds according to the optimised SPME conditions indicated that the SPME procedure was applicable for the analysis of the degraded citral products in headspace volatile of emulsion.
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