Extraction of sample
Selected samples were extracted using a
head space solid phase micro extraction (SPME)
method. Seventy-five gram of sample was put into
an Erlenmeyer flask, sealed with aluminum foil
with protective seal and fitted with a space solid
phase micro extraction gastight syringe in such a
way the syringe would be directed to just above the
food sample. The flask was placed in a water bath
at 50oC with the syringe still be fitted. The volatiles
released from the sample during 30 minutes at 50oC
were absorbed onto SPME. The volatile collected
from samples were analyzed using a HP 5890A
gas chromatograph connected to a HP 5970 mass
selective detector (Hewlett Packard).