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The SPME (Solid Phase Micro Extraction) module, coupled to the GC-MS instrument, is a specific injection syringe equipped with a retractable fiber allowing liquid and gaseous samples to be taken from the headspace by the adsorption and desorption system to analyze the volatile compounds. This module is used for a quantitative and qualitative determination of volatile molecules even in the trace state (mass in the order of ng) but which can serves as markers of freshness and alteration of plant and animal derived foods such as cereal, dairy, meat and aquatic products.