desorption time was 10 min at 250°C in the GC inlet in the splitless mode. 2.3 Sample Matrix Selection Whole freeze-dried sample (1.0 g) was weighed into a clear, 20 mL headspace vial (Gerstel, Linthicum, MD, USA), capped (magnetic crimp caps with PTFE septa, Gerstel, Linthicum, MD, USA), and placed on the headspace autosampler.