Figure 6.
GCMS analysis of the vessel area at 22 min. (A) Molecules in the white circular area at 22 min were analyzed by their molecular weight and fragmentation pattern. The fragmentation pattern of the major peaks is assigned as follows: C3 = 71, C4 = 86, C7′ = 97, C7 = 129, and molecular ion M+ (C18) = 282. (B) Database search identified the unknown molecule as oleic acid, as the positive control. m/z values of all fragments were compared to an authentic sample of oleic acid (not shown) and the known spectrum of oleic acid from the database.