摘要：For the purpose of detecting a micro-quantity of offensive odor substances in fish with offensive odor, mass fragmentography method (GC-mass spectrometry with MID as a detector) was used. Geosmin, furfural, heptyladehyde, hexylaldehyde, and valeraldehyde were examined, because these are known as offensive odor components in water. Furfural and heptyladehyde were detected, but the presence of geosmin, hexylaldehyde, and valeraldehyde in the fish was not determined. All the tested substances were not detected with high-resolution GC-mass measurement (detection limit : ca. 10-9 g), but furfural and heptylaldehyde were recognized by the mass fragmentography method with MID (detection limit : ca. 10-12 g). In this study, the samples were concentrated 270 fold (w/v), and concentration in the fish was calculated as about 10-14 to 10-15 g. Therefore, it is considered that the recognized substances do not act the main role as an offensive odor substance in the fish.
