MICROWAVE DISTILLATION-SOLID PHASE ADSORBENT TRAPPING DEVICE FOR THE DETERMINATION OF OFF-FLAVORS, GEOSMIN AND METHYLISOBORNEOL, IN CATFISHTISSUE BELOW THEIR REJECTION LEVELS

Described is a rapid microwave-mediated steam distillation device for determining two predominant off-flavor compounds, geosmin and methylis oborneol, in catfish tissue. A microwave on-time of 10 min is needed t o efficiently remove these off-flavor compounds from the sample matrix and trap them on a solid phase adsorbent, A minimal amount of organic solvent is used to elute the trapped compounds. The extract is then a nalyzed by gas chromatography with ion trap detection in the selective ion storage mode. Detection limits in the sub-parts-per-billion range are obtained with this method.