Abstract
Abstract A new gas-liquid chromatographic (GLC) method for the determination of indole in decomposed shrimp was submitted to collaborative study. Five samples of shrimp were analyzed in duplicate by the collaborators. The samples included passable and decomposed frozen raw shrimp and also decomposed shrimp that had been cooked and freeze-dried. The levels of indole in the samples ranged from 0 to approximately 110 μg indole/100 g shrimp. No indole was found in any of the passable samples by any collaborator. The amounts of indole found in the decomposed samples were approximately 14, 24, and 115 μg indole/100 g shrimp. The collaborators recovered an average of 106% of the indole which had been added to a sample of passable shrimp. A set of samples was analyzed by the present AOAC colorimetric method for comparison. The GLC method will also detect 3-methylindole (skatole). The method has been adopted as official first action.
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