Investigation of biogenic amines and nucleotide degradition products of cat fish (Silurus glanis L., 1758) stored in ice

Quality of cat fish stored in ice was investigated by sensory (QIM and Torry freshness scheme), chemical (TVB-N, nucleotide degradition products, nucleotide ratios and biogenic amines), and microbiological methods (Total viable count and Coliform bacteria). According to sensory results, the shelf life of cat fish filets stored in ice was 14-18 days. During storage period, TVB-N value showed fluctuation and reached maximum levels (36.76 mg/100 g) at end of the storage period. While the levels of ATP, ADP and AMP remain stable with low concentration (<0.4 ?mol/g), the contents of IMP, HxR and Hx changed significantly during storage period. Cat fish filets stored in ice, K and Ki value increased linearly with storage time. At end of the storage period, K, Ki, H and G value reached %95.65, <%99.68, %78.44 and %439.74, respectively. In all analyzed samples, putresine, cadaverine, spermine, spermidine, seratonine and agmatine were found in cat fish fillets during storage period. Total viable count of cat fish showed an increase with storage time and were ?109 cfus/g in the corresponding organoleptic shelf life.