温度波动对大黄鱼冷链流通期间鲜度品质及水分迁移的影响OACSTPCD

To investigate the changes of freshness and quality of cultured Pseudosciaena crocea during low-temperature circulation,this paper simulated the temperature conditions of cold chain and broken chain circulation and analyzed the trends of freshness indicators,such as sensory,color difference,texture,total volatile basic nitrogen(TVB-N)value,K value,and the total bacterial colony of P.cro-cea during the circulation process.Results showed that the sensory score and L*value of P.crocea decreased with the extension of circu-lation time,while the values of color difference b,TVB-N,K,and total bacterial colony increased gradually.The freshness indexes changed more significantly in the broken chain group compared to the cold chain group(P＜0.05).The results of low-field nuclear mag-netic resonance(LF-NMR)showed that the bound water stability of the broken chain group decreased rapidly,indicating that temperature fluctuations in the broken chain circulation had a greater impact on the bound water of fish and accelerated the deterioration of freshness quality of samples.The peak area of bound water(A2b+A21)was significantly correlated with the indicators of total bacterial colonization,organoleptic quality,color(L*and b*values),and chewiness,while the peak area of less mobile water(A22)and the peak area of free water(A23)were significantly correlated with the TVB-N and K values.Results reflect the potential quality and safety risks of P.crocea due to temperature fluctuations during cold chain distribution and provide a reference for the application of low-field NMR technology in monitoring product quality during cold chain logistics.