动力学模型预测泥鳅(Misgurnus anguillicaudatus)半干制品的货架期

以泥鳅(Misgurnus anguillicaudatus)半干制品为研究对象,测定和分析其在不同贮藏温度(4°C、20°C、30°C和40°C)下,菌落总数、挥发性盐基氮(TVBN)、脂肪氧化程度(TBA值)与感官评分各项指标随贮藏时间的变化。结果表明,泥鳅半干制品在不同贮藏温度下,随着贮藏时间的延长品质逐渐下降,贮藏温度越低,品质指标变化越缓慢。经Pearson相关性分析,确定影响泥鳅半干制品品质变化的关键因子为菌落总数;基于Arrhenius方程,进一步建立菌落总数与贮藏时间、贮藏温度之间的动力学模型,该模型中活化能Ea为26.5 kJ/mol,反应速率常数k0为3186.6,推算得出泥鳅半干制品货架期预测值与实测值相对误差较小,该动力学模型可准确预测泥鳅半干制品在4—40°C贮藏温度下的货架期。本研究可为泥鳅半干制品的开发、流通奠定理论基础。

PREDICTION OF SHELF LIFE ON SEMI-DRIED MISGURNUS ANGUILLICAUDATUS PRODUCT BY KINETIC MODEL

In this paper, we studied the variation of indicators of semi-dried Misgurnus anguillicaudatusproduct, such as total colony counts, total volatile basic nitrogen (TVBN), fat oxidation degree (TBA value) and sensory evaluation in different time at 4°C, 20°C, 30°C and 40°C, respectively. The results showed that the quality of the product got worse as the storage time extended and the change of quality indicators became slower with the lower storage temperature. Pearson correlation analysis showed that the crucial factor affecting product quality was total colony count. Based on the Arrhenius equation, the kinetic model was established between the total colony count and storage time as well as storage temperature. The activation energy Eain the model was 26.5 kJ/mol and the reaction rate constant k0was 3186.6. By using this kinetic model, the prediction values of shelf life in different storage temperatures were close to the practical dates, and each relative error with this model was little. Therefore, this model can predict the shelf life of semi-dried M. anguillicaudatusproduct at the storage temperature between 4°C to 40°C. This result can provide the theoretical basis for the exploitation and market circulation of semi-dried M. anguillicaudatusproduct.