Evaluation of freshness of Carassius Auratus based on electronic nose

The volatile odor changes of Carassius Auratus which stored at refrigeration ( 4℃) and partial freezing (-3℃) separately were investigated by electronic nose.The raw data of the sensor's evaluation was analyzed by principal component analysis ( PCA) and discriminant factor analysis ( DFA) , then combination the smell sensory score with electronic nose data for PLS analysis. The results showed that with the extension of storage time, the smell changes of samples under different storage temperatures both can be distinguished by PCA and DFA analysis effectively. The cumulative contribution rate of the first and second principal components reached to99.797% and 99.425% respectively. The cumulative contribution rate of DF1 and DF2 reached to 99.263% and97.807%.The correlation coefficient ( R2) reached to0.9976 and 0.9887 through the analysis of PLSbetween the smell sensory score and electronic nose data, there was a high correlation between them.Therefore the electronic nose could be used for distinguish different freshness of Crucian Carp stored at refrigeration and partial freezing.But the samples stored at refrigeration had a better effect of distinction.