LI Miao-yun, TIAN Lu, HUANG Xian-qing, ZHAO Gai-ming, LIU Yan-xia, SUN Ling-xia
In this paper,the chilled pork were packaged by pallet,vacuum and modified atmosphere under the conditions of storage at 5 ℃,and the principal component analysis and cluster analysis were carried out to study the correlation between the spoilage quality indicators and the different packaged chilled pork. The results from principal component analysis of the changes in quality indicators showed that microbiological cadaverine,putrescine,conductivity,TVBN and pH could be used as spoilage quality indicators to reflect the shelf life of chilled pork. Component plot in rotated space of the principal component analysis could visually determine the relationship of the partial indicators and delete the irrelevant indicators. Then the dendrogram of cluster analysis divided indicators into four categories as follows. The distance between the total viable counts and TVBN,Brochothrix thermosphacta,Pseudomonas spp. were 0. 255,0. 320 and 0. 340,respectively. The distance between TVBN and Pseudomonas spp. and Electrical conductivity were 0. 282 and 0. 305,respectively. The distance between putrescine and cadaverine was 0. 356,which was far compared with other indicators. The distance between pH and other indicators were farther. Therefore,the total viable counts,TVBN,Pseudomonas spp. and electrical conductivity could be used as spoilage indexes of chilled pork,and the contents reflected of the spoilage degree.