The impact of various Pacific herring maturing methods under the production of salted output on the rheological indexes alteration is defined
Biochemical processes that take place within the process of the fish maturing cause alterations in rheological characteristics of muscle tissue. The muscle tissue tenderization while maturing is an important sensory characteristic. The speed of the fish´s tissue softening is directly dependent on the protease activity [1, 2]. We have developed methods of the Pacific herring maturing that allow us to increase the speed of the fish´s biochemical maturing and shorten the duration of the technological process: preliminary maturing of the unsalted herring under the regulated conditions (method 1) [3]; maturing that is combined with a defrosting, in the potassium chloride solution (method 2).
To characterize the rheological characteristics the research of the Pacific herring utmost shift tension (UST) alterations were carried out. The UST was defined with the structure-o-meter ST-1M by method that is based upon the definition of the cone loading tension with its introduction to the definite depth into the product and the definition of the tension relaxation time, which is caused by its deformation.
Table one provides us with the data of the herring tissue UST alteration while using the maturing methods described above. Also the data of the UST alterations while using the traditional method of salted fish maturing are illustrated for comparison:
The alterations in Pacific herring UST in dependence of its keeping, kpascal
|
Sample |
Keeping duration, days |
|||||
|
0 |
2 |
4 |
6 |
8 |
10 |
|
|
Experimental sample 1 |
22, 8 |
22,2 |
19,4 |
16,6 |
15,2 |
14,8 |
|
Experimental sample 2 |
22,4 |
21,9 |
20,7 |
17,8 |
16,4 |
15,4 |
|
Experimental sample 3 |
23,4 |
23,2 |
22,8 |
21,6 |
20,8 |
19,6 |
References