sample - y = 2,8571x
2
- 59,143x + 1022, semi-finished products with fucus - y = -30x
+ 1186 and semi-finished products with kelp - y = 4,2857x
2
- 79,714x + 1268.
Figure 4. Boundary shearing stress of semi-finished minced fish flash:
1 – control, 2 – with fucus, 3 – with kelp
The increase in the relative strength of penetration in minced fish flash with
increasing seaweed weight fraction can be explained by the fact that at the stage of
mixing minced fish flash with seaweed the process of formation of protein gel structure
begins, in which under certain conditions a conformational transition of
macromolecules takes place, resulting in their aggregates, which are particles of
dispersed lyophilic phase. With the increase in the number of such particles, hydrogen
bonds create contacts between the aggregates and form a three-dimensional structure
of the protein gel, which provides the corresponding mechanical properties (viscosity,
strength, elasticity, etc.) to the system, in this case the one of minced fish flash.
For provision of a rationale for structural and mechanical properties and studying
their changes after heating minced fish flash, penetration was studied and boundary
shearing stress of the finished product was calculated.
Increase in penetration level was established in the finished products with addition
of seaweed compared to control sample (Fig. 5).
level increases in the finished minced fish flesh. The decrease of boundary
shearing stress after adding focus and kelp to the minced fish flesh could be explained
by increase of moisture retention ability and water-binding power which makes the
finished product fabricable that is tenderer, more succulent.
y = 2,8571x
2
-59,143x + 1022
y = -30x + 1186
y = 4,2857x
2
-79,714x + 1268
0
200
400
600
800
1000
1200
1400
7
14
21
28
35
B
oun
dary
shear
ing
st
re
ss
,
P
a
Storage duration, days
1
2
3
- 1678 -