Journal of Fisheries Science and Technology

Journal of Fisheries Science and Technology

Protein hydrolysates from viscera of cultured Siberian sturgeon (Acipenser baerii) and its use for bacterial (Salmonella typhi) culture medium

Authors
Roghayeh Jafari Taraji 1
Alireza Alishahi 2
Seyed Mahdi Ojagh 3
Abbas Esmaeili Molla 4
1 Gorgan University of Agricultural Sciences and Natural Resources
2 Assistant Professor
3 Assistant Professor of Seafood Processing Department
4 Assistant Professor of Aquatic Physiology
Abstract
Protein hydrolysate (PH) from viscera of cultured Siberian sturgeon (Acipenser baerii) was produced. To optimize the production conditions, Response Surface Method (RSM) was employed to examine the effects of three different operating conditions, including time, pH, and enzymatic concentration (Alcalase) on the degree of hydrolysis.The mathematical model showed acceptable fitness of the experimental data as R2 equaled 0.97, which indicated that major part of the variability within the range of values could be explained by the model. The results showed that the highest degree of hydrolysis (58.21%) was related to the treatment which happened at the enzymatic concentration of 2%, 60 minutes time, and pH=8. Treatment under hydrolysis condition (i.e., E/S = 2%, Time = 45 min, and pH = 8.5) had the highest protein content (42.37g/l), which was used as an alternative to commercial peptone medium (Triptic soy broth) to assess the growth of Salmonella typhi bacteria from 0 to 48 hours. Although there was an upward trend in growth rate of S. typhi both in control and No. 15 (Alcalase) treatments, the log growth of control treatment was found to be better than that of Alcalase treatment. However, there existed no significant difference between the two treatments.
Keywords
Siberian sturgeon (Acipenser baerii)
Salmonella typhi
Protein hydrolysates
Alcalase