BARNETT ET AL.: USE OV CARBON DIOXIDE IN BRINE 



By the 11th day, however, the taste panel 

 rated those held in the untreated brine as being 

 unacceptable. 



In contrast, the salmon held 18 days in the 

 treated brine were acceptable. The panel judged 

 that these salmon had good texture and color 

 but that they had only fair flavor. The deteri- 

 oration in the flavor may have been due in part 

 to the presence of absorbed salt (a salt concen- 

 tration of about 1.0% is generally considered 

 to be optimum) but was due mostly to chemical 

 changes that occurred in the flesh during storage. 



SUMMARY AND CONCLUSIONS 



The purpose of the work reported here was 

 to determine the effect that holding rockfish 

 or chum salmon in refrigerated brine treated 

 with CO2 would have on their storage life and 

 quality. 



Storing rockfish in brine treated with CO2 

 increased their storage life by at least 1 week. 

 The CO2 inhibited bacterial growth and retarded 

 the rate at wliich the rockfish decreased in qual- 

 ity. 



Storing chum salmon in brine treated with 

 CO2 gave similar results. 



This study indicates that the addition of CO2 

 to refrigerated brine considerably improves the 

 preservation properties of this medium with re- 

 spect to bacterial spoilage. The absorption, how- 

 ever, of water, uptake of salt, loss of soluble 

 protein, and the as-yet-undetermined subsequent 

 refrigerated shelf life of the landed product 

 are problems that remain to be solved. At this 

 time, we therefore cannot recommend that rock- 

 fish and chum salmon be held in modified re- 

 frigerated brine beyond presently accepted stor- 

 age periods — that is, 8 to 10 days for either 

 species. 



Although we do not at present recommend 

 extending the holding times, the reader may 

 wish to keep in mind that the quality of a landed 

 product held in refrigerated brine is significantly 

 improved by the addition of CO2. 



Future modified brine studies will be directed 

 at solving the above mentioned problems and the 

 problems concerned with accelerated corrosion. 



LITERATURE CITED 



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OSTERHAUG, K. L. 



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441 



