Abstract
Salmon ovary outer membrane (SOM) is a byproduct of the salmon industry; however, the effective utilization of SOM for food materials and supplements is anticipated as the demand for fish and seafood increases worldwide. The purposes of the present study were to assess the chemical composition of SOM, the characteristics of SOM protein (SOMP), and its effects on serum and fecal biochemical parameters in mice. SOM contained high levels of crude protein (61.9 g/100 g) and crude lipid (18.9 g/100 g). The protein pattern of SOMP was different from those of fish muscle protein and roe; it was abundant in collagen, as calculated from the hydroxyproline content. In addition, SOMP exhibited lower protein digestibility during in vitro digestion analyses compared with casein. Male C57BL/6J and KK-Ay mice were fed a casein-based semi-purified diet or a diet with replacement of part of the dietary protein (50%) by SOMP for four weeks. Mice fed the diet containing SOMP showed elevated fecal nitrogen and mucins contents and reduced levels of serum liver injury markers and fecal ammonia. These results show for the first time that chemical composition of SOM, and SOMP, contain a resistant protein fraction and a large amount of collagen. Therefore, SOM is a potential source of marine collagen and functional food material for promoting the health of the liver and colon.
Highlights
The production of salmon meat and processed food has increased both in Japan and worldwide [1]
To clarify the possible usage of salmon ovary outer membrane (SOM) as a potential source of collagen and health-promoting food material, we investigated the chemical composition of SOM and the profile of protein obtained from SOM
There is a potential that the protein of SOM has health-promoting and -maintaining effects, in this study, SOM protein (SOMP) was prepared from SOM
Summary
The production of salmon meat and processed food has increased both in Japan and worldwide [1]. SOM is removed from the ovary sack during ikura preparation in a food factory In this process, SOM is produced as a waste product. To clarify the possible usage of SOM as a potential source of collagen and health-promoting food material, we investigated the chemical composition of SOM and the profile of protein obtained from SOM. Obesity and being overweight has been identified as a multiple risk factor for diabetes, cardiovascular disease, and some cancers [10]. This issue becomes important, medically, and socioeconomically [11]. We demonstrated the effects of dietary SOM protein (SOMP) on the biochemical compositions of serum and feces in C57BL/6J and type 2 diabetic/obese. We believe that the usage of salmon byproducts is important for the conservation of aquatic species as the demand for fish and seafood has increased worldwide
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