Comparative analysis of nutritional components of several roes

In order to analyze the nutrition characteristics of different kinds of roes, we determined the proximate composition, amino acids, fatty acids and mineral elements of roes of Salmon solar, Exocoetidae cypselurus, Pseudosciaena crocea, Acipenser baeri, A. gueldenstaedti, A. schrenckii and Huso dauricus. The results show that E. cypselurus roe had the highest moisture content (813.1 g·kg^–1), lowest ash content (16.0 g·kg^–1) and lowest crude protein content (133.5 g·kg^–1). A. schrenckii roe had the highest crude protein content (281.5 g·kg^–1) and crude fat content (166.3 g·kg^–1), and S. solar roe have the lowest crude fat content (54.9 g·kg^–1). The contents of total amino acids (27.67%) and delicious amino acids (9.31%) in A. gueldenstaedti roe were the highest. The amino acid score (AAS) of the seven kinds of roes were higher than the FAO/WTO standard except tryptophan, and the ratio of essential amino acids to total amino acids ranged from 41.34% to 43.89%. The contents of saturated fatty acids (SFA), monounsaturated fatty acids (MUFA) and polyunsaturated fatty acids (PUFA) in seven kinds of roes were 25.83%−35.41%, 21.39%−26.65% and 41.84%−47.77%, respectively, and the total amount of EPA+DHA ranged from 20.06% to 40.59%. The roes contain high contents of phosphorus (P), iron (Fe) and zinc (Zn). Thus, the roes of the seven species are rich in various nutrients. According to the contents of crude fat and unsaturated fatty acid as well as amino acid evaluation, the nutritional values of four sturgeon roes are better than those of the other three kinds of roes.