Abstract:

This study was performed to determine the content and constituents of amino acids in fruits of Chinese Date (Zizyphus jujuba Mill) from North Shaanxi Province, so as to provide the scientific basis for utilization of those materials and further research. In order to provide information for amino acids were extracted using the hydrochloric acid hydrolysis method, and contents of amino acids and their constituents were determined on an automatic amino acid analyzer. From each type of tissues, 16 amino acids were identified, and the mean total amino acid content were (4.57±0.60) mg/100 g, and the variation coefficient were 0.75. Among them, there were 7 kinds of essential amino acids for human nutrients; the mass fraction (% in total amino acid) of essential amino acids for humans was 20.35%±4.14%. 2 kinds of essential amino acids for children and mass fraction of essential amino acids for children was 2.43%±0.46%. 9 kinds of medicinal amino acids mass fraction of medicinal amino acids was 36.17%±2.98%. 6 kinds of aromatic amino acids and the mass fraction of aromatic amino acids was 17.33%±3.61%. 4 kinds of umami tasty amino acids and the mass fraction of umami amino acids was 22.71%±3.94%. 4 kinds of sweetness amino acids and the mass fraction of branched-chain amino acids was 58.48%±3.09%. 3 kinds of branched amino acids and the mass fraction of branched-chain amino acids was 7.15%±0.48%. And the ratio of branched amino acids/ aromatic amino acids was 42.98%±9.37%. In Chinese jujube have contained at least 16 amino acid, they content were rich, especially in taste amino acids, ratio of branched amino acids/ aromatic amino acids, pharmacodynamic amino acids and essential amino acids composition of the was higher, was to give the jujube sweet delicious unique flavor and good health tonic the main characteristics of internal factors. These results for jujube width and depth of the development and utilization of laid an important foundation.