Efficiency of utilization of soy protein isolate in Japanese young men

摘要: The nutritional quality of soy protein isolate (SPI) was evaluated in young men by the nitrogen balance method using fish as a standard. Twenty-one male university students were given SPI (Supro 620, Ralston Purina Co., St. Louis, Mo., U.S.A.), (cod fish) or 50: 50 mixture two proteins sole source protein. and prepared paste products (kamaboko). Four experimental periods used which each subject received 0.35, 0.45, 0.55 0.65 g protein/kg/day, respectively, random order. Each period consisted one day on protein-free diet ten days diet, with an interval three free-choice (ad libitum) between periods. Energy intake constant for individual to maintain their body weight (44.6±2.4 kcal/kg/day). linear regression equations obtained (X: mg N/kg/day) apparent (Y: follows: SPI, Y=0.298X-35.2; protein, Y=0.365X-31.8; mixed Y=0.423X-38.3. requirement maintenance equilibrium determined from equation 118.1±15.4 N/kg/day 87.1±17.2 90.5±17.1 NPUs calculated at respective intakes 38.9, 52.8 50.8 respectively. There no significant difference nutritive values value relative estimated 82%, 74% slope-ratio method, NPU,