Sweet lupin protein quality in young men.
The protein quality of Lupinus albus cv Multolupa was evaluated in young adult males using the nitrogen balance technique at graded levels of N intake, and compared with egg protein. Lupin protein was consumed at levels of 0.4, 0.6 and 0.8 g/(kg.d) and egg protein at 0.3, 0.45 and 0.6 g/(kg.d). Each period started with 1 d of consuming a protein-free diet; the next 6 d were used as adaptation and the last 4 d for balance. The levels of protein intake were randomly assigned by a modified Latin square. Energy intake was individually adjusted. Mean apparent N digestibility values of lupin protein were 78.8, 76.1 and 70.2% for the levels of 0.8, 0.6 and 0.4 g protein(kg.d), respectively, and 83.8, 78.3 and 67.1% for egg protein consumed at levels of 0.6, 0.45 and 0.3 g protein/(kg.d), respectively. The N balance results obtained when subjects consumed lupin were 16.4, 0.2 and -15.1 mg N/(kg.d) for protein intakes of 0.8, 0.6 and 0.4 g/(kg.d), respectively. Those obtained for egg consumption were 12.6, -3.6 and -17.1 mg N/(kg.d) for protein intakes of 0.6, 0.45 and 0.3 g/(kg.d), respectively. The linear regressions of intake and absorbed N to retained N for lupin were: N retained = -43.41 + 0.50 N intake and N retained = -36.30 + 0.53 N absorbed. The corresponding regressions for egg were: N retained = -45.0 + 0.65 N intake and N retained = -30.65 + 0.58 N absorbed. The net protein utilization of lupin was 77% that of egg protein.
Egaña
J I
JI
Instituto de Nutrición y Tecnología de los Alimentos, Universidad de Chile, Santiago.
Uauy
R
R
Cassorla
X
X
Barrera
G
G
Yañez
E
E
D000293:Adolescent; D000328:Adult; D004044:Dietary Proteins / Q000008:administration & dosage*; D004063:Digestion; D015387:Egg Proteins, Dietary / Q000008:administration & dosage; D002149:Energy Intake; D007887:Fabaceae; D006801:Humans; D008297:Male; D009584:Nitrogen / Q000008:administration & dosage / Q000378:metabolism; D009753:Nutritive Value; D010946:Plants, Medicinal; D012044:Regression Analysis
D004044:Dietary Proteins; D015387:Egg Proteins, Dietary; D009584:Nitrogen