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“TRP concentrations were higher after α-lactalbumin than after gelatin with or without TRP from t = 0–100 min, whereas from t = 100–240 min, TRP concentrations were lower after gelatin than after α-lactalbumin and gelatin+TRP.”
“This suppression of the increase in glutathione was observed much more clearly when the gelatin diet was fortified with tryptophan in addition to cysteine.”
“The addition of tryptone resulted in SMA increases of 36% (R5), 17% (R20), 179% (Li), and 48% (Do), whereas added gelatine increased the SMA by 30% (R5), 14% (R20), 23% (Li), and 13% (Do).”
“It is 12 years since Krehl and coworkers (1, 2) reported that … young rats fed on low protein diets deficient in niacin and tryptophan was retarded when a … supplement such as gelatin or zein was added to the diet, and that … retardation was prevented if additional tryptophan was provided.”
The Journal of biological chemistry • 1958 | View Paper
“ Gelatin alone added to the basal diet causes very little plasma protein production but when supplemented by tryptophane gives a large protein output, while tryptophane alone is inert.”