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Table 4 Parameters of Phe kinetics following oral administration of a bolus dose of L-[1- 13 C]Phe

From: Phenylalanine flux and gastric emptying are not affected by replacement of casein with whey protein in the diet of adult cats consuming frequent small meals

  Oral Pooled SEM P
Casein Whey
rMSPE (% of mean) 10.9 12.4 3.0 0.74
AIC 42.4 42.6 7.4 0.91
kP (/min) 0.039 0.063 0.015 0.36
kel (/min) 0.027 0.027 0.003 0.74
kemp (/min) 0.115 0.127 0.053 0.99
first-pass extraction (%) 51.3 48.5 3.8 0.64
gastric emptying half-time (min) 9.9 10.3 1.7 0.87
Phe flux (μmol/(h · kg)) 45.3 46.5 4.7 0.85
  1. Data are means from 8 cats per treatment. rMSPE, root mean square prediction error; AIC, Akaike’s information criterion; kP, rate constant for reversible exchange between plasma and tissue pools; kel, rate constant for irreversible elimination from circulation; kemp, gastric emptying constant.