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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.