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M c M ahon : J ournal of AOAC I nternational V ol . 99, N o . 1, 2016  233

Table 4. MLT precision data for total vitamin E as TE

Infant formula

Adult nutritional powder low fat

Adult nutritional powder milk protein-based

Infant elemental powder

Infant formula powder partially hydrolyzed soy-based

Powder soy-based

Powder milk-based

RTF milk-based b

SRM 1849a a

Sample

Year of interlaboratory test

2014

2014

2014

2014

2014

2014

2014

2014

No. of laboratories

15 14

15 15

15 12

15 14

15 14

15 14

15 14

15 15

No. of laboratories retained  after eliminating outliers No. of outliers (laboratories)

1

0

3

1

1

1

1

0

28 d

28 c

24 c,d

28 d

28 d

28 d

30

30

No. of accepted results

13.30

2.27 0.12

209.24

1.95 0.05

1.79 0.04

1.94 0.03

2.01 0.02

2.22 0.10

Mean value x , mg/100 g RTF

Repeatability SD s r ,  mg/100 g RTF Reproducibility SD s R ,  mg/100 g RTF

0.50

4.06

0.95

0.23

8.18

0.21

0.08

0.08

0.08

0.12

, %

3.74 7.17

5.46

1.94 3.91 5.44

2.71

2.07 4.22 5.79

1.32 4.13 3.70

0.81 3.84 2.27

4.70 5.55

RSD r RSD R

, %

10.15 15.28

10.78

10.46

7.58

13.17

Repeatability limit r  (r = 2.8 × s r Reproducibility limit R  (R = 2.8 × s R

), mg/100 g RTF

20.09

28.43

10.94

30.19

11.81

11.57

10.74

15.53

), mg/100 g RTF

HorRat value

0.93

1.00

0.27

1.04

0.68

0.40

0.37

0.55

a  Milligrams per kilogram powder. b  RTF = Ready-to-feed.

c  Grubbs test outlier. d  Cochran test outlier.

Table 5. Collaborative data for adult nutritional powder milk protein-based

Cis Total vitamin A as RE (retinol equivalents) μg/100 g RTF μg/100 g RTF μg/100 g RTF μg/100 g RTF μg/100 g RTF μg/100 g RTF Trans

Laboratory No. Laboratory 1 Laboratory 2 Laboratory 3 Laboratory 4 Laboratory 5 Laboratory 6 Laboratory 7 Laboratory 8 Laboratory 9 Laboratory 10 Laboratory 11 Laboratory 12 Laboratory 13 Laboratory 14 Laboratory 15

2.56 2.55 3.06 3.39 2.50 2.28 4.07 3.18 3.13 2.33 1.69 2.36 1.62 8.04 2.05

2.70 2.18 2.32 3.20 2.63 2.01 2.62 2.93 2.18 2.45 1.88 3.12 4.31 1.84

43.47 47.96 52.54 60.76 40.60 38.06 62.54 38.38 39.57 44.52 31.58 38.81 29.09 58.14 27.46

46.68 37.63 39.76 50.04 43.45 38.98 43.91 49.62 35.78 35.77 45.08 31.05 47.49 64.81 33.38

46.03 50.51 55.60 64.15 43.10 40.34 66.61 41.56 42.70 46.85 33.28 41.17 30.70 66.18 29.51

49.38 39.80 42.08 53.24 46.08 40.99 46.53 52.55 47.88 37.96 47.53 32.93 50.61 69.12 35.22

12.10