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J
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AOAC I
nternational
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99, N
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1, 2016
233
Table 4. MLT precision data for total vitamin E as TE
Sample
Adult nutritional
powder milk
protein-based
Infant formula powder
partially hydrolyzed
soy-based
SRM
1849a
a
Adult
nutritional
powder low fat
Infant formula
Infant
elemental
powder
Powder
soy-based
Powder
milk-based
RTF
milk-based
b
Year of interlaboratory test
2014
2014
2014
2014
2014
2014
2014
2014
No. of laboratories
15
15
15
15
15
15
15
15
No. of laboratories retained
after eliminating outliers
14
15
12
14
14
14
14
15
No. of outliers (laboratories)
1
0
3
1
1
1
1
0
No. of accepted results
28
c
30
24
c,d
28
d
28
d
28
d
28
d
30
Mean value
x
, mg/100 g RTF
13.30
2.27
209.24
1.95
1.79
1.94
2.01
2.22
Repeatability SD s
r
,
mg/100 g RTF
0.50
0.12
4.06
0.05
0.04
0.03
0.02
0.10
Reproducibility SD s
R
,
mg/100 g RTF
0.95
0.23
8.18
0.21
0.08
0.08
0.08
0.12
RSD
r
, %
3.74
5.46
1.94
2.71
2.07
1.32
0.81
4.70
RSD
R
, %
7.17
10.15
3.91
10.78
4.22
4.13
3.84
5.55
Repeatability limit r
(r = 2.8 × s
r
), mg/100 g RTF
10.46
15.28
5.44
7.58
5.79
3.70
2.27
13.17
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
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
Laboratory No.
Cis
Trans
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
Laboratory 1
2.56
2.70
43.47
46.68
46.03
49.38
Laboratory 2
2.55
2.18
47.96
37.63
50.51
39.80
Laboratory 3
3.06
2.32
52.54
39.76
55.60
42.08
Laboratory 4
3.39
3.20
60.76
50.04
64.15
53.24
Laboratory 5
2.50
2.63
40.60
43.45
43.10
46.08
Laboratory 6
2.28
2.01
38.06
38.98
40.34
40.99
Laboratory 7
4.07
2.62
62.54
43.91
66.61
46.53
Laboratory 8
3.18
2.93
38.38
49.62
41.56
52.55
Laboratory 9
3.13
12.10
39.57
35.78
42.70
47.88
Laboratory 10
2.33
2.18
44.52
35.77
46.85
37.96
Laboratory 11
1.69
2.45
31.58
45.08
33.28
47.53
Laboratory 12
2.36
1.88
38.81
31.05
41.17
32.93
Laboratory 13
1.62
3.12
29.09
47.49
30.70
50.61
Laboratory 14
8.04
4.31
58.14
64.81
66.18
69.12
Laboratory 15
2.05
1.84
27.46
33.38
29.51
35.22
185