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Jaudzems:
J
ournal of
AOAC I
nternational
V
ol.
98, N
o.
5, 2015
1391
Table 2015.08A. Precision of results expressed on reconstituted product
Matrix
a
Chloride mean, mg/100 g
RSD
r
, %
b
RSD
R
, %
c
NIST SRM 1849a
68.5
0.42
1.59
Child formula powder
46.1
0.26
0.32
Infant elemental powder
36.8
0.10
0.12
Adult nutritional RTF, high protein
38.2
0.64
2.76
Adult nutritional RTF, high fat
30.8
2.77
10.09
d
Infant formula RTF, milk based (SPIFAN blank milk formula)
20.0
0.22
0.18
Adult nutritional powder milk, protein based
36.4
0.45
0.47
Infant formula powder partially hydrolyzed, milk based
42.4
0.09
0.13
Infant formula powder partially hydrolyzed, soy based
46.2
0.15
0.16
Adult nutritional powder low fat
40.3
0.20
0.18
Child formula powder
38.6
0.67
0.81
Infant elemental powder
39.3
0.21
0.23
Infant formula powder, milk based
46.5
0.88
0.85
Infant formula powder, soy based
56.1
0.29
0.33
Infant formula RTF, milk based (SPIFAN control milk formula)
44.2
0.34
0.24
Adult nutritional RTF, high protein
154.5
0.44
0.40
Adult nutritional RTF, high fat
162.2
1.01
0.78
a
Samples provided in the SPIFAN I Test Kit. SRM 1849a was reconstituted 10 g to 100 g, and all other powders were reconstituted
25 g to 225 g.
b
RSD
r
= Repeatability RSD.
c
RSD
R
= Reproducibility RSD.
d
Higher repeatability and intermediate reproducibility were observed in this nonfortified RTF sample compared to the rest of the samples.
This is most likely due to sample heterogeneity, since the sample was beyond its expiration date. The sample contents separated even after
15 min shaking prior to opening. These results were not included in the evaluation. Additional high-fat sample was within the SMPR
requirements.
Table 2015.08B. Recovery results of spiking experiments for chloride
+ 50% of native value
+ 100% of native value
Matrix
Native chloride, mg/100 g Average, % RSD, % Average, % RSD, %
SRM NIST 1849a
68.5
104.0
2.8
103.0
1.3
Child formula powder
46.1
102.0
2.1
100.0
1.5
Infant elemental powder
36.8
101.0
1.5
101.0
1.5
Infant formula RTF, milk based (SPIFAN blank milk formula)
20.0
103.0
1.2
101.0
1.1
Adult nutritional powder, milk protein based
36.4
101.0
1.2
100.0
0.7
Infant formula powder partially hydrolyzed, milk based
42.4
101.0
1.0
100.0
1.8
Infant formula powder partially hydrolyzed, soy based
46.2
102.0
1.4
100.0
1.5
Adult nutritional powder low fat
40.3
102.0
1.6
101.0
1.8
Child formula powder
38.6
101.0
1.5
100.0
1.3
Infant elemental powder
39.3
100.0
1.9
101.0
1.2
Infant formula powder, milk based
46.5
100.0
0.5
100.0
0.9
Infant formula powder, soy based
56.1
101.0
1.2
100.0
0.4
Infant formula RTF, milk based (SPIFAN control milk formula)
44.2
103.0
3.2
99.0
1.0
Adult nutritional RTF, high protein
154.5
101.0
0.2
100.0
0.5
Adult nutritional RTF, high fat
162.2
102.0
1.6
103.0
1.9
Candidates for 2016 Method of the Year
100