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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

87