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202

B

olong

et al

.:

J

ournal of

AOAC I

nternational

V

ol

.

99, N

o

.

1, 2016

Table 5. Recovery in SPIFAN matrixes and NIST SRM 1849a

Product

a

Native concn

(RTF or reconstituted, mg/100 g)

Spike recovery

Spike level 1 (50%)

Spike level 2 (100%)

Avg., %

RSD, %

Avg., % RSD, %

Two replicates in 3 different days

 Adult RTF, high-fat

b

162

101.2

0.98

102.5

1.04

 SRM 1849a

70.9

101.8

1.32

101.2

0.79

 Pediatric powder

38.2

102.2

0.98

102.1

1.28

 Adult powder, milk-protein-based

35.3

101.7

1.50

101.2

0.67

 Infant powder, soy-based

57.4

101.8

0.94

102.3

1.05

 Infant RTF, milk-based

45.7

101.4

0.91

101.8

1.09

 Adult powder, low-fat

39.2

100.9

0.76

102.0

1.18

 Adult RTF, high protein

157

101.3

0.75

102.5

1.09

 Infant powder, elemental

40.3

102.0

0.80

101.6

0.95

 Infant powder, partially hydrolyzed soy-based

46.8

101.5

1.21

102.2

1.10

Day 1

 Adult RTF, high-fat

162

101.0

1.40

101.8

1.29

 SRM 1849a

70.9

101.8

1.75

101.2

1.40

 Pediatric powder

38.2

102.3

0.95

102.8

0.64

 Adult powder, milk-protein-based

35.3

101.5

2.16

101.2

0.83

 Infant powder, soy-based

57.4

101.5

0.02

101.3

1.33

 Infant RTF, milk-based

45.7

100.3

0.79

100.8

0.56

 Adult powder, low-fat

39.2

100.7

1.22

101.7

1.17

 Adult RTF, high protein

157

101.4

0.03

102.1

2.20

 Infant powder, elemental

40.3

101.7

1.29

101.6

1.88

 Infant powder, partially hydrolyzed soy-based

46.8

102.6

1.06

101.6

0.06

Day 2

 Adult RTF, high-fat

162

101.5

1.60

103.1

1.22

 SRM 1849a

70.9

101.3

2.12

101.2

0.93

 Pediatric powder

38.2

102.9

0.18

102.7

1.63

 Adult powder, milk-protein-based

35.3

102.1

0.90

100.6

0.60

 Infant powder, soy-based

57.4

102.8

1.00

102.7

0.47

 Infant RTF, milk-based

45.7

101.8

0.22

102.5

1.38

 Adult powder, low-fat

39.2

101.2

0.20

101.1

0.21

 Adult RTF, high protein

157

100.8

0.93

103.0

0.40

 Infant powder, elemental

40.3

102.2

0.87

101.5

0.85

 Infant powder, partially hydrolyzed soy-based

46.8

100.9

1.55

102.0

1.46

Day 3

 Adult RTF, high-fat

162

101.2

0.08

102.6

0.86

 SRM 1849a

70.9

102.4

0.23

101.3

0.49

 Pediatric powder

38.2

101.5

1.47

100.8

0.49

 Adult powder, milk-protein-based

35.3

101.4

2.31

101.6

0.49

 Infant powder, soy-based

57.4

101.0

0.52

102.9

0.84

 Infant RTF, milk-based

45.7

102.1

0.13

102.1

0.78

 Adult powder, low-fat

39.2

100.7

1.04

103.3

0.91

 Adult RTF, high protein

157

101.6

1.13

102.3

0.32

 Infant powder, elemental

40.3

102.2

0.67

101.6

0.47

 Infant powder, partially hydrolyzed soy-based

46.8

101.2

0.85

102.8

1.57

a

 Two samples each of the 10 SPIFAN matrixes were tested.

b

 RTF = Ready-to-feed.

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