95 / 363
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.
Candidates for 2016 Method of the Year
94