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150
L
in
et al
.:
J
ournal of
AOAC I
nternational
V
ol
.
100, N
o
.
1, 2017
Table 3. Precision
Product
SPIFAN code No. replicates
a
Concn level, μg/100 g
reconstituted
RSD
r
, % RSD
iR
, %
b
Child Formula Powder, placebo
00847RF00
6
Not detected
NA
c
NA
Infant Elemental Powder, placebo
00796RF00
6
Not detected
NA
NA
Adult Nutritional RTF, High-Protein, placebo
00821RF00
6
Not detected
NA
NA
Adult Nutritional RTF, High-Fat, placebo
00820RF00
6
Not detected
NA
NA
Infant Formula RTF, Milk-Based, placebo
EV4H2Q
6
Not detected
NA
NA
SRM 1849a
CLC10-b
12
22.4
d
1.5
2.6
Infant Formula Powder, Partially Hydrolyzed Milk-Based 410057652Z
12
4.07
0.5
1.6
Infant Formula Powder, Partially Hydrolyzed Soy-Based 410457651Z
12
4.43
0.5
1.3
Toddler Formula Powder, Milk-Based
4052755861
12
10.7
1.9
4.5
Infant Formula Powder, Milk-Based
4044755861
12
2.90
2.5
3.3
Adult Nutritional Powder, Low-Fat
00859RF00
12
31.9
0.7
2.8
Child Formula Powder
00866RF00
12
21.6
1.2
1.8
Infant Elemental Powder
00795RF00
12
10.7
1.9
4.5
Infant Formula Powder, FOS/GOS-Based
e
50350017W1
12
1.66
2.6
4.1
Infant Formula Powder, Milk-Based
K16NTAV
12
5.11
1.2
3.0
Infant Formula Powder, Soy-Based
E10NWZC
12
5.15
3.0
4.0
Infant Formula RTF, Milk-Based
EV4H2R
12
3.86
1.7
4.1
Adult Nutritional RTF, High-Protein
00730RF00
12
56.8
1.0
3.4
Adult Nutritional RTF, High-Fat
00729RF00
12
76.2
0.6
3.1
a
Duplicates on 3 or 6 days.
b
RSD
iR
= Intermediate RSD
R
.
c
NA = Not applicable.
d
Reference value taken from the Certificate of Analysis of SRM 1849a.
e
FOS/GOS = Fructo-oligosaccharide/galacto-oligosaccharide.
Table 4. Accuracy: spike recovery
Product
SPIFAN code No. replicates
Spike recovery
Native level,
μg/100 g
reconstituted
Level 1 (~50%)
Level 2 (~150% for placebo,
~100% for fortified)
Avg., % (
n
= 3)
RSD, % Avg., % (
n
= 3)
RSD, %
Child Formula Powder,
placebo
00847RF00
6
Not detected
103
3.2
105
1.5
Adult Nutritional RTF,
High-Protein, placebo
00821RF00
6
Not detected
102
1.6
103
1.5
Adult Nutritional RTF,
High-Fat, placebo
00820RF00
6
Not detected
102
2.2
104
1.7
Infant Formula Powder,
Partially Hydrolyzed
Soy-Based
410457651Z
6
4.43
105
4.2
101
4.2
Adult Nutritional
Powder, Low-Fat
00859RF00
6
31.9
111
2.9
102
1.8
Child Formula Powder
00866RF00
6
21.6
109
2.8
104
1.7
Infant Elemental
Powder
00795RF00
6
10.7
106
2.8
95.1
3.0
Infant Formula Powder,
FOS/GOS-Based
a
50350017W1
6
1.66
105
6.4
99.9
7.2
Infant Formula Powder,
Milk-Based
K16NTAV
6
5.11
104
6.1
103
4.6
Adult Nutritional RTF,
High-Protein
00730RF00
6
56.8
109
1.6
102
0.8
Adult Nutritional RTF,
High-Fat
00729RF00
6
76.2
109
2.4
101
0.7
a
FOS/GOS = Fructo-oligosaccharide/galacto-oligosaccharide.
39