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Thompson et al.:
J
ournal of
AOAC I
nternational
V
ol.
98, N
o.
6, 2015
Table 5. Precision and accuracy with SRM 1849a
Analyte
Units
SRM 1849a
Candidate method
Certified mean Certified range
n
Mean
Bias
Accuracy, % RSD
ir
, %
Na
mg/100 g
426.5
418.2–434.8
9
429
2.5
100.6
0.98
Mg
mg/100 g
164.8
161.2–168.4
9
163
–2.1
98.7
2.2
P
mg/100 g
399.0
385.0–413.0
9
430
30.6
107.7
1.4
K
mg/100 g
922.0
911.0–933.0
9
929
6.6
100.7
1.9
Ca
mg/100 g
525.3
520.2–530.4
9
534
8.7
101.7
1.4
Cr
μg/100 g
107.2
104.0–110.4
9
105
–2.5
97.7
2.3
Mn
mg/100 g
4.959
4.8–5.056
9
4.85
–0.1
98.6
2.1
Fe
mg/100 g
17.56
17.27–17.85
9
17.4
–0.2
99.1
1.2
Cu
mg/100 g
1.978
1.952–2.004
9
1.93
–0.1
97.6
2.7
Zn
mg/100 g
15.1
14.54–15.66
9
15.4
0.3
102.0
2.0
Se
μg/100 g
81.2
78.3–84.1
9
81.7
0.5
100.6
1.0
Mo
μg/100 g
170.7
166.7–174.7
9
164
–6.5
96.2
1.2
Table 6. Recovery in SPIFAN matrixes
Matrix/
SPIFAN No.
Parameter
Na
Mg
P
K
Ca
Cr
Mn
Fe
Cu
Zn
Se
Mo
A-RTF, high fat
00406RF00
a
Recovery, % 100.2 99.2 109.0 105.1 104.1 98.0 99.7 99.3 105.7 108.0 105.2 93.3
RSD, % 4.4
9.0
2.8
8.2 14.1 2.8
8.0
9.1
6.3 11.4 7.0
3.1
A-RTF, high protein
00414RF00
Recovery, % 105.2 92.8 100.2 92.4 98.6 98.0 94.3 97.3 91.3 94.1 103.6 92.0
RSD, % 5.9
9.9
5.5 11.1 8.4
2.5
4.4
8.1
4.1
2.8
4.9
2.7
AP, milk protein
11750017V3
b
Recovery, % 105.4 104.2 100.0 102.6 100.7 103.7 99.5 98.3 104.6 97.4 102.8 97.4
RSD, % 2.7
4.0
2.9
1.3
4.2
1.6
5.6
3.7
1.4
4.1
4.1
4.6
AP, low fat
00394RF00
Recovery, % 102.8 102.0 98.1 107.9 99.6 100.5 100.5 98.8 99.3 97.3 99.3 95.4
RSD, % 5.5
8.3
6.8
5.3
8.0
4.8
4.8
7.4
4.0
5.3
3.3
8.1
PP
00412RF00
c
Recovery, % 105.6 104.0 106.2 104.6 103.2 101.5 95.3 101.1 95.3 98.0 103.6 96.2
RSD, % 6.8
9.8
3.2 10.6 7.5
2.5
0.7
2.2
0.7
1.1
4.8
2.1
IP, elemental
00403RF00
d
Recovery, % 105.7 100.2 107.3 99.2 101.1 101.5 99.6 99.8 99.4 97.0 105.5 96.9
RSD, % 10.8 4.5
1.3 10.4 12.5 8.8
5.6
5.2
1.4
3.8
4.6
2.7
IP, milk
D04HTCVV
Recovery, % 102.2 100.8 102.2 104.4 98.6 108.8 99.6 98.4 89.8 98.9 105.6 92.5
RSD, % 4.5
9.0
6.8 16.0 3.5 10.3 5.5
4.6
2.1
3.2
4.7
2.5
IP, milk, partially
hydrolyzed
1172572116
Recovery, % 101.3 103.5 101.5 100.5 98.4 90.1 98.9 97.1 102.4 96.8 99.5 95.2
RSD, % 2.3
5.2
6.8
7.1
8.6
1.1
7.0
6.3
8.6
5.8
2.3
5.7
IP, soy, partially
hydrolyzed
117257651Z
Recovery, % 99.8 103.3 100.1 98.0 100.2 91.0 101.2 96.8 97.8 95.2 101.2 107.9
RSD, % 3.6 11.3 2.7
6.6
9.7
3.0
0.6
6.5
4.8
4.5
2.3
1.0
I-RTF, soy
E29JVLV
e
Recovery, % 105.6 103.3 107.6 110.2 102.5 107.8 94.9 96.9 93.8 95.4 102.9 93.1
RSD, % 7.6
8.8
5.3 11.8 11.8 1.5
3.5
4.6
1.0
2.7
6.0
1.2
I-RTF, milk
control
Recovery, % 103.2 93.0 99.9 108.4 90.2 103.3 93.5 92.8 91.7 93.0 100.7 92.3
RSD, % 5.3
2.7
2.9 13.5 4.0
6.1
2.2
3.8
2.9
1.5
4.9
5.4
a
A-RTF = Adult ready-to-feed formula.
b
AP = Adult powder formula.
c
PP = Pediatric powder formula.
d
IP = Infant powder formula.
e
I-RTF = Infant ready-to-feed formula.
Candidates for 2016 Method of the Year
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