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Jing et al.:
J
ournal of
AOAC I
nternational
V
ol.
98, N
o
. 5, 2015
1403
Table 7. Spike recovery of choline (ion) in SPIFAN matrixes at two different levels
Spike recovery
+40% Native
+80% Native
Product
Native level mg/100 g as RTF Avg., %
RSD, %
Avg., %
RSD, %
Infant powder milk
16.6
101.3
2.0
97.8
1.7
Infant powder soy
19.1
95.8
5.2
92.8
6.7
Infant powder milk part hydrolyzed
17.6
95.7
5.8
96.8
3.5
Infant powder soy part hydrolyzed
17.1
94.0
6.2
98.8
4.4
Adult powder low fat
17.3
97.0
6.4
98.9
3.2
Adult powder milk
<LOQ
a
<LOQ
NA
b
90.5
6.9
Child formula powder
5.44
104.1
0.7
100.3
6.0
Infant elemental powder
8.42
99.2
3.0
100.1
2.3
Infant RTF milk
21.42
102.2
4.7
99.3
4.0
Adult RTF high protein
48.35
102.4
7.7
101.1
2.4
Adult RTF high fat
53.20
104.2
4.3
97.4
2.8
Mean
99.6
97.6
a
Further spiking results with adult milk powder are given in Table
2014.04K
and
L
.
b
NA = Not applicable.
Table 8. Spike recovery of carnitine and acetylcarnitine in SPIFAN matrixes at two different levels
Spike recovery
+40% Native
+80% Native
Product
Native level mg/100 g as RTF Avg., % RSD, %
Avg., %
RSD, %
Carnitine
Infant powder milk
1.71
98.3
2.2
96.2
2.4
Infant powder soy
0.898
97.4
1.0
98.6
1.9
Infant powder milk part hydrolyzed
1.12
99.6
4.1
98.0
4.7
Infant powder soy part hydrolyzed
1.01
96.8
1.6
98.9
1.7
Adult powder low fat
0.00
102.3
3.4
99.4
1.1
Adult powder milk
0.00
100.6
0.6
98.8
0.6
Child formula powder
5.39
100.2
2.1
97.5
4.2
Infant elemental powder
1.51
100.2
3.4
95.5
3.2
Infant RTF milk
2.68
99.7
4.0
95.8
4.0
Adult RTF high protein
15.5
97.3
1.6
98.7
1.7
Adult RTF high fat
21.6
97.5
4.8
98.0
2.0
Mean
99.1
97.8
Acetycarnitine (determined separately)
Infant powder milk
1.69
103.0
2.5
90.7
4.4
Infant powder soy
0.90
96.7
4.6
95.3
3.0
Infant powder milk part hydrolyzed
1.10
94.9
8.0
91.1
5.0
Infant powder soy part hydrolyzed
1.00
94.6
3.9
91.1
4.2
Adult powder low fat
0.00
98.6
4.5
96.0
5.2
Adult powder milk
0.00
96.0
4.1
97.0
2.0
Child formula powder
5.42
97.8
2.8
98.3
3.2
Infant elemental powder
1.53
100.1
6.1
95.9
3.9
Infant RTF milk
2.65
101.7
2.3
98.7
1.9
Adult RTF high protein
15.5
92.8
5.1
98.4
2.3
Adult RTF high fat
21.5
98.4
6.7
95.9
1.0
Mean
97.7
95.3
129