AOACSPIFANMethods-2017Awards

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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 Infant powder soy

16.6 19.1 17.6 17.1 17.3

101.3

2.0 5.2 5.8 6.2 6.4 0.7 3.0 4.7 7.7 4.3 NA b

97.8 92.8 96.8 98.8 98.9 90.5

1.7 6.7 3.5 4.4 3.2 6.9 6.0 2.3 4.0 2.4 2.8

95.8 95.7 94.0 97.0

Infant powder milk part hydrolyzed Infant powder soy part hydrolyzed

Adult powder low fat Adult powder milk Child formula powder Infant elemental powder

5.44 8.42

100.3 100.1

99.2

Infant RTF milk

21.42 48.35 53.20

102.2 102.4 104.2

99.3

Adult RTF high protein

101.1

Adult RTF high fat

97.4 97.6

Mean

99.6

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 Infant powder soy

1.71

98.3 97.4 99.6 96.8

2.2 1.0 4.1 1.6 3.4 0.6 2.1 3.4 4.0 1.6 4.8 2.5 4.6 8.0 3.9 4.5 4.1 2.8 6.1 2.3 5.1 6.7

96.2 98.6 98.0 98.9 99.4 98.8 97.5 95.5 95.8 98.7 98.0 97.8 90.7 95.3 91.1 91.1 96.0 97.0 98.3 95.9 98.7 98.4 95.9 95.3

2.4 1.9 4.7 1.7 1.1 0.6 4.2 3.2 4.0 1.7 2.0 4.4 3.0 5.0 4.2 5.2 2.0 3.2 3.9 1.9 2.3 1.0

0.898

Infant powder milk part hydrolyzed Infant powder soy part hydrolyzed

1.12 1.01 0.00 0.00 5.39 1.51 2.68 15.5 21.6 1.69 0.90 1.10 1.00 0.00 0.00 5.42 1.53 2.65 15.5 21.5

Adult powder low fat Adult powder milk Child formula powder Infant elemental powder

102.3 100.6 100.2 100.2

Infant RTF milk

99.7 97.3 97.5 99.1

Adult RTF high protein

Adult RTF high fat

Mean

Acetycarnitine (determined separately)

Infant powder milk Infant powder soy

103.0

96.7 94.9 94.6 98.6 96.0 97.8

Infant powder milk part hydrolyzed Infant powder soy part hydrolyzed

Adult powder low fat Adult powder milk Child formula powder Infant elemental powder

100.1 101.7

Infant RTF milk

Adult RTF high protein

92.8 98.4 97.7

Adult RTF high fat

Mean