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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

Spike recovery

Spike level 1 (50%)

Spike level 2 (100%)

Native concn (RTF or reconstituted, mg/100 g)

Product a

Avg., %

RSD, %

Avg., % RSD, %

Two replicates in 3 different days  Adult RTF, high-fat b

162 70.9 38.2 35.3 57.4 45.7 39.2 157 40.3 46.8 162 70.9 38.2 35.3 57.4 45.7 39.2 157 40.3 46.8 162 70.9 38.2 35.3 57.4 45.7 39.2 157 40.3 46.8 162 70.9 38.2 35.3 57.4 45.7 39.2 157 40.3 46.8

101.2 101.8 102.2 101.7 101.8 101.4 100.9 101.3 102.0 101.5 101.0 101.8 102.3 101.5 101.5 100.3 100.7 101.4 101.7 102.6 101.5 101.3 102.9 102.1 102.8 101.8 101.2 100.8 102.2 100.9 101.2 102.4 101.5 101.4 101.0 102.1 100.7 101.6 102.2 101.2

0.98 1.32 0.98 1.50 0.94 0.91 0.76 0.75 0.80 1.21 1.40 1.75 0.95 2.16 0.02 0.79 1.22 0.03 1.29 1.06 1.60 2.12 0.18 0.90 1.00 0.22 0.20 0.93 0.87 1.55 0.08 0.23 1.47 2.31 0.52 0.13 1.04 1.13 0.67 0.85

102.5 101.2 102.1 101.2 102.3 101.8 102.0 102.5 101.6 102.2 101.8 101.2 102.8 101.2 101.3 100.8 101.7 102.1 101.6 101.6 103.1 101.2 102.7 100.6 102.7 102.5 101.1 103.0 101.5 102.0 102.6 101.3 100.8 101.6 102.9 102.1 103.3 102.3 101.6 102.8

1.04 0.79 1.28 0.67 1.05 1.09 1.18 1.09 0.95 1.10 1.29 1.40 0.64 0.83 1.33 0.56 1.17 2.20 1.88 0.06 1.22 0.93 1.63 0.60 0.47 1.38 0.21 0.40 0.85 1.46 0.86 0.49 0.49 0.49 0.84 0.78 0.91 0.32 0.47 1.57

 SRM 1849a

 Pediatric powder

 Adult powder, milk-protein-based

 Infant powder, soy-based  Infant RTF, milk-based  Adult powder, low-fat  Adult RTF, high protein  Infant powder, elemental

 Infant powder, partially hydrolyzed soy-based

Day 1  Adult RTF, high-fat

 SRM 1849a

 Pediatric powder

 Adult powder, milk-protein-based

 Infant powder, soy-based  Infant RTF, milk-based  Adult powder, low-fat  Adult RTF, high protein  Infant powder, elemental

 Infant powder, partially hydrolyzed soy-based

Day 2  Adult RTF, high-fat

 SRM 1849a

 Pediatric powder

 Adult powder, milk-protein-based

 Infant powder, soy-based  Infant RTF, milk-based  Adult powder, low-fat  Adult RTF, high protein  Infant powder, elemental

 Infant powder, partially hydrolyzed soy-based

Day 3  Adult RTF, high-fat

 SRM 1849a

 Pediatric powder

 Adult powder, milk-protein-based

 Infant powder, soy-based  Infant RTF, milk-based  Adult powder, low-fat  Adult RTF, high protein  Infant powder, elemental

 Infant powder, partially hydrolyzed soy-based

a  Two samples each of the 10 SPIFAN matrixes were tested. b  RTF = Ready-to-feed.

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