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1718

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.

77