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Thompson et al.:

J

ournal of

AOAC I

nternational

V

ol.

98, N

o.

6, 2015 

1717

Table 3. Calibration standards and PLOQ

Na, mg/L Mg, mg/L P, mg/L K, mg/L Ca, mg/L Mn, mg/L Fe, mg/L Cu, mg/L Zn, mg/L Cr,

μ

g/L Se,

μ

g/L Mo,

μ

g/L

Cal Blk

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

0.00

Cal Std 1

0.500 0.200 0.500 1.00

1.00 0

.00500 0.0500 0.00500 0.

0200 0.800 0.400 0.800

Cal Std 2

2.50

1.00

2.50

5.00

5.00 0.0250 0.250 0.0250 0.100 4.00

2.00

4.00

Cal Std 3

10.0

4.00

10.0

20.0

20.0 0.100 1.00 0.100 0.400 16.0

8.00

16.0

Cal Std 4

20.0

8.00

20.0

40.0

40.0 0.200 2.00 0.200 0.800 32.0

16.0

32.0

PLOQ, mg/L

a

0.25

0.10

0.25

0.50

0.50 0.0025 0.025 0.0025 0.010

0.4

0.2

0.4

PLOQ, mg/100 g

b

1.3

0.50

1.3

2.5

2.5

0.013

c

0.13

c

0.013

c

0.050

20

10

20

SMPRs, mg/100 g

d

10

3

15

10

20

0.001 0.01 0.001

0.1

20

10

20

a

 Units are µg/L for Cr, Mo, and Se.

b

 mg of Na, Mg, P, K, Ca, Mn, Fe, Cu, or Zn/100 g of reconstituted final product, or µg of Cr, Mo, or Se/kg of reconstituted final product for a typical

dilution factor of 50:1.0 g RTF product or reconstituted powder/50 mL final volume.

c

 Note that the PLOQs for Mn, Fe, and Cu (in boldface) do not meet SMPR requirements.

d

 mg of Na, Mg, P, K, Ca, Mn, Fe, Cu, or Zn/100 g of reconstituted final product, or µg of Cr, Mo, or Se/kg of reconstituted final product.

Table 4. Summary of results for RSD

ip

in 11 SPIFAN matrixes tested in duplicate over 8 days (results were collected in

terms of “per kg” as-is for powders in this case, rather than the default SPIFAN units of mg/100 g or μg/100 g reconstituted

product)

Matrix/SPIFAN No.

Parameter

Na

Mg

P

K

Ca

Cr

a

Mn

Fe

Cu

Zn

Se

a

Mo

a

A-RTF, high fat

00406RF00

b

Mean, mg/kg 1390 398 1010 2360 888 141 4.80 21.5 2.37 27.9 133 193

RSD, % 2.0 1.8

2.9

1.7

9.4

1.8

4.8

3.6

3.0

1.4

3.6

2.6

A-RTF, high protein

00414RF00

Mean, mg/kg 1020 330 951 1560 983 130 4.22 18.7 1.81 22.0 92.6 154

RSD, % 1.9 3.4

3.4

3.9

2.8

2.9

2.1

3.4

3.0

2.4

3.0

3.2

AP, milk protein

11750017V3

c

Mean, mg/kg 2270 430 2140 5810 2820 142 5.30 43.8 11.5 52.4 219 294

RSD, % 2.2 3.3

2.4

1.7

2.3

5.0

2.6

4.0

3.3

2.6

2.8

4.9

AP, low fat

00394RF00

Mean, mg/kg 2070 1130 2710 5060 2740 428 14.0 59.8 6.34 62.1 268 565

RSD, % 2.8 2.9

1.8

2.1

2.7

1.3

2.7

3.5

3.3

2.6

3.2

3.0

PP

00412RF00

d

Mean, mg/kg 1460 741 3490 5500 3790 271.9 7.62 57.7 5.15 37.6 213 261

RSD, % 2.6 2.5

2.0

2.5

1.8

1.3

1.4

3.2

3.7

1.7

2.9

5.1

IP, elemental

00403RF00

e

Mean, mg/kg 2410 489 4560 7970 6310 215 4.67 105 7.20 64.6 209 160

RSD, % 3.0 3.3

2.4

3.1

2.2

6.3

1.3

1.9

1.7

2.1

2.8

7.5

IP, milk

D04HTCVV

Mean, mg/kg 1870 565 2800 6750 4690 44.3 1.05 116 5.43 65.9 230 159

RSD, % 3.2 2.9

1.7

3.3

2.5

7.7

2.0

2.0

4.9

1.5

3.8

8.2

IP, milk, partially

hydrolyzed

1172572116

Mean, mg/kg 1560 377 2310 6450 4190 21.4 1.05 83.7 4.90 43.4 239 184

RSD, % 1.8 2.6

4.4

1.1

2.2 20.2 2.6

3.1

3.9

2.6

2.7

4.0

IP, soy, partially

hydrolyzed

117257651Z

Mean, mg/kg 2470 604 3950 7400 6480 53.6 2.30 111 4.88 49.2 242 297

RSD, % 2.9 2.9

3.6

2.2

2.2

9.2

2.6

2.5

3.9

1.8

4.1

3.6

I-RTF, soy

E29JVLV

f

Mean, mg/kg 2301.3 726 4250 7540 6470 72.5 3.31 114 5.40 73.9 223 328

RSD, % 2.4 2.8

5.0

2.6

3.5

5.2

2.3

2.4

4.1

2.3

3.3

4.5

I-RTF, milk

control

Mean, mg/kg 179 59.4 298 1000 598 7.61 0.153 14.3 0.579 7.17 29.6 16.9

RSD, % 2.2 3.1

4.3

3.0

4.5 52.7 2.9

4.3

3.5

2.1

2.9 10.0

a

 Concentrations in μg/kg.

b

 A-RTF = Adult ready-to-feed formula.

c

 AP = Adult powder formula.

d

 PP = Pediatric powder formula.

e

 IP = Infant powder formula.

f

 I-RTF = Infant ready-to-feed formula.

76