OMB Meeting Book - Jan. 11, 2018

106 H ALBMAYR -J ECH ET AL . : J OURNAL OF AOAC I NTERNATIONAL V OL . 98, N O . 1, 2015

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FAPAS 2795 A FAPAS 2795 B

51.3

58.5

43.4

71.4

<4

Negative

Negative

Negative

Caution : Wear protective gloves and safety glasses. The stop solution contains acid. Avoid contact with skin or eyes. ,I H[SRVHG ÀXVK ZLWK ZDWHU see Material Safety Data Sheet). The extraction solution contains chemicals which are harmful to health. Perform sample extraction under a chemical hood and avoid contact with skin. Dispose of all materials, containers, and devices appropriately after use. See Table 2014.03A for results of the interlaboratory study supporting acceptance of the method. A. Principle The method is based on an enzyme immunoassay format using a monoclonal G12 antibody that can determine gluten derived from wheat, rye, barley, and cross-bred varieties. The G12 antibody binds to the celiac toxic amino acid sequence

by each laboratory. All optical density (OD) values had to be recorded in a ready-to-use Excel sheet. The participants used the calculator, which was provided with the Excel sheet. The model ZDV D VLPSOH OLQHDU SRLQW WR SRLQW FDOFXODWLRQ 7KH ¿QDO GDWD IURP the laboratories were sent to the study coordinator. A statistical evaluation was performed according toAOAC guidelines (9, 10).

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Parameter

Symbol

1

2

3

4

5

6

7

8

9

10 11 12

Total No. laboratories

P 17 18 18 18 16 18 18 16 17 18 18 18

Total No. replicates

Sum [n(L)]

34 36 36 36 32 36 36 32 34 36 36 36

Overall mean of all data (grand mean; mg/kg) Repeatability SD, mg/kg

xbarbar

1.6 13.5 26.2 101.2 0.1 6.2 13.1 63.5 4.1 14.9 26.6 112.7

s r 0.8 2.5 8.1 14.8 1.2 1.2 1.3 5.1 1.9 1.5 4.3 20.4 s R 1.9 4.0 11.6 31.8 1.2 1.8 2.5 13.5 2.8 4.5 8.9 33.2 48.2 18.5 30.7 14.7 2348 19.2 10.2 8.0 46.2 10.4 16.2 18.1

Reproducibility SD, mg/kg

Repeatability RSD, %

RSD r RSD R

115.8 29.6 44.2 31.4 2348 28.3 19.1 21.2 69.0 30.3 33.6 29.4

Reproducibility RSD, %

Bias (mg/kg) observed-nominal

1.6 3.5 6.2 1.2 0.1 –3.8 –6.9 –36.5 –0.4 –0.1 2.6 10.7

Recovery, % = observed/nominal × 100

135.0 131.0 101.2

62.0 65.5 63.5 91.1 99.3 110.8 110.5

a

*OXWHQ IUHH ULFH ÀRXU ULFH ÀRXU PJ JOXWHQ NJ JOXWHQ IUHH FKRFRODWH FDNH 6 = chocolate cake 10 mg gluten/kg; 7 = chocolate cake 20 mg gluten/kg; 8 = chocolate cake 100 mg gluten/kg; 9 = crisp bread 4.5 mg gluten/kg; 10 = crisp bread 15 mg gluten/kg; 11 = crisp bread 24 mg gluten/kg; and 12 = crisp bread 102 mg gluten/kg. PJ JOXWHQ NJ ULFH ÀRXU PJ JOXWHQ NJ ULFH ÀRXU