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. Author manuscript; available in PMC: 2008 Nov 24.
Published in final edited form as: J AOAC Int. 2008;91(3):511–523.

Table 3.

Collaborative study results for determination of aflatoxinsa and ochratoxin A in blind duplicates of spiked and naturally contaminated powdered ginger samples

Lab No. AFB1
 AFB2
 AFG1
 AFG2
 AF
 OTA
0 μg/kg 0 μg/kg 0 μg/kg 0 μg/kg 0 μg/kg 0 μg/kg
1 NDb ND ND ND ND ND ND ND ND ND ND ND
2 0.45 0.45 0.15 0.15 0.25 0.25 0.11 0.11 ND ND ND ND
4 ND ND ND ND ND ND ND ND ND ND ND ND
5 ND ND ND ND ND ND ND ND ND ND ND ND
6 ND ND ND ND ND ND ND ND ND ND ND ND
10 ND ND ND ND ND ND ND ND ND ND ND ND
11 ND ND ND ND ND ND ND ND ND ND ND ND
12 ND ND ND ND ND ND ND ND ND ND ND ND
13 ND ND ND ND ND ND ND ND ND ND ND ND
14 ND ND ND ND ND ND ND ND ND ND ND ND
15
 ND
 ND
 ND
 ND
 ND
 ND
 ND
 ND
 ND
 ND
 ND
 ND
 
 1 μg/kg
 0.25 μg/kg
 0.5 μg/kg
 0.25 μg/kg
 2 μg/kg
 1 μg/kg
1 0.89 0.96 0.22 0.23 0.47 0.49 0.18 0.20 1.77 1.89 0.91 0.70
2 1.16c 1.16c 0.27c 0.30c 0.51 0.56 0.26 0.26 2.20 2.28 0.75 0.87
4 0.85 0.89 0.23 0.23 0.36 0.35 0.24 0.24 1.69 1.71 0.98 1.00
5 0.81 0.84 0.20 0.22 0.22 0.30 0.22 0.24 1.44 1.31 1.44b 1.31c
6 1.00 0.84 0.26 0.21 0.52 0.51 0.25d 0.17d 1.73 2.02 1.01 1.00
10 0.89 0.91 0.23 0.25 0.40 0.42 0.22 0.22 1.75 1.80 0.99 0.95
11 0.93 0.89 0.24 0.21 0.41 0.43 0.20 0.21 1.78 1.74 0.92 0.88
12 1.01 0.86 0.24 0.21 0.46 0.41 0.23 0.20 1.68 1.94 0.82 0.99
13 0.84 0.78 0.20 0.20 0.28 0.29 0.18 0.17 1.50 1.44 1.13 0.98
14 0.79 0.77 0.21 0.20 0.40 0.39 0.19 0.18 1.60 1.54 0.88 0.88
15
 0.92
 0.88
 0.24
 0.23
 0.43
 0.38
 0.23
 0.22
 1.83
 1.72
 0.99
 0.98
 
 2 μg/kg
 0.5 μg/kg
 1 μg/kg
 0.5 μg/kg
 4 μg/kg
 2 μg/kg
1 1.78 1.63 0.45 0.45 0.85 0.91 0.43 0.50 3.51 3.49 1.78 1.56
2 2.14c 1.91c 0.47 0.48 0.83 0.74 0.41 0.43 3.85 3.55 1.99 1.75
4 1.72 1.66 0.45 0.54 0.72 0.63 0.44 0.42 3.33 3.24 1.83 1.89
5 1.62 1.68 0.47 0.44 0.48 0.57 0.37 0.44 2.22 2.16 2.22 2.16
6 1.12c 1.55c 0.38 0.42 0.44 0.40 0.36 0.28 2.31 2.65 1.82 1.87
10 1.75 1.73 0.48 0.47 0.79 0.77 0.37 0.36 3.39 3.33 1.89 1.79
11 1.52 1.56 0.38 0.45 0.61 0.71 0.31 0.35 2.82 3.06 1.59 1.72
12 1.78 1.74 0.45 0.44 0.81 0.74 0.44 0.40 3.48 3.33 1.80 1.81
13 1.67 1.42 0.44 0.37 0.60 0.50 0.38 0.33 3.10 2.62 2.01 1.99
14 1.64 1.68 0.43 0.44 0.75 0.80 0.42 0.43 3.24 3.35 1.78 1.78
15
 1.61
 1.58
 0.45
 0.45
 0.70
 0.80
 0.44
 0.44
 3.19
 3.28
 1.90
 1.93
Natural contamination
1 8.88 8.25 0.96 0.90 10.75 10.25 1.47 1.36 20.75 22.06 7.50 7.15
2 8.64 7.58 0.76 0.68 4.01 3.53 1.22 1.29 14.64 13.07 8.57 9.18
4 8.70 10.22 0.863d 1.26d 6.81 7.93 1.05 1.34 20.74 17.42 9.70 9.15
5 7.98 8.58 0.92 1.01 2.49 3.25 0.67 0.72 9.11 8.37 9.11 8.37
6 6.17c 5.78c 0.65 0.62 2.02 1.49 0.50 0.42 9.33 8.31 10.08 10.18
10 11.13c 9.35c 1.17 0.94 10.73 9.32 1.59 1.34 24.60 20.95 9.35 9.63
11 8.52 7.48 0.82 0.78 6.07 6.89 0.78 1.04 16.18 16.19 10.4d 7.69d
12 9.09 7.75 0.81 0.74 8.10 6.92 0.95 0.91 16.32 18.95 7.93 8.58
13 7.62 7.94 0.81 0.74 3.92 6.02 0.70 1.07 13.04 15.77 9.18 10.40
14 8.80 8.16 0.82 0.81 7.71 7.46 1.09 1.03 18.42 17.47 7.94 8.84
15
 8.86
 8.93
 0.89
 0.86
 7.39
 6.17
 1.06
 1.04
 18.20
 16.99
 9.64
 10.02
 
 8 μg/kg
 2 μg/kg
 4 μg/kg
 2 μg/kg
 16 μg/kg
 8 μg/kg
1 6.50 6.45 1.72 1.74 3.29 3.26 1.75 1.69 13.15 13.26 7.06 5.95
2 6.77 6.72 1.76 1.84 2.81 2.78 1.38 1.47 12.71 12.81 7.22 8.18
4 6.55 6.67 1.72 1.75 2.55 2.62 1.50 1.56 12.32 12.60 6.81 6.87
5 5.97 6.15 1.71 1.76 1.73 1.78 1.36 1.38 7.86c 7.54c 7.86 7.55
6 5.20 5.76 1.45 1.61 1.07 1.06 0.93 1.04 8.65c 9.47c 7.11 7.77
10 6.70 7.11 1.80 1.92 2.99 3.09 1.62 1.77 13.11 13.89 6.73 7.08
11 5.85 6.28 1.63 1.64 2.27 2.29 1.40 1.38 11.15 11.60 6.76d 0.68d
12 6.78 6.96 1.70 1.77 3.06 3.05 1.62 1.66 13.43 13.16 7.18 7.22
13 6.59 6.52 1.74 1.70 2.50 2.66 1.45 1.54 12.28 12.42 7.71 7.42
14 6.59 6.62 1.74 1.76 3.01 3.08 1.66 1.64 13.00 13.10 7.04 6.99
15 6.75 6.95 1.83 1.90 2.96d 3.30d 1.78 1.84 13.32 13.99 7.66 8.02
a

AF = Sum of AFB1, AFB2, AFG1, and AFG2.

b

ND = None detected.

c

Grubbs outlier.

d

Cochran outlier.