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780 Bird et al.: Journal of AOAC International Vol. 98, No. 3, 2015
Table 8. Total yeast and mold log
10
counts for raw almonds by 3M Petrifilm RYM Count Plate after 48 h incubation at 28
°C versus FDA BAM (ref. 1) and ISO 21527 (ref. 2)
reference methods
a
Uninoculated control
Low
Medium
High
Petrifilm RYM FDA BAM/ISO 21527
b
Petrifilm RYM FDA BAM/ISO 21527
Petrifilm RYM
FDA BAM/ISO 21527
Petrifilm RYM FDA BAM/ISO 21527
g
Lab
A
c
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
1
1.00
d
1.00
d
1.00
d
<1.00
1.30
1.48
1.78
1.85
1.78
1.90
2.28
1.95
1.90
e
2.20
e
2.04
f
2.40
f
2
1.30
d
1.30
d
1.30
d
1.85
d
1.78
1.60
2.04
1.70
1.78
1.78
2.11
2.34
2.11
e
2.11
e
2.64
2.84
3
<1.00
<1.00
<1.00
<1.00
1.78
1.30
1.60
1.60
2.34
2.30
2.38
2.18
3.57
3.15
3.30
3.11
4
g
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
5
<1.00
<1.00
<1.00
<1.00
1.60
1.78
1.78
1.95
2.30
2.00
2.30
2.45
3.34
3.15
3.18
3.18
6
<1.00
<1.00
<1.00
<1.00
1.78
1.30
2.20
1.78
1.78
1.30
2.34
2.20
3.04
3.11
3.36
3.28
7
<1.00
<1.00
<1.00
<1.00
1.60
1.48
1.70
1.30
2.36
2.20
2.43
2.11
3.18
3.04
3.20
3.11
8
<1.00
<1.00
<1.00
<1.00
1.85
1.90
1.00
1.00
2.43
2.45
2.00
2.08
3.20
3.40
3.00
3.08
9
<1.00
<1.00
<1.00
<1.00
1.30
1.30
1.48
1.00
2.53
2.45
2.56
2.53
3.08
3.00
3.04
3.00
10
<1.00
<1.00
<1.00
<1.00
1.30
1.30
1.30
1.00
2.11
2.38
2.00
2.56
3.26
3.18
3.30
3.04
11
<1.00
<1.00
<1.00
<1.00
1.60
1.30
1.48
1.60
2.15
2.30
1.95
1.90
3.15
3.15
3.15
3.08
12
<1.00
<1.00
<1.00
<1.00
1.70
1.85
1.30
1.00
2.28
2.26
2.00
2.00
3.70
3.34
3.40
3.08
13
<1.00
<1.00
<1.00
<1.00
1.60
1.60
1.48
1.30
2.15
2.28
1.78
1.95
2.78
2.90
2.90
2.95
14
<1.00
<1.00
<1.00
<1.00
1.60
1.70
1.70
1.78
2.53
2.08
2.76
2.08
3.49
3.08
3.40
3.23
15
<1.00
<1.00
<1.00
<1.00
1.78
1.78
1.78
1.85
2.11
2.45
2.45
2.30
3.08
2.70
3.41
3.41
aLog
10
yeast and mold CFU/g.
bFDA BAM and ISO 21257 reference method replicates were enumerated at 5 and 7 days (uninoculated test portions) of incubation at 25
°C.
cA and B = Indicated duplicate test portions.dData not included in statistical analysis for this contamination level.eDouble Grubbs’ outlier.fSingle Grubbs’ outlier.gLaboratory data not included in statistical analysis for all contamination levels.