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Table 30.
3M Petrifilm RYM Method Compared to ISO 21527:2008 part 1 and
1
FDA-BAM Chapter 18 for frozen Ground Beef Patties at 48 and 60
2
Hours.
Reference Method
Level
Replicate
cfu/g log cfu/g cfu/g log cfu/g cfu/g log cfu/g
1
<10
<1
<10
<1
<10
<1
2
<10
<1
<10
<1
<10
<1
3
<10
<1
<10
<1
<10
<1
4
<10
<1
<10
<1
<10
<1
5
<10
<1
<10
<1
<10
<1
Mean
NA
NA
NA
Sr
NA
NA
NA
RSDr, %
NA
NA
NA
p
-value
NA
NA
NA
1
80
1.9
90
1.95
90
1.95
2
100
2.00
100
2.00
60
1.78
3
70
1.85
70
1.85
60
1.78
4
100
2.00
120
2.08
100
2.00
5
70
1.85
100
2.00
80
1.90
Mean
84
1.92
96
1.98
78
1.88
Sr
0.08
0.09
0.10
RSDr, %
4.16
4.55
5.32
p
-value
0.52
0.60
1
960
2.98
1020
3.01
570
2.76
2
810
2.91
870
2.94
510
2.71
3
780
2.89
820
2.91
680
2.83
4
780
2.89
840
2.92
640
2.81
5
780
2.89
870
2.94
600
2.78
Mean
822
2.91
884
2.95
600
2.78
Sr
0.04
0.04
0.05
RSDr, %
1.37
1.36
1.80
p
-value
0.01
0.01
1
7100
3.85
7000
3.85
5400
3.73
2
6300
3.80
6700
3.83
4400
3.64
3
6600
3.82
6900
3.84
4100
3.61
4
5700
3.76
6000
3.78
3700
3.57
5
5900
3.77
6100
3.79
4100
3.61
Mean
6320
3.8
6540
3.81
4340
3.63
Sr
0.04
0.03
0.06
RSDr, %
1.05
0.79
1.65
p
-value
0.00
0.00
High
RYM Method-48h
RYM Method-60h
Uninoculated
LOW
Medium
3
4
40
AOAC Research Institute
Expert Review Panel Use Only
OMAMAN-16D/ PTM Report
ERP Use Only - December 2014