317 / 350
Table 14.
Method Comparison Results for Sour Cream at 48 and 60 Hours.
1
SD
SD
(S
r
)
(S
r
)
1
<10
<0
<10
<0
2
<10
<0
<10
<0
3
<10
<0
<10
<0
4
<10
<0
<10
<0
5
<10
<0
<10
<0
1 8.2x101 1.9138
9.2 x 10
1
1.9638
2
1.0x10
1
1.0000
1.0 x 10
1
1.0000
3
1.0x10
1
1.0000
1.0 x 10
1
1.0000
4
1.0x10
1
1.0000
1.0 x 10
1
1.0000
5
2.0x10
1
1.301
1.0x 10
1
1.0000
1
1.0x10
2
2.0000
5.4 x 10
3
1.8451
2
7.0x10
1
1.8451
2.7 x 10
3
2.0000
3
8.0x10
1
1.9031
3.2 x 10
3
1.9542
4
9.0x10
1
1.9542
5.6 x 10
3
2.0414
5
7.0x10
1
1.8451
4.0 x 10
3
1.9542
1 1.2 x 10
3
3.0792
3.9 x 10
4
3.1761
2 7.5 x 10
2
2.8751
2.6 x 10
4
3.0792
3 1.0 x 10
3
3.0000
4.2 x 10
4
3.1139
4 8.0 x 10
2
2.9031
3.8 x 10
4
3.1461
5 1.3 x 10
3
3.1139
3.4 x 10
4
3.1139
p-value
Ct/g
LOG MEAN
Ct/g
LOG MEAN
Uninoculated
-
-
-
Level
Sample
3MRYMPetrifilm
ISO/FDA BAM
-
NA
Low
1.243 0.397
1.1928 0.431 0.8528
Medium
1.9095 0.0681
1.959 0.0733 0.3007
High
2.9943 0.105
3.1259 0.0367 0.0457
2
3
Almonds 48 and 60 hours
4
No statistically significant difference was observed between 2 of the 3 levels analyzed between the two
5
methods. The p-values calculated at a 95% confidence level for the low and medium levels were 0.1471
6
and 0.0661. The t-test indicated a significant difference between the 3M RYM method and the ISO and
7
FDA BAM methods on the high level with a p-value of 0.0045. The 3M RYM method had a higher
8
repeatability value than the ISO and FDA BAM methods for the low and high levels, with S
r
values,
9
respectively, of 0.0788 and 0.2220 for the low level and 0.0331 and 0.0603 for the high level. For the
10
medium level the ISO and FDA BAM had higher repeatability values compared to the RYM method, with
11
S
r
values, respectively, of 0.0885 and 0.0590. Detailed results are presented in Table 15.
12
13
14
21
AOAC Research Institute
Expert Review Panel Use Only
OMAMAN-16D/ PTM Report
ERP Use Only - December 2014